Sometimes I want to mask or roto an image and then apply an effect AFTER the mask is applied. Or sometimes I want: 1.) effect 2.) mask 3.) effect. However AE doesn't give any control for the render order for masking. Is there a reason for this, or has there simply been no demand for this type of thing? I've been lobbying for this for years. If splines (masks) were attached to specific effects (where "masking" would become an effect on the stack) there would be no confusion as to which splines are being used for which purpose…. And would eliminate a lot of the ambiguity that results that comes from having multiple effects (including ones not performing masking, like our Twixtor or RE:Flex, or AE's stroke effect, etc.) from a list of splines attached to the layer (where they may also be used for masking) instead of unique to an effect.
What I propose is indeed how Combustion provided splines and made for a much more transparent user interface. Oh, and allowed you to perform masking anywhere within the set of effects on the effect stack.
Pete
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