Corel Dream 3D is identical to RayDream 3D with the following exception: no animation capability. It's a 3D modeller and scene arranger that's very much like RayDream Studio 5.5 without the mesh form modeller or deformers. I used RD3D for a year or so before I got RDS and found it to be a very powerful package. If you're not planning on doing animation, Corel Dream is very effective.