I have the following mesh. As you can see there are quite a bit of triangles that are unnecessary, and can be reduced. However, if I use the decimate modifier, other triangles are also decimated and morphs the shape.
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1$\begingroup$ The decimate modifier has a lot of options. Play with the settings for planar, using Angle Limit and All boundaries for more info read: blender.org/manual/modeling/modifiers/generate/… $\endgroup$– user1853May 19, 2016 at 17:22
1 Answer
If decimate is too destructive, then while in edit mode, select all, then press X>limited dissolve to remove excess edges in your model. You can adjust the angle threshold in the operator panel as needed. Don't forget to also remove doubles with W>remove doubles.
You can also try tris to quads. Press Spaebar and type in tris to quads, and select the operation from the menu, or or press Alt + J