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I'm trying to make a hole in a helmet. Can somebody tell me why this happened?

enter image description here

Jozef
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  • I guess bad geometry, and subsurf. Search here many other similar issues with holes and weird results – m.ardito Mar 09 '19 at 08:15
  • are you using solidify modifier? –  Mar 09 '19 at 10:35
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    Could you describe what you did here? The problem is the geometry. Using ngons (polygons with more than 4 vertices) and applying modifiers to it, will cause crazy deformations and artifacts like the one you have. When using boolean operations, you will often need to go in and fix things to make it work properly. This means either adding more geometry to your main mesh or using a cyclinder with less vertices and you'll also need to merge vertices together make sure your faces are 4 vertices or less if you want to use other modifiers on top. Could you provide more information in your question? – Mark Jackson Mar 09 '19 at 11:56
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    Watch this video: 8 ways of cutting holes. Read also these related links: Cutting a hole in a cylinder and Cutting a rounded hole in a sphere –  Mar 09 '19 at 12:15

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