Cylinder <height> <bottom radius> <top radius> <sides>
This command creates a cylinder of the given dimensions in the current clump. The cylinder is transformed by the current transformation matrix and its surface is assigned the current material.
The bottom and top radii can be either both positive or both negative. They cannot be zero. Negative radii create a cylinder that is "inside out" (i.e. only visible from the inside). The number of sides must be greater than two.
<height> the height of the cylinder
<bottom radius> the radius of the bottom of the cylinder
<top radius> the radius of the top of the cylinder
<sides> the number of sides of the cylinder