Extrusions are the main object in 3D modeling, so here are some rules for Extrusions. Extrude To create an extrusion start with a solid 2D element, for example a rectangle, a circle, etc. If you want to render the object it has to be a solid object before you extrude it. It can be a line, rectangle, polygon. It can be any 2D shape.
Extrusions follow a few rules:
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