NRBEVAL: Evaluate a NURBS at parameteric points.
Calling Sequence:
[p,w] = nrbeval(crv,ut)
[p,w] = nrbeval(srf,{ut,vt})
Parameters:
crv : NURBS curve, see nrbmak.
srf : NURBS surface, see nrbmak.
ut : Parametric evaluation points along U direction.
vt : Parametric evaluation points along V direction.
p : Evaluated points on the NURBS curve or surface as cartesian
coordinates (x,y,z). If w is included on the lhs argument list
the points are returned as homogeneous coordinates (wx,wy,wz).
w : Weights of the homogeneous coordinates of the evaluated
points. Note inclusion of this argument changes the type
of coordinates returned in p (see above).
Description:
Evaluation of NURBS curves or surfaces at parametric points along the
U and V directions. Either homogeneous coordinates are returned if the
weights are requested in the lhs arguments, or as cartesian coordinates.
This function utilises the 'C' interface bspeval.
Examples:
Evaluate the NURBS circle at twenty points from 0.0 to 1.0
nrb = nrbcirc;
ut = linspace(0.0,1.0,20);
p = nrbeval(nrb,ut);
See:
bspeval