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Convert a 3D position to 2D position *and scale*
Hi !
.toComp() will give me the 2D position of a 3D layer. But what if that 3D layer also has its Z position animated and I wanted to translate this to 2D position and Scale, so the resulting 2D layer appears to sit perfectly where the 3D layer is?
In other words:
If 3D position [500,400,0] = 2D position [500,400] and a scale of 100%,
a 3D position of [500,400,-300] would give me a scale of 130% (example)What would be the expression for the scale? (relative to the active Camera I would assume)
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3 Replies
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Have you tried leaving the layer 3d but enabling auto-orient towards camera? I think it might accomplish what you are trying to do…
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Hi Gabriel,
.toComp() is generally used for 2d layers. Have you tried .toWorld(), which is used for 3d layers?
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I’ll put the working solution here for future reference.
The following expressions assume that the target 3D layer is the next one, right under the 2D layer (index+1), but that could be changed of course.
Expression for position:
thisComp.layer(index+1).toComp(thisComp.layer(index+1).transform.anchorPoint)Expression for Scale:
L = thisComp.layer(index+1);
C = thisComp.activeCamera;
CP = C.toWorld([0,0,0]);
LP = L.toWorld(thisComp.layer(index+1).anchorPoint);
dis = length(CP,LP);
CZ = C.cameraOption.zoom;
LS = L.transform.scale[0];
S = LS*CZ/dis;
[S,S];
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