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Opacity based on distance to camera redux
There’s this standard opacity expression. It’s great for getting things to fade off into the distance.
But what if I wanted it to also fade as layers moves toward the camera also? So there’s this sweet spot zone of where layers are at full opacity — the things behind are fading into the distance, the things in front fade off too, but have a more rapid falloff
startFade = 500; // Start fade 500 pixels from camera.
endFade = 1500; // End fade 1500 pixels from camera.
try{ // Check whether there’s a camera.
C = thisComp.activeCamera.toWorld([0,0,0]);
}catch(err){ // No camera, so assume 50mm.
w = thisComp.width * thisComp.pixelAspect;
z = (w/2)/Math.tan(degreesToRadians(19.799));
C = [0,0,-z];
}
P = toWorld(anchorPoint);
d = length(C,P);
linear(d,startFade,endFade,100,0) -
3 Replies
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This should work:
startInnerFade = 100;
endInnerFade = 50;
startOuterFade = 500;
endOuterFade = 1500;try{ // Check whether there’s a camera.
C = thisComp.activeCamera.toWorld([0,0,0]);
}catch(err){ // No camera, so assume 50mm.
w = thisComp.width * thisComp.pixelAspect;
z = (w/2)/Math.tan(degreesToRadians(19.799));
C = [thisComp.width/2,thisComp.height/2,-z];
}
P = toWorld(anchorPoint);
d = length(C,P);
if (d > (startInnerFade+startOuterFade)/2)
linear(d,startOuterFade,endOuterFade,100,0)
else
linear(d,endInnerFade,startInnerFade,0,100)BTW there was an error (probably mine) in the expression you posted, which I have corrected here.
Dan
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Brilliant as always! Thank you! …and you might want to check your email 😉
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Thank you–I appreciate it!
Dan
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