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UV Master unwrapping problem

Hey everyone, I’m trying to unwrap uvs for a human body model by using uvmaster. No matter if I try to unwrap the uvs symmetrical and with polygroups or without , the unwrapping process takes more than 20 minutes and leads to scattered uvs as shown in the attached image. Does anyone have an idea what could possibly lead to this strange result ? Thank you very much in advance.

Attachments

o_rp4xXPbFLdHaj4fHFDjv6IBKUfOFWk.jpg

o_u2JVTM6kayOZALK7f0a8XCutox1SLA.jpg

Looks like your winding order is all borked.

tool>geometry>MeshIntegrity
Try those 2