Also an interseting app. is 3D PaintBrush (99,- € online from Germany)

http://www.3dpaintbrush.com/

•Import models from SketchUp, Rhino, 3DS, Autocad, STEP, IGES & OBJ files
•Capture 3D models from any graphics application running on your computer
•Drag and Drop Materials, Lights, Backgrounds and Animations
•Import images and apply them as textures and backgrounds
•Manipulate material properties like Diffuse and Specular color, transparency and shininess in real time
•Visualize and position lights in the scene as well as modify light properties like colour and direction. Modifications are reflected in the Graphics Area in real time
•Animate camera, material and position of components to create key frame animations
•Use Ray Tracing for exporting photo-realistic images from your 3D scene
•Export to 3D PDF
•Export to EXE (Executable format)
•Export to popular image formats like BMP, JPG, PNG, TIFF & GIF
•Export to 3DS, XAML, OBJ & SVG
•Export animations to Shockwave Flash (*.SWF) and Microsoft AVI (*.AVI)

It`s a product of Geometric...