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nrbeval

PURPOSE ^

SYNOPSIS ^

function [p,w] = nrbeval(nurbs,tt)

DESCRIPTION ^

 
 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

CROSS-REFERENCE INFORMATION ^

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