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Opacity based on distance from Camera: multiple nested compositions
I have three comps, each nested in the previous:
MASTER > Scene1 > SongsRow1
Inside SongsRow1, there is a layer called “test” that I’d like to fade out as it pulls a certain distance away from the camera.
I am having trouble using “toWorld” to navigate all these nested comps… I’m still not 100% clear on how “toWorld” works. This is what I have (in the opacity field of layer “test”):
startFade = thisComp.layer("controls").effect("startfade")("Slider");
endFade = thisComp.layer("controls").effect("endfade")("Slider");
C = comp("MASTER").activeCamera.toWorld([0,0,0]);
P = comp("MASTER").layer("Scene1").toWorld(comp("Scene1").layer("SongsRow1").toWorld(thisComp.layer("test").anchorPoint)); // This is where the problem is, I think
d = length(C,P);
linear(d,startFade,endFade,100,0)Thanks!
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5 Replies
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I think it’s easier to do each transform as a separate step. I haven’t tested this, but I’d try it this way:
startFade = thisComp.layer(“controls”).effect(“startfade”)(“Slider”);
endFade = thisComp.layer(“controls”).effect(“endfade”)(“Slider”);
C = comp(“MASTER”).activeCamera.toWorld([0,0,0]);
P1 = toWorld(anchorPoint); // convert test postion to SongsRow1 world space
L2 = comp(“Scene1”).layer(“SongsRow1”);
P2 = L2.toWorld(P1); // convert P1 to Scene1 world space
L3 = comp(“MASTER”).layer(“Scene1”);
P3 = L3.toWorld(P2); // convert P2 to MASTER world space
d = length(C,P3);
linear(d,startFade,endFade,100,0)Dan
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Hey Dan, first, thanks for your help!
Does your code account for if one of the parent compositions are moving? I tried it and I’m getting a result, but “d” only wiggles between 520 and 560 (due to a wiggle in the camera position), where in actuality that value should move from 0 to 10,000, because “SongsRow1” is moving further and further away from the camera..
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It should. Are all of your “Collapse Transformation” switches turned on?
Dan
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yes they are…
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OK – I just set up the three nested comps and it seems to work fine for me. I can go into any of the comps and move the nested, collapsed 3D layer around and the text fades in and out. I really don’t know why it doesn’t work for you.
Dan
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