Do you want to import them to 3d rad? If you want, the way I used when I used 3d rad was: I export the model as .dae. Then, I import the models in Sketchup and then I export them as Skinmeshes or RigidBodies and I have them in 3d rad. It will give it as an .x file. I hope you found that helpful. Forgot to tell you that you need 3d rad exporter.