Reference:Disc
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Another flat, finite object available with POV-Ray is the
disc
. The disc is infinitely thin, it has no thickness. If you want a
disc with true thickness you should use a very short cylinder. A disc shape
may be defined by:
DISC: disc { <Center>, <Normal>, Radius [, Hole_Radius] [OBJECT_MODIFIERS...] }
Disc default values:
HOLE RADIUS : 0.0
The vector <Center>
defines the x, y, z
coordinates of the center of the disc. The
<Normal>
vector describes its orientation by describing its
surface normal vector. This is followed by a float specifying the
Radius
. This may be optionally followed by another float
specifying the radius of a hole to be cut from the center of the disc.
Note: The inside of a disc is the inside of the plane that contains the disc. Also note that it is not constrained by the radius of the disc.