> v3d and axis3d describe the position of the primitive in 3D space.
v2d and axis2d describe an axis at the sketch which will be put on the
3D rotation axis.
> I.e. think of a sheet of paper with a sketch on it. If you glue a
thread on the paper the thread forms a 2D line there. Then you lift
the paper with the thread (the thread is now the 3D axis) and turn it
around.
I understand. But when I look through the code dealt with pipe, I found v2d and
axis2d is seldom used. If a revolve has its v2d and axis2d not set, it works
quiet well. In most cases we just use v3d and axis3d.
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