im new in blender.
I have a cube and only move the edge, one face look good but the other.....
Its a bug or im doing something wrong?
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Go into edit mode, and press A to select all the vertices. Press the spacebar and type in "Triangulate Faces," and that should fix the problem.
Or these triangles:
As you can see, both versions use the same exact vertex locations, but achieve completely different effects. However, Blender doesn't know which one to choose. In your case, Blender gets confused and decides to basically fold the weird looking face in half, instead of making it concave. By using "Triangulate Faces," you are basically asking Blender to turn each face into a specific set of triangles, so that way it doesn't get confused about the possibilities. In the end, your cube should look like this:
I hope I helped you, and let me know if you have any questions.
Happy Blendering, Graves Broderick