A method for predicting the shape of a slanted skirt and a method for generating customized shapes.

Abstract

The application discloses a kind of slanted skirt modeling prediction method and fixed manufacturing modeling generation method;The prediction method is as follows: 1, using fan ring-shaped template as the template for making slanted skirt, detect the slanted skirt made by fan ring-shaped template of different sample angles;Detect the multiple modeling parameters of the slanted skirt corresponding to different sample angles θ.2, build the relationship between each modeling parameter and sample angle.3, using the relationship obtained in step two, obtain the modeling parameters corresponding to different fan ring-shaped skirt pieces, complete the slanted skirt modeling prediction made by different fan ring-shaped skirt pieces.The application builds the relationship between the central angle of fan ring-shaped slanted skirt template and multiple modeling parameters of slanted skirt, so that the template used for slanted skirt of custom expected modeling can be quickly determined according to the relationship between modeling requirements and modeling parameters, and the relationship between modeling parameters and central angle, or the overall three-dimensional modeling of the slanted skirt formed by the template can be predicted in advance according to the structure of the template.

Description

Technical Field

[0001] This invention belongs to the field of textile and apparel performance testing technology, specifically relating to a method for predicting the shape of a slant skirt and a method for generating a customized shape. Background Technology

[0002] Asymmetrical skirts are a type of skirt where all the darts are transferred to the hem to form the skirt's flare, based on a fitted skirt. Their structure is similar to a semi-circular skirt, but they are less restricted by the waist-to-hip difference and eliminate the function of darts. Their shape falls between a fitted skirt and a semi-circular skirt, offering elegance, style, versatility, and a wide appeal. Their beautiful shape makes them a popular choice for women. The key factors influencing the shape of an asymmetrical skirt are the pattern structure and fabric properties. The pattern structure determines the length, width, and wave shape of the skirt, while the fabric properties directly affect its fit and flow. To date, the relationship between fabric properties and the shape of asymmetrical skirts has been a focus of research for many scholars. For example, Xie Lulu of Zhejiang University of Technology studied the impact of fabric properties on the appearance of asymmetrical skirts; Lu Jiabing of Donghua University studied the connection between the shape of asymmetrical skirts and fabric properties; and Ni Hong of Suzhou University studied the relationship between the form and style of a wavy asymmetrical skirt and fabric properties. Wu Qiaoying studied the relationship between the shape of an A-line skirt and fabric properties, analyzing that the objective shape indicators of an A-line skirt are mainly affected by bending stiffness, elongation, surface density, and drape.

[0003] Besides fabric properties, pattern structure is also an important factor affecting the shape of a slant skirt. However, there is currently a lack of research on the relationship between pattern structure and the specific shape parameters of a slant skirt, and it is impossible to predict in advance what shape the pattern will result in after it is made into a slant skirt before it is made into a physical slant skirt. Summary of the Invention

[0004] The purpose of this invention is to provide a method for predicting the shape of a slant skirt and generating a customized slant skirt shape.

[0005] In a first aspect, the present invention provides a method for predicting the shape of a slanted skirt, which includes the following steps:

[0006] Step 1: Create a dataset.

[0007] 1-1. Drawing the bias skirt pattern: To draw a complete bias skirt pattern, two front pieces and two back pieces are needed, with the center front and center back pieces being straight threads. The radius of the fan ring is the skirt length, and the waist circumference W is the length of four inner arcs. The relationship between the waist circumference W and the inner circle radius R is as follows: Because women's bodies have a slightly protruding front abdomen and a concave lower back, the back midline is 1cm shorter than the front midline to achieve a better fit to the human body.

[0008] 1-2. The production of a series of asymmetrical skirts uses the pattern angle θ as a factor influencing the skirt's structural variation. This ensures that when the pattern angle θ is minimized, the resulting skirt has a reasonable ease at the waist and hips, and the side seams are straight. Preliminary experiments determine the typical range of asymmetrical skirt pattern angles, ensuring the skirt's hem is greater than a fitted skirt but less than a semi-circular skirt. Patterns for a series of asymmetrical skirts with different angles θ are drawn. Common fabrics used for asymmetrical skirts, such as cotton, cotton-linen blends, and polyester-cotton blends, are selected. After cutting, sewing, and ironing, the series of asymmetrical skirts is completed.

[0009] 1-3. Using four fan-shaped skirt pieces (left front, right front, left and right, and right back) as templates for making a slanted skirt, we tested multiple shape parameters of the slanted skirt made using fan-shaped skirt pieces with different template angles θ, including volume, surface area, mean outward fold angle, mean inward fold angle, wave number, mean peak height, mean trough height, mean peak angle, and mean trough angle. We used these parameters as a dataset.

[0010] Step 2: Based on the dataset obtained in Step 1, construct the relationship between each modeling parameter and the template angle θ.

[0011] Step 3: Using the relationship obtained in Step 2, obtain the shape parameters of the slanted skirt corresponding to different template angles θ, and complete the shape prediction of the slanted skirt made from different fan-shaped skirt pieces.

[0012] As a preferred option, the relationship between the template angle θ and multiple shaping parameters is obtained through fitting.

[0013] As a preferred embodiment, with a waist circumference of 66cm and a skirt length of 60cm corresponding to the asymmetrical skirt, the relationship between the pattern angle θ and multiple styling parameters is as follows:

[0014] V = -91.796 * θ 3 +358006.539*θ+26869064.64

[0015] S = 0.780 * θ 3 +7767.524*θ+426342.341

[0016]

[0017]

[0018] n = 0.067 * θ + 4.667

[0019]

[0020]

[0021]

[0022]

[0023] X ρ =0.0000214*θ 3 -0.100*θ+3.384

[0024] Where V is volume and S is surface area; This represents the average outward fold angle. The mean of the concave fold angles; n is the wave number; The mean of the peaks; The average of the troughs; The mean of the angle between the wave crests; The mean of the trough angle; X ρ This represents the rate of change of the amplitude angle.

[0025] Preferably, the design parameters also include the waist circumference, hip circumference, three cross-sections from top to bottom on the skirt, and the ellipticity σ9 and σ of the hem cross-section. 18 σ 27 σ 36 σ 45 σ 54 The relationship between it and the template angle θ is as follows:

[0026] σ9=0.001*θ 2 -0.051*θ+2.208

[0027] σ 18 =0.001*θ 2 -0.041*θ+1.981

[0028] σ 27 =0.000485*θ 2 -0.036*θ+1.929

[0029] σ 36 =0.000453*θ 2 -0.036*θ+1.885

[0030] σ 45 = -0.000464*θ 2 -0.038*θ+1.921

[0031] σ 54 =0.00000487*θ 3 -0.025*θ+1.775

[0032] The distances between the waist circumference section, hip circumference section, the three sections from top to bottom on the skirt body, the skirt hem section and the lower edge of the skirt waist are 9cm, 18cm, 27cm, 36cm, 45cm and 54cm, respectively.

[0033] Preferably, the value of the template angle θ ranges from 20° to 65°.

[0034] As a preferred option, the fabric used for the fan-shaped skirt piece is cotton, cotton-linen blend, polyester-cotton imitation, or polyester-cotton blend.

[0035] Preferably, the fan-shaped skirt piece uses the warp yarn as one edge; when making a bias skirt using the fan-shaped skirt piece, the warp yarn is used as the front or back center seam of the bias skirt, and the other side bias yarn edge is used as the side seam of the bias skirt. The edge of the fan-shaped skirt piece used as the side seam is 3cm to 4cm shorter than the edge used as the center seam.

[0036] As a preferred option, in step three, the various shape parameters of the skirt are detected by performing a 3D scan of the skirt worn on the mannequin and analyzing the point cloud data.

[0037] Preferably, the average outward pleat angle is the inclination angle θ of all outward pleats on the bias skirt. ti The mean; the tilt angle θ of the outward fold. ti The expression is:

[0038]

[0039] Where, x i y i x and y represent the X and Y coordinates of the endpoints of the outward-spreading pleats on the lower edge of the skirt waistline, respectively; i '、y i ' represents the X-axis and Y-axis coordinates of the endpoints of the outward folds on the hem, respectively; l represents the Z-axis coordinate difference between the endpoints of the outward folds on the lower edge of the waistband and the endpoints on the hem.

[0040] The average angle of the concave pleats is the tilt angle θ of all the concave pleats on the bias skirt. aj The mean value; the inclination angle θ of the concave fold. aj The expression is:

[0041]

[0042] Where, x j y j x and y represent the X and Y coordinates of the endpoints of the concave pleats on the lower edge of the skirt waistline, respectively; j '、y j ' represents the X-axis coordinate and Y-axis coordinate of the endpoint of the concave fold on the skirt hem.

[0043] Secondly, the present invention provides a method for producing custom-designed asymmetrical skirts, comprising the following steps:

[0044] Step 1: Use four fan-shaped skirt pieces to make a slanted skirt; detect the fan-shaped skirt pieces with different template angles θ to obtain multiple shape parameters of the slanted skirt, including the volume after wearing, surface area, mean outward fold angle, mean inward fold angle, wave number, mean peak height, mean trough height, mean peak angle, and mean trough angle, as a dataset.

[0045] Step 2: Based on the dataset obtained in Step 1, construct the relationship between each modeling parameter and the template angle θ.

[0046] Step 3: Based on the design requirements of the asymmetrical skirt, determine the range of values ​​for each design parameter; using the range of values ​​for each parameter and the relationship determined in Step 2, select the template angle θ.

[0047] Step 4: Using the template angle θ determined in Step 3, draw the bias skirt template according to Step 1, select the fabric, and go through processes such as cutting, sewing, and ironing to form a bias skirt that meets the styling requirements.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] 1. This invention constructs a relational formula between the central angle of the fan-shaped asymmetrical skirt template and multiple shaping parameters of the asymmetrical skirt. Based on the relationship between the shaping requirements and the shaping parameters, as well as the relationship between the shaping parameters and the central angle, the template used to customize the desired shape of the asymmetrical skirt can be quickly determined, or the template structure can help the designer predict the overall three-dimensional shape of the asymmetrical skirt formed by the template in advance.

[0050] 2. This invention uses 3D scanning technology to quickly collect multiple shape parameters of a slanted skirt, enabling a more objective and accurate evaluation of its appearance features, thus providing a foundation for realizing spatial visualization of clothing. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the slanted skirt template structure used in this invention.

[0052] Figure 2 This is a schematic diagram of the triangular mesh surface representation of the point cloud model extracted from the sloping skirt according to the present invention.

[0053] Figure 3 This is a schematic diagram of multiple cross-sections of the inclined skirt in this invention.

[0054] Figure 4 This is a cross-sectional view of the slanted skirt hem extracted according to the present invention.

[0055] Figure 5 This is a schematic diagram of the outward fold angle of the diagonal skirt extracted in this invention.

[0056] Figure 6 This is a schematic diagram of the concave fold angle of the oblique skirt extracted in this invention. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0058] A method for predicting the shape of a slanted skirt includes the following steps:

[0059] Step 1: Drawing the bias skirt pattern, according to... Figure 1 Draw the bias skirt pattern as shown. Figure 1 Including one front and one back skirt piece, to form a complete asymmetrical skirt, two front pieces and two back pieces are needed. The center front and center back pieces are made of straight yarn (i.e., warp yarn). The radius of the fan loop is equal to the skirt length, and the waist circumference W is the length of four inner arcs. The relationship between the waist circumference W and the inner arc radius R is as follows: Because women's bodies have a slightly protruding front abdomen and a concave back waist, the back center line is 1cm shorter than the front center line to achieve a close fit to the human body. In addition, the side seams are shortened by 3-4cm to compensate for the dimensional changes caused by the stretching of the fabric's bias yarn.

[0060] Step Two: Making a series of asymmetrical skirts. The pattern angle θ is used as a factor in varying the asymmetrical skirt structure. When the pattern angle θ is minimized, the resulting asymmetrical skirt has a reasonable ease at the waist and hips, and the side seams are straight. Preliminary experiments determine the typical range of asymmetrical skirt pattern angles, ensuring the skirt hem is greater than a fitted skirt but less than a semi-circular skirt. Patterns for a series of asymmetrical skirts with different angles θ are drawn. Common fabrics used for asymmetrical skirts, such as cotton, cotton-linen blends, polyester-cotton blends, and polyester-cotton blends, are selected. After cutting, sewing, and ironing, the series of asymmetrical skirts is completed.

[0061] Step 3: Select a suitable mannequin, iron the skirt to be measured, and then put it on the mannequin. Ensure that the waistband of the skirt is completely above the waistline of the mannequin, and that the lower edge of the waistband is aligned with the waistline of the mannequin. The seams on the left and right sides of the skirt should be symmetrical, and the skirt should be balanced and stable when worn.

[0062] Step 4: Using a 3D scanning device, spatial information of the skirt shape is obtained through light reflection calibration. To avoid errors, the same scanner is used to perform three depth scans on the skirt under test, obtaining three point cloud models of the skirt. In this embodiment, the 3D scanning device used is a handheld multi-functional 3D scanner, model EinScan Pro 2X Plus.

[0063] Step 5: 3D Point Cloud Acquisition: After connecting the 3D scanning device to the computer, recalibrate and complete the accuracy test to ensure the scanning error is within 0.001mm. Open the software corresponding to the 3D scanning device (EXScan pro in this example), select the "Handheld Quick Scan" mode, click "New Multiple Projects," and set "Non-Texture Scan"—"Feature Stitching"—"Quick Operation Mode"—"1.0mm Resolution"—"Apply." Before scanning, click the scan preview to ensure the scanner is within the effective space around the slope skirt being measured. Adjust the position according to the distance detector color to avoid losing the scanned target. The distance display will show three indicators: red, green, and purple. Green indicates a suitable distance, red indicates too close or too far, and purple indicates the scanned target is lost.

[0064] Step Six: 3D Point Cloud Processing: Once the scanned model of the oblique skirt is basically complete, pause the scan, rotate and zoom in on the scanned point cloud model, and check the point cloud collection at the folds and recesses of the skirt. If holes or gaps appear, continue scanning; if the model is complete, click "Generate Point Cloud" to obtain a complete point cloud model. After scanning, encapsulate the data, select a non-closed model with a generated mesh, and perform basic point cloud processing in the software. Basic point cloud processing includes simplification, mesh optimization, smoothing, and hole filling operations to ensure the integrity of the scanned data. Finally, click "Save Data," select STL format to save the point cloud, with one STL file for each sample.

[0065] Step 7: Extract the overall silhouette indicators of the skirt being measured. The overall silhouette specifically refers to the external spatial silhouette formed by the skirt after it is worn on the mannequin. Based on the overall silhouette, extract the volume V and surface area V of the skirt after it is worn on the mannequin. The volume V and surface area S of the skirt reflect the volume and three-dimensionality of the skirt's design. To accurately measure this three-dimensional spatial quantity, the following steps are performed... Figure 2 The point cloud model shown is triangularly meshed. The area of ​​the surface enclosed by the region and the total 3D space contained within the region are evaluated. The 3D point cloud model is imported into reverse engineering software (specifically Imageware 13.0 in this embodiment), and the volume and surface area are obtained using the "Evaluation" function of the triangular mesh model.

[0066] Step 8: Extract the lateral shape indices of the tested asymmetrical skirt. Lateral shape specifically refers to the silhouette characteristics of the tested asymmetrical skirt in cross-section after it is worn; lateral shape indices include ellipticity σ, wave number n, and mean wave crest value. trough mean Wave amplitude change rate X d Mean angle of wave crests Mean of the trough angle Rate of change of amplitude angle X ρ

[0067] 8-1. The waist, abdominal, hip, and hem circumference cross sections of the measured oblique skirt point cloud are used as the research objects. In the reverse engineering software, the "Parallel Section Cut Point Cloud Tool" is used to cut a characteristic cross section layer at 9cm intervals in the XOY plane along the negative Z-axis of the point cloud model. The results are as follows: Figure 3 As shown, L k The units refer to the cross-sections, and k is the distance between each cross-section and the XOY plane, with values ​​[0, 9, 18, 27, 36, 45, 54]. All length units in this embodiment are cm. Specifically, L0 is the waist circumference cross-section, L9 is the abdominal circumference cross-section, and L... 18 For hip circumference, L 27 L 36 L 45 For three skirt sections, L 54 This is the cross-section of the skirt. Define the Z-axis and the cross-section L. 54 The intersection point is the center point O of the skirt section. L54 Simultaneously extract the area S of each cross-section. Lk And the width W of the minimum bounding rectangle Lk Thickness T Lk .

[0068] 8-2. Extract the ellipticity σ of each cross-section. Ellipticity σ, used to evaluate the shape of a cross-section, refers to the ratio of the width to the thickness of the smallest bounding rectangle of the cross-section. A larger value indicates that the cross-section is closer to an ellipse, while a smaller value indicates that the cross-section is closer to a circle. The expression for ellipticity σ is:

[0069] 8-3. Extract the wavenumber n and mean peak value for each cross section. trough mean Wave amplitude change rate X d Mean angle of wave crests Mean of the trough angle Rate of change of amplitude angle X ρ .like Figure 4 As shown, wave number, wave peak, and wave trough average can reflect the wave shape of the sloping skirt to a certain extent.

[0070] Wave number n refers to the number of waves in the skirt hem, which is calculated by counting the number of outward-convex waves or the number of inward-concave waves.

[0071] The crest refers to the center of the cross section O L54 To the peak point P of each convex wave segment t The distance is (xi,yi,-54).

[0072] The trough refers to the point P, the concave trough of each segment, extending from the center of the cross-section. a The distance between (xj, yj, -54).

[0073] Peak mean trough mean These are the average values ​​of all peaks and all troughs, respectively, i.e., the peak mean. trough mean d Fi Let d be the value of the i-th peak; Gi Let be the value of the i-th trough; n is the number of peaks on the cross section. i = 1, 2, ..., n.

[0074] Wave amplitude change rate X d This is an indicator for evaluating the magnitude of wave fluctuations. The closer the value is to 1, the more consistent the wave fluctuations; conversely, the further away it is, the more significant the differences in wave fluctuations. The wave amplitude change rate X... d The expression is as follows:

[0075]

[0076] Rate of change of amplitude angle X ρ The uniformity of the angle variation between the crests and troughs is used as an indicator of the evenness of the skirt pleats. It is expressed as the ratio of the standard deviation of the crest angle to the standard deviation of the trough angle, and the calculation formula is as follows:

[0077]

[0078] Where, ρ Fi Let ρ be the angle between the i-th wave crests. Gi Let i be the angle between the i-th troughs; i = 1, 2, ..., n; The mean of the angles between all the wave crests; This is the mean of the angles between all the troughs.

[0079] Step 9: Extract the longitudinal shape indicators of the skirt being measured. The longitudinal shape specifically refers to the curvature path of the skirt; the longitudinal shape indicators include the average outward fold angle. Mean of concave fold angle Standard deviation coefficient of outward fold angle Concave fold angle standard deviation coefficient

[0080] 9-1. Extract the mean outward fold angle used to evaluate the degree of undulation in the fold space. Mean angle of concave fold As shown in equations (3) and (4).

[0081]

[0082]

[0083] Where, θ ti The angle of the outward pleats is specifically the angle from the starting point P of the waistline for each outward pleat. t 'To the peak of the skirt't The angle between the line connecting the two sides and the vertical direction (i = 1, 2, 3, ..., n | n is the wave number of the skirt being measured), such as Figure 5 , 6 As shown. θ aj The concave fold angle is P, which is the starting point of the waist circumference. a 'With the trough point P of the skirt hem a The angle between the line connecting the two sides and the vertical direction (j = 1, 2, 3, ..., n | n is the wave number of the skirt being measured).

[0084] outward fold angle θ ti The expression is:

[0085]

[0086] Concave angle θ aj The expression is:

[0087]

[0088] 9-2. Extract the standard deviation coefficient of the outward fold angle to represent the uniformity and degree of variation of the fold angle. Concave fold angle standard deviation coefficient As shown in equations (5) and (6).

[0089]

[0090]

[0091] in, The standard deviation of the outward fold angle is expressed as follows: The standard deviation of the concave fold angle is expressed as follows:

[0092] 9-3. Extract the pleat spread angle ratio X to represent the uniformity of the undulation of the skirt's pleats. θ As shown in equation (7).

[0093]

[0094] Among them, S θt S is the standard deviation of all outward fold angles. θa is the standard deviation of all concave fold angles.

[0095] The pleat aspect ratio X θ The closer the value is to 1, the closer the angles of the outward and inward expansion of the pleats are, and the more uniform the pleat undulations. The further the value deviates from 1, the greater the difference in the angles of the outward and inward expansion of the pleats, and the more uneven the pleat undulations.

[0096] Step 10: Establish the relationship between the pattern angle θ and multiple parameters of the bias skirt. In this embodiment, a fan-shaped fabric is used as the pattern for the bias skirt; the pattern angle θ is specifically the central angle corresponding to the fan-shaped pattern. The bias skirt is obtained by sewing together four pieces of fan-shaped fabric from the front and back.

[0097] In this embodiment, the waist circumference corresponding to the asymmetrical skirt is set to a common waist circumference of 66cm, and the skirt length is set to a common skirt length of 60cm. Asymmetrical skirts prepared using fan-shaped fabrics with multiple different pattern angles θ are subjected to parameter acquisition according to steps one through nine. Based on the obtained parameters and the corresponding pattern angle θ, the relationship between multiple shaping parameters of the asymmetrical skirt and the pattern angle θ is fitted.

[0098] V = -91.796 * θ 3 +358006.539*θ+26869064.64 (8)

[0099] S = 0.780 * θ 3 +7767.524*θ+426342.341 (9)

[0100]

[0101]

[0102] n = 0.067*θ + 4.667 (12)

[0103]

[0104]

[0105]

[0106]

[0107] X ρ =0.0000214*θ 3 -0.100*θ+3.384 (17)

[0108] σ9=0.001*θ 2 -0.051*θ+2.208 (18)

[0109] σ 18 =0.001*θ 2 -0.041*θ+1.981 (19)

[0110] σ 27 =0.000485*θ 2 -0.036*θ+1.929 (20)

[0111] σ 36 =0.000453*θ 2 -0.036*θ+1.885 (21)

[0112] σ 45 = -0.000464*θ 2 -0.038*θ+1.921 (22)

[0113] σ 54 =0.00000487*θ 3 -0.025*θ+1.775 (23)

[0114] Where V is volume and S is surface area; This represents the average outward fold angle. The mean of the concave fold angles; n is the wave number; The average peak height; The average height of the troughs; The average peak height; The mean of the trough angle; X ρ The rate of change of the amplitude angle; σ9, σ 18 σ 27 σ 36 σ 45 σ 54 These are the waist circumference, hip circumference, three cross-sections from top to bottom on the skirt, and the ellipticity of the hem section, respectively. The calculations in equations (8) to (23) are dimensionless, and the corresponding vertical unit is: volume in cm³. 3 Units: cm²; area is expressed in cm². 2 Units: length is in cm; angles are in ° (i.e., degrees).

[0115] Based on the above prediction method, this embodiment can further produce customized asymmetrical skirts, and the specific process is as follows:

[0116] Based on the design requirements of the asymmetrical skirt, determine the range of values ​​for each parameter of the asymmetrical skirt; then, using the range of values ​​for each parameter of the asymmetrical skirt, select the optimal template angle θ through equations (8) to (23); the range of θ is 20° to 65°; using the four templates corresponding to the optimal template angle θ, make an asymmetrical skirt that meets the design requirements. When applying the above equations, you can flexibly choose according to actual needs. If there are requirements for the volume of the asymmetrical skirt, you can choose equation (8); if there are requirements for the average height of the troughs of the asymmetrical skirt, you can choose equation (14), and so on. After determining the template angle θ, draw the asymmetrical skirt template according to the template making method in step one, select the fabric, and after cutting, sewing, ironing and other processes, the asymmetrical skirt with the expected shape can be formed.

[0117] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for predicting the shape of a slanted skirt, characterized in that: The method comprises the following steps: Step one, using four fan ring skirt pieces to make a slanted skirt; detecting the slanted skirt made by the fan ring skirt pieces with different sample angles θ, obtaining multiple modeling parameters of the slanted skirt corresponding to different sample angles θ; the modeling parameters of the slanted skirt include the volume, the surface area, the average angle of the outer fold, the average angle of the inner fold, the wave number, the average height of the wave crest, the average height of the wave trough, the average angle of the wave crest, and the average angle of the wave trough after wearing, as a data set; the angle of the outer fold is the angle between the line from the waist circumference starting point to the skirt hem wave crest point and the vertical direction; the angle of the inner fold is the angle between the line from the waist circumference starting point to the skirt hem wave trough point and the vertical direction; Step two, constructing the relationship between the modeling parameters and the sample angle θ according to the data set obtained in step one; the relationship between the sample angle θ and the multiple modeling parameters corresponding to the slanted skirt with a waist circumference of 66 cm and a skirt length of 60 cm is as follows: V=-91.796× 3 +358006.539× +26869064.64 S=0.780× 3 +7767.524× +426342.341 =-0.005× 2 +0.448× +4.338 =0.002× 2 -0.163× +7.017 n=0.067× +4.667 =-0.011× 2 +1.747× +184.900 =-0.584× 2 +151.528 =0.006× 2 -0.914× +75.886 =0.005× 2 -0.799× +74.189 =0.0000214× 3 -0.100× +3.384 wherein V is the volume; S is the surface area; is ; is ; n is the wave number; is the average wave peak height; is the average wave trough height; is ; ; is the wave amplitude angle change rate; the wave amplitude angle change rate is the ratio of the wave peak angle standard deviation and the wave trough angle standard deviation; Step three, obtaining the modeling parameters corresponding to different fan ring skirt pieces by using the relationship obtained in step two, and completing the modeling prediction of the slanted skirt made by different fan ring skirt pieces.

2. The method of claim 1, wherein: The relationship between the sample angle θ and the multiple modeling parameters is obtained by fitting.

3. The method of claim 1, wherein: The aforementioned design parameters also include the waist circumference, hip circumference, three cross-sections from top to bottom on the skirt, and the ellipticity σ9 and σ of the hem cross-section of the skirt. 18 σ 27 σ 36 σ 45 σ 54 The relationship between it and the sample angle θ is as follows: σ9 = 0.001 x 2 -0.051 x +2.208 σ 18 = 0.001 x 2 - 0.041 x + 1.981 σ 27 = 0.000485 x 2 - 0.036 x + 1.929 σ 36 = 0.000453 x 2 - 0.036 x + 1.885 σ 45 -0.000464 2 -0.038 +1.921 σ 54 = 0.00000487 x 3 - 0.025 x + 1.775 The distance between the abdominal circumference section, the hip circumference section, the three sections from top to bottom on the skirt body, the skirt hem section and the lower edge of the waistline is 9 cm, 18 cm, 27 cm, 36 cm, 45 cm and 54 cm respectively; the ellipticity is the ratio of the width to the thickness of the smallest circumscribed rectangle of the section.

4. The method of claim 1, wherein: The sample angle θ ranges from 20° to 65°.

5. The method of claim 1, wherein: The fan ring skirt piece takes a radial line as one of the edges; during the process of making a slanted skirt using the fan ring skirt piece; the fan ring skirt piece takes the edge along the radial line as the front center seam or the back center seam of the slanted skirt, and takes the other side edge as the side seam of the slanted skirt; the edge of the fan ring skirt piece as the side seam is shortened by 3 cm to 4 cm compared to the edge as the center seam.

6. The method of claim 1, wherein: In step one, the three-dimensional scanning of the slanted skirt worn on the mannequin is performed, and the point cloud data is analyzed to detect the modeling parameters of the slanted skirt.

7. The method of claim 1, wherein: The average of the gusset angles is the average of the angles of inclination of all the gusset angles of the skirt of the gusset angles The expression of the average of the gusset angles is: ； wherein x i , y i are the X-axis coordinate, Y-axis coordinate of the end point of the flare pleat on the lower waistline; x i ', y i ' are the X-axis coordinate, Y-axis coordinate of the end point of the flare pleat on the skirt; and l is the Z-axis coordinate difference between the end point of the flare pleat on the lower waistline and the end point of the flare pleat on the skirt. The average of the inner recess fold angles is the average of the angles of inclination of all the inner recess folds on the sloped skirt of the inner recess folds is expressed by ； wherein x j , y j are the X-axis coordinate, Y-axis coordinate of the end point of the inner concave fold on the lower edge line of the waist; x j ', y j ' are the X-axis coordinate, Y-axis coordinate of the end point of the inner concave fold on the skirt.

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