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dan’s “Layer Invisible When Facing Away” expression quick question
if (toCompVec([0, 0, 4335])[2] > 0 ) value else 0
if (toCompVec([0, 0, 4335])[2] > 0 ) value else 0
i’m following Dan’s “Layer Invisible When Facing Away” expression, incredibly useful that it is!! Just have a quick question. Here’s the expression i’m referring to:
if (toCompVec([0, 0, 4335])[2] > 0 ) value else 0
i can understand each aspect of the expression, except for
[2] > 0
What is the 2 for? And what is the (presumably) Less Than Zero for?
Would really appreciate thoughts (especially ones for non-expression peoples like myself!)
replied 17 years, 5 months ago 2 Members · 1 Reply
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1 Reply
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Yikes. Where did the 4335 come from?
In any case, the [2] just tells the expression to look at the z component of the vector created by toCompVec(). Then, if that value is greater than zero (>) it leaves the opacity alone, othwise (meaning the layer is facing away from the camera/comp view) it sets the opacity to zero.
Hope that helps.
Dan
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