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1. Cut a hole in this part, right here. Thats why I added the highlightet lines.

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2. Added a Cylinder, smooth shaded, and auto smooth.

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3. First problem arrives. If the cylinder only intersects the upper part of the object I get artifacts. If it scale the cylinder in z direction, so that it intersects the whole object I dont get artifacts, so I do it this way. I also use the "Fast" Solver as this also does not result in artifacts.

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4. I apply the boolean and there is my hole. No artifacts. But when I extrude it down, artifacts start to show up. I tried adding supporting lines. I tried extruding the inner faces of the hole and scaling them down. Face normals are correct. I tried "clear costum split normals data" ind the object data" but nothing worked.

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EDIT:

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  • $\begingroup$ Hello could you please share this part of your mesh? $\endgroup$
    – moonboots
    Jul 6, 2023 at 18:07
  • $\begingroup$ Do you mean a blend file with only the 2 meshes involved? $\endgroup$
    – patrick823
    Jul 6, 2023 at 18:25
  • $\begingroup$ Yes just share the necessary $\endgroup$
    – moonboots
    Jul 6, 2023 at 18:54
  • $\begingroup$ I put it at the end of my original post. $\endgroup$
    – patrick823
    Jul 6, 2023 at 19:12
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    $\begingroup$ Don't you want to mark sharp the edges of the hole? You would get rid of this shading $\endgroup$
    – moonboots
    Jul 6, 2023 at 20:27

1 Answer 1

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The Shade Smooth will smooth the shading between the perpendicular faces, which will give this bad result:

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You can either Clear Custom Split Normals Data and play with the Auto Smooth value so that it doesn't smooth above 90°, or select the edge loops and CtrlE > Mark Sharp:

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Result (note that there's a clipping problem, tweak the clipping values in the N panel):

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