GLUNURBSCURVE(3G) UNIX Programmer's Manual GLUNURBSCURVE(3G)
gluNurbsCurve - define the shape of a NURBS curve
void gluNurbsCurve( GLUnurbs* nurb,
GLint knotCount,
GLfloat *knots,
GLint stride,
GLfloat *control,
GLint order,
GLenum type )
nurb Specifies the NURBS object (created with
gluNewNurbsRenderer).
knotCount Specifies the number of knots in knots. knotCount
equals the number of control points plus the
order.
knots Specifies an array of knotCount nondecreasing
knot values.
stride Specifies the offset (as a number of single-
precision floating-point values) between succes-
sive curve control points.
control Specifies a pointer to an array of control
points. The coordinates must agree with type,
specified below.
order Specifies the order of the NURBS curve. order
equals degree + 1, hence a cubic curve has an
order of 4.
type Specifies the type of the curve. If this curve is
defined within a gluBeginCurve/gluEndCurve pair,
then the type can be any of the valid one-
dimensional evaluator types (such as
GL_MAP1_VERTEX_3 or GL_MAP1_COLOR_4). Between a
gluBeginTrim/gluEndTrim pair, the only valid
types are GLU_MAP1_TRIM_2 and GLU_MAP1_TRIM_3.
Use gluNurbsCurve to describe a NURBS curve.
When gluNurbsCurve appears between a
gluBeginCurve/gluEndCurve pair, it is used to describe a
curve to be rendered. Positional, texture, and color coordi-
nates are associated by presenting each as a separate
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GLUNURBSCURVE(3G) UNIX Programmer's Manual GLUNURBSCURVE(3G)
gluNurbsCurve between a gluBeginCurve/gluEndCurve pair. No
more than one call to gluNurbsCurve for each of color, posi-
tion, and texture data can be made within a single
gluBeginCurve/gluEndCurve pair. Exactly one call must be
made to describe the position of the curve (a type of
GL_MAP1_VERTEX_3 or GL_MAP1_VERTEX_4).
When gluNurbsCurve appears between a gluBeginTrim/gluEndTrim
pair, it is used to describe a trimming curve on a NURBS
surface. If type is GLU_MAP1_TRIM_2, then it describes a
curve in two-dimensional (u and v) parameter space. If it is
GLU_MAP1_TRIM_3, then it describes a curve in two-
dimensional homogeneous (u, v, and w) parameter space. See
the gluBeginTrim reference page for more discussion about
trimming curves.
The following commands render a textured NURBS curve with
normals:
gluBeginCurve(nobj);
gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
gluEndCurve(nobj);
To define trim curves which stitch well, use gluPwlCurve.
gluBeginCurve(3G), gluBeginTrim(3G),
gluNewNurbsRenderer(3G), gluPwlCurve(3G)
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