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
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5$\begingroup$ 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. $\endgroup$– jachym michalCommented May 23, 2021 at 20:57
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1$\begingroup$ blender.stackexchange.com/questions/56755/… $\endgroup$– Duarte Farrajota Ramos ♦Commented May 23, 2021 at 21:03
2 Answers
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
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$\begingroup$ 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. $\endgroup$ Commented May 23, 2021 at 22:44
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.
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3$\begingroup$ 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... 🤔 $\endgroup$ Commented May 23, 2021 at 22:18