The RenderMan Interface - Paul Bourke

RiCylinder ( RtFloat radius, RtFloat zmin, RtFloat zmax, RtFloat thetamax,
...parameterlist...)
Requests a cylinder defined by the following equations:
θ = u · thetamax
x = radius · cos(θ)
y = radius · sin(θ)
z = v · (zmax − zmin)
Note that the cylinder is open at the top and bottom, and if thetamax is not equal to
360 degrees, the sides also are open.
RIB BINDING
Cylinder radius zmin zmax thetamax ...parameterlist...
Cylinder [radius zmin zmax thetamax] ...parameterlist...
EXAMPLE
Cylinder .5 .2 1 360
SEE ALSO
RiCone, RiHyperboloid
RiHyperboloid ( RtPoint point1, RtPoint point2, RtFloat thetamax, ...parameterlist...)
Requests a hyperboloid defined by the following equations:
θ = u · thetamax
x r = (1 − v)x 1 + v · x 2
y r = (1 − v)y 1 + v · y 2
z r = (1 − v)z 1 + v · z 2
x = x r · cos(θ) − y r · sin(θ)
y = x r · sin(θ) + y r · cos(θ)
z = z r
assuming that point1 = (x 1 , y 1 , z 1 ) and point2 = (x 2 , y 2 , z 2 ).
The cone, disk and cylinder are special cases of this surface. Note that the top and
bottom of the hyperboloid are open when point1 and point2, respectively, are not on
the z-axis. Also, if thetamax is not equal to 360 degrees, the sides are open.
RIB BINDING
Hyperboloid x1 y1 z1 x2 y2 z2 thetamax ...parameterlist...
Hyperboloid [x1 y1 z1 x2 y2 z2 thetamax] ...parameterlist...
EXAMPLE
79