Whether you need more than just the buttock will depend on the morph you are creating. If it only changes the geometry within that one part then that one part is all thats needed. Of course if you have a larger section of the model in Rhino then it may be easier to see the overall effect. You will also need to get the OBJtoRTM utility from freestuff as Rhino (v2) has no native import of OBJ files, although it can export them. -- Mark

Mark