I want to make a tunnel with a texture on inner walls.
How can I make my plane into a cylinder?
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Why so? Instead, make a NURBS/bezier semicircle and extrude it, setting the desired value in the Geometry section. Convert it to mesh, solidify outside and texturize the wall inside.To do that give it a different material color.
or simpler yet
Add a circle mesh, remove half of its vertices and extrude. Then do as above.