rpatch(3G)							    rpatch(3G)

NAME    [Toc]    [Back]

     rpatch - draws a rational surface patch

C SPECIFICATION    [Toc]    [Back]

     void rpatch(geomx,	geomy, geomz, geomw)
     Matrix geomx, geomy, geomz, geomw;

PARAMETERS    [Toc]    [Back]

     geomx   expects a 4x4 matrix containing the x coordinates of the 16
	     control points of the patch.

     geomy   expects a 4x4 matrix containing the y coordinates of the 16
	     control points of the patch.

     geomz   expects a 4x4 matrix containing the z coordinates of the 16
	     control points of the patch.

     geomw   expects a 4x4 matrix containing the w coordinates of the 16
	     control points of the patch.

DESCRIPTION    [Toc]    [Back]

     rpatch draws a rational surface patch using the current patchbasis,
     patchprecision, and patchcurves which are defined earlier.	 The control
     points geomx, geomy, geomz	geomw determine	the shape of the patch.

     The patch is drawn	as a web of curve segments.  Each curve	segment	is
     approximated by a sequence	of straight lines.  All	lines use the current
     linestyle,	which is reset prior to	the first line of each curve segment,
     and continues through subsequent lines in each curve segment.  Other line
     modes, including depthcueing, line	width, and line	antialiasing, also
     apply to the lines	generated by patch.

SEE ALSO    [Toc]    [Back]

     defbasis, patch, patchbasis, patchcurves, patchprecision


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