NAME

cxGeoPatchDefine - define a NURB spline patch

C SPECIFICATION

#include <cx/Geometry.h>

cxGeo cxGeoPatchDefine(
int nu,
int nv,
float *point,
int nku,
float *uknot,
int nkv,
float *vknot)

FORTRAN SPECIFICATION

integer function cxGeoPatchDefine(nu,nv,point,nku,uknot,nkv,vknot)
integer nu
integer nv
real point(4, nu, nv)
integer nku
float uknot(nku)
integer nkv
float vknot(nkv)

PARAMETERS

nu: Number of control points in the u direction.
nv: Number of control points in the v direction.
point: An nu*nv array of 4-vector (x,y,z,w) control points.
nku: Number of knots in the u direction.
uknot: The u knot vector.
nkv: Number of knots in the v direction.
vknot: The v knot vector.

DESCRIPTION

This function creates a non-uniform rational B-spline (NURBS) patch. The rational control points are specified in point and the knot vectors are defined in uknot and vknot. Note that the control points are 4-vectors, not 3-vectors as in other geometry routines. There should be nu*nv control points in the array point with nv major (varying fastest).

The return value is a tag for this object that may be used to reference it at a later time with cxGeoFocus(3E).

Valid attributes are color and transparency. Attribute distribution may be CX_GEO_PER_OBJECT.

NAME

C SPECIFICATION

FORTRAN SPECIFICATION

PARAMETERS

DESCRIPTION

SEE ALSO