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Opacity expression linked to QuickTime. PLEASE HELP
I have 2 3D layers on a comp with a camera looking at them.
One 3D solid is masked out to be lit up by a pink light. In front of it is a QuickTime masked out to look like an old TV. The solid is acting like the ground, the pink light is acting like the TV brightness.
How do I make the opacity of the solid react to the brightness of the TV through an expression. I can’t link it to the light b/c I don’t have anything free to add an expression to. Everything is being used. All I have is the opacity of the solid. I tried adding Levels to the QT, but the Opacity expression won’t link to the Histogram.
Thanks!
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2 Replies
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You could link the opacity of your solid to the brightness of your QT movie using sampleImage(), like this:
L = thisComp.layer(“Your QT Movie”);
rgba = L.sampleImage([L.width,L.height]/2,[L.width,L.height]/2,true);
rgbToHsl(rgba)[2]*100I would think though, you might have better luck linking the brightness of the pink light to the brightness of the movie in a similar way.
Dan
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That worked, thanks!
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