Annulus

The annulus is a plane elliptical surface shape defined by 4 parameters:

Parameter #	Description	Face Name	Face #
1	The X Maximum Half Width.	All Faces	0
2	The Y Maximum Half Width.	All Faces	0
3	The X Minimum Half Width.	All Faces	0
4	The Y Minimum Half Width.	All Faces	0

The annulus resides entirely within the local XY plane. If the minimum half widths are set to zero, then no "hole" exists and rays will hit anywhere within the maximum half widths. In this case, the annulus is identical to the ellipse.

The reference coordinate is the center of the annulus. Face Numbers: All faces Face 0.

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