Weird geometry when using Mirror + skin modifiers

Question

I'm following a course from CGCookie (Basics of character modelling). I'm trying to pull one of the vertices backwards:

there's a mirror modifier on, as well as skin and subsurf.

enter image description here

All the geometry gets warped:

enter image description here

Same thing happens when I'm trying to extrude another vertex from the bottom one.

Can anyone please help? I tried asking the question on the course's page, but the mods deleted it for some reason.

Forgot to mention - there's a mirror modifier on, as well as skin and subsurf. — El Pollo Diablo, Jun 07 '15 at 15:33
Does this help? http://blender.stackexchange.com/questions/27394/strange-problem-cant-transform-faces-edges-or-vertices-without-transforming/27395#27395 — Ray Mairlot, Jun 07 '15 at 15:36
I'm afraid not. That was the first thing I checked. Thanks for the clarity edit though ;). — El Pollo Diablo, Jun 07 '15 at 15:39
I think I'd just better give you the .blend, since character modeling is completely new for me and I'm flying blind here. link — El Pollo Diablo, Jun 07 '15 at 17:28

Denis · Accepted Answer · 2015-06-07T17:34:07.537

5

Skin Modifier is generating the geometry from the root vertex (marked with dashed circle around it), and if its not on the mirror axis that will generate mesh errors.

To fix that select the vertex of the groin area and in Skin Modifier click Mark Root.

enter image description here

edited Jun 07 '15 at 17:34

answered Jun 07 '15 at 17:19

Denis

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Useful clarification of the problem statement. – atomicbezierslinger Jun 07 '15 at 17:29
That fixed it! Thank you so much for the answer and for the explanation! I was so sure I tried doing it before. – El Pollo Diablo Jun 07 '15 at 17:36

Weird geometry when using Mirror + skin modifiers

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