Orientation lightmaps for photon tracing in complex environments

We present a method that makes the use of photon tracing methods feasible for complex scenes when a totally accurate solution is not essential. This is accomplished by using orientation lightmaps, which average the illumination of complex objects depending on the surface normal. Through this averagi...

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Bibliographic Details
Published in:The Visual computer 2001-06, Vol.17 (5), p.318-327
Main Authors: Wilkie, Alexander, Tobler, Robert F., Purgathofer, Werner
Format: Article
Language:English
Subjects:
Algorithms
Photons
Tracing
Online Access:Get full text
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Summary:We present a method that makes the use of photon tracing methods feasible for complex scenes when a totally accurate solution is not essential. This is accomplished by using orientation lightmaps, which average the illumination of complex objects depending on the surface normal. Through this averaging, they considerably reduce the variance of the stochastic solution. In order to use these specialised lightmaps, which consume comparatively small amounts of memory, no changes have to be made to the basic photon-tracing algorithm. Also, they can be freely mixed with normal lightmaps. This gives the user good control over the amount of inaccuracy he introduces by their application. The area computations necessary for their insertion are performed using a stochastic sampling method that performs well for highly complex objects.
ISSN:0178-2789
1432-8726
1432-2315
DOI:10.1007/s003710100101