/// <summary>
/// Exports list of geometries to IFC body representation.
/// </summary>
/// <param name="exporterIFC">The ExporterIFC object.</param>
/// <param name="categoryId">The category id.</param>
/// <param name="geometryListIn">The geometry list.</param>
/// <param name="options">The settings for how to export the body.</param>
/// <param name="exportBodyParams">The extrusion creation data.</param>
/// <returns>The BodyData containing the handle, offset and material ids.</returns>
public static BodyData ExportBody(ExporterIFC exporterIFC,
Element element,
ElementId categoryId,
ElementId overrideMaterialId,
IList<GeometryObject> geometryList,
BodyExporterOptions options,
IFCExtrusionCreationData exportBodyParams)
{
BodyData bodyData = new BodyData();
if (geometryList.Count == 0)
return bodyData;
Document document = element.Document;
bool tryToExportAsExtrusion = options.TryToExportAsExtrusion;
bool canExportSolidModelRep = tryToExportAsExtrusion && ExporterCacheManager.ExportOptionsCache.CanExportSolidModelRep;
bool useCoarseTessellation = (ExporterCacheManager.ExportOptionsCache.LevelOfDetail < 4);
bool allowAdvancedBReps = ExporterCacheManager.ExportOptionsCache.ExportAs4 && !ExporterCacheManager.ExportOptionsCache.ExportAs4ReferenceView;
// We will try to export as a swept solid if the option is set, and we are either exporting to a schema that allows it,
// or we are using a coarse tessellation, in which case we will export the swept solid as an optimzed BRep.
bool tryToExportAsSweptSolid = options.TryToExportAsSweptSolid && (allowAdvancedBReps || useCoarseTessellation);
// We will allow exporting swept solids as BReps or TriangulatedFaceSet if we are exporting to a schema before IFC4, or to a Reference View MVD,
// and we allow coarse representations. In the future, we may allow more control here.
// Note that we disable IFC4 because in IFC4, we will export it as a true swept solid instead, except for the Reference View MVD.
bool tryToExportAsSweptSolidAsTessellation = tryToExportAsSweptSolid && useCoarseTessellation && !allowAdvancedBReps;
IFCFile file = exporterIFC.GetFile();
IFCAnyHandle contextOfItems = exporterIFC.Get3DContextHandle("Body");
double eps = UnitUtil.ScaleLength(element.Document.Application.VertexTolerance);
bool allFaces = true;
foreach (GeometryObject geomObject in geometryList)
{
if (!(geomObject is Face))
{
allFaces = false;
break;
}
}
IList<IFCAnyHandle> bodyItems = new List<IFCAnyHandle>();
IList<ElementId> materialIdsForExtrusions = new List<ElementId>();
// This is a list of geometries that can be exported using the coarse facetation of the SweptSolidExporter.
IList<KeyValuePair<int, SimpleSweptSolidAnalyzer>> exportAsBRep = new List<KeyValuePair<int, SimpleSweptSolidAnalyzer>>();
IList<int> exportAsSweptSolid = new List<int>();
IList<int> exportAsExtrusion = new List<int>();
bool hasExtrusions = false;
bool hasSweptSolids = false;
bool hasSweptSolidsAsBReps = false;
ShapeRepresentationType hasRepresentationType = ShapeRepresentationType.Undefined;
BoundingBoxXYZ bbox = GeometryUtil.GetBBoxOfGeometries(geometryList);
XYZ unscaledTrfOrig = new XYZ();
int numItems = geometryList.Count;
bool tryExtrusionAnalyzer = tryToExportAsExtrusion && (options.ExtrusionLocalCoordinateSystem != null) && (numItems == 1) && (geometryList[0] is Solid);
bool supportOffsetTransformForExtrusions = !(tryExtrusionAnalyzer || tryToExportAsSweptSolidAsTessellation);
bool useOffsetTransformForExtrusions = (options.AllowOffsetTransform && supportOffsetTransformForExtrusions && (exportBodyParams != null));
using (IFCTransaction tr = new IFCTransaction(file))
{
// generate "bottom corner" of bbox; create new local placement if passed in.
// need to transform, but not scale, this point to make it the new origin.
using (TransformSetter transformSetter = TransformSetter.Create())
{
if (useOffsetTransformForExtrusions)
bodyData.OffsetTransform = transformSetter.InitializeFromBoundingBox(exporterIFC, bbox, exportBodyParams, out unscaledTrfOrig);
// If we passed in an ExtrusionLocalCoordinateSystem, and we have 1 Solid, we will try to create an extrusion using the ExtrusionAnalyzer.
// If we succeed, we will skip the rest of the routine, otherwise we will try with the backup extrusion method.
// This doesn't yet create fallback information for solid models that are hybrid extrusions and BReps.
if (tryToExportAsExtrusion)
{
if (tryExtrusionAnalyzer)
{
using (IFCTransaction extrusionTransaction = new IFCTransaction(file))
{
Plane extrusionPlane = new Plane(
options.ExtrusionLocalCoordinateSystem.BasisY,
options.ExtrusionLocalCoordinateSystem.BasisZ,
options.ExtrusionLocalCoordinateSystem.Origin);
XYZ extrusionDirection = options.ExtrusionLocalCoordinateSystem.BasisX;
bool completelyClipped;
HandleAndData extrusionData = ExtrusionExporter.CreateExtrusionWithClippingAndProperties(exporterIFC, element,
CategoryUtil.GetSafeCategoryId(element), geometryList[0] as Solid, extrusionPlane,
extrusionDirection, null, out completelyClipped);
if (!completelyClipped && !IFCAnyHandleUtil.IsNullOrHasNoValue(extrusionData.Handle) && extrusionData.BaseExtrusions != null && extrusionData.BaseExtrusions.Count == 1)
{
HashSet<ElementId> materialIds = extrusionData.MaterialIds;
// We skip setting and getting the material id from the exporter as unnecessary.
ElementId matIdFromGeom = (materialIds != null && materialIds.Count > 0) ? materialIds.First() : ElementId.InvalidElementId;
ElementId matId = (overrideMaterialId != ElementId.InvalidElementId) ? overrideMaterialId : matIdFromGeom;
bodyItems.Add(extrusionData.BaseExtrusions[0]);
materialIdsForExtrusions.Add(matId);
if (matId != ElementId.InvalidElementId)
bodyData.AddMaterial(matId);
bodyData.RepresentationHnd = extrusionData.Handle;
bodyData.ShapeRepresentationType = extrusionData.ShapeRepresentationType;
if (exportBodyParams != null && extrusionData.Data != null)
{
exportBodyParams.Slope = extrusionData.Data.Slope;
exportBodyParams.ScaledLength = extrusionData.Data.ScaledLength;
exportBodyParams.ExtrusionDirection = extrusionData.Data.ExtrusionDirection;
exportBodyParams.ScaledHeight = extrusionData.Data.ScaledHeight;
exportBodyParams.ScaledWidth = extrusionData.Data.ScaledWidth;
exportBodyParams.ScaledArea = extrusionData.Data.ScaledArea;
exportBodyParams.ScaledInnerPerimeter = extrusionData.Data.ScaledInnerPerimeter;
exportBodyParams.ScaledOuterPerimeter = extrusionData.Data.ScaledOuterPerimeter;
}
hasExtrusions = true;
extrusionTransaction.Commit();
}
else
{
extrusionTransaction.RollBack();
}
}
}
// Only try if ExtrusionAnalyzer wasn't called, or failed.
if (!hasExtrusions)
{
// Check to see if we have Geometries or GFaces.
// We will have the specific all GFaces case and then the generic case.
IList<Face> faces = null;
if (allFaces)
{
faces = new List<Face>();
foreach (GeometryObject geometryObject in geometryList)
{
faces.Add(geometryObject as Face);
}
}
// Options used if we try to export extrusions.
IFCExtrusionAxes axesToExtrudeIn = exportBodyParams != null ? exportBodyParams.PossibleExtrusionAxes : IFCExtrusionAxes.TryDefault;
XYZ directionToExtrudeIn = XYZ.Zero;
if (exportBodyParams != null && exportBodyParams.HasCustomAxis)
directionToExtrudeIn = exportBodyParams.CustomAxis;
double lengthScale = UnitUtil.ScaleLengthForRevitAPI();
IFCExtrusionCalculatorOptions extrusionOptions =
new IFCExtrusionCalculatorOptions(exporterIFC, axesToExtrudeIn, directionToExtrudeIn, lengthScale);
int numExtrusionsToCreate = allFaces ? 1 : geometryList.Count;
IList<IList<IFCExtrusionData>> extrusionLists = new List<IList<IFCExtrusionData>>();
for (int ii = 0; ii < numExtrusionsToCreate; ii++)
{
IList<IFCExtrusionData> extrusionList = new List<IFCExtrusionData>();
if (tryToExportAsExtrusion)
{
if (allFaces)
extrusionList = IFCExtrusionCalculatorUtils.CalculateExtrusionData(extrusionOptions, faces);
else
extrusionList = IFCExtrusionCalculatorUtils.CalculateExtrusionData(extrusionOptions, geometryList[ii]);
}
if (extrusionList.Count == 0)
{
// If we are trying to create swept solids, we will keep going, but we won't try to create more extrusions unless we are also exporting a solid model.
if (tryToExportAsSweptSolid)
{
if (!canExportSolidModelRep)
tryToExportAsExtrusion = false;
exportAsSweptSolid.Add(ii);
}
else if (!canExportSolidModelRep)
{
tryToExportAsExtrusion = false;
break;
}
else
exportAsBRep.Add(new KeyValuePair<int, SimpleSweptSolidAnalyzer>(ii, null));
}
else
{
extrusionLists.Add(extrusionList);
exportAsExtrusion.Add(ii);
}
}
int numCreatedExtrusions = extrusionLists.Count;
for (int ii = 0; ii < numCreatedExtrusions && tryToExportAsExtrusion; ii++)
{
int geomIndex = exportAsExtrusion[ii];
ElementId matId = SetBestMaterialIdInExporter(geometryList[geomIndex], element, overrideMaterialId, exporterIFC);
if (matId != ElementId.InvalidElementId)
bodyData.AddMaterial(matId);
if (exportBodyParams != null && exportBodyParams.AreInnerRegionsOpenings)
{
IList<CurveLoop> curveLoops = extrusionLists[ii][0].GetLoops();
XYZ extrudedDirection = extrusionLists[ii][0].ExtrusionDirection;
int numLoops = curveLoops.Count;
for (int jj = numLoops - 1; jj > 0; jj--)
{
ExtrusionExporter.AddOpeningData(exportBodyParams, extrusionLists[ii][0], curveLoops[jj]);
extrusionLists[ii][0].RemoveLoopAt(jj);
}
}
bool exportedAsExtrusion = false;
IFCExtrusionBasis whichBasis = extrusionLists[ii][0].ExtrusionBasis;
if (whichBasis >= 0)
{
IFCAnyHandle extrusionHandle = ExtrusionExporter.CreateExtrudedSolidFromExtrusionData(exporterIFC, element, extrusionLists[ii][0]);
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(extrusionHandle))
{
bodyItems.Add(extrusionHandle);
materialIdsForExtrusions.Add(exporterIFC.GetMaterialIdForCurrentExportState());
IList<CurveLoop> curveLoops = extrusionLists[ii][0].GetLoops();
XYZ extrusionDirection = extrusionLists[ii][0].ExtrusionDirection;
if (exportBodyParams != null)
{
exportBodyParams.Slope = GeometryUtil.GetSimpleExtrusionSlope(extrusionDirection, whichBasis);
exportBodyParams.ScaledLength = extrusionLists[ii][0].ScaledExtrusionLength;
exportBodyParams.ExtrusionDirection = extrusionDirection;
for (int kk = 1; kk < extrusionLists[ii].Count; kk++)
{
ExtrusionExporter.AddOpeningData(exportBodyParams, extrusionLists[ii][kk]);
}
Plane plane = null;
double height = 0.0, width = 0.0;
if (ExtrusionExporter.ComputeHeightWidthOfCurveLoop(curveLoops[0], plane, out height, out width))
{
exportBodyParams.ScaledHeight = UnitUtil.ScaleLength(height);
exportBodyParams.ScaledWidth = UnitUtil.ScaleLength(width);
}
double area = ExporterIFCUtils.ComputeAreaOfCurveLoops(curveLoops);
if (area > 0.0)
{
exportBodyParams.ScaledArea = UnitUtil.ScaleArea(area);
}
double innerPerimeter = ExtrusionExporter.ComputeInnerPerimeterOfCurveLoops(curveLoops);
double outerPerimeter = ExtrusionExporter.ComputeOuterPerimeterOfCurveLoops(curveLoops);
if (innerPerimeter > 0.0)
exportBodyParams.ScaledInnerPerimeter = UnitUtil.ScaleLength(innerPerimeter);
if (outerPerimeter > 0.0)
exportBodyParams.ScaledOuterPerimeter = UnitUtil.ScaleLength(outerPerimeter);
}
exportedAsExtrusion = true;
hasExtrusions = true;
}
}
if (!exportedAsExtrusion)
{
if (tryToExportAsSweptSolid)
exportAsSweptSolid.Add(ii);
else if (!canExportSolidModelRep)
{
tryToExportAsExtrusion = false;
break;
}
else
exportAsBRep.Add(new KeyValuePair<int, SimpleSweptSolidAnalyzer>(ii, null));
}
}
}
}
if (tryToExportAsSweptSolid)
{
int numCreatedSweptSolids = exportAsSweptSolid.Count;
for (int ii = 0; (ii < numCreatedSweptSolids) && tryToExportAsSweptSolid; ii++)
{
bool exported = false;
int geomIndex = exportAsSweptSolid[ii];
Solid solid = geometryList[geomIndex] as Solid;
SimpleSweptSolidAnalyzer simpleSweptSolidAnalyzer = null;
// TODO: allFaces to SweptSolid
if (solid != null)
{
// TODO: give normal hint below if we have an idea.
simpleSweptSolidAnalyzer = SweptSolidExporter.CanExportAsSweptSolid(exporterIFC, solid, null);
// If we are exporting as a BRep, we will keep the analyzer for later, if it isn't null.
if (simpleSweptSolidAnalyzer != null)
{
if (!tryToExportAsSweptSolidAsTessellation)
{
SweptSolidExporter sweptSolidExporter = SweptSolidExporter.Create(exporterIFC, element, simpleSweptSolidAnalyzer, solid);
IFCAnyHandle sweptHandle = (sweptSolidExporter != null) ? sweptSolidExporter.RepresentationItem : null;
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(sweptHandle))
{
bodyItems.Add(sweptHandle);
materialIdsForExtrusions.Add(exporterIFC.GetMaterialIdForCurrentExportState());
exported = true;
hasRepresentationType = sweptSolidExporter.RepresentationType;
// These are the only two valid cases for true sweep export: either an extrusion or a sweep.
// We don't expect regular BReps or triangulated face sets here.
if (sweptSolidExporter.isSpecificRepresentationType(ShapeRepresentationType.SweptSolid))
hasExtrusions = true;
else if (sweptSolidExporter.isSpecificRepresentationType(ShapeRepresentationType.AdvancedSweptSolid))
hasSweptSolids = true;
}
else
simpleSweptSolidAnalyzer = null; // Didn't work for some reason.
}
}
}
if (!exported)
{
exportAsBRep.Add(new KeyValuePair<int, SimpleSweptSolidAnalyzer>(geomIndex, simpleSweptSolidAnalyzer));
hasSweptSolidsAsBReps |= (simpleSweptSolidAnalyzer != null);
}
}
}
bool exportSucceeded = (exportAsBRep.Count == 0) && (tryToExportAsExtrusion || tryToExportAsSweptSolid)
&& (hasExtrusions || hasSweptSolids || hasRepresentationType != ShapeRepresentationType.Undefined);
if (exportSucceeded || canExportSolidModelRep)
{
int sz = bodyItems.Count();
for (int ii = 0; ii < sz; ii++)
BodyExporter.CreateSurfaceStyleForRepItem(exporterIFC, document, bodyItems[ii], materialIdsForExtrusions[ii]);
if (exportSucceeded)
{
if (bodyData.RepresentationHnd == null)
{
HashSet<IFCAnyHandle> bodyItemSet = new HashSet<IFCAnyHandle>();
bodyItemSet.UnionWith(bodyItems);
if (hasExtrusions && !hasSweptSolids)
{
bodyData.RepresentationHnd =
RepresentationUtil.CreateSweptSolidRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, bodyData.RepresentationHnd);
bodyData.ShapeRepresentationType = ShapeRepresentationType.SweptSolid;
}
else if (hasSweptSolids && !hasExtrusions)
{
bodyData.RepresentationHnd =
RepresentationUtil.CreateAdvancedSweptSolidRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, bodyData.RepresentationHnd);
bodyData.ShapeRepresentationType = ShapeRepresentationType.AdvancedSweptSolid;
}
else if (hasRepresentationType == ShapeRepresentationType.Tessellation)
{
bodyData.RepresentationHnd =
RepresentationUtil.CreateTessellatedRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, bodyData.RepresentationHnd);
bodyData.ShapeRepresentationType = ShapeRepresentationType.Tessellation;
}
else
{
bodyData.RepresentationHnd =
RepresentationUtil.CreateSolidModelRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet);
bodyData.ShapeRepresentationType = ShapeRepresentationType.SolidModel;
}
}
// TODO: include BRep, CSG, Clipping
XYZ lpOrig = ((bodyData != null) && (bodyData.OffsetTransform != null)) ? bodyData.OffsetTransform.Origin : new XYZ();
transformSetter.CreateLocalPlacementFromOffset(exporterIFC, bbox, exportBodyParams, lpOrig, unscaledTrfOrig);
tr.Commit();
return bodyData;
}
}
// If we are going to export a solid model, keep the created items.
if (!canExportSolidModelRep)
tr.RollBack();
else
tr.Commit();
}
// We couldn't export it as an extrusion; export as a solid, brep, or a surface model.
if (!canExportSolidModelRep)
{
exportAsExtrusion.Clear();
bodyItems.Clear();
if (exportBodyParams != null)
exportBodyParams.ClearOpenings();
}
if (exportAsExtrusion.Count == 0)
{
// We used to clear exportAsBRep, but we need the SimpleSweptSolidAnalyzer information, so we will fill out the rest.
int numGeoms = geometryList.Count;
IList<KeyValuePair<int, SimpleSweptSolidAnalyzer>> newExportAsBRep = new List<KeyValuePair<int, SimpleSweptSolidAnalyzer>>(numGeoms);
int exportAsBRepCount = exportAsBRep.Count;
int currIndex = 0;
for (int ii = 0; ii < numGeoms; ii++)
{
if ((currIndex < exportAsBRepCount) && (ii == exportAsBRep[currIndex].Key))
{
newExportAsBRep.Add(exportAsBRep[currIndex]);
currIndex++;
}
else
newExportAsBRep.Add(new KeyValuePair<int, SimpleSweptSolidAnalyzer>(ii, null));
}
exportAsBRep = newExportAsBRep;
}
}
// If we created some extrusions that we are using (e.g., creating a solid model), and we didn't use an offset transform for the extrusions, don't do it here either.
bool supportOffsetTransformForBreps = !hasSweptSolidsAsBReps;
bool disallowOffsetTransformForBreps = (exportAsExtrusion.Count > 0) && !useOffsetTransformForExtrusions;
bool useOffsetTransformForBReps = options.AllowOffsetTransform && supportOffsetTransformForBreps && !disallowOffsetTransformForBreps;
using (IFCTransaction tr = new IFCTransaction(file))
{
using (TransformSetter transformSetter = TransformSetter.Create())
{
// Need to do extra work to support offset transforms if we are using the sweep analyzer.
if (useOffsetTransformForBReps)
bodyData.OffsetTransform = transformSetter.InitializeFromBoundingBox(exporterIFC, bbox, exportBodyParams, out unscaledTrfOrig);
BodyData brepBodyData =
ExportBodyAsBRep(exporterIFC, geometryList, exportAsBRep, bodyItems, element, categoryId, overrideMaterialId, contextOfItems, eps, options, bodyData);
if (brepBodyData == null)
tr.RollBack();
else
{
XYZ lpOrig = ((bodyData != null) && (bodyData.OffsetTransform != null)) ? bodyData.OffsetTransform.Origin : new XYZ();
transformSetter.CreateLocalPlacementFromOffset(exporterIFC, bbox, exportBodyParams, lpOrig, unscaledTrfOrig);
tr.Commit();
}
return brepBodyData;
}
}
}
// NOTE: the useMappedGeometriesIfPossible and useGroupsIfPossible options are experimental and do not yet work well.
// In shipped code, these are always false, and should be kept false until API support routines are proved to be reliable.
private static BodyData ExportBodyAsBRep(ExporterIFC exporterIFC, IList<GeometryObject> splitGeometryList,
IList<KeyValuePair<int, SimpleSweptSolidAnalyzer>> exportAsBRep, IList<IFCAnyHandle> bodyItems,
Element element, ElementId categoryId, ElementId overrideMaterialId, IFCAnyHandle contextOfItems, double eps,
BodyExporterOptions options, BodyData bodyDataIn)
{
bool exportAsBReps = true;
bool hasTriangulatedGeometry = false;
bool hasAdvancedBrepGeometry = false;
IFCFile file = exporterIFC.GetFile();
Document document = element.Document;
// Can't use the optimization functions below if we already have partially populated our body items with extrusions.
int numExtrusions = bodyItems.Count;
bool useMappedGeometriesIfPossible = options.UseMappedGeometriesIfPossible && (numExtrusions != 0);
bool useGroupsIfPossible = options.UseGroupsIfPossible && (numExtrusions != 0);
IList<HashSet<IFCAnyHandle>> currentFaceHashSetList = new List<HashSet<IFCAnyHandle>>();
IList<int> startIndexForObject = new List<int>();
BodyData bodyData = new BodyData(bodyDataIn);
IDictionary<SolidMetrics, HashSet<Solid>> solidMappingGroups = null;
IList<KeyValuePair<int, Transform>> solidMappings = null;
IList<ElementId> materialIds = new List<ElementId>();
// This should currently be always false in shipped code.
if (useMappedGeometriesIfPossible)
{
IList<GeometryObject> newGeometryList = null;
useMappedGeometriesIfPossible = GatherMappedGeometryGroupings(splitGeometryList, out newGeometryList, out solidMappingGroups, out solidMappings);
if (useMappedGeometriesIfPossible && (newGeometryList != null))
splitGeometryList = newGeometryList;
}
BodyGroupKey groupKey = null;
BodyGroupData groupData = null;
// This should currently be always false in shipped code.
if (useGroupsIfPossible)
{
BodyData bodyDataOut = null;
useGroupsIfPossible = ProcessGroupMembership(exporterIFC, file, element, categoryId, contextOfItems, splitGeometryList, bodyData,
out groupKey, out groupData, out bodyDataOut);
if (bodyDataOut != null)
return bodyDataOut;
if (useGroupsIfPossible)
useMappedGeometriesIfPossible = true;
}
bool isCoarse = (options.TessellationLevel == BodyExporterOptions.BodyTessellationLevel.Coarse);
int numBRepsToExport = exportAsBRep.Count;
bool selectiveBRepExport = (numBRepsToExport > 0);
int numGeoms = selectiveBRepExport ? numBRepsToExport : splitGeometryList.Count;
bool canExportAsAdvancedGeometry = ExporterCacheManager.ExportOptionsCache.ExportAs4DesignTransferView;
bool canExportAsTessellatedFaceSet = ExporterCacheManager.ExportOptionsCache.ExportAs4ReferenceView;
// We will cycle through all of the geometries one at a time, doing the best export we can for each.
for (int index = 0; index < numGeoms; index++)
{
int brepIndex = selectiveBRepExport ? exportAsBRep[index].Key : index;
SimpleSweptSolidAnalyzer currAnalyzer = selectiveBRepExport ? exportAsBRep[index].Value : null;
GeometryObject geomObject = selectiveBRepExport ? splitGeometryList[brepIndex] : splitGeometryList[index];
// A simple test to see if the geometry is a valid solid. This will save a lot of time in CanCreateClosedShell later.
if (exportAsBReps && (geomObject is Solid))
{
try
{
// We don't care what the value is here. What we care about is whether or not it can be calculated. If it can't be calculated,
// it is probably not a valid solid.
double volume = (geomObject as Solid).Volume;
// Current code should already prevent 0 volume solids from coming here, but may as well play it safe.
if (volume <= MathUtil.Eps())
exportAsBReps = false;
}
catch
{
exportAsBReps = false;
}
}
startIndexForObject.Add(currentFaceHashSetList.Count);
ElementId materialId = SetBestMaterialIdInExporter(geomObject, element, overrideMaterialId, exporterIFC);
materialIds.Add(materialId);
bodyData.AddMaterial(materialId);
bool alreadyExported = false;
// First, see if this could be represented as a simple swept solid.
if (exportAsBReps && (currAnalyzer != null))
{
SweptSolidExporter sweptSolidExporter = SweptSolidExporter.Create(exporterIFC, element, currAnalyzer, geomObject);
HashSet<IFCAnyHandle> facetHnds = (sweptSolidExporter != null) ? sweptSolidExporter.Facets : null;
if (facetHnds != null && facetHnds.Count != 0)
{
currentFaceHashSetList.Add(facetHnds);
alreadyExported = true;
}
}
// Next, try to represent as an AdvancedBRep.
if (!alreadyExported && canExportAsAdvancedGeometry)
{
IFCAnyHandle advancedBrepBodyItem = ExportBodyAsAdvancedBrep(exporterIFC, element, options, geomObject);
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(advancedBrepBodyItem))
{
bodyItems.Add(advancedBrepBodyItem);
alreadyExported = true;
hasAdvancedBrepGeometry = true;
}
}
// If we are using the Reference View, try a triangulated face set.
// In theory, we could export a tessellated face set for geometry in the Design Transfer View that failed above.
// However, FacetedBReps do hold more information (and aren't only triangles).
if (!alreadyExported && canExportAsTessellatedFaceSet)
{
IFCAnyHandle triangulatedBodyItem = ExportBodyAsTriangulatedFaceSet(exporterIFC, element, options, geomObject);
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(triangulatedBodyItem))
{
bodyItems.Add(triangulatedBodyItem);
alreadyExported = true;
hasTriangulatedGeometry = true;
}
// We should log here that we couldn't export a geometry. We aren't allowed to use the traditional methods below.
if (!alreadyExported)
continue;
}
// If the above options do not generate any body, do the traditional step for Brep
if (!alreadyExported && (exportAsBReps || isCoarse))
alreadyExported = ExportBodyAsSolid(exporterIFC, element, options, currentFaceHashSetList, geomObject);
// If all else fails, use the internal routine to go through the faces. This will likely create a surface model.
if (!alreadyExported)
{
IFCGeometryInfo faceListInfo = IFCGeometryInfo.CreateFaceGeometryInfo(eps, isCoarse);
ExporterIFCUtils.CollectGeometryInfo(exporterIFC, faceListInfo, geomObject, XYZ.Zero, false);
IList<ICollection<IFCAnyHandle>> faceSetList = faceListInfo.GetFaces();
int numBReps = faceSetList.Count;
if (numBReps == 0)
continue;
foreach (ICollection<IFCAnyHandle> currentFaceSet in faceSetList)
{
if (currentFaceSet.Count == 0)
continue;
if (exportAsBReps)
{
bool canExportAsClosedShell = (currentFaceSet.Count >= 4);
if (canExportAsClosedShell)
{
if ((geomObject is Mesh) && (numBReps == 1))
{
// use optimized version.
canExportAsClosedShell = CanCreateClosedShell(geomObject as Mesh);
}
else
{
canExportAsClosedShell = CanCreateClosedShell(currentFaceSet);
}
}
if (!canExportAsClosedShell)
{
exportAsBReps = false;
// We'll need to invalidate the extrusions we created and replace them with BReps.
if (selectiveBRepExport && (numGeoms != splitGeometryList.Count))
{
for (int fixIndex = 0; fixIndex < numExtrusions; fixIndex++)
{
bodyItems[0].Delete();
bodyItems.RemoveAt(0);
}
numExtrusions = 0;
numGeoms = splitGeometryList.Count;
int currBRepIndex = 0;
for (int fixIndex = 0; fixIndex < numGeoms; fixIndex++)
{
bool outOfRange = (currBRepIndex >= numBRepsToExport);
if (!outOfRange && (exportAsBRep[currBRepIndex].Key == fixIndex))
{
currBRepIndex++;
continue;
}
SimpleSweptSolidAnalyzer fixAnalyzer = outOfRange ? null : exportAsBRep[currBRepIndex].Value;
exportAsBRep.Add(new KeyValuePair<int, SimpleSweptSolidAnalyzer>(fixIndex, fixAnalyzer));
}
numBRepsToExport = exportAsBRep.Count;
}
}
}
currentFaceHashSetList.Add(new HashSet<IFCAnyHandle>(currentFaceSet));
}
}
}
if (hasTriangulatedGeometry)
{
HashSet<IFCAnyHandle> bodyItemSet = new HashSet<IFCAnyHandle>();
bodyItemSet.UnionWith(bodyItems);
if (bodyItemSet.Count > 0)
{
bodyData.RepresentationHnd = RepresentationUtil.CreateTessellatedRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, null);
bodyData.ShapeRepresentationType = ShapeRepresentationType.Tessellation;
}
}
else if (hasAdvancedBrepGeometry)
{
HashSet<IFCAnyHandle> bodyItemSet = new HashSet<IFCAnyHandle>();
bodyItemSet.UnionWith(bodyItems);
if (bodyItemSet.Count > 0)
{
bodyData.RepresentationHnd = RepresentationUtil.CreateAdvancedBRepRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, null);
bodyData.ShapeRepresentationType = ShapeRepresentationType.AdvancedBrep;
}
}
else
{
startIndexForObject.Add(currentFaceHashSetList.Count); // end index for last object.
IList<IFCAnyHandle> repMapItems = new List<IFCAnyHandle>();
int size = currentFaceHashSetList.Count;
if (exportAsBReps)
{
int matToUse = -1;
for (int ii = 0; ii < size; ii++)
{
if (startIndexForObject[matToUse + 1] == ii)
matToUse++;
HashSet<IFCAnyHandle> currentFaceHashSet = currentFaceHashSetList[ii];
ElementId currMatId = materialIds[matToUse];
IFCAnyHandle faceOuter = IFCInstanceExporter.CreateClosedShell(file, currentFaceHashSet);
IFCAnyHandle brepHnd = RepresentationUtil.CreateFacetedBRep(exporterIFC, document, faceOuter, currMatId);
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(brepHnd))
{
if (useMappedGeometriesIfPossible)
{
IFCAnyHandle currMappedRepHnd = CreateBRepRepresentationMap(exporterIFC, file, element, categoryId, contextOfItems, brepHnd);
repMapItems.Add(currMappedRepHnd);
IFCAnyHandle mappedItemHnd = ExporterUtil.CreateDefaultMappedItem(file, currMappedRepHnd);
bodyItems.Add(mappedItemHnd);
}
else
bodyItems.Add(brepHnd);
}
}
}
else
{
IDictionary<ElementId, HashSet<IFCAnyHandle>> faceSets = new Dictionary<ElementId, HashSet<IFCAnyHandle>>();
int matToUse = -1;
for (int ii = 0; ii < size; ii++)
{
HashSet<IFCAnyHandle> currentFaceHashSet = currentFaceHashSetList[ii];
if (startIndexForObject[matToUse + 1] == ii)
matToUse++;
IFCAnyHandle faceSetHnd = IFCInstanceExporter.CreateConnectedFaceSet(file, currentFaceHashSet);
if (useMappedGeometriesIfPossible)
{
IFCAnyHandle currMappedRepHnd = CreateSurfaceRepresentationMap(exporterIFC, file, element, categoryId, contextOfItems, faceSetHnd);
repMapItems.Add(currMappedRepHnd);
IFCAnyHandle mappedItemHnd = ExporterUtil.CreateDefaultMappedItem(file, currMappedRepHnd);
bodyItems.Add(mappedItemHnd);
}
else
{
HashSet<IFCAnyHandle> surfaceSet = null;
if (faceSets.TryGetValue(materialIds[matToUse], out surfaceSet))
{
surfaceSet.Add(faceSetHnd);
}
else
{
surfaceSet = new HashSet<IFCAnyHandle>();
surfaceSet.Add(faceSetHnd);
faceSets[materialIds[matToUse]] = surfaceSet;
}
}
}
if (faceSets.Count > 0)
{
foreach (KeyValuePair<ElementId, HashSet<IFCAnyHandle>> faceSet in faceSets)
{
IFCAnyHandle surfaceModel = IFCInstanceExporter.CreateFaceBasedSurfaceModel(file, faceSet.Value);
BodyExporter.CreateSurfaceStyleForRepItem(exporterIFC, document, surfaceModel, faceSet.Key);
bodyItems.Add(surfaceModel);
}
}
}
if (bodyItems.Count == 0)
return bodyData;
// Add in mapped items.
if (useMappedGeometriesIfPossible && (solidMappings != null))
{
foreach (KeyValuePair<int, Transform> mappedItem in solidMappings)
{
for (int idx = startIndexForObject[mappedItem.Key]; idx < startIndexForObject[mappedItem.Key + 1]; idx++)
{
IFCAnyHandle mappedItemHnd = ExporterUtil.CreateMappedItemFromTransform(file, repMapItems[idx], mappedItem.Value);
bodyItems.Add(mappedItemHnd);
}
}
}
HashSet<IFCAnyHandle> bodyItemSet = new HashSet<IFCAnyHandle>();
bodyItemSet.UnionWith(bodyItems);
if (useMappedGeometriesIfPossible)
{
bodyData.RepresentationHnd = RepresentationUtil.CreateBodyMappedItemRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet);
}
else if (exportAsBReps)
{
if (numExtrusions > 0)
bodyData.RepresentationHnd = RepresentationUtil.CreateSolidModelRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet);
else
bodyData.RepresentationHnd = RepresentationUtil.CreateBRepRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet);
}
else
bodyData.RepresentationHnd = RepresentationUtil.CreateSurfaceRep(exporterIFC, element, categoryId, contextOfItems, bodyItemSet, false, null);
if (useGroupsIfPossible && (groupKey != null) && (groupData != null))
{
groupData.Handles = repMapItems;
ExporterCacheManager.GroupElementGeometryCache.Register(groupKey, groupData);
}
bodyData.ShapeRepresentationType = ShapeRepresentationType.Brep;
}
return bodyData;
}
