I recently worked with a guy who’s brother is developing a 3D app. I checked it out and thought it worth passing along to the group. The app is java based and will run on multiple platforms. I have found the user interface fairly easy to learn and according to the documentation, it has a global illumination style renderer with depth of field.
It imports and exports obj files and has a procedural texturer editor.
Here is an image from the gallery by Julian MacDonald