Bounding Volume Hierarchy Compression via Node Inheritance
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Solution Overview
Problem
The large size of bounding volume hierarchies in computer graphics rendering limits their storage in local memory, leading to inefficiencies due to long latency access to backing stores, while reducing model complexity to fit within memory constraints decreases rendering quality.
Innovation Solution
A method for compressing bounding volume hierarchies by encoding each node to indicate whether it inherits values from a parent node, reducing the number of stored coordinates and using variable-length node structures, along with approximating coordinate values to minimize memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bounding volume hierarchy is stored in local memory, then rendering speed is improved, but the model size is limited by memory capacity
Solution Approach 1:
The bounding volume hierarchy data is segmented into variable-length node structures where each node only stores the coordinates it uniquely defines. Nodes inherit coordinates from parent nodes when applicable, dividing the complete bounding volume data into minimal necessary segments across the hierarchy tree.
Solution Approach 2:
The patent introduces a new dimension of data organization by adding inheritance information to each node, transforming the traditional fixed-structure bounding volume data into a hierarchical inheritance structure that reduces redundant coordinate storage across multiple levels of the tree.
2Volume of stationary object
If the bounding volume hierarchy is compressed to fit in local memory, then memory usage is reduced, but rendering accuracy may deteriorate
Solution Approach 1:
The patent performs preliminary organization of bounding volume data during the compression phase, structuring nodes to inherit coordinates from parents when possible. This preliminary structuring enables efficient storage without requiring approximation or loss of precision, as the inheritance structure naturally captures the hierarchical relationships needed for accurate rendering.
3Manufacturing precision
If all coordinates are stored for each node, then rendering accuracy is maintained, but memory consumption increases
Solution Approach 1:
The patent extracts redundant coordinate information from child nodes when those coordinates can be inherited from parent nodes. Instead of storing complete coordinate sets for every node, the system extracts only the unique coordinate information needed at each node level, significantly reducing memory consumption while preserving rendering accuracy.
Solution Approach 2:
Parent node coordinates serve multiple functions by being inherited by multiple child nodes. A single set of coordinates stored in a parent node can define bounding volume boundaries for multiple descendant nodes, making the coordinate data universal across the hierarchy and eliminating redundant storage.
Data Source
AI summary
A system, method, and computer program product for compressing a bounding volume hierarchy is disclosed. The method includes the steps of receiving a bounding volume hierarchy and encoding the bounding volume hierarchy to generate an encoded bounding volume hierarchy, wherein each node in the encoded bounding volume hierarchy indicates whether the node inherits zero or more values from a parent node. The bounding volume hierarchy includes a plurality of nodes, each node in the plurality of nodes is associated with a bounding volume.