Extrusion is typically the first step to generate a 3D building from a 2D footprint.
This operation increases the dimension, i.e. a two-dimensional building footprint can be
extruded into a three-dimensional mass model.
Lot--> extrude(4) Building
If a building lies on hill ground, it might be desired to extrude along a world coordinate axis rather than the face normal.
Lot--> extrude(world.up, 30)In example 2, the extrusion is along the global y-axis.
Another extrusion variant is to taper the fooprint, see the taper shape operation.
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