Dynamic Ray Cast Intersection Acceleration Structure
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Solution Overview
Problem
Current ray cast rendering techniques are inefficient due to 'false positives' where virtual light rays intersect bounding volumes but not the primitives within them, leading to unnecessary computational resources being expended.
Innovation Solution
A dynamic rendering acceleration system modifies the intersection acceleration structure (IAS) based on the subset of virtual light rays that encounter each bounding volume during rendering, generating a modified IAS for subsequent frames to reduce false positives and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a static intersection acceleration structure (IAS) is used for ray cast rendering, then the rendering process is simple to implement, but computational resources are wasted due to false positives where rays intersect bounding volumes but not the primitives within them
Solution Approach 1:
The patent applies the dynamics principle by transforming the static IAS into a dynamic one that adapts to different scene configurations and lighting conditions. The system generates modified IAS structures tailored to specific rendering scenarios, allowing the acceleration structure to change based on the actual ray-primitive intersection patterns observed during rendering, thereby reducing false positives and computational waste.
Solution Approach 2:
The patent employs parameter changes by modifying the IAS structure parameters based on scene-specific characteristics. The system analyzes ray traversal patterns and adjusts the bounding volume hierarchy parameters dynamically, changing the organization and properties of the acceleration structure to better match the actual rendering requirements, thus improving efficiency without sacrificing ease of implementation.
2Productivity
If a dynamic rendering acceleration system modifies the IAS based on virtual light ray tracking, then computational efficiency is improved by reducing false positives, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-tracking virtual light rays and analyzing their intersection patterns with bounding volumes before generating the modified IAS. This preparatory step allows the system to identify false positive patterns in advance and construct an optimized acceleration structure that eliminates these inefficiencies, achieving high rendering efficiency without requiring complex real-time modifications during the actual rendering process.
Solution Approach 2:
The system implements feedback by using the results of ray traversal analysis to continuously improve the IAS structure. The patent tracks which bounding volumes produce false positives and uses this feedback information to refine and regenerate the acceleration structure, creating a closed-loop system that automatically optimizes rendering performance based on observed patterns, thereby managing complexity through systematic feedback mechanisms.
3Measurement precision
If virtual light rays are tracked for each bounding volume to identify false positives, then the accuracy of rendering optimization is improved, but the time required for IAS modification increases
Solution Approach 1:
The patent applies partial action by tracking virtual light rays through only certain bounding volumes that are most likely to produce false positives, rather than exhaustively analyzing every single bounding volume in the scene. The system identifies and focuses computational efforts on critical areas where optimization will have the greatest impact, achieving high optimization accuracy without requiring complete analysis of the entire scene, thus reducing the time required for IAS modification.
Data Source
AI summary
Systems and techniques are provided for dynamically modifying an intersection acceleration structure (IAS) used to accelerate ray cast rendering of a three-dimensional (3D) scene. A frame of the 3D scene is rendered via a set of ray casting operations performed in accordance with a first IAS, the first IAS including a plurality of bounding volumes that each includes a portion of the 3D scene. For each bounding volume, a subset of virtual light rays is tracked, the virtual light rays being associated with the set of ray casting operations and encountering the bounding volume during the rendering of the frame. Based on the subset of virtual light rays associated with each bounding volume, a modified second IAS is generated for rendering the 3D scene.