/// <summary>
/// Creates a facetation of a simple swept solid from a list of curve loops.
/// </summary>
/// <param name="exporterIFC">The exporter.</param>
/// <param name="profileName">The profile name.</param>
/// <param name="profileCurveLoops">The profile curve loops.</param>
/// <param name="normal">The normal of the plane that the path lies on.</param>
/// <param name="directrix">The path curve.</param>
/// <returns>The list of facet handles.</returns>
public static HashSet <IFCAnyHandle> CreateSimpleSweptSolidAsBRep(ExporterIFC exporterIFC, string profileName, IList <CurveLoop> profileCurveLoops,
XYZ normal, Curve directrix)
{
// see definition of IfcSurfaceCurveSweptAreaSolid from
// http://www.buildingsmart-tech.org/ifc/IFC2x4/rc4/html/schema/ifcgeometricmodelresource/lexical/ifcsurfacecurvesweptareasolid.htm
HashSet <IFCAnyHandle> facetHnds = null;
if (!CanCreateSimpleSweptSolid(profileCurveLoops, normal, directrix))
{
return(facetHnds);
}
// An extra requirement, as we can't tessellate an unbound curve.
if (!directrix.IsBound)
{
return(facetHnds);
}
double originalStartParam = directrix.GetEndParameter(0);
Plane axisPlane, profilePlane;
CreateAxisAndProfileCurvePlanes(directrix, originalStartParam, out axisPlane, out profilePlane);
IList <CurveLoop> curveLoops = null;
try
{
// Check that curve loops are valid.
curveLoops = ExporterIFCUtils.ValidateCurveLoops(profileCurveLoops, profilePlane.Normal);
}
catch (Exception)
{
return(null);
}
if (curveLoops == null || curveLoops.Count == 0)
{
return(facetHnds);
}
// Tessellate the curve loops. We don't add the last point, as these should all be closed curves.
IList <IList <XYZ> > tessellatedOutline = new List <IList <XYZ> >();
foreach (CurveLoop curveLoop in curveLoops)
{
List <XYZ> tessellatedCurve = new List <XYZ>();
foreach (Curve curve in curveLoop)
{
if (curve is Line)
{
AddScaledPointToList(exporterIFC, tessellatedCurve, curve.GetEndPoint(0));
}
else
{
IList <XYZ> curveTessellation = CreateRoughTessellation(exporterIFC, curve);
tessellatedCurve.AddRange(curveTessellation);
}
}
if (tessellatedCurve.Count != 0)
{
tessellatedOutline.Add(tessellatedCurve);
}
}
IFCFile file = exporterIFC.GetFile();
IList <IList <IList <IFCAnyHandle> > > facetVertexHandles = new List <IList <IList <IFCAnyHandle> > >();
IList <IList <IFCAnyHandle> > tessellatedOutlineHandles = new List <IList <IFCAnyHandle> >();
foreach (IList <XYZ> tessellatedOutlinePolygon in tessellatedOutline)
{
IList <IFCAnyHandle> tessellatedOutlinePolygonHandles = new List <IFCAnyHandle>();
foreach (XYZ tessellatedOutlineXYZ in tessellatedOutlinePolygon)
{
tessellatedOutlinePolygonHandles.Add(ExporterUtil.CreateCartesianPoint(file, tessellatedOutlineXYZ));
}
tessellatedOutlineHandles.Add(tessellatedOutlinePolygonHandles);
}
facetVertexHandles.Add(tessellatedOutlineHandles);
// Tessellate the Directrix. This only works for bound Directrix curves. Unfortunately, we get XYZ values, which we will have to convert
// back to parameter values to get the local transform.
IList <double> tessellatedDirectrixParameters = CreateRoughParametricTessellation(directrix);
// Create all of the other outlines by transformng the first tessellated outline to the current transform.
Transform profilePlaneTrf = Transform.CreateTranslation(ExporterIFCUtils.TransformAndScalePoint(exporterIFC, profilePlane.Origin));
profilePlaneTrf.BasisX = ExporterIFCUtils.TransformAndScaleVector(exporterIFC, profilePlane.XVec);
profilePlaneTrf.BasisY = ExporterIFCUtils.TransformAndScaleVector(exporterIFC, profilePlane.YVec);
profilePlaneTrf.BasisZ = ExporterIFCUtils.TransformAndScaleVector(exporterIFC, profilePlane.Normal);
// The inverse transform will be applied to generate the delta transform for the profile curves from the start of the directrix
// to the current location. This could be optimized in the case of a Line, but current usage is really only for a single arc.
// If that changes, we should revisit optimization possibilities.
Transform profilePlaneTrfInverse = profilePlaneTrf.Inverse;
// Create the delta transforms and the offset tessellated profiles.
foreach (double parameter in tessellatedDirectrixParameters)
{
Transform directrixDirs = CreateProfileCurveTransform(exporterIFC, directrix, parameter);
Transform deltaTransform = directrixDirs.Multiply(profilePlaneTrfInverse);
IList <IList <IFCAnyHandle> > currTessellatedOutline = new List <IList <IFCAnyHandle> >();
foreach (IList <XYZ> pointLoop in tessellatedOutline)
{
IList <IFCAnyHandle> currTessellatedPoinLoop = new List <IFCAnyHandle>();
foreach (XYZ point in pointLoop)
{
XYZ transformedPoint = deltaTransform.OfPoint(point);
IFCAnyHandle transformedPointHandle = ExporterUtil.CreateCartesianPoint(file, transformedPoint);
currTessellatedPoinLoop.Add(transformedPointHandle);
}
currTessellatedOutline.Add(currTessellatedPoinLoop);
}
facetVertexHandles.Add(currTessellatedOutline);
}
// Create the side facets.
facetHnds = new HashSet <IFCAnyHandle>();
int numFacets = facetVertexHandles.Count - 1;
for (int ii = 0; ii < numFacets; ii++)
{
IList <IList <IFCAnyHandle> > firstOutline = facetVertexHandles[ii];
IList <IList <IFCAnyHandle> > secondOutline = facetVertexHandles[ii + 1];
int numLoops = firstOutline.Count;
for (int jj = 0; jj < numLoops; jj++)
{
IList <IFCAnyHandle> firstLoop = firstOutline[jj];
IList <IFCAnyHandle> secondLoop = secondOutline[jj];
int numVertices = firstLoop.Count;
for (int kk = 0; kk < numVertices; kk++)
{
IList <IFCAnyHandle> polyLoopHandles = new List <IFCAnyHandle>(4);
polyLoopHandles.Add(secondLoop[kk]);
polyLoopHandles.Add(secondLoop[(kk + 1) % numVertices]);
polyLoopHandles.Add(firstLoop[(kk + 1) % numVertices]);
polyLoopHandles.Add(firstLoop[kk]);
IFCAnyHandle face = BodyExporter.CreateFaceFromVertexList(file, polyLoopHandles);
facetHnds.Add(face);
}
}
}
// Create the end facets.
for (int ii = 0; ii < 2; ii++)
{
int faceIndex = (ii == 0) ? 0 : facetVertexHandles.Count - 1;
int numLoops = facetVertexHandles[faceIndex].Count;
HashSet <IFCAnyHandle> faceBounds = new HashSet <IFCAnyHandle>();
for (int jj = 0; jj < numLoops; jj++)
{
IList <IFCAnyHandle> polyLoopHandles = null;
if (ii == 0)
{
polyLoopHandles = facetVertexHandles[faceIndex][jj];
}
else
{
int numHandles = facetVertexHandles[faceIndex][jj].Count;
polyLoopHandles = new List <IFCAnyHandle>(numHandles);
for (int kk = numHandles - 1; kk >= 0; kk--)
{
polyLoopHandles.Add(facetVertexHandles[faceIndex][jj][kk]);
}
}
IFCAnyHandle polyLoop = IFCInstanceExporter.CreatePolyLoop(file, polyLoopHandles);
IFCAnyHandle faceBound = (jj == 0) ?
IFCInstanceExporter.CreateFaceOuterBound(file, polyLoop, true) :
IFCInstanceExporter.CreateFaceBound(file, polyLoop, true);
faceBounds.Add(faceBound);
}
IFCAnyHandle face = IFCInstanceExporter.CreateFace(file, faceBounds);
facetHnds.Add(face);
}
return(facetHnds);
}
