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Aqsis - Free high quality, photorealistic, Renderman™ based 3D renderer
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Aqsis is a free high quality, photorealistic, 3D renderer. It complies with the Renderman® interface standard defined by Pixar.
Aqsis is a command line tool for generating high quality 3D images which you would normally use as a plugin for a 3D modelling package such as K-3D