How to bake materials that don't have an image texture?

Support Materials and Textures
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I believe you need a 3rd-party add-on to bake to vertex colors (I might be mistaken).
You can bake to an image without an image texture node attached to your base color node though, however you’ll still need:

  • 1 UV node
  • 1 Image Texture node

image
image1366×768 75.1 KB

The bake setup directs Blender to which image to bake to, as well as which UV to use in the baking process.

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