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## 8.33 `solids`

This solid geometry package defines a structure `revolution`

that
can be used to fill and draw surfaces of revolution. The following example
uses it to display the outline of a circular cylinder of radius 1
with axis `O--1.5unit(Y+Z)`

with perspective projection:

import solids; size(0,100); revolution r=cylinder(O,1,1.5,Y+Z); draw(r,heavygreen);

Further illustrations are provided in the example files `cylinder.asy`

,
`cones.asy`

, `hyperboloid.asy`

, and `torus.asy`

.

The structure `skeleton`

contains the three-dimensional wireframe
used to visualize a volume of revolution:

struct skeleton { struct curve { path3[] front; path3[] back; } // transverse skeleton (perpendicular to axis of revolution) curve transverse; // longitudinal skeleton (parallel to axis of revolution) curve longitudinal; }

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