3ds max, viz SOFTIMAGE|XSI Real3D V-ray Lightwave 3D Maya, paint FX Terragen Vue d'Esprit AccuRender Brazil R/S Final Render Shake Vue 4 Pro Discreet Combustion and Inferno Alias ImageStudio Blender sasquatch Messiah studio Gaffer Bryce Hash Animation Master Pixels 3D studio Carrara Flamingo Strata 3D Pov-ray/megapov Mojoworld Ray Dream Studio Table 2: Rendering software or tools. The column partitioning has no sig- nificance but just for compact display of information. 4.1   Rendering Information of PRCG Out of the 800 PRCG, 280 of them does not have any associated rendering information, the remaining 520 images has rendering information of various extent; some images contain a more complete rendering description while some contain a very mininal information of only the rendering software used. The rendering information includes the rendering software, the geometric modeling techniques, the rendering techniques, and the post-rendering pro- cessing.  The information is extracted from the description of the PRCG found at the original webpage. Table 2 lists the rendering software or tools used in the PRCG set. Most of them are the commercial computer graphics rendering software. Table 3 lists the geometric modeling software or tools used in the  PRCG  set and Table 4 lists the software used for the post-rendering image composition or for the creation of image texture. Finally, Table 5 lists the geometric mod- eling and the rendering techniques, where many of them are for producing high-photorealistic rendering effects. 4.2   Content Category of PRCG The PRCG are categorized into the following content categories: 1.  arch - images of building, architectural structure or building interior. 11