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sampleimage
I was playing with Dan’s sampleimage expressions, and would like to have the alpha value of a specified layer control the rotation of a layer.
I pasted this expression on the Y-axis of my layer…
target = thisComp.layer(“background”);
a=target.sampleImage(transform.position, [width, height]/2, true, time)[3];
linear(a, 0, 0.36, 0, 180)But get this error: sampleimage() must be 2 numbers
What am I doing wrong? Was I close? -
2 Replies
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Ok, so I discovered that the error “must be 2 numbers” is because the layer i want to effect is a 3D layer, and is returning 3 numbers (xyz)
Is there a way around this, or is the sampleimage expression limited to 2D?
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Ha, worked it out. Here’s the solution if anyone wants it.
target = thisComp.layer(“background”);
a=target.sampleImage([transform.position[0],transform.position[1]], [width, height]/2, true, time)[3];
value=linear(a, 0, 0.36, 0, 180)
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