I'm mildly proficient in CAD and attempting to do something which may be a bit over my head. I work in the entertainment industry and I get 2D plans from promoters/venues/eventcompanies, etc....What I need to do is extrude these plan views so that I can place my sound, lighting and video gear into a 3D environment and show the client what the finished product will look like. Does anyone know of some existing resources that I can study to learn the issues with 2D to 3D extrusion? Any information will help. Thanks!