Nobody can restrict a discusion about the contents of a text file, there's no reverse engineering here. If you read backface cull it means not to render backward oriented faces (faster rendering of closed objects without holes). How is done? : testing the face normal (public knowledge). The code used by Poser5 for doing this? : This is propietary of CL, if you want to know it you must do reverse engineering and probably will be illegal.

Stupidity also evolves!