Stencil Mapped Shadowing for Ray Tracing
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Solution Overview
Problem
Current ray tracing technologies face challenges in load balancing, high processing costs due to acceleration structures, and excessive intersection tests, which hinder efficient rendering of large scenes and power consumption, especially in battery-powered devices like smartphones and laptops.
Innovation Solution
The method employs a uniform grid of cells with stencil maps that cache relevant scene data locally, eliminating the need for acceleration structures and reducing intersection tests, allowing for efficient parallel processing and improved load balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acceleration structures are used for ray tracing, then intersection tests can be performed, but processing cost and construction time increase significantly
Solution Approach 1:
The scene is divided into a uniform grid of cells, with each cell maintaining a stencil map that stores only the geometric data relevant to that cell. This segmentation eliminates the need for global acceleration structures while enabling localized intersection tests within each cell, reducing both construction time and processing cost.
Solution Approach 2:
Each cell in the uniform grid has its own stencil map containing only the geometric data necessary for shadowing calculations in that specific cell. This local quality approach ensures that each processor working on a cell has access to only the data it needs, minimizing memory access overhead and eliminating the need for complex global acceleration structures.
2Productivity
If uniform grid of cells with stencil maps is used, then processing efficiency improves, but data distribution complexity increases
Solution Approach 1:
The uniform grid structure serves multiple functions simultaneously: it provides spatial organization for scene data, defines processor work domains, and organizes stencil map storage. This multi-functionality simplifies data distribution compared to complex hierarchical structures while maintaining high rendering efficiency through localized processing.
Data Source
AI summary
Aspects comprise shadowing method as part of ray tracing. It is based on uniform grid of cells, and on local stencils in cells. The acceleration structures are abandoned along with high traversal and construction costs of these structures. The amount of intersection tests is cut down. The stencils are generated in the preprocessing stage and utilized in runtime. The relevant part of scene data, critical for shadowing of all visible intersection points in a cell, is registered in the local stencil map, as a volumetric data. The runtime use of stencils allows a complete locality at each cell, enhanced utilization of processing resources and load balancing of parallel processing.