Blend video projectors using 'multiply' rather than 'additive' mode
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 Is it possible to blend two or more videos together using a 'multiply' blending mode. The projector just has transparency or additive but I'm wanting the white parts of the top image to be transparent only as in 'multiply'. I see it's available in the Effect Mixer actor (mode: mult) but I'm wanting to have more than two videos overlapping with this mode. Any ideas?