Re: Random layer position constrained by another layer's alpha

This seems to work for 2D. I'm not sure how you have your 2.5 D set up, but you should be able to do something similar.

L = thisComp.layer("island");
seedRandom(index,true);
P = L.transform.position;
offset = [L.width,L.height]/2;
minPos = P - offset;
maxPos = P + offset;

while(true){
pos = random(minPos, maxPos);
if (L.sampleImage(L.fromWorld(pos), [.5, .5], true, time)[3] > 0) break;
}
pos


Dan