Bounding Volume Hierarchy for Real-Time Navigation and Raytracing
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Solution Overview
Problem
Raytracing techniques are computationally intensive and lead to high latency, making them unsuitable for real-time applications like virtual reality, where low latency is crucial for immersive visuals, and existing bounding volume structures are inefficient for navigation and path planning.
Innovation Solution
The use of a bounding volume hierarchy (BVH) for both graphics rendering and path planning, allowing for efficient raytracing and navigation by reducing the number of intersection tests and leveraging hardware support for raytracing and BVH traversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If raytracing techniques are used to generate realistic images, then visual realism is improved, but rendering latency increases to unacceptable levels
Solution Approach 1:
The patent segments the scene into multiple bounding volumes organized in a hierarchical structure (BVH), dividing the continuous space into discrete, manageable regions. This segmentation allows the rendering system to process only relevant portions of the scene, reducing the computational burden of full raytracing while maintaining visual realism in critical areas.
Solution Approach 2:
The patent introduces bounding volumes as intermediary structures between the raytracing algorithm and the actual scene geometry. These bounding volumes act as proxies that approximate object shapes, allowing rapid rejection of rays that would not intersect with actual objects. This intermediary layer significantly reduces the number of precise intersection tests needed, lowering latency while preserving visual quality.
2Productivity
If bounding volumes are used to represent groups of objects, then the number of intersection tests is reduced, but the challenge of defining an appropriate bounding volume structure increases complexity
Solution Approach 1:
The patent implements a nested bounding volume hierarchy where larger bounding volumes contain smaller ones, which in turn contain even smaller volumes. This nested structure organizes objects at multiple levels of detail, allowing the renderer to quickly eliminate large regions and progressively focus on smaller, more relevant areas. The nesting principle reduces complexity by providing a systematic, hierarchical organization rather than requiring complex individual bounding volume definitions for each object.
Solution Approach 2:
The patent performs preliminary organization of objects into bounding volumes before the actual raytracing process. By pre-computing and storing the hierarchical bounding volume structure, the system prepares the scene data in advance, allowing rapid traversal during rendering without adding complexity to the core raytracing algorithm. This preliminary action separates the complexity of structure definition from the rendering execution.
3Productivity
If traditional bounding volume structures are used, then raytracing efficiency is improved, but navigation and path planning remain inefficient
Solution Approach 1:
The patent creates a universal bounding volume hierarchy that serves multiple functions simultaneously: it enables efficient raytracing for rendering and provides a navigation graph for path planning. The same hierarchical structure that optimizes visual rendering also facilitates navigation queries, allowing agents to traverse the scene by moving between bounding volumes. This multi-functionality eliminates the need for separate navigation data structures, improving both rendering efficiency and navigation ease.
Data Source
AI summary
A system for generating a path for navigating an environment, the system comprising a bounding volume hierarchy, BVH, generation unit operable to generate a BVH comprising a plurality of bounding volumes representing one or more objects in the environment, a BVH analysis unit operable to identify information about the geometry of the environment from the BVH, and a path planning unit operable to generate a path through the environment in dependence upon the identified geometry.