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Absolute Camera Position, Orientation, and Rotation
I have a 3D model rendered with Superluminal’s Stardust plugin (works kind of like Element 3D). The problem is I need to precomp this layer, but I want to link the camera in the precomp to the camera in the main comp, so as I move the main comp camera, the model moves accordingly. One more twist is that my main comp camera is parented to a null, which is parented to another null (for separate X and Y orbit moves). I can’t seem to find the correct expressions, especially for the Orientation and Rotation properties. Ideally I’d like to have the camera in the precomp not be parented to anything, so the expression just references the active camera in the main comp which may not have this parented structure. Right now I’m using “One-Node” cameras.
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2 Replies
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Try this for the precomp camera’s orientation:
L = comp("Main Comp").layer("Camera 1");
u = (L.toWorldVec([1,0,0]));
v = (L.toWorldVec([0,1,0]));
w = normalize(L.toWorldVec([0,0,1]));
sinb = clamp(w[0],-1,1);
b = Math.asin(sinb);
cosb = Math.cos(b);
if (Math.abs(cosb) > .0005){
c = -Math.atan2(v[0],u[0]);
a = -Math.atan2(w[1],w[2]);
}else{
a = (sinb < 0 ? -1 : 1)*Math.atan2(u[1],v[1]);
c = 0;
}
[radiansToDegrees(a),radiansToDegrees(b),radiansToDegrees(c)]
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Thank you, Dan! This works great! I initially thought I still needed to have the X, Y, and Z Rotation properties of the cameras linked, but that is not the case! The Orientation expression takes care of it all ?
If anyone else is trying to do this, here is my simple expression for the Position:
comp("Main Comp").layer("Camera 1").toWorld([0,0,0])
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