Ray Intersection Testing With Multi-Precision Retesting
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Solution Overview
Problem
Existing ray tracing systems face inefficiencies in intersection testing due to the use of lower precision testers that can lead to false positives, increasing unnecessary computational load and hardware costs without improving performance.
Innovation Solution
Implement a ray tracing system that performs initial intersection testing at a lower precision level, conservatively classifying results as 'definite miss' or 'may be hit', with 'may be hits' retested at higher precision, and optionally classifying as 'confident hit' or 'may be hit' based on proximity to the silhouette edge, reducing unnecessary retesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lower precision testers are used for intersection testing, then hardware area and computational load are reduced, but false positives increase leading to unnecessary retesting
Solution Approach 1:
The intersection testing process is segmented into two distinct stages: a first stage using lower precision testers to perform initial filtering, and a second stage using higher precision testers to verify potential intersections. This segmentation allows the system to benefit from both low precision (reduced hardware area) and high precision (accurate results) by applying each at the appropriate stage of the testing process.
Solution Approach 2:
A packet management system acts as an intermediary between the lower precision and higher precision testers. The packet manages rays that require retesting, storing them for subsequent processing by higher precision testers. This intermediary component coordinates the flow of data between different precision levels, ensuring that only rays with potential intersections (those that may have false positives) are subjected to costly high precision retesting.
2Productivity
If lower precision testers are used for intersection testing, then computational load is reduced, but unnecessary retesting increases
Solution Approach 1:
The testing process is divided into segments with different computational requirements. The first stage uses computationally efficient lower precision testers for bulk processing, while the second stage uses more computationally intensive higher precision testers only on a small subset of rays that require verification. This segmentation minimizes overall computational load while maintaining accuracy.
Solution Approach 2:
Instead of applying high precision testing to all rays (excessive action), the system applies it only partially to rays that potentially require verification. The lower precision testers handle the majority of rays efficiently, and only rays with ambiguous results are subjected to the additional computational cost of high precision retesting.
3Measurement precision
If higher precision testers are used for all intersection testing, then accuracy is improved, but hardware area and computational load increase
Solution Approach 1:
Different precision levels are applied locally to different stages of the testing process rather than uniformly across all testing. Lower precision is used locally in the first stage where high accuracy is less critical, and higher precision is used locally in the second stage where accuracy is paramount. This local quality approach optimizes the balance between hardware requirements and testing accuracy.
Solution Approach 2:
High precision testing is applied partially rather than excessively to all rays. The system uses high precision testers only when necessary (for rays that potentially intersect volumes based on low precision testing), avoiding the hardware overhead of universally deploying high precision testers for every intersection test.
4Reliability
If higher precision testers are used for all intersection testing, then false positives are reduced, but computational load increases
Solution Approach 1:
The computational process is segmented into two phases: a fast initial filtering phase using lower precision testers that handles the bulk of rays efficiently, and a slower verification phase using higher precision testers that handles only the small subset of rays requiring accurate verification. This segmentation maintains high reliability while preserving computational efficiency.
Solution Approach 2:
High precision testing is applied partially to only those rays that need it, rather than excessively applying it to all rays. The lower precision testers handle the majority of cases efficiently, and high precision testers are invoked only when the lower precision results are inconclusive or potentially incorrect.
Data Source
AI summary
A ray-tracing system for performing intersection testing includes a tester module for testing rays for intersection with a volume, the tester module receiving a packet of one or more rays to be tested for intersection with the volume. A first set of one or more testers performs intersection testing at a first level of precision to provide intersection testing results, wherein for a first type of the intersection testing result from the first set of one or more testers intersection testing does not need to be reperformed at a second level of precision greater than the first level of precision, and for a second type of the intersection testing result from the first set of one or more testers intersection testing is to be reperformed at the second level of precision; and a second set of one or more testers configured to perform intersection testing at the second level of precision. The tester module allocates a ray from a received packet to one of the first set of testers for intersection testing at the first level of precision; identifies the type of an intersection testing result for the ray provided by one of the first set of testers to determine whether intersection testing for the ray is to be reperformed at the second level of precision. If it is determined that intersection testing for the ray is to be reperformed at the second level of precision, the ray is allocated to one of the second set of testers for intersection testing at the second level of precision.