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AM_TRANSPERENT is the material used for ghosts; it causes bugs. In general, creating semi-transparent units is a masochistic endeavor. I tried it once, and it was all driven by pure curiosity – I was interested in why the hand textures would appear on top of the sleeves and how to fix it. Once I figured it out, I created three ghost units from the test unit and abandoned the project for many years. Now I don't remember anything and don't want to start over.