check if a layer is outside the camera area

Question

Hi, is there any way to check if a layer is outside the camera area ?exampleif(ouside){opacity=100}else {opacity=0}Thank !!!

Dan Ebberts · Accepted Answer

Depending on what you're doing, variable visible should be true if any of the bounding rectangle of your target layer appears within the camera view:

L = thisComp.layer("Target Layer");
w = thisComp.width;
h = thisComp.height;
r = L.sourceRectAtTime(time,false);
ul = L.toComp([r.left,r.top]);
ur = L.toComp([r.left+r.width,r.top]);
ll = L.toComp([r.left,r.top+r.height]);
lr = L.toComp([r.left+r.width,r.top+r.height]);
visible = ((ul[0] >=0 && ul[0] <= w) && (ul[1] >=0 && ul[1] <= h)) ||
((ur[0] >=0 && ur[0] <= w) && (ur[1] >=0 && ur[1] <= h)) ||
((ll[0] >=0 && ll[0] <= w) && (ll[1] >=0 && ll[1] <= h)) ||
((lr[0] >=0 && lr[0] <= w) && (lr[1] >=0 && lr[1] <= h));

Rick Gerard · Answer

It would not be a simple expression. With a 2-node camera, you would need to include the Point of Interest, the Zoom value, the distance from the camera, and the layer width combined with the Anchor Point. You would also have to throw in the angles for a one-node camera. You should also probably compensate for scale.

The basic math would be as follows:

Calculate the distance from the camera and the distance from the center of the camera's view. Factor in the Zoom (angle of view) layer size multiplied by scale and a couple of other things.

I have animation presets that put a 2D layer just outside the composition boundary, move it into position based on in-point and timing sliders, and then move the layer out of the frame based on out-point. I have thought about modifying them to work with 3D layers but have never taken the time to do so.

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