Acceleration Structure Generation for Ray Traversal Optimization
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Solution Overview
Problem
Current ray tracing methods require significant computation and memory bandwidth for traversal and intersection tests, leading to inefficiencies in 3D rendering.
Innovation Solution
The method involves dividing a 3D space into bounding boxes, determining overlapping positions, and generating an acceleration structure that represents these positions, allowing for early termination of traversal when a hit point is found, thereby reducing unnecessary computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ray tracing traversal is performed without optimization, then complete intersection testing is achieved, but computation time and memory bandwidth consumption increase significantly
Solution Approach 1:
The patent pre-calculates and stores overlap information between bounding boxes during the acceleration structure generation phase. This preliminary action enables the traversal algorithm to quickly determine whether further intersection testing is necessary by checking if the hit point lies within overlapping regions, thereby avoiding unnecessary traversal operations and reducing computation time while maintaining testing completeness
Solution Approach 2:
The patent segments the 3D space into a hierarchical acceleration structure (such as BVH or KD-tree) where bounding boxes are organized in levels. This segmentation allows the traversal to proceed from coarse to fine levels, enabling early termination when the hit point is determined to be outside overlapping regions, thus reducing the number of nodes that need to be traversed
2Reliability
If traditional ray tracing traversal is performed without optimization, then all primitives are tested for intersection, but memory bandwidth consumption increases due to broad traversal
Solution Approach 1:
The patent pre-computes and stores overlap information between bounding boxes in the acceleration structure during the generation phase. This preliminary action allows the traversal algorithm to use this pre-stored information to quickly determine whether to continue traversing into child nodes, thereby reducing memory accesses during the actual ray tracing operation while maintaining intersection test accuracy
Solution Approach 2:
The patent extracts and stores only the essential overlap information between bounding boxes during acceleration structure generation. This extracted information is sufficient for early termination decisions, allowing the system to avoid accessing broader portions of memory during traversal, thus reducing memory bandwidth consumption while preserving intersection test accuracy
Data Source
AI summary
A method of generating an acceleration structure for ray tracing, the method including, using a processor, dividing a three-dimensional (3D) space including primitives into bounding boxes, obtaining position information of where the bounding boxes overlapping each other, and generating an acceleration structure representing the position information and an inclusion relation between the bounding boxes. Also disclosed is a related method of traversing an acceleration structure.