Help - UV Unwrap 

Properties of UV Unrwapper are available in this dialog.

Maximum Streetch Factor Define streetch factor of generated UVs. 0 - no streecthing of triangles, 1 - maximum streetch allowed.
[X] Update Existing UV If checked, existing UV will be recalculated. If not checked and UV channel is present, tool will exit immediatelly.
[X] Optimize If there are few more UV channels already, array of UV points will be optimized.
[X] Process mutiple selection as single object If you want to process multiple objects at once and want to use single image, then you should use single UV. Set this check-box then.
UV Channel Desired UV channel.


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