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NAME
torus - create a regular torus
SYNOPSIS
torus
vc rmin rmax
DESCRIPTION
Create a torus of the current material centered on the named vertex
vc
with an inner radius of
rmin
and an outer radius of
rmax.
The plane of the torus will be perpendicular to the normal vector
associated with
vc.
If this vertex is undefined or has no normal, an error will result.
If a torus with an inward facing surface normal is desired,
rmin
and
rmax
may be negative.
The minimum radius may be zero, but may not be negative when
rmax
is positive or vice versa.
The magnitude or
rmax
must always be strictly greater than that of
rmin.
EXAMPLE
# The proverbial brass ring -- easy grip version
o brass_ring
m brass
v center =
p 0 0 0
n 0 1 0
torus center .02 .03
o
SEE ALSO
cyl,
cone,
f,
m,
prism,
ring,
sph,
v