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I'm new to Blender and have been trying to render objects against a 2D background using a shadow catching method posted by Andrew Price. Here's a link to the screenshot of the node structure (Node Setup).

enter image description here

It's a low quality demo but clearly shows white pixels where the object edges meet the background. Here is a link to the result (Test Result).

enter image description here

Does anyone have a fix? Thanks in advance!

Duarte Farrajota Ramos
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Varnold
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    I know it may seem counter-intuitive to uncheck anti-aliasing, but that might be introducing the edge. – Doyousketch2 Mar 21 '17 at 20:28
  • You should do this like this: http://blender.stackexchange.com/a/19767/7777. Having passes with transparency eliminates the edges introduced with ID masks. ID masks are limited, see: http://blender.stackexchange.com/a/36089/7777 – Jaroslav Jerryno Novotny Mar 31 '17 at 08:39

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