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Cutting a Hole in a Curved Surface
See this video tutorial by Jonathan Williamson on Blendercookie
Topology: In order to cut a clean hole into a curved surface, the mesh topology needs to be clean too
Create a Sphere from Default Cube ( better topology for further editing)
Example sphere: Do not use the UV-Sphere or Icospheres, but
- add a Subsurf ( Subdivision Modifier) level 3 to the default cube
- hit ALT + SHIFT + S, in the left lower corner command line, you see "To Sphere…"
- Enter 1 and hit "Enter" to get a 100% sphere
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