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"Backfacing" output for raycast node

Could be useful to detect invisible geometry when baking, for example.

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Development Status: Open

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Romash
6 May 2026

3 Comments

maxime1

you can now with the new attribute feature projects.blender.org/blender/blender/pulls/157344

Romash Author

That's not exactly what I'm asking for. These attribute outputs work only for geometry attributes, such as vertex position, UV maps, vertex colors, custom attributes, etc.. Yes, you can add custom vector attribute with geometry normals via geometry nodes and use this custom attribute to determine if ray hits back face or not, but that's just a workaround.

maxime1

yes that's a workaround but it works. I just wanted to help you in case you really needed such an option for a specific project, but if you simply believe it would be a great feature to add, then yeah that's a good point!

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