Relightable Holograms for 3D Printed Models
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Solution Overview
Problem
Current 3D printing technologies are limited in capturing the true reflectance properties of objects, such as complex light-reflectance behaviors, resulting in models that fail to accurately replicate the appearance of real objects, especially those with intricate light interactions like human skin or metallic surfaces.
Innovation Solution
The method involves generating and affixing relightable holograms to 3D printed models, which encode the Bi-directional Reflectance Distribution Function (BRDF) of the object's surface, allowing the model to accurately reflect light as the actual object would, thereby enhancing the model's realism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 3D printing is used to create physical models, then the models can be produced with three-dimensional depth information, but the models fail to accurately replicate the complex light-reflectance properties and appear unrealistic
Solution Approach 1:
The solution segments the lighting information into multiple individual holograms, each corresponding to a specific light source direction. These holographic pixels are printed separately and then assembled on the 3D model surface, allowing complex BRDF properties to be broken down into manageable components that can be manufactured and applied systematically
Solution Approach 2:
The invention combines conventional 3D printed physical models with holographic optical elements to create a composite structure. The 3D model provides the geometric depth information while the holographic layers provide the light-reflectance properties, creating a composite material system that achieves both structural accuracy and optical realism
2Manufacturing precision
If holographic elements are added to capture accurate light reflectance properties, then the realism of the model is significantly improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The holographic printing system is designed to be universal and multi-functional, capable of capturing and reproducing various types of light-reflectance properties (specular, diffuse, glossy, matte) through a single integrated process. The same holographic printing apparatus can handle different material types and lighting conditions, reducing the need for multiple specialized devices
Solution Approach 2:
The invention uses copying techniques to replicate the optical properties of real objects. By capturing the BRDF data from actual materials and reproducing it through holographic printing, the system creates accurate optical copies of the light-interaction behavior without needing to physically replicate the complex micro-structures that cause those effects
3Adaptability or versatility
If relightable holograms are applied to 3D printed models, then the models exhibit realistic light interaction under various lighting conditions, but the process requires additional materials and post-processing steps
Solution Approach 1:
The invention changes the parameters of the 3D printed model by incorporating holographic elements with specific optical properties. The holographic pixels are designed with varying diffraction efficiencies, orientations, and densities to encode different aspects of the BRDF, allowing the model to adapt its light reflection behavior across multiple lighting conditions through controlled parameter variations in the holographic layer
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables 3D printed models to exhibit realistic light reflectance properties, making them appear more lifelike by incorporating both depth and light interaction attributes, surpassing the limitations of conventional 3D printing techniques.
Implementation Method 1
each printed hologram comprising at least one holographic pixel that encodes lighting information of one of a plurality of regions of an object surface
Data Source
AI summary
Lighting information comprising at least the reflectance data of a plurality of regions of an object surface is generated and printed out as a series of relightable holograms. Each of the printed holograms comprises the reflectance data of a corresponding region of the object. A model of the object is generated such that the model also comprises a plurality of portions corresponding to the regions of the object surface. The series of holograms are each affixed to a portion of the model such that a particular hologram of the series which encodes the reflectance data of a particular region of the object is affixed to the corresponding portion of the model. In an embodiment, the model of the object is generated from a metal. The series of holograms is engraved directly onto the metallic model such that a particular hologram of the series which encodes the reflectance data of a particular region of the object is engraved onto the corresponding portion of the metallic model.