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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 What the problem is

What it should look like

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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. $\endgroup$ May 23, 2021 at 22:44
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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.Blender screenshot of pulling a vertex on a sphere

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    $\begingroup$ 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... 🤔 $\endgroup$ May 23, 2021 at 22:18

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