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NAME SoNurbsSurface SoNurbs "" { NURBS surface shape node }
INCLUDE nodes/SoNurbsSurface.h
DESC {
This shape node represents a NURBS surface based on the node's knot
vectors and on control points constructed from the current
coordinates. The current coordinates are used in row-major order (the
V direction corresponds to the rows). The number of coordinates used
is determined by the \vnumUControlPoints\. and \vnumVControlPoints\.
fields. The \vuKnotVector\. and \vvKnotVector\. fields contain
floating point arrays of non-decreasing values.
\p
The order of the surface in the U and V directions is defined as the
number of knots minus the number of control points in the particular
direction. The largest order allowed for a NURBS surface is 8.
\p
The control points of the NURBS surface are transformed by the current
cumulative transformation. The surface is drawn with the current light
model and drawing style. The coordinates, normals, and texture
coordinates of a surface are generated, so you cannot bind explicit
normals or texture coordinates to a NURBS surface. The first material
in the state is applied to the entire surface.
\p
The surface is trimmed according to the currently defined profile's curves.
\p
When default texture coordinates are applied to a NURBS surface, the
edges of the texture square are stretched to fit the surface. The axes
of the texture are called S and T; S is horizontal and T is vertical.
The axes of the NURBS surface are called U and V; U is horizontal and
V is vertical. You can also define texture coordinates explicitly with
the S,T location point, the knot vectors, and the current texture
coordinates.
\p
The approximation of the surface by polygons is affected by the
current complexity value.
}
FIELD numUControlPoints {}
FIELD numVControlPoints { Number of control points in the U and V directions. }
FIELD numSControlPoints {}
FIELD numTControlPoints { Number of control points in the S and T directions. }
FIELD uKnotVector {}
FIELD vKnotVector { The knot vectors in the U and V directions. }
FIELD sKnotVector {}
FIELD tKnotVector { The knot vectors in the S and T directions. }
METHOD "" SoNurbsSurface() {
Creates a NURBS surface node with default settings.
}
METHOD "" static SoType getClassTypeId() {
Returns type identifier for this class.
}
ACTION SoGLRenderAction {
Draws the surface based on the current coordinates, material, and so on.
}
ACTION SoRayPickAction {
Picks the surface based on the current coordinates and transformation.
}
ACTION SoGetBoundingBoxAction {
Computes the bounding box that encloses all control points of the
surface with the current transformation applied to them. Sets the
center to the average of the control points.
}
ACTION SoCallbackAction {
If any triangle callbacks are registered with the action, they will be
invoked for each successive triangle approximating the surface.
}
ALSO {
SoIndexedNurbsSurface,
SoNurbsCurve,
SoProfile
}
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