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In the picture below I use subdivision and I want to make the angle of this half circle hole sharp

enter image description here

But when I do edge crease, the topology overlaps and creates bad shading; enter image description here

I don't want to add a support loop because of it's effect on the curvature of the whole cylinder. I also tried bevel, but that creates a triangle that ruins the topology also.

Does anyone know the solution?

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Here's another possible flow for your support loops:

enter image description here

enter image description here

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  • $\begingroup$ Perfect solution! $\endgroup$ – Alexandre Marcati Jun 14 at 14:38
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    $\begingroup$ Hi @AlexandreMarcati ! As you say, there are quite a few. This one costs you a slight bevel in the corners.. maybe acceptable. $\endgroup$ – Robin Betts Jun 14 at 14:43
  • $\begingroup$ Thanks , that a great idea $\endgroup$ – mshmsh Jun 16 at 12:24
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The edge crease tool is very limited and will not give a good result in every situation. In my experience situations such as the one you're showing have to be dealt with good old retopology techniques.

Adding loops doesn't have to mess with the curve of the cylinder. Here is a suggestion on how you could deal with that crease without messing with the roundness of the cylinder and still having only quads (although I used two diamond-like faces, they're still quads - except for the big N-gon in the bottom of the hole that was already there, I mean): enter image description here

This is just one possibility that you can try out and see if the result is good enough. But you can come up with other, perhaps better, solutions on your own if you do some trial and error.

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  • $\begingroup$ thanks that helpful ! $\endgroup$ – mshmsh Jun 16 at 12:24

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