-
Expression for 3D rotation to value
I’m trying to adjust the intensity of a flare based on how far away from straight at the camera a light is pointing.
Anyone know an expression to get a value from an x/y/z orientation into a single number?
i.e. A light pointing straight at the camera is at (0,0,0) which give a value of 100 (or whatever), where the same light pointed at (90,90,0) would give a value of 0. Then I can use this to adjust the brightness of a flare based on the lights angle.
Thanks,
Matthew Reithmayr
doulosmedia.comreplied 13 years, 1 month ago 2 Members · 1 Reply
-
1 Reply
-
Try this:
C = thisComp.layer(“Camera 1”);
L = thisComp.layer(“Light 1”);
v1 = C.toWorldVec([0,0,1]);
v2 = L.toWorldVec([0,0,-1]);
Math.max(dot(v1,v2)*100,0)Dan
Reply to this Discussion! Login or Sign Up