protected override void Process(IFCAnyHandle ifcCurve)
{
base.Process(ifcCurve);
KnotMultiplicities = IFCAnyHandleUtil.GetAggregateIntAttribute <List <int> >(ifcCurve, "KnotMultiplicities");
Knots = IFCAnyHandleUtil.GetAggregateDoubleAttribute <List <double> >(ifcCurve, "Knots");
if (KnotMultiplicities == null || Knots == null)
{
Importer.TheLog.LogError(ifcCurve.StepId, "Cannot find the KnotMultiplicities or Knots attribute of this IfcBSplineCurveWithKnots", true);
}
if (KnotMultiplicities.Count != Knots.Count)
{
Importer.TheLog.LogError(ifcCurve.StepId, "The number of knots and knot multiplicities are not the same", true);
}
IList <double> revitKnots = IFCGeometryUtil.ConvertIFCKnotsToRevitKnots(KnotMultiplicities, Knots);
Curve nurbsSpline = NurbSpline.CreateCurve(Degree, revitKnots, ControlPointsList);
SetCurve(nurbsSpline);
if (nurbsSpline == null)
{
Importer.TheLog.LogWarning(ifcCurve.StepId, "Cannot get the curve representation of this IfcCurve", false);
}
}
private BRepBuilderSurfaceGeometry StartCollectingNURBSFace(IFCBSplineSurfaceWithKnots bSplineSurfaceWithKnots, Transform localTransform)
{
if (bSplineSurfaceWithKnots == null)
{
return(null);
}
IFCRationalBSplineSurfaceWithKnots rationalBSplineSurfaceWithKnots = (bSplineSurfaceWithKnots as IFCRationalBSplineSurfaceWithKnots);
IList <double> knotsU = IFCGeometryUtil.ConvertIFCKnotsToRevitKnots(bSplineSurfaceWithKnots.UMultiplicities, bSplineSurfaceWithKnots.UKnots);
if (knotsU == null || knotsU.Count == 0)
{
throw new InvalidOperationException("No knots in u-direction");
}
IList <double> knotsV = IFCGeometryUtil.ConvertIFCKnotsToRevitKnots(bSplineSurfaceWithKnots.VMultiplicities, bSplineSurfaceWithKnots.VKnots);
if (knotsV == null || knotsV.Count == 0)
{
throw new InvalidOperationException("No knots in v-direction");
}
IList <double> weights = (rationalBSplineSurfaceWithKnots != null) ? rationalBSplineSurfaceWithKnots.WeightsList : null;
IList <XYZ> controlPoints = new List <XYZ>();
foreach (XYZ point in bSplineSurfaceWithKnots.ControlPointsList)
{
controlPoints.Add(localTransform.OfPoint(point));
}
int uDegree = bSplineSurfaceWithKnots.UDegree;
int vDegree = bSplineSurfaceWithKnots.VDegree;
BRepBuilderSurfaceGeometry surfaceGeometry = null;
if (weights == null)
{
surfaceGeometry = BRepBuilderSurfaceGeometry.CreateNURBSSurface(uDegree, vDegree, knotsU, knotsV, controlPoints, false, null);
}
else
{
surfaceGeometry = BRepBuilderSurfaceGeometry.CreateNURBSSurface(uDegree, vDegree, knotsU, knotsV, controlPoints, weights, false, null);
}
return(surfaceGeometry);
}