patch(3G)

NAME
     patch - draws a surface patch

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

PARAMETERS
     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
     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
     defbasis, patchbasis, patchcurves, patchprecision, rpatch