Do a geometric transformation of layers to semi-cylindrical / semicircular?

Questions
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1

Hello people good night!!
Is there any command that I can modify these white layers to semi-cylindrical or semicircular?
Please give me some help, because I did not find anything that could change.

2

Have a look at e.g. ParametricPlot3D

3

Thank you Sander, I’ll check. I looked at some examples but I did not see them all. But it may already be a path.

4

GeometricTransformation or TransformedRegion and related functions?