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function lookAtMe(fromPt, toPt){
lkAt = lookAt(fromPt, toPt);
if (toPt[1] > fromPt[1]){
return 180-lkAt[1];
} else {
return lkAt[1];
}
}
//implement the function
p0= transform.position; //look from point
p1=thisComp.layer("some other layer").transform.position; //looked-at point
lookAtMe(p0, p1)