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Im trying to put a hole in a curved surface while maintaining curvature and clean topology. Deleting a vertex and selecting the loop and using loop tools > circle always flattens out the surrounding area and i can never get the curvature right when sliding edges and vertices around arbitrarily. enter image description here

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  • $\begingroup$ moonboots to the rescue once again! $\endgroup$
    – bonypoy
    Dec 3, 2021 at 17:31

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Create another cylinder that has the same radius (or duplicate the current one and rotate it 90° on Z). Select your cylinder with the hole, select all the vertices around the hole, assign them to a vertex group (CtrlG):

enter image description here

Give a Shrinkwrap modifier to the cylinder with the hole, choose the other one as Target, select the vertex group, apply the modifier:

enter image description here

You may need to give a Subdivide Surface modifier to the other cylinder if necessary.

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