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Is it possible to composite multiple .exr files into a single .exr file?

For example, if one .exr file contains several passes and another contains only one pass could they be combined to contained all in one file?

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Yes you can load several EXRs on the compositor and save all of their channels into individual layers on an OpenEXR multilayer.

Add a file output node, set it to OpenEXR muyltilayer and than add as many inputs as you need.

enter image description here

You can rename the channels as needed by double clicking on the name:

enter image description here

For more details see this answers:

https://blender.stackexchange.com/a/18406/1853

How can I render all render passes to files in Cycles?

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  • $\begingroup$ Just a tip for anyone pretty new to blender, to edit a node's settings like above: $\endgroup$ – Animatoring May 25 '16 at 15:15
  • $\begingroup$ 1. Select the node $\endgroup$ – Animatoring May 25 '16 at 15:15
  • $\begingroup$ 2. Open the node settings panel with N $\endgroup$ – Animatoring May 25 '16 at 15:16
  • $\begingroup$ Sometimes the node settings panel is hidden, try using the hotkey if you are having trouble finding it. $\endgroup$ – Animatoring May 25 '16 at 15:16

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