• Adobe After Effects Expressions

  toWorld – different resolution layer for corner pin

  Posted by Andy Engelkemier on November 29, 2012 at 2:18 pm

  I have a layer with a different resolution and aspect ration than the comp and I need to corner pin the layer to the layer below it using an expression.

  The comp is 1280×720 but the layer I need corner pinned is 2200×3797

  The layer I want to corner pin has been scaled from a few different parents so I want to capture the location of it using “toWorld”.

  The problem is I don’t know what to do with those numbers because the corner pin works on the layer’s resolution.

  So for the left corner I have a Null in the position I want. If I corner pin a solid then the expression works:
  c = layer;
  c.toWorld(layer’s anchor);

  What I can’t seem to wrap my head around is how to convert the comp space numbers back to layer space so the corner pin will work.
  I gave an attempt at it, but can’t make sense of any of the numbers that are coming back.

  Dan Ebberts replied 13 years, 5 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  November 29, 2012 at 2:40 pm

  Try these:

  // upper left
  L = thisComp.layer(“target”);
  fromComp(L.toComp([0,0]));

  // upper right
  L = thisComp.layer(“target”);
  fromComp(L.toComp([L.width,0]));

  // lower left
  L = thisComp.layer(“target”);
  fromComp(L.toComp([0,L.height]));

  // lower right
  L = thisComp.layer(“target”);
  fromComp(L.toComp([L.width,L.height]));

  Dan

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