Why do creases appear when I turn on subdivision divider?

Asked Mar 22 '20 at 06:31

Active Mar 22 '20 at 08:35

Viewed 19 times

So I'm mid-way through modelling a head, and so I decided to turn on subdivision surface modifier to see what it would look like with smoother geometry, but it created some weird creasing effects (not sure what else to call it) on the head, and I have no clue why.

This is without the modifier on:

Does anyone know how I can fix this?

asked Mar 22 '20 at 06:31

user71811

2

This is probably and as often due to inverted normals. In edit mode use Shift+N. If not try to remove doubled vertices (merge by distance) Alt+M. – lemon Mar 22 '20 at 07:47
Check if there are no double vertices. – Tomas Kru Mar 22 '20 at 08:35
The normals were inverted; thanks! It's fixed now – user71811 Mar 23 '20 at 08:25

Why do creases appear when I turn on subdivision divider?

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