I have a multilayer drawing of a machine part, and I want to include a 3D rendering of the part. Everytime that I try to render the object, all layers except the one that I am rendering disappear. This happens with Open GL and Renderworks, but not with the Polygon rendering. However, I want to use Open GL or Renderworks for this task. Putting all the information from the various layers onto one sheet would work, but that's not practical for my work. Help.