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I have a Illustrator vector shape (It has a shape path around it). But I need a mask line in the middle of the shape. The problem with with doing it by drawing a shape line over it is that I can't get the corners right.
I want to use the middle lined mask to do animations with.
Is there an easy way to achieve this?
In Photoshop (or Illustrator), in a new layer above the vector shape, create a solid shape of the mask you want (with rounded corners). Export that layer alone as an image and import into AE.
Use auto-trace to create a mask from it. See https://helpx.adobe.com/after-effects/using/creating-shapes-masks.html#create_a_mask_from_channel_values_with_auto_trace
