Use these options to set what happens when you select .
Settings
- Border target shape
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Select the shape type that you want to map the UV border to (Square or Circle).
- Automatic
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Turn on Automatic to map the UV border automatically in a shape that approximates the best use the texture space while maintaining the world-space relationships between edges.
- Preserve original shape
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Determines how closely the border mapping will match the selected Border Target Shape. Use the slider or enter a value between 0 and 1 to control the blend of the existing UV border with the specified Border Target Shape. A value of 0 produces a UV border mapping that is closest to the specified target shape (Square or Circle). A value of 1 produces a border that closely represents the world-space relationships between edges, but can result in concave areas along the border—these will produce overlapping interior UVs once relaxed.
Note: Map Border may not be able to find a unique border with non-manifold geometry.If you have a piece of non-manifold geometry, any particular UV may be in more than one border/shell, so it does not uniquely determine a flat piece of mesh to relax. Map Border will find a boundary and map it, but you can't control which one it will get.
To work around this you can cut the UVs along the non-manifold edges to make sure that they're “flat”, or use Cleanup to eliminate the non-manifold areas first.