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I am trying to replicate a “Camera Dad” expression that I say one time created for the flame in After Effects. It’s an expression to calculate the scale of a 3D layer to fill the FOV based on it’s distance from Camera. So as you move the layer to or away from camera is calculates the exact scale. I can’t seem to remember where I saw this. Unfortunately I don’t have a flame at my access right now and I don’t remember enough about the math to make it work. Any suggestions would be great.
Jason Fotter
http://www.theoutfitvfx.comYou can parent the 3d layer to the camera and then use the following expression for the scale property:
temp=100*transform.position[2]/thisComp.layer(“Camera 1”).cameraOption.zoom;
[temp, temp, temp]
This requires that the layer is perpendicular to the camera though…This worked perfect…..
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