Moving a vertex makes only half of the connected faces move in the right way

Question

Sorry if the title doesn't accurately describe my problem, I am new to Stack Exchange. I need to make all the faces move up equally, but the ones circled in yellow only move up half way, while the ones in red are how I want them to move. This has happened to me multiple times with different models and I am trying to find a solution

Hello :). The problem is called non-planar faces (if you want to read up on it). Triangles always stay planar, so they might work better in this case. — jachym michal, May 23 '21 at 20:57
https://blender.stackexchange.com/questions/56755/flat-quads-or-why-is-my-mesh-so-funky/56764#56764 — Duarte Farrajota Ramos, May 23 '21 at 21:03

score 6 · Accepted Answer · edited May 26 '21 at 10:29

6

Your problem comes down to changing the internal triangulation done by Blender, as described by Robin Betts here: flipping internal triangulation

In your particular case: select problematic faces, Ctrl + T to triangulate, change Quad Method to Fixed Alternate, select the new edges and dissolve them:

If you want to make a script automatically fixing such quads, this could be a starting point: Select concave quads

edited May 26 '21 at 10:29

Robin Betts

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answered May 23 '21 at 22:10

Markus von Broady

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I thought of a similar situation, but I decided to tell about proportional editing since it would be a less complicated way for begginers and did not deal with fixing improper meshes. – Yousuf Chaudhry May 23 '21 at 22:44

score 4 · Answer 2 · edited May 26 '21 at 10:16

4

The best solution is proportional editing. Press 'O' or that little icon on the top highlighted in the image below. Then when you move a vertex you will see a circle around the vertex you have selected. The size of the circle is controlled by the scroll wheel on a mouse. The bigger the area the circle is, the more strongly the other vertices will move with that single vertex.

edited May 26 '21 at 10:16

Kingsley

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answered May 23 '21 at 20:54

Yousuf Chaudhry

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I disagree this is the best solution, I even doubt this is at all a solution the OP is interested in, however it could be helpful to other visitors finding this thread through google... – Markus von Broady May 23 '21 at 22:18

Moving a vertex makes only half of the connected faces move in the right way

2 Answers2

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