Creating a NURBS Surface in CAA RADE

The following code uses the CATGeoFactory which inherits from the CATICGMContainer. This means that the geometry created is purely mathematical. It can only be viewed in CATIA by making it a Datum feature which allows it to be added to the procedural view. See [[Adding a Geometrical Object to a CATIA part]].

This code initializes the CATGeoFactory (a part must be open first):
CATDocument *pDoc = pEditor->GetDocument();
CATIContainerOfDocument_var spConODocs = pDoc;
CATIContainer* spCGMContainer;
HRESULT hr = spConODocs->GetResultContainer(spCGMContainer);
CATGeoFactory_var piGeomFactory = spCGMContainer;

This code creates the grid of points to be passed as the knot vector argument

int nbPoleU = 5;
int nbPoleV = 5;
CATMathGridOfPoints gridOfPoints(nbPoleU,nbPoleV);

// Row 0
gridOfPoints.SetPoint(CATMathPoint( 0., 0., 0.),0,0);
gridOfPoints.SetPoint(CATMathPoint(10., 0., 0.),0,1);
gridOfPoints.SetPoint(CATMathPoint(20., 0., 0.),0,2);
gridOfPoints.SetPoint(CATMathPoint(30., 0., 0.),0,3);
gridOfPoints.SetPoint(CATMathPoint(40., 0., 0.),0,4);

// Row 1
gridOfPoints.SetPoint(CATMathPoint( 0.,10., 0.),1,0);
gridOfPoints.SetPoint(CATMathPoint(10.,10.,-10.),1,1);
gridOfPoints.SetPoint(CATMathPoint(20.,10.,-10.),1,2);
gridOfPoints.SetPoint(CATMathPoint(30.,10.,-10.),1,3);
gridOfPoints.SetPoint(CATMathPoint(40.,10., 0.),1,4);

// Row 2
gridOfPoints.SetPoint(CATMathPoint( 0.,20., 0.),2,0);
gridOfPoints.SetPoint(CATMathPoint(10.,20.,-40.),2,1);
gridOfPoints.SetPoint(CATMathPoint(20.,20.,-40.),2,2);
gridOfPoints.SetPoint(CATMathPoint(30.,20., -40.),2,3);
gridOfPoints.SetPoint(CATMathPoint(40.,20., 0.),2,4);

// Row 4
gridOfPoints.SetPoint(CATMathPoint( 0.,30., 0.),3,0);
gridOfPoints.SetPoint(CATMathPoint(10.,30., -10.),3,1);
gridOfPoints.SetPoint(CATMathPoint(20.,30., -10.),3,2);
gridOfPoints.SetPoint(CATMathPoint(30.,30., -10.),3,3);
gridOfPoints.SetPoint(CATMathPoint(40.,30., 0.),3,4);

// Row 5
gridOfPoints.SetPoint(CATMathPoint( 0.,40., 0.),4,0);
gridOfPoints.SetPoint(CATMathPoint(10.,40., 0.),4,1);
gridOfPoints.SetPoint(CATMathPoint(20.,40., 0.),4,2);
gridOfPoints.SetPoint(CATMathPoint(30.,40., 0.),4,3);
gridOfPoints.SetPoint(CATMathPoint(40.,40., 0.),4,4);

This code creates the knot vectors:
CATLONG32 IsPeriodic= 0;
CATLONG32 Degree= 4;
CATLONG32 KnotsCount= 2;
double Knots[]= {0.,10.};
CATLONG32 Multiplicities[]= {5,5};
CATLONG32 IndexOffset= 1;

CATKnotVector NonUniformU(Degree,IsPeriodic,KnotsCount,Knots,
Multiplicities,IndexOffset);
CATKnotVector NonUniformV(Degree,IsPeriodic,KnotsCount,Knots,
Multiplicities,IndexOffset);
This code creates the NURBS surface:
CATLONG32 isRational=1;
double * aWeights=new double[nbPoleU*nbPoleV];
for (int i = 0; i {
aWeights[i] = 1.;
}

CATNurbsSurface * piSurf1 = piGeomFactory->
CATCreateNurbsSurface(NonUniformU, NonUniformV,isRational,gridOfPoints,aWeights);

delete [] aWeights;
aWeights = NULL;