There are definitely a number of topics on the subject but they can be hard to wade through. Documentation on this subject will be much better when we ship. For now there are a couple major things to check.
First, make sure the textures you're using in Maya are not procedurals. If they are they won't translate into an exported OBJ to *any* program, TG2 or otherwise. If Maya has a method of rasterizing textures for export then you can use that.
Second, load the OBJ in any other 3D program you might have to make sure it's a TG2 problem and not just a general OBJ export issue.
Blender is free, or you can try
Poseray (also useful for other purposes, see below) or
Meshlab. If the object loads and looks ok (with textures) in another app then you definitely know it's a TG2 problem.
Next try opening the .mtl file with a text editor, something like like Notepad (Windows) will work fine, or use the editor of your choice. If no .mtl file is exported with the OBJ then that's the reason for the lack of textures and no other app will probably show textures either (unless it supports texture embedded OBJ's which I *think* is an obscure and seldom used feature). In the .mtl file you should see references to 1 or more UV map areas and associated texture image files. If there are no image file paths in the .mtl then it is not being exported correctly from Maya or the textures aren't image based to begin with and are thus not able to be exported (see point 1). If there are paths to images then it is probably working correctly and may just take a little tuning.
If the paths were in the .mtl file but the textures were stored in a folder other than where the OBJ is, try copying the textures into the exported OBJ folder and re-export from Maya, or edit the .mtl manually to point to the new location.
You can also try loading the object in Poseray and re-exporting. Poseray seems to have one of the better (or at least more compatible) OBJ export systems out there. You may need to do some more advanced material assignment/reassignment in Poseray - search for "poseray" in the forums and you should get instructions on that.
Finally you can try exporting a simple, smaller model and post it here so others can test and help you diagnose.
OBJ loading is still not as simple and problem-free as it could be but more often than not with the newer versions the problem lies somewhere in-between the modeler and TG2, not necessarily in TG2 itself.
- Oshyan
