Adding back presets folders not previously moved with the extension platform repository change, and using their newer registration process... This will need more fixing later, but regression is smaller that way.
Persistence Of Vision is an SDL (Scene Description Language) for 3D rendering engines, not that different from what USD is to the Renderman community. With a long history that makes it very stable and feature rich, its main engine has 64 bits multi-threading at heart, subsurface scattering, stochastic quasi Monte-Carlo sampling, depth of field, real time mode… Latest version of the Persistence of Vision renderer can be found at: http://www.povray.org/download/