open virtual-face-images 3 incur seams

[canvasemode]

Describe the bug
when run TextureMesh command with "--virtual-face-images 3" will incur seams error. And with "--virtual-face-images 0" will clean the seam

To Reproduce
Steps to reproduce the behavior:

1. Run "TextureMesh --virtual-face-images 3 "

Expected behavior
no seams texture mapping

Screenshots