A geometry node about “How to prune a mesh to the alpha mask of an image and to get the border of it as curve.”
I made this one for a Blenderartist WE challenge entry, and want share the workflow with you here:
Workflow:
- use UV-Map (accessible by Named Attribute) to sample the image
- cut mesh to image
- identify border of mesh and convert to curve
- smooth it
- do something with it.
Settings:
- you shoud provide enough mesh geometry at the border for a cleaner cut.
- the curve resampling will reduce hard corners. > Choose the resampling count accordingly.
Blendfile:
tutorial_border.blend (1.9 MB)