Feedback Illumination Culling for 3D Render Time Reduction
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Solution Overview
Problem
In computer animation, long render times are caused by computing illumination from light sources and generating point cloud files for 3D scenes, where only a small portion is visible, leading to inefficiencies and visual errors due to unaccounted subsurface scatter effects.
Innovation Solution
A method involving a custom shader that identifies and stores light sources and point cloud files contributing to each pixel, allowing for culling of non-contributory light sources and point cloud files, reducing render times by deactivating unnecessary components during rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all light sources are computed for all pixels, then illumination accuracy is maintained, but render time increases significantly
Solution Approach 1:
The patent extracts and stores only the essential illumination information (light source contributions) for each pixel in a lookup table during a first pass render, then uses this extracted data in subsequent passes to determine which light sources actually contribute to visible pixels. This allows the system to compute illumination for all light sources once, but only process and display relevant light contributions in later passes, significantly reducing total render time while maintaining accuracy for visible surfaces.
Solution Approach 2:
The patent performs preliminary computation of light source contributions for all pixels during an initial render pass, storing this data in a lookup table before the actual rendering process. This preliminary action allows the main rendering process to quickly query pre-computed illumination data rather than computing light contributions in real-time, dramatically reducing render time while preserving illumination accuracy for visible surfaces.
2Difficulty of detecting and measuring
If hidden surface removal techniques are used, then visible surface identification is improved, but subsurface scatter effects are not accounted for
Solution Approach 1:
The patent implements feedback by checking whether a light source actually contributes to illuminating a visible surface pixel before processing it. The system queries the lookup table to determine if a light source's illumination reaches the camera through visible surfaces, and only processes light sources that provide actual visual contribution. This feedback mechanism ensures that hidden surfaces and non-contributing light sources are correctly identified and excluded, while maintaining visual accuracy by preserving light sources that do contribute through subsurface scatter effects.
3Quantity of substance
If all light sources are processed manually, then illumination completeness is maintained, but production efficiency decreases
Solution Approach 1:
The patent implements self-service by enabling the rendering system to automatically determine which light sources contribute to visible pixels through the lookup table queries and feedback mechanisms. The system autonomously identifies and processes only relevant light sources without requiring manual intervention, maintaining illumination completeness through systematic evaluation of all light sources while dramatically improving production efficiency by eliminating tedious manual light source selection and re-rendering processes.
Data Source
AI summary
Techniques are disclosed for rendering graphics objects in a scene file. A first pixel is selected from a plurality of pixels that are associated with an image frame. A set of graphics objects that intersect with the first pixel is identified. For each graphics objects in the first set of graphics objects. a set of light sources that illuminates the respective graphics object at the first pixel is identified, and, for each light source in the set of light sources, an entry is stored in a first table that includes references to the first pixel, the respective graphics object, and the respective light source.