Visual material based on cephalopodocephalus biological skin discoloration mechanism and preparation method thereof

Abstract

The invention relates to a model based on a head-foot line biological skin discoloration mechanism, which comprises a plurality of model units arranged in an array mode, and each model unit comprises a refraction layer and a pigment information layer; the refraction layer plays a refraction role, and the pigment information layer carries pigment information; the pigment information layer comprises an annular pigment layer, a round hole is formed in the center of the pigment information layer, colors are distributed on the annular pigment layer in a block mode, and a central white cylinder is further arranged at the round hole aligned to the center of the pigment information layer; the top view of an annular pigment layer of the pigment information layer is a circular ring, the circular ring is provided with three pure color blocks which are arranged at intervals, and a mixed transition color block is formed between every two adjacent pure color blocks; the refraction layer is in the shape of a transparent semi-long sphere, the refraction layer covers the whole pigment information layer in the refraction layer and close to the bottom, and the bottom face of the central white cylinder is flush with the bottom of the refraction layer. Based on the model, a full-color 3D printing technology is combined to prepare the cephalopoda biological skin discoloration simulation visual material, and the discoloration efficiency and the impression experience of the visual material are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials, and in particular to a visual illusion material based on the skin color change mechanism of cephalopod organisms and a preparation method thereof. Background Art

[0002] Colors can be divided into structural colors, pigment colors, and combined colors. The mechanisms of these two colors are different, but both can make objects appear in specific colors. Structural colors are colors produced by pure physical structures without any pigment factors. Pigment colors are colors produced based on the absorption or dispersion of light by pigments. Combined colors are biological forms that are a combination of pigment colors and structural colors. Among them, structural colors have many advantages that post-pigment colors do not have. Compared with pigment colors that are easily affected by the environment and change, structural colors are usually composed of simple physical structures. As long as their own physical structure is not destroyed, their colors will not diminish. Structural colors not only have high brightness and high saturation, but also usually have iridescent effects. Structural colors do not rely on chemical substances such as toxic pigments, and are environmentally friendly.

[0003] At present, the preparation methods of single structural color materials can be divided into the following according to the optical principle of structural color: ① Rainbow film, titanium alloy anodized film, color-changing pearlescent powder, electroplating fantasy color, etc. involved in multilayer thin film interference. ② Laser direct writing, photolithography, CNC machining, etc. involved in grating diffraction. ③ Cu2O sphere Mie scattering structural color coloring involved in scattering. ④ Dichroic glass, polarization display, etc. involved in polarized light. ⑤ Photonic crystal structural color fiber, photonic crystal structural color fabric, photonic crystal pigment, 3D printing preparation of graphic photonic crystals, etc. involved in photonic crystals. ⑥ Use natural biological materials to bond structural colors, etc. In order to obtain precise color effects, the preparation of the above-mentioned single structural color materials requires precise control of the microstructure morphology of the material, which not only requires high-precision operation, but also needs to be carried out under extremely stable environmental conditions. During the preparation process, continuous optimization is required to achieve high consistency and repeatability of color, which not only requires high-precision equipment, but also places very high demands on the professional knowledge and practical experience of designers or operators. These factors limit the effective preparation and widespread application of structural color dynamic visual illusion materials, and according to existing technologies, it is difficult to achieve color simulation and color control for specific purposes using currently readily available visual illusion materials.

[0004] Bionic color design is developed on the basis of bionics. It mainly studies the excellent color functions and forms of biological systems in nature to carry out color perception bionics, color information feedback control, etc., and selectively applies these natural principles to artificial color design. Lan Cuiqin, He Shuang and others found in the article "Research on Design Innovation Methods Learning from Nature - Exploration of Digital Biological Design Paths" that leopard chameleons change colors by actively adjusting the guanine nanocrystal lattice in the iris cells of the epidermis and dermis. Based on this inspiration, industry researchers can combine the bottom color information layer with the upper transparent crystal layer (which plays a refractive role) and adjust the crystal structure to obtain the dynamic change effect of color under the influence of light refraction of different crystal structures.

[0005] The color-changing effect of cephalopod skin has a wonderful visual effect. With people's continuous pursuit of quality of life, simulation materials based on the color-changing effect of cephalopod skin have been increasingly loved and paid attention to in the fields of mobile terminals, automobile production, dynamic billboards, interactive art, clothing manufacturing, etc. At the same time, with the development of voxel 3D printing technology, it has provided the possibility of constructing complex three-dimensional structures, promoting the further research and exploration of optical illusion materials and their application. However, how to establish and optimize parameters to obtain a model with the color-changing effect of cephalopod skin is still the first technical problem to be solved. For example, the team of Beijing Institute of Fashion Technology has previously developed a kind of illusion material containing a crystal layer and a pigment information layer, in which the pigment information layer is divided into four quadrants with a cross, and two color blocks of each color (including two color blocks - yellow and purple, located in the diagonal quadrants respectively). However, this distribution setting method has certain effect defects, which are specifically manifested as follows: (1) The color-changing performance is weak, and the specific color-changing performance achieved is only the alternation of two colors. (2) The color blocks are clearly divided, and when the viewing angle changes horizontally, there will be obvious color faults and visual paragraphs. (3) The viewing angle coverage area is limited, which means that relatively complete colors can only be observed at a specific viewing angle and range. When the viewing angle exceeds the effective viewing range (when the viewing angle is close to the top surface and the color boundary), the complete color cannot be fully observed (fragmented blocks of two colors will be seen at the same time), and there is a large visual loophole range.

[0006] In order to effectively solve the above technical problems, the present invention further designs and optimizes the model structure through abstract refinement of the cell structure of the dermis of cephalopods and the color change principle, optimizes and expands the observable range, and improves the color change efficiency and viewing experience of the visual illusion material simulating the skin of cephalopods. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a visual illusion material based on the skin color change mechanism of cephalopod organisms and a preparation method thereof. By building a model based on the skin color change mechanism of cephalopod organisms and optimizing the model structure parameters, a model with the optimal cephalopod skin color change simulation effect is obtained. Cephalopod organism skin simulation material is prepared in combination with Stratasys full-color 3D printing technology, realizing the simulation of the dynamic color of cephalopod organism skin from a macroscopic perspective.

[0009] (II) Technical solution

[0010] In a first aspect, the present invention provides a model based on the skin color change mechanism of cephalopod organisms, comprising: a plurality of model units arranged in an array, each model unit comprising a refraction layer and a pigment information layer; the refraction layer refracts incident light, and the pigment information layer carries pigment information;

[0011] The pigment information layer comprises an annular pigment layer with a circular hole at the center thereof, colors are distributed in the form of blocks on the annular pigment layer, and a central white cylinder is provided at the circular hole aligned with the center of the pigment information layer; the central white cylinder is located below the annular pigment layer and has a spacing with the annular pigment layer, or the central white cylinder is provided in the circular hole of the annular pigment layer; the annular pigment layer of the pigment information layer is a circular ring in a top view, and the circular ring is provided with three mutually spaced pure color blocks, and a mixed transition color block is formed between two adjacent pure color blocks;

[0012] The refractive layer is a continuous transparent medium, which is in the shape of a semi-prolongated sphere with a circular cross section. The refractive layer covers the pigment information layer as a whole inside the refractive layer and close to the bottom, and the bottom surface of the central white cylinder is flush with the bottom of the refractive layer. Preferably, the semi-prolongated sphere is 1 / 2 of the prolongated sphere, and the prolongated sphere is a rotating ellipsoid formed with the major axis of the ellipse as the rotation axis, the major axis of the ellipse is twice the height of the refractive layer, and the minor axis is the diameter of the bottom circle.

[0013] According to a preferred embodiment of the present invention, in the circle formed by the top view of the annular pigment layer, the inner radius of the circle is r, the outer radius of the circle is 2.9r-2.95r, the radius of the central white cylinder is equal to the inner radius of the circle, which is r; the bottom radius of the refractive layer is 3r-3.2r, and the height of the refractive layer is 6.35r-6.5r; the height of the central white cylinder is 0.4-0.6r; wherein r=1-1.2mm.

[0014] According to a preferred embodiment of the present invention, the annular pigment layer of the pigment information layer is a plane ring, which is evenly divided into 6 blocks. The first, third and fifth blocks along the circumferential direction are respectively assigned three basic colors, and the second, fourth and sixth blocks are respectively assigned three gradient transition colors, and the transition colors are gradient transition colors of two adjacent basic colors; the thickness of the plane ring is 0.4r-0.6r; a central white cylinder is arranged below the circular hole of the plane ring, the bottom of the central white cylinder is flush with the bottom of the refractive layer, and there is a spacing of 0.25r-0.32r between the top of the central white cylinder and the bottom of the plane ring.

[0015] According to a preferred embodiment of the present invention, the annular pigment layer is an open stepped ring structure consisting of three congruent sector rings with an arc of 150-180 degrees connected and adjacent sector rings overlapped end to end, and there is a height difference of a sector ring thickness between the top sector ring and the bottom sector ring; the thickness of each sector ring is equal and is 0.9r-1.1r;

[0016] Each sector ring is composed of pigment particles of different sizes, which are cylindrical short rods perpendicular to the bottom surface of the refractive layer. The radius of the pigment particles close to the circular hole is smaller than the radius of the pigment particles close to the edge of the annular pigment layer. The radius of the pigment particles of each sector ring is larger near the midline, and the radius of the pigment particles gradually decreases as it develops to both sides of the midline. Two kinds of mixed pigment particles are randomly mixed at the overlapping part of the two sector rings, and the rest are pure color pigment particles.

[0017] The bottom surfaces of the lower fan ring and the central white cylinder are flush with the bottom surface of the refractive layer, and their pure color pigment particles are dark brown, the pure color pigment particles of the middle fan ring are yellow, and the pure color pigment particles of the upper fan ring are red;

[0018] The overlapping part of the lower fan ring and the middle fan ring is a mixture of dark brown and yellow mixed pigment particles, the overlapping part of the middle fan ring and the upper fan ring is a mixture of yellow and red mixed pigment particles; the overlapping part of the upper fan ring and the lower fan ring is a mixture of dark brown and red mixed pigment particles.

[0019] According to a preferred embodiment of the present invention, the annular pigment layer is an open stepped ring structure composed of six congruent sector rings with an arc of 60 degrees, and adjacent sector rings are arranged upward layer by layer with a thickness of 1 / 2 sector ring, and there is a height difference of 2 sector ring thicknesses between the top sector ring and the bottom sector ring;

[0020] Counting along the circumferential direction, the first, third and fifth sector rings are respectively assigned three basic colors, the second, fourth and sixth sector rings are respectively assigned three transition colors, which are mixed transition colors of two adjacent basic colors; the bottom surfaces of the first sector ring and the central white cylinder are flush with the bottom surface of the refractive layer; the thickness of each sector ring is equal and is 0.4r-0.6r.

[0021] The above-mentioned "open step ring structure" means that the bottom fan ring and the top fan ring are not connected, and its step ring structure is a non-closed loop mode, which is different from the "closed step ring structure" described below.

[0022] According to a preferred embodiment of the present invention, the annular pigment layer is a closed-loop stepped ring structure composed of six congruent sector rings with an arc of 60 degrees, the first to fourth sector rings along the circumferential direction are arranged upward layer by layer with a thickness of 1 / 2 sector ring, and the fourth to sixth sector rings are arranged downward layer by layer with a thickness of 1 / 2 sector ring, so that the sixth sector ring is connected to the first sector ring in a manner of being 1 / 2 sector ring thickness higher than the first sector ring; the first, third and fifth sector rings along the circumferential direction are respectively assigned three basic colors, the second, fourth and sixth sector rings are respectively assigned three transition colors, and the transition colors are mixed transition colors of two adjacent basic colors; the bottom surfaces of the first sector ring and the central white cylinder are flush with the bottom surface of the refractive layer; the thickness of each sector ring is equal and is 0.4r-0.6r.

[0023] According to a preferred embodiment of the present invention, the annular pigment layer is a three-dimensional ring, which is obtained by processing the height difference between two adjacent fan rings in a closed-loop stepped ring structure into a gentle slope and then further processing it into a continuous and smooth curved surface; the three-dimensional ring is evenly divided into 6 blocks, the first, third and fifth blocks along the circumferential direction are respectively assigned three basic colors, the second, fourth and sixth blocks are respectively assigned three gradient transition colors, and the transition colors are gradient transition colors of two adjacent basic colors; an angle is formed between the three-dimensional ring and the bottom surface of the refractive layer; the lowest position of the bottom surface of the three-dimensional ring and the bottom surface of the central white cylinder are flush with the bottom surface of the refractive layer, and the thickness of the three-dimensional ring is 0.6r-0.75r.

[0024] The size of the model unit reaches a macroscopic size, which can simulate the color change effect of cephalopod skin from a macroscopic perspective. The aforementioned model unit can ensure that the visual illusion material printed by Stratasys in full-color 3D has a good angle color change effect and color smoothness. In practical applications, the size of the entire model unit can be scaled from 2.0mm to several centimeters according to demand while maintaining the thickness of the pigment information layer and the central white cylinder ≥0.4mm. However, when the entire model unit is reduced to a bottom diameter of less than 1.1mm, the color change effect of the visual illusion material may deteriorate due to insufficient printing accuracy.

[0025] In a second aspect, the present invention provides a method for preparing a visual illusion material based on the skin color change mechanism of cephalopod organisms, which comprises the following steps:

[0026] Modeling is performed according to the model based on the skin color change mechanism of cephalopod organisms as described in any of the above embodiments; then, the Stratasys full-color 3D printing technology is used to print the pigment information layer with a colored photosensitive polymer material, and the refractive layer with a transparent photosensitive polymer material; after printing, it is cured under UV light to obtain the visual illusion material based on the skin color change mechanism of cephalopod organisms.

[0027] Wherein, the refractive index of the transparent photosensitive polymer material is preferably 1.5-1.8.

[0028] In a third aspect, the present invention provides a visual illusion material based on the skin color change mechanism of cephalopod organisms, which is prepared by the above-mentioned preparation method.

[0029] (III) Beneficial effects

[0030] The present invention constructs a model based on the skin color change mechanism of cephalopod organisms, combines the Stratasys full-color 3D printing technology to prepare a visual illusion material that simulates the skin color change effect of cephalopod organisms, and realizes the simulation of the skin color change characteristics of cephalopod organisms from a macroscopic perspective.

[0031] The unique convex structure of the refractive layer in the model structure of the present invention can effectively expand the refracted and amplified light reflected by the color of the pigment information layer. The central white cylinder at the bottom center of the pigment information layer is an abstract bionics of the leukocytes in the dermis of cephalopods, which is very different from the previous model structure design. The light reflected by the central white cylinder can be effectively presented in a larger range at the top of the crystal through refraction. When observed from the top perspective, the central color block (white cylinder) at the bottom of the refractive layer can be fully observed without interference from other colors, forming a complete color effect; the central white cylinder can effectively broaden the effective angle range of the visual illusion material observation angle.

[0032] The present invention continuously optimizes the annular pigment layer of the pigment information layer, simplifies the structure of the model unit, reduces the technical difficulty of preparing the visual illusion material, and reduces the material cost consumption. The present invention uses photosensitive materials and Stratasys 3D inkjet voxel printing technology for printing, thereby using easily available and inexpensive materials to prepare a new material that simulates the dynamic color of the skin of cephalopod organisms.

[0033] Stratasys 3D inkjet voxel printing technology upgrades the two-dimensional "pixel" printing logic to the three-dimensional "voxel" production logic. The photosensitive resin is sprayed onto the base material such as cloth in the form of inkjet by the nozzle moving back and forth, and then cured by UV lamp to achieve fast and accurate one-piece printing production. This technology breaks the traditional photosensitive resin immersion printing method and adopts the logic of inkjet curing additive manufacturing, so that resins with different material properties can be made and molded in one printing task. This technology can not only ensure the accuracy and efficiency of production, but also maximize the restoration and color accuracy. Stratasys 3D printers also have highly transparent transparent resin materials (refractive index between 1.5-1.8) and an extremely rich color material library. These characteristics of Stratasys 3D printing technology provide all the necessary elements and realization possibilities for the preparation of the new visual illusion material of the present invention, and also provide greater extension space for the design deduction of the model.

[0034] The model unit size of the present invention is about (3-3.2) mm × (6.35-6.5) mm. The printing is performed within the model unit size range, and the microstructure morphology of the material does not need to be precisely controlled. The operation precision requirement is low. Compared with the current preparation technology of single structural color materials, the present invention prepares the visual illusion material based on the skin color change mechanism of cephalopod organisms, and does not need to be carried out under extremely stable environmental conditions. The preparation process is simple and easy to control, and the repeatability and consistency are high. Through the technology of the present invention, the cephalopod organism skin color change simulation material can be further promoted and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a model unit in the model based on the skin color change mechanism of cephalopod organisms constructed in Example 1.

[0036] Figure 2 Based on Figure 1 The constructed model was created using a photo of a visual illusion material produced using Stratasys full-color 3D printing.

[0037] Figure 3 This is a schematic diagram of the structure of a model unit in the model based on the skin color change mechanism of cephalopod organisms constructed in Example 2.

[0038] Figure 4 This is a schematic diagram of the structure of a model unit in the model based on the skin color change mechanism of cephalopod organisms constructed in Example 3.

[0039] Figure 5 Based on Figure 4 The constructed model was created using a photo of a visual illusion material produced using Stratasys full-color 3D printing.

[0040] Figure 6 This is a schematic diagram of the structure of a model unit in the model based on the skin color change mechanism of cephalopod organisms constructed in Example 4.

[0041] Figure 7 Based on Figure 6 The constructed model was created using a photo of a visual illusion material produced using Stratasys full-color 3D printing.

[0042] Figure 8 This is a schematic diagram of the structure of a model unit in the model based on the skin color change mechanism of cephalopod organisms constructed in Example 5.

[0043] Fig. 9 Based on Figure 8 The constructed model was created using a photo of a visual illusion material produced using Stratasys full-color 3D printing.

[0044] Fig.10 This is the effect of slightly lengthening the height of the central white cylinder 22 of the model unit of Example 3. DETAILED DESCRIPTION

[0045] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0046] Example 1

[0047] This embodiment constructs a model based on the skin color change mechanism of cephalopod organisms, which is a plurality of model units arranged in an array, each model unit comprising a refractive layer 1 and a pigment information layer 2; the refractive layer 1 refracts incident light, and the pigment information layer 2 is used to carry pigment information.

[0048] like Figure 1The side view (see Figure a), top view (see Figure b) and stereogram (see Figure c) of the model unit of Example 1 are shown. The refractive layer 1 is a continuous transparent medium (without bubbles or voids), which is used to simulate the transparent cells in the skin of chameleons. These cells have special refractive and reflective properties. The overall shape of the refractive layer 1 is a semi-prolate spheroid (Prolate Spheroid: when the rotation axis is the major axis of the ellipse, the rotation ellipsoid formed is a prolate spheroid) with a circular cross-section, which is similar to a dome and covers the pigment information layer 2 and wraps the entire pigment information layer 2. The pigment information layer 2 is responsible for providing rich color changes. The refractive layer 1 can cause specific refraction and reflection of light when passing through the refractive layer, thereby creating an optical effect similar to the upper layer of chameleon skin and realizing dynamic color changes. The pigment information layer 2 consists of an annular pigment layer 21 and a central white cylinder 22 aligned with the circular hole 210 in the middle of the annular pigment layer 21. When light passes through the upper transparent refractive layer 1 and hits the pigment information layer 2 and is reflected, these colors are mapped out at a specific angle, forming a stunning color effect. The refractive index of the refractive layer 1 is between 1.5 and 1.8.

[0049] In the present embodiment, the annular pigment layer 21 is set as a plane ring, with a circular hole 210 at the center, and the plane ring is divided into 6 sector ring blocks. The first, third and fifth blocks along the circumferential direction are respectively assigned three basic colors, and the second, fourth and sixth blocks are respectively assigned three transition colors, and the transition colors are mixed transition colors of two adjacent basic colors. In the present embodiment, the first, third and fifth blocks are respectively assigned red, yellow and black, and the second, fourth and sixth blocks are respectively assigned red-yellow mixed transition colors, yellow-black mixed transition colors and black-red mixed transition colors. Among them, the three basic colors of red, yellow and black correspond to the colors of the three pigment cells in the dermis of cephalopod organisms, respectively, and the two adjacent basic colors are fused and mixed to form the transition color between them, which corresponds to the mixed color effect produced by the pigment cells of cephalopod organisms after the area changes. The central white cylinder 22 below the annular pigment layer 21 is a bionic simulation of the white body cells at the bottom of the dermis of cephalopods. Its function is to effectively and comprehensively reflect the light incident from the top (the incident light at an angle of 90±10° to the bottom surface), so that the model can present a better complete color effect when viewed from above.

[0050] The three mixed transition colors formed on the annular pigment layer 21 fundamentally solve the problem of color transition segmentation (discontinuity of color transition) that occurs in existing visual illusion materials as the viewing angle changes, thereby improving the softness and smoothness of the viewing experience while widening the viewing angle range.

[0051] The radius of the circular hole 210 of the annular pigment layer 21 is r, the radius of the plane circular ring is 2.9r-2.95r, and the thickness is 0.4-0.6r. The radius of the central white cylinder 22 is equal to the circular hole 210, and the height is 0.4-0.6r. The bottom radius of the refractive layer 1 is larger than the annular pigment layer 21, which can be set to 3-3.2r and larger than the outer radius of the annular pigment layer 21. The height of the refractive layer 1 is 6.35r-6.5r, so that the entire annular pigment layer 21 and the central white cylinder 22 are easily covered at the bottom surface thereof. Among them, the bottom of the central white cylinder 22 is flush with the bottom surface of the refractive layer 1, and there is a spacing between the top surface of the central white cylinder 22 and the plane circular ring, and the spacing is 0.25-0.32r. The central white cylinder 22 can effectively block and integrate the pigment color on the plane circular ring when the viewing angle changes. In this embodiment, when observed from a top view, the annular pigment layer 21 and the central white cylinder 22 do not block each other, and the annular pigment layer 21 and the colored fan-ring blocks on its surface 6 and the central white cylinder 22 can be seen.

[0052] The spacing between the top surface of the central white cylinder 22 and the flat ring allows the surrounding annular pigment layers 21 to surround the central white cylinder 22 and form a three-dimensional stacked structure with a certain height difference. This height difference causes the colorful annular pigment layers 21 to stack and block the central white cylinder 22 in the center, which helps to reduce the confusing visual effect caused by seeing the central white cylinder 22 in the center when observing from the side, thereby improving the complete sensory experience of visual observation.

[0053] When the incident light enters, it reaches the different sector ring blocks of the lower pigment information layer 2 after being transmitted and refracted by the upper transparent refractive layer 1. The pigment information layer 2 absorbs and reflects the incident light according to the set color type, and finally the reflected light is reflected through the refractive layer 1 to form a visual presentation of color. By utilizing the specific structure of the above-mentioned model unit and combining the array changes of the model unit, different wonderful visual effects can be created. Among them, the refractive index and shape of the refractive layer 1 and the arrangement of blocks of different colors in the pigment information layer 2 directly affect the observation effect.

[0054] The structure of the model unit in the model of this embodiment is compared experimentally, and it has the best simulation effect of skin discoloration of cephalopod organisms in various embodiments. It is the most concise model structure, the easiest to prepare with new materials through voxel 3D printing, and the one that saves material costs.

[0055] The radius r of the circular hole 210 of the annular pigment layer 21 can be 0.95-1.1 mm. When r=1 mm, the outer radius of the annular pigment layer 21 is 2.95 mm, the thickness of the plane ring is 0.5 mm, the radius of the central white cylinder 22 is 1 mm, the height is 0.5 mm, and there is a height gap of 0.25 mm between the top surface of the central white cylinder 22 and the bottom surface of the plane ring. The bottom radius of the refractive layer 1 is 3.0 mm, and the height is 6.35 mm. Since the refractive layer 1 is a semi-prolongated sphere, that is, the prolongated sphere is a rotating ellipsoid formed with the major axis of the ellipse as the rotation axis, the major axis of the ellipse is 12.7 mm (6.35 mm×2), and the minor axis is 6.0 mm (3.0 mm×2).

[0056] The model units were constructed according to the above specifications and formed into an array to obtain a model for preparing the visual illusion material. The Stratasys full-color 3D printing technology was used to print the annular pigment layer 21 and the central white cylinder 22 in the pigment information layer 2 with a colored photosensitive polymer material, and the refractive layer 1 was printed with a transparent photosensitive polymer material with a refractive index of 1.56. After the 3D printing was completed, it was irradiated under 500W UV light for 3 minutes to cure and fix, and the visual illusion material based on the skin color change mechanism of cephalopod organisms was obtained. The solid photo of the prepared visual illusion material is shown in Figure 2 shown.

[0057] The visual illusion material prepared by the model of Example 1 has a delicate and wide color range and smooth color transition performance: when the viewing angle changes in the horizontal direction, the observed color also changes delicately. Figure 2 In (a), (b), and (c), observations are made at three different diagonals of the model unit array, and the observation angle is 50° longitudinal inclination (the angle between the observation line and the horizontal line). Different color changes can be seen in different observation directions; (d) is the visual effect when the longitudinal inclination of the observation angle is 90° (i.e., the top view), and it can be found that the color of the model units has all turned white (all showing the color of the central white cylinder). Compared with other embodiments, the model designed in this embodiment is the most streamlined model structure for preparing visual illusion materials and realizing visual illusion effects, and has the characteristics of saving material costs and the most delicate color rendering.

[0058] Example 2

[0059] The model constructed in this embodiment is different from that in the embodiment 1. The main difference is that the pigment information layer 2 still includes an annular pigment layer 21 and a central white cylinder 22. The difference is that Figure 3The side view (see Figure a), top view (see Figure b) and stereogram (see Figure c) of the model unit of Example 2 are shown. In this embodiment, the annular pigment layer 21 is an open stepped ring structure composed of three congruent fan rings with an arc of 150-180 degrees connected and adjacent fan rings overlapped end to end. The middle fan ring 212 is between the top fan ring 213 and the bottom fan ring 211. Each fan ring is horizontally arranged, and its thickness is equal and is 0.9r-1.1r. The horizontal heights of the three fan rings 211, 212, and 213 are successively increased by 1 fan ring thickness. The arcs of the three fan rings 211, 212, and 213 are 180 degrees respectively, of which the two ends overlap 60 degrees, and the remaining unoverlapped arc is also 60 degrees, so that the entire stepped ring structure can be divided into 6 fan ring blocks.

[0060] The three sector rings 211, 212, and 213 are respectively formed by the aggregation of pigment particles of different sizes. These pigment particles are actually short cylindrical rods perpendicular to the bottom surface of the refractive layer. The radius of the pigment particles near the circular hole 210 is smaller, while the radius of the pigment particles near the edge of the annular pigment layer 21 is larger. The radius of the pigment particles of each sector ring is larger near the midline, and the radius of the pigment particles gradually decreases as it develops to both sides of the midline. Two mixed pigment particles are randomly mixed at the overlapping part of two adjacent sector rings, and the rest of the parts are pure color pigment particles.

[0061] like Figure 3 As shown, the bottom surfaces of the lower fan ring 211 and the central white cylinder 22 are flush with the bottom surface of the refractive layer 1, and the pure color pigment particles are dark brown, the pure color pigment particles of the middle fan ring 212 are yellow, and the pure color pigment particles of the upper fan ring 213 are red. The overlapping part of the lower fan ring 211 and the middle fan ring 212 is mixed with dark brown and yellow mixed pigment particles, the overlapping part of the middle fan ring 212 and the upper fan ring 213 is mixed with yellow and red mixed pigment particles, and the overlapping part of the upper fan ring 213 and the lower fan ring 211 is mixed with dark brown and red mixed pigment particles. Among them, the dark brown pigment particles, the dark brown and yellow mixed pigment particles, the yellow pigment particles, the yellow and red mixed pigment particles, the red pigment particles, and the dark brown and red mixed pigment particles respectively occupy an arc of 60 degrees in the annular pigment layer 21.

[0062] This embodiment is a relatively intuitive simulation of the principle of skin color change of cephalopod organisms. The three-layer fan ring 211, 212, and 213 are constructed based on the three layers of pigment cells in the skin of cephalopod organisms, and the three pure color pigment particles are corresponding simulations of the color of the pigment cells of cephalopod organisms. Since the horizontal heights of the three fan rings 211, 212, and 213 are successively increased by the thickness of one fan ring to form a step shape, there is a height difference between the three fan rings, and the fan rings of different heights have different shielding effects on the central white cylinder 22, which helps to cleverly adjust the visible area of ​​the central white cylinder 22. The pigment particles of different radius sizes in each of the three fan rings 211, 212, and 213 simulate the state of the pigment cells of the skin of cephalopod organisms during the color change process. In this embodiment, the pigment particles with a large radius simulate the stretched state of the pigment cells of the skin of cephalopod organisms, and the pigment particles with a small radius simulate the contracted state of the pigment cells of the skin of cephalopod organisms. At the same time, there is a mixture of two pigment particles in the overlapping parts, which is a simulation of the color mixing effect of pigment cells. The irregular random mixing of pigment particles of different colors can present a natural color mixing effect at the macro level. Due to the inkjet principle of inkjet voxel 3D printing technology, the preparation process of the illusion material forms a natural color mixing and presents a macroscopic visual effect of six color blocks.

[0063] According to the above-mentioned dimensions of r=1mm and the thickness of the three fan rings of 1mm, the model units were constructed and arrayed to obtain a model for preparing the visual illusion material. The Stratasys full-color 3D printing technology was used to print the annular pigment layer 21 and the central white cylinder 22 in the pigment information layer 2 with a colored photosensitive polymer material, and the refractive layer 1 was printed with a transparent photosensitive polymer material with a refractive index of 1.56. After the 3D printing was completed, it was irradiated under 500W UV light for 3 minutes to cure and fix, and the visual illusion material based on the skin color change mechanism of cephalopod organisms was obtained.

[0064] The physical photograph of the illusory material prepared by the model of Example 2 is similar to that of Example 5, and the color transition is clearer and the staged changes are obvious.

[0065] Example 3

[0066] The model constructed in this embodiment is different from that in the embodiment 1. The main difference is that the pigment information layer 2 still includes an annular pigment layer 21 and a central white cylinder 22. The difference is that Figure 4The side view (see Figure a), top view (see Figure b) and stereogram (see Figure c) of the model unit of Example 3 are shown. In this embodiment, the annular pigment layer 21 is an open stepped ring structure composed of six congruent sector rings with an arc of 60 degrees. The adjacent sector rings are arranged upward layer by layer with a height of 1 / 2 sector ring thickness (i.e. 0.25r). There is a height difference of 2 sector ring thicknesses (1.0r) between the top sector ring and the bottom sector ring. The first, third and fifth sector rings along the circumferential direction are respectively given three basic colors, and the second, fourth and sixth sector rings are respectively given three transition colors, and the transition colors are mixed transition colors of two adjacent basic colors. For example, in this embodiment, the first, third and fifth sector rings are respectively given dark brown, yellow and red, and the second, fourth and sixth sector rings are respectively given khaki, orange and dark red. The bottom surfaces of the first sector ring and the central white cylinder are flush with the bottom surface of the refractive layer. The radius of the circular hole 210 of the annular pigment layer 21 is r, the outer radius of the annular pigment layer 21 is 2.95r, and the thickness of each sector ring is equal, which is 0.5r. Among them, r is preferably 1.0 mm.

[0067] This embodiment is a secondary abstract refinement based on Embodiment 2. The annular pigment layer 21 has a 6-layer fan ring structure, and these fan rings are respectively given three basic colors and three mixed transition colors. The basic colors are designed accordingly based on the three layers of pigment cells in the skin of cephalopods, and the mixed transition colors are the fusion effect of adjacent basic colors. The color settings of the six color blocks are very close to the macroscopic visual effects of the six color blocks presented in Embodiment 2. In this embodiment, the six fan rings of the annular pigment layer 21 do not block each other from the central white cylinder, and all parts of the pigment information layer 2 can be seen from the top surface.

[0068] According to the above-mentioned model units, an array is formed to obtain a model for preparing a visual illusion material. The Stratasys full-color 3D printing technology is used to print the annular pigment layer 21 and the central white cylinder 22 in the pigment information layer 2 with a colored photosensitive polymer material, and the refractive layer 1 is printed with a transparent photosensitive polymer material with a refractive index of 1.56. After the 3D printing is completed, it is irradiated under 500W UV light for 3 minutes to cure and fix, and a visual illusion material based on the skin color change mechanism of cephalopod organisms is obtained. The physical photo of the prepared visual illusion material is shown in Figure 5 shown.

[0069] The visual illusion material prepared by the model of Example 3 has a relatively detailed and clear color range, and a clear color transition performance: when the viewing angle changes in the horizontal direction, the observed color also undergoes a clear stage-by-stage change. Figure 5(a), (b), and (c) are all observed at the diagonal angle of the model unit array, and the viewing angle is 50° longitudinal inclination (the angle between the observation line of sight and the horizontal line). It can be seen that different color changes occur at different viewing directions; when the viewing angle is 90° longitudinal inclination (longitudinal top-down viewing angle), the observed color changes to white (the color of the central white cylinder), and the actual effect is similar to that of the above-mentioned embodiment 1. Figure 2 The effect of (d) is basically the same.

[0070] Example 4

[0071] The model constructed in this embodiment is different from that in the embodiment 1. The main difference is that the pigment information layer 2 still includes an annular pigment layer 21 and a central white cylinder 22. The difference is that Figure 6 The side view (see Figure a), top view (see Figure b) and stereogram (see Figure c) of the model unit of Example 4 are shown. In this embodiment, the annular pigment layer 21 is a closed-loop step ring structure composed of six congruent sector rings with an arc of 60 degrees. The first to fourth sector rings counted along the circumferential direction are arranged upward layer by layer with a thickness of 1 / 2 sector ring, but the fourth to sixth sector rings are arranged downward layer by layer with a thickness of 1 / 2 sector ring, so that the sixth sector ring is higher than the first sector ring by 1 / 2 sector ring thickness, and the tail end of the sixth sector ring is connected to the starting end of the first sector ring.

[0072] The first, third and fifth sector rings along the circumferential direction are respectively assigned three basic colors, and the second, fourth and sixth sector rings are respectively assigned three transition colors, and the transition colors are mixed transition colors of two adjacent basic colors. For example, in the present embodiment, the first, third and fifth sector rings are respectively assigned dark brown, yellow and red, and the second, fourth and sixth sector rings are respectively assigned khaki, orange and dark red. The bottom surfaces of the first sector ring and the central white cylinder are both flush with the bottom surface of the refractive layer. The radius of the circular hole 210 of the annular pigment layer 21 is r, and the outer radius of the annular pigment layer 21 is 2.95r. The thickness of each sector ring is equal, which is 0.5r. Among them, r is preferably 1.0mm.

[0073] This embodiment is an improved model after structural optimization based on Example 3. The annular pigment layer 21 has a 6-layer fan-ring structure, and these fan-rings are respectively given three basic colors and three mixed transition colors. The basic colors are designed accordingly based on the three layers of pigment cells in the skin of cephalopods, and the mixed transition colors are the fusion effect of adjacent basic colors. Different from Example 2 or Example 3, the annular pigment layer 21 in this embodiment is a closed-loop structure. Therefore, compared with Example 3, this embodiment can increase visual continuity, and the visual perception is not affected while making the overall module shape more beautiful. In this embodiment, all parts of the pigment information layer 2 can be seen by observing the top surface.

[0074] According to the above-mentioned model units, an array is formed to obtain a model for preparing a visual illusion material. The Stratasys full-color 3D printing technology is used to print the annular pigment layer 21 and the central white cylinder 22 in the pigment information layer 2 with a colored photosensitive polymer material, and the refractive layer 1 is printed with a transparent photosensitive polymer material with a refractive index of 1.56. After the 3D printing is completed, it is irradiated under 500W UV light for 3 minutes to cure and fix, and a visual illusion material based on the skin color change mechanism of cephalopod organisms is obtained. The physical photo of the prepared visual illusion material is shown in Figure 7 shown.

[0075] The visual illusion material prepared according to the model of Example 4 has a more detailed and clear color range and clear color change performance, and the color change performance is very close to that of Example 3. Figure 7 (a), (b), and (c) are all observed at the diagonal angle of the model unit array, and the longitudinal inclination angle is 50° as the observation angle. It can be seen that different color changes can be observed at different observation angles; when the observation angle is 90° longitudinal inclination angle (longitudinal top view angle), the observed color changes to white (the color of the central white cylinder), and the actual effect is the same as that of the above embodiment 1. Figure 2 The effect of (d) is consistent.

[0076] Example 5

[0077] The model constructed in this embodiment is different from that in the embodiment 1, and the main difference is that the pigment information layer 2 still includes an annular pigment layer 21 and a central white cylinder 22. The difference is that, as shown in the side view (see Figure a), top view (see Figure b) and stereogram (see Figure c) of the model unit of the embodiment 5 shown in Figure 8, the annular pigment layer 21 in this embodiment is a three-dimensional ring, which is obtained by processing the height difference between two adjacent fan rings in the closed-loop step ring structure of the annular pigment layer 21 in the embodiment 4 into a gentle slope, and then further processing it into a continuous and smooth curved surface. An angle is formed between the three-dimensional ring and the bottom surface of the refractive layer, but the surface of the three-dimensional ring is not a standard inclined plane. Among them, the lowest position of the bottom surface of the three-dimensional ring and the bottom surface of the central white cylinder are flush with the bottom surface of the refractive layer, and the thickness of the three-dimensional ring is 0.6r-0.75r, r is preferably 1mm, and the thickness of the three-dimensional ring is preferably 0.6mm.

[0078] This embodiment is an improved model after structural optimization based on embodiment 4. Different from embodiment 4, this embodiment improves the closed-loop step ring structure of the annular pigment layer 21 in embodiment 4 into a smooth curved surface, which can be regarded as an abstract refinement of the "closed-loop step ring structure".

[0079] The difference between this embodiment and embodiments 2-4 is that embodiment 1 and this embodiment fill the gradient transition color between the two basic colors. In this embodiment, the three-dimensional ring is divided into 6 blocks, which are red, red-yellow gradient transition color, yellow, yellow-black gradient transition color, black, and black-red gradient transition color. In this way, the sense of paragraphs and the unsmoothness of the color transition can be minimized to the greatest extent, so that the visual illusion material prepared according to the model changes with the observation angle, and the color transition is very smooth and coherent. At the same time, the same as embodiment 1, the integrity of the pigment information layer 2 improves the appearance of the model while reducing the technical difficulty of preparing the angle-changing color material and reducing material consumption.

[0080] According to the above-mentioned model units, an array is formed to obtain a model for preparing a visual illusion material. The Stratasys full-color 3D printing technology is used to print the annular pigment layer 21 and the central white cylinder 22 in the pigment information layer 2 with a colored photosensitive polymer material, and the refractive layer 1 is printed with a transparent photosensitive polymer material with a refractive index of 1.56. After the 3D printing is completed, it is irradiated under 500W UV light for 3 minutes to cure and fix, and a visual illusion material based on the skin color change mechanism of cephalopod organisms is obtained. The physical photo of the prepared visual illusion material is shown in Fig. 9 shown.

[0081] The visual illusion material prepared by the model of Example 5 has a delicate and wide color range and smooth color transition performance. The color change performance is very close to that of Example 1, and the yellow and red purity effects are the best. Fig. 9 As shown in (a), (b), and (c), the observation is made at the diagonal angle of the model unit array, and the observation angle is 50° longitudinally. It can be seen that the observation vision is different and the different color changes are observed. When the observation angle is 90° longitudinally (vertical top view), the observed color changes to white (the color of the central white cylinder). The actual effect is the same as that of the above-mentioned embodiment 1. Figure 2 The effect of (d) is consistent.

[0082] In summary, unlike the existing cephalopod skin model, the visual illusion material model of the present invention includes a prolate spheroid refractive layer, the outer contour of the refractive layer has a smooth curvature change, and the structure of the pigment information layer is optimized, and a neutral white cylinder is added. Based on the construction of the model and the verification of the ray tracing rendering engine, the model unit of the present invention can make the material have an excellent visual illusion color change effect, and each embodiment can well simulate the effect of the color change of the cephalopod skin, effectively solving the problems existing in the perception of the visual illusion material and improving the hue scale range of the color change.

[0083] Among them, by changing the observation angle, Examples 3-4 can achieve switching between 6 colors; and the three-dimensional rings, pigment particle aggregation rings and plane rings of Examples 1, 2 and 5 have softer color visual transitions and no visual perception of broken color blocks, achieving a more detailed and rich color change effect. The actual effect is that the naked eye can observe a natural transition color change effect between 8 to 10 colors (theoretically countless colors).

[0084] In addition, the scheme of the present invention also significantly expands the observation angle range of the visual illusion material, which enables the visual illusion material simulating the color change effect of the skin of cephalopods to achieve the function of presenting complete colors from the top surface perspective that existing similar visual illusion materials cannot obtain. At the same time, the present invention also expands the angle range in which the color can be fully observed, and the overall angle expansion rate of the viewing angle is about 40%.

[0085] The present invention provides a model based on the color change mechanism of the skin of cephalopod organisms and a method for preparing a visual illusion material based on the model. When the curvature, height, radius, etc. of the refractive layer 1 are similar to but not completely consistent with those in the above-mentioned embodiments, the color change effect of the prepared visual illusion material will be weakened but a less complete color change effect can still be achieved. The type and quantity of the pigments assigned to the annular pigment layer 21 can be replaced to obtain different color change effects; and the thickness, radius, number of three-dimensionally distributed layers, and stacking method of the annular pigment layer 21 can be slightly adjusted to achieve similar color change effects. The central white cylinder 22 located at the bottom of the pigment information layer 2 is also variable, and the central white cylinder 22 includes a small adjustment of the radius, thickness, and longitudinal position; for example, when the position of the central white cylinder 22 is displaced up and down by a short distance or the height is slightly elongated (such as Fig.10 As shown), the visual illusion color change effect will produce a slight change, but generally a similar visual illusion effect can still be achieved. In Examples 3-5 of the present invention, all are models obtained by the inventor after optimization processing. The models of these embodiments make the bottom layer of the annular pigment layer 21 and the central white cylinder 22 in the same layer, thereby achieving a clear and definite top visual effect while improving the simplicity of the shape, achieving the technical effects of reducing the difficulty of production and reducing the material consumption in the production process.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. These modifications or replacements, or the technical features in the above embodiments may be combined in the manner described in the embodiments if they do not conflict with each other, and these modifications, replacements or combinations do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A model based on the skin discoloration mechanism of cephalopods, characterized in that: include: A plurality of model units arranged in an array, each model unit comprising a refraction layer and a pigment information layer; The refraction layer refracts the incident light, and the pigment information layer carries the pigment information; The pigment information layer comprises an annular pigment layer with a circular hole at the center thereof, colors are distributed in the form of blocks on the annular pigment layer, and a central white cylinder is provided at the circular hole aligned with the center of the pigment information layer; the central white cylinder is located below the annular pigment layer and has a spacing with the annular pigment layer, or the central white cylinder is provided in the circular hole of the annular pigment layer; The annular pigment layer of the pigment information layer is a circular ring in top view, and the circular ring is provided with three mutually spaced pure color blocks, and a mixed transition color block is formed between two adjacent pure color blocks; The refractive layer is a continuous transparent medium in the shape of a semi-prolongated sphere with a circular cross section. The refractive layer covers the pigment information layer as a whole inside the refractive layer and close to the bottom. The bottom surface of the central white cylinder is flush with the bottom of the refractive layer.

2. The model according to claim 1, characterized in that In the circle formed by the top view of the annular pigment layer, the inner radius of the circle is r, the outer radius of the circle is 2.9r-2.95r, the radius of the central white cylinder is equal to the inner radius of the circle, which is r; the bottom radius of the refractive layer is 3r-3.2r, the height of the refractive layer is 6.35r-6.5r; the height of the central white cylinder is 0.4-0.6r; wherein r=1-1.2mm.

3. The model according to claim 2, characterized in that The annular pigment layer of the pigment information layer is a plane ring, which is evenly divided into 6 blocks. The first, third and fifth blocks along the circumferential direction are respectively given three basic colors, and the second, fourth and sixth blocks are respectively given three gradient transition colors, and the transition colors are gradient transition colors of two adjacent basic colors; the thickness of the plane ring is 0.4r-0.6r; a central white cylinder is arranged below the circular hole of the plane ring, the bottom of the central white cylinder is flush with the bottom of the refractive layer, and there is a spacing of 0.25r-0.32r between the top of the central white cylinder and the bottom of the plane ring.

4. The model according to claim 2, characterized in that The annular pigment layer is an open stepped ring structure consisting of three congruent sector rings with an arc of 150-180 degrees connected and adjacent sector rings overlapped end to end, and there is a height difference of a sector ring thickness between the top sector ring and the bottom sector ring; the thickness of each sector ring is equal and is 0.9r-1.1r; Each sector ring is composed of pigment particles of different sizes, which are cylindrical short rods perpendicular to the bottom surface of the refractive layer. The radius of the pigment particles close to the circular hole is smaller than the radius of the pigment particles close to the edge of the annular pigment layer. The radius of the pigment particles of each sector ring is larger near the midline, and the radius of the pigment particles gradually decreases as it develops to both sides of the midline. Two kinds of mixed pigment particles are randomly mixed at the overlapping part of the two sector rings, and the rest are pure color pigment particles. The bottom surfaces of the lower fan ring and the central white cylinder are flush with the bottom surface of the refractive layer. The pure color pigment particles of the lower fan ring are dark brown, the pure color pigment particles of the middle fan ring are yellow, and the pure color pigment particles of the upper fan ring are red. The overlapping part of the lower fan ring and the middle fan ring is a mixture of dark brown and yellow mixed pigment particles, the overlapping part of the middle fan ring and the upper fan ring is a mixture of yellow and red mixed pigment particles; the overlapping part of the upper fan ring and the lower fan ring is a mixture of dark brown and red mixed pigment particles.

5. The model according to claim 2, characterized in that The annular pigment layer is an open stepped ring structure composed of six congruent sector rings with an arc of 60 degrees, and the adjacent sector rings are arranged upward layer by layer with a thickness of 1 / 2 sector ring, and there is a height difference of 2 sector ring thicknesses between the top sector ring and the bottom sector ring; The first, third and fifth sector rings along the circumferential direction are respectively assigned three basic colors, the second, fourth and sixth sector rings are respectively assigned three transition colors, which are mixed transition colors of two adjacent basic colors; the bottom surfaces of the first sector ring and the central white cylinder are flush with the bottom surface of the refractive layer; the thickness of each sector ring is equal and is 0.4r-0.6r.

6. The model according to claim 2, characterized in that The annular pigment layer is a closed-loop stepped ring structure composed of six congruent sector rings with an arc of 60 degrees. The first to fourth sector rings along the circumferential direction are arranged upward layer by layer with a thickness of 1 / 2 sector ring, and the fourth to sixth sector rings are arranged downward layer by layer with a thickness of 1 / 2 sector ring, so that the sixth sector ring is connected to the first sector ring in a way that it is 1 / 2 sector ring thickness higher than the first sector ring; wherein the first, third and fifth sector rings are respectively assigned three basic colors, and the second, fourth and sixth sector rings are respectively assigned three transition colors, and the transition colors are mixed transition colors of two adjacent basic colors; the bottom surfaces of the first sector ring and the central white cylinder are flush with the bottom surface of the refractive layer; the thickness of each sector ring is equal and is 0.4r-0.6r.

7. The model according to claim 2, characterized in that The annular pigment layer is a three-dimensional ring, which is obtained by processing the height difference between two adjacent fan rings in a closed-loop stepped ring structure into a gentle slope and then further processing it into a continuous and smooth curved surface; the three-dimensional ring is evenly divided into 6 blocks, the first, third and fifth blocks along the circumferential direction are respectively given three basic colors, the second, fourth and sixth blocks are respectively given three gradient transition colors, and the transition colors are gradient transition colors of two adjacent basic colors; an angle is formed between the three-dimensional ring and the bottom surface of the refractive layer; the lowest position of the bottom surface of the three-dimensional ring and the bottom surface of the central white cylinder are flush with the bottom surface of the refractive layer, and the thickness of the three-dimensional ring is 0.6r-0.75r.

8. A method for preparing a visual illusion material based on the skin color change mechanism of cephalopod organisms, characterized in that: include: Modeling is performed according to the model based on the skin color change mechanism of cephalopod organisms according to any one of claims 1 to 7; then, the pigment information layer is printed with a colored photosensitive polymer material, and the refractive layer is printed with a transparent photosensitive polymer material using Stratasys full-color 3D printing technology; After printing is completed, it is cured under UV light to obtain the visual illusion material based on the skin color change mechanism of cephalopod organisms.

9. The preparation method according to claim 8, characterized in that: The refractive index of the transparent photopolymer material is preferably 1.5-1.

8.

10. A visual illusion material based on the skin color change mechanism of cephalopod organisms, characterized in that: The preparation method is described in claim 8 or 9.

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