How to get rid of wrinkles?

Support Modeling
1

How can I get rid of these wrinkles?

Screenshot%20from%202019-01-30%2014-04-43
Screenshot from 2019-01-30 14-04-43.jpg1366Ă—768 296 KB

Screenshot%20from%202019-01-30%2014-05-23
Screenshot from 2019-01-30 14-05-23.jpg1366Ă—768 392 KB

Blend file : wrinkles.blend (743.4 KB)

2

Can you show us the mesh in Edit mode? Looks like pinching caused by geometry.

3

I couldn’t get good picure from edit mode that’s why I posted .blend
Yes it’s geometry but I have no clue what is issue.

4

wrinkles
wrinkles.png1920Ă—1004 197 KB

Unapplied and non-uniform object scale. ctrl+A -> scale to apply. There’s double geometry, unless you want to separate the vertices that are bunched together where the wrinkles happen

wrinkles1
wrinkles1.png1920Ă—1004 300 KB

Which is here. You have a concave n-gon which alone would make artifacts, but the edges also go beyond the bottom surface, and the corner vertices are in one location

wrinkles2
wrinkles2.png1920Ă—1004 242 KB

The model is full of severely non-planar polygons, concave n-gons, and n-gons where they shouldn’t be.

  1. View is aligned such that it shows how non-planar the face is. It makes a fold without actual edge defining it
  2. An example of a regular n-gon which makes a chaotic subdivision pattern. The edge on the form is supported so it’s not that bad, but might cause texturing problems later on. There are other n-gons that are on the form edges itself, which is worse.

non-planar Shading Issue
concave Simple modeling question: Triangle stays when moving vertices

Few things about the linked examples:
Non-planar polygons are commonplace and ok, it’s the severely non-planar ones that cause problems. The usual reason for them is that the structure doesn’t follow the form, and the fix is to change the structure flow so it does. The example shows a cause and fix that comes up less often, and adding more polygons is not an universal fix.

Both quadrilateral and n-gon faces can be non-planar and also concave. Example only shows concave quad.

wrinkles12.blend (119.6 KB)
Blue material is named concave. That should be named “n-gon” instead.

2 Likes
5

Thanks this really explained some things about modeling. So basically I need to make quad only or quads and triangles (however triangles are bad when animating afaik) model but quads have to be flat (planar)?

6

All face types are fine, but use triangles and n-gons sparingly. They don’t have to be absolutely flat, subdivision surface will divide those into smaller polygons, and smooth shading hides the rest, but all polygons have to be convex.

1 Like
7

Oh, ok. I have little bit of trouble with terminology, even when I translate to my language because I haven’t payed attention in class when we were learning that :slight_smile: Thanks again.