Just wondering if SP can use the model's UV cavity map, normal map, etc and allow you to project textures only in the cavities areas?
For example, Mari uses the "channel Mask" which you can import your normal maps of your model and apply your textures based on the model's UV maps.
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I don't think there is a way to do it like in Mari, but to reach a similar effect in Painter you can simply create a paint layer, add a mask to it and load your cavity map there. Then when you paint the result will be automatically masked out (including stencil/texture projection). This even allows to adjust the cavity map afterward.