There is no documentation that i know of relating to 3D objects in catalyst.
You need to create your object in an external application like 3D Studio Max or similar - this is the clever bit as it idefines how the video is mapped over the object.
Then import the object in to catalyst:
Create a folder called 'Models' in the same folder as the application.
Name your model files using 3 digit numbers like movie files.
000Model1XXX.obj
001Model2YYY.obj
You can either use it within a mix - or on a layer if you need more controls than the mix offers...
check these 2 posts too:
http://chaldee1.gotadsl.co.uk/~richa...hlight=objects
http://chaldee1.gotadsl.co.uk/~richa...hlight=objects
Hope this helps...
S