Clean Corners for Subdivision I added a few support edges to get sharp edges and then merged some vertices, so the edge loops don't spread on my whole model. Now I have all quads, but the corners don't look right.



I know that I could get away with triangles on the bottom part, because it is a flat surface, but what about the pointy star trek polygon in the back?
Going into wireframe mode shows that the subdivision creates a fold in the model.



Creasing the sides of the star trek polygon pulls the fold out.



That basically solves my problem, because the render looks right, but the topology doesn't: