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Summary: / 1 1
VoxelOcclusionTesting:A ShadowDetermination
Acceleratorfor RaYTracing
AndrewWoo'i
JohnAmanatidesf
Departmentof ComputerScience
Universiryof Toronto
Toronto, Ontario
M5S 1A4
1. Abstract
A shadowdeterminationacceleratorfor ray tracing is
presented.It is built on top of the uniform voxel traversal
grid sfucture. The acceleratorproves to be ratherefficient'
requires little additionai memory and the worst case scenarlo
per shadow determination just reduces down to traditional
voxel traversal.It can alsobe extendedto model linear, area
lights, aswell asatrnosphericshadows.
Keywords: grid, intersection culling, occlusion, penumbra,
ray tracing,shadows,umbra,voxel traversal.
2. Introduction
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