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Personally, I have only needed to do this during runtime. I'm sure if you email the good folks at Allegorithmic they would be happy to help you...
You could try:
I seem to have found an import problem in substance designer. If you look at the following attachment you will see that a simple cube with a...
This just came out for $15: http://u3d.as/content/master-rey/3dthrough/369