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For a papercrafting application I need to decimate (collapse) the geometry in order to reduce the number of faces. The original geometry looks like this: original geometry without decimate modifier

When applying the decimate modifier (with triangulation), I noticed that the flat base of the spherical dome is not planar anymore: geometry after collapsing

I want keep this face planar (which is intentionally so in order to be glued to something else) while collapsing.

Is there a way to constrain the vertices of that face such that the decimate modifier will be able to move them only within the plane of that face?

Since I'm still a newby to Blender, I wouldn't know where to look for a solution. My searches for obvious keywords did not surface anything that looked applicable to my problem.

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Use checker deselect to dissolve every nth top and bottom vertex or try the Decimate modifier options (co-planar etc.)

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