从学生的aqsis团队谷歌代码之夏2007工作代码示例。

Aqsis is a GPL/LGPL cross-platform photo-realistic 3D rendering solution, based on the RenderMan interface standard defined by Pixar Animation Studios. Its focus is on stability and production usage with features that include constructive solid geometry, depth-of-field, extensible shading engine (DSOs), instancing, level-of-detail, motion blur, NURBS, procedural plugins, programmable shading, subdivision surfaces, subpixel displacements and more. We have a good working relationship with other notable open source projects, such as Blender, K-3D, LiquidMaya and MakeHuman.

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filter_alg.pdf
README
source
TransmittanceFilteringAlg.pdf