Adaptive BVH Rebuild with Biased Cost Function
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Solution Overview
Problem
Current graphics processing systems face inefficiencies in ray tracing due to the need to perform calculations from all directions, which is computationally expensive and consumes excessive resources, especially when dealing with updateable geometry in scenes.
Innovation Solution
The system biases ray tracing towards a particular direction based on previous frame statistics, updating a cost function to optimize the rebuilding of bounding volume hierarchies (BVH) structures, thereby reducing unnecessary computations by focusing on the direction with the most intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ray tracing is performed from all directions to ensure complete coverage, then ray tracing performance and accuracy are improved, but computational cost and resource consumption increase significantly
Solution Approach 1:
The patent applies local quality by making the ray tracing process directionally selective rather than uniform. Instead of treating all directions equally, the system identifies and prioritizes specific directions based on previous frame statistics, applying computational resources locally to the most relevant directions while reducing or eliminating tracing in less important directions. This resolves the contradiction by maintaining reliable ray tracing performance in critical directions while significantly reducing overall computational cost.
Solution Approach 2:
The patent implements dynamics by making the ray tracing configuration adaptive and changeable based on runtime conditions. The system dynamically adjusts which directions to trace based on statistics from previous frames, allowing the ray tracing behavior to evolve and adapt rather than remaining static. This dynamic approach ensures that computational resources are always allocated to the most relevant directions, maintaining performance while reducing waste.
2Measurement precision
If bounding volume hierarchy (BVH) structures are rebuilt frequently to maintain quality, then ray tracing accuracy is improved, but processing time and computational overhead increase
Solution Approach 1:
The patent applies preliminary action by using statistics from previous frames to pre-determine the optimal directions for ray tracing before actually performing the ray tracing operation. This preliminary analysis allows the system to prepare the BVH reconstruction in advance with knowledge of which directions are most important, ensuring high quality BVH structures are built efficiently without unnecessary processing time spent on less relevant directions.
Solution Approach 2:
The patent implements parameter changes by modifying the BVH construction parameters based on directional statistics. Instead of using fixed parameters for BVH rebuilding, the system adjusts parameters dynamically according to the identified important directions, allowing optimal BVH quality to be achieved with reduced processing time by focusing computational effort on the most impactful parameters.
3Reliability
If comprehensive ray tracing is performed to handle updateable geometry, then rendering accuracy is improved, but power consumption and processing cycles increase
Solution Approach 1:
The patent applies the taking out principle by extracting and isolating only the essential directional information needed for accurate rendering of updateable geometry. Instead of performing comprehensive ray tracing in all directions, the system extracts the specific directional statistics from previous frames and uses only that extracted information to guide current ray tracing operations. This extraction approach maintains rendering accuracy for dynamic geometry while eliminating energy waste from tracing unnecessary directions.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for adaptive BVH rebuilds with biased cost functions for dynamic geometry. A graphics processor may obtain an indication of first BVH structure(s) including first nodes, where the first BVH structure(s) are representative of first geometry data for first primitives in first frame(s), where each of the first nodes is associated with first primitive(s), may detect a number of rays that intersect each of the first BVH structure(s) from direction(s) associated with the first frame(s), may update a cost function based on the number of rays and each of the direction(s), and may configure, based on the updated cost function, second BVH structure(s) including second nodes, where the second BVH structure(s) are representative of second geometry data for second primitives in second frame(s), where each of the second nodes is associated with second primitive(s).