Transparency
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[hide]Additive Transparency
The flames on this burning bed are using additive transparency to keep the colors "hot."
See additive color model.
Alpha Transparency
Alpha Bit Depths
Subtractive Transparency
The x-rays on this light-table use subtractive transparency to make things under them darker, the way real x-rays do. The subtractive method isn't used all that often, so if you need it you should ask your programmer(s) if they can add it as a specific feature of the engine.