Example: Make a 3D layer invisible if facing away from camera
Apply
the following expression to a 3D layer’s Opacity property:
if (toCompVec([0, 0, 1])[2] > 0 ) value else 0
Apply
the following expression to a 3D layer’s Opacity property:
if (toCompVec([0, 0, 1])[2] > 0 ) value else 0
Dan explicates this expression on his website:
http://www.motionscript.com/design-guide/invisible-facing-away.html
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