If I use a black & white only transparency map to, for example, chop away a piece of garment, the sketch renderer appears to render the whole garment at the highest transparency. i.e. a garment that is visible and opaque in a normal render but has a couple of holes cut out of it, becomes entirely transparent in the sketch renderer. Is there some way around this problem? Am I missing something? Is it a bug? regards and TIA for any help you might be able to offer.