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When the center point of rotation is omitted, the origin is assumed. When a point has only two coordinates, they are taken as x and y, with z=0 assumed. A toroid is therefore obtained with this code.
def n_toroid_segs 20 def n_circle_segs 16 def r_minor 1 def r_major 1.5 sweep { n_toroid_segs, rotate(360 / n_toroid_segs, [0,1,0]) } sweep { n_circle_segs, rotate(360 / n_circle_segs, (r_major,0,0)) } (r_major + r_minor, 0)For intuition, the idea of the code is to sketch a circle to the right of the origin in the xy-plane, then rotate that circle “out of the plane” about the y-axis to make the final figure. This produces the following. (A view rotation and some axes have been added.)
This example also shows that the swept object may itself be another
sweep
.
In fact, it may be any sketch
expression that results in
a list of one or more points or, alternately, a list of one or more
polylines and polygons. The latter kind of list can be created with a
{ }-enclosed block, perhaps following a
put or
repeat.
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They may not be fully stable and should be used with caution. We make no claims about them.