Merge objects with intersecting co-planar faces? I would like to merge intersecting faces of 2/3 polygons:



I selected all objects with A and merged them. I tried the delete duplicate method but that did not fix it. How can I merge these 3 faces so I can apply a material to that side of the object?
In this specific situation you can ...


Add Remesh modifier (Octree 3), Apply
Select all vertices and X Limited Disolve
W Merge by Distance
Select two vertices of hole and X Disolve Vertices




For some reason I lost two corner edges in N-gon (probably to much disolving :) ).  To fix it ...


Select all vertices Triangulate Ctrl+T 
Select all vertices and X Limited Disolve again