Ray-Bounding Volume Intersection for Early Hit Confirmation
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Solution Overview
Problem
Existing ray tracing systems face inefficiencies in intersection testing due to the need to traverse acceleration structures deeply to determine intersections, especially in complex scenes with many objects, leading to increased computational effort and power consumption.
Innovation Solution
The method involves determining whether a ray intersects an object by testing against bounding volumes, allowing intersection determination without reaching leaf nodes, using conservative hit tests based on bounding regions to reduce the number of intersection tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ray tracing systems traverse acceleration structures deeply to determine intersections, then intersection testing accuracy is improved, but computational effort and power consumption increase
Solution Approach 1:
The patent applies partial action by implementing conservative hit tests that determine intersection existence without completing full traversal to leaf nodes. The system performs bounded intersection tests against bounding volumes at intermediate levels of the acceleration structure, obtaining sufficient precision for many applications without the excessive computational cost of complete traversal. This allows the system to stop early when intersection existence is confirmed, reducing power consumption while maintaining adequate accuracy.
2Productivity
If ray tracing systems perform conservative hit tests against bounding volumes, then the number of intersection tests is reduced, but intersection testing precision may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the acceleration structure into bounding volume hierarchies and performing conservative hit tests at multiple levels. Instead of treating the entire scene as one unit, the system segments space into hierarchical bounding volumes and performs partial intersection tests at intermediate segments. This allows early termination when intersections are confirmed, improving efficiency while maintaining precision through multi-level verification.
Solution Approach 2:
The patent uses bounding volumes as intermediary objects between rays and final intersection targets. These bounding volumes serve as mediators that provide conservative approximation of intersection existence without requiring precise primitive-level testing. The intermediary bounding volume tests filter out non-intersecting rays early while preserving candidate rays for more precise testing, thus improving overall efficiency without sacrificing accuracy.
3Reliability
If ray tracing systems traverse to leaf nodes to determine intersections, then precise object intersection is confirmed, but computational effort increases
Solution Approach 1:
The patent applies partial action by performing bounded intersection tests that confirm intersection existence without requiring complete traversal to leaf nodes. The conservative hit tests against bounding volumes provide sufficient reliability for determining whether intersections exist, eliminating the need for excessive traversal in cases where intersection presence is adequately confirmed at intermediate levels.
Data Source
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AI summary
Object intersection testing in a ray tracing system. There is provided a method of determining, in a ray tracing system, whether a ray intersects an object of a scene, wherein the object comprises a surface, and wherein at least a portion of the surface of the object is contained within a bounding volume. The method comprises determining that the ray intersects the bounding volume at two intersection points, wherein the two intersection points represent an entry point and an exit point; determining that the entry point and the exit point lie on opposing faces of the bounding volume, wherein the opposing faces of the bounding volume are arranged on opposing sides of the portion of the surface of the object contained within the bounding volume; and determining whether the ray intersects the object at least in dependence on determining that the entry point and the exit point lie on opposing faces of the bounding volume.