patch(3G)							     patch(3G)

NAME    [Toc]    [Back]

     patch - draws a surface patch

C SPECIFICATION    [Toc]    [Back]

     void patch(geomx, geomy, geomz)
     Matrix geomx, geomy, geomz;

PARAMETERS    [Toc]    [Back]

     geomx   expects the 4x4 matrix which contains the x coordinates of	the 16
	     control points of the patch.

     geomy   expects the 4x4 matrix which contains the y coordinates of	the 16
	     control points of the patch.

     geomz   expects the 4x4 matrix which contains the z coordinates of	the 16
	     control points of the patch.

DESCRIPTION    [Toc]    [Back]

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


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