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No, there is no way to adress vertices in shape paths or masks using expressions. If it is just a straight line, Effects --> Generate --> Beam applied to a solid matching the comp size is your friend. Everything else will require different effects and possibly more complex expression rigging.
Thanks, that's exactly what I needed.
Rick, is there a way to do that with Shape layers instead of masks?
Just use a shape layer instead of a solid with a mask.
Hmm. I must be doing something wrong. So here is what I did.
I created a shape that is just two points to create a line, as you did with your mask version. Then I made a null for the "Kite" layer you used. I then put in your expression, replacing "Kite" with the name of my layer. The expression then gives me this error:
"AE Warning: property or method named '2' in Class 'Array' is missing or does not exist. It may have been renamed, moved, deleted, or the name may have been mistyped. A property expression referencing it was disabled.
'Scale' (line 7) of layer 3 ('Shape Layer 1') in comp 'Comp 1'
Also, I am using the latest version of AE in case that matters. Thanks in advance for any help.
I'am trying to do exactly what you need to do. Did you succede in?
Thank you in advance!
I'd love to see the resolution to this old thread... I'm needing to do this exact thing right now.