/// <summary>
/// Exports materials for host object.
/// </summary>
/// <param name="exporterIFC">The ExporterIFC object.</param>
/// <param name="hostObject">The host object.</param>
/// <param name="elemHnds">The host IFC handles.</param>
/// <param name="geometryElement">The geometry element.</param>
/// <param name="productWrapper">The ProductWrapper.</param>
/// <param name="levelId">The level id.</param>
/// <param name="direction">The IFCLayerSetDirection.</param>
/// <param name="containsBRepGeometry">True if the geometry contains BRep geoemtry. If so, we will export an IfcMaterialList</param>
/// <returns>True if exported successfully, false otherwise.</returns>
public static bool ExportHostObjectMaterials(ExporterIFC exporterIFC, HostObject hostObject,
IList <IFCAnyHandle> elemHnds, GeometryElement geometryElement, ProductWrapper productWrapper,
ElementId levelId, Toolkit.IFCLayerSetDirection direction, bool containsBRepGeometry, IFCAnyHandle typeHnd = null)
{
if (hostObject == null)
{
return(true); //nothing to do
}
if (elemHnds == null || (elemHnds.Count == 0))
{
return(true); //nothing to do
}
IFCFile file = exporterIFC.GetFile();
using (IFCTransaction tr = new IFCTransaction(file))
{
double scaledOffset = 0.0, scaledWallWidth = 0.0, wallHeight = 0.0;
Wall wall = hostObject as Wall;
if (wall != null)
{
scaledWallWidth = UnitUtil.ScaleLength(wall.Width);
scaledOffset = -scaledWallWidth / 2.0;
BoundingBoxXYZ boundingBox = wall.get_BoundingBox(null);
if (boundingBox != null)
{
wallHeight = boundingBox.Max.Z - boundingBox.Min.Z;
}
}
MaterialLayerSetInfo mlsInfo = new MaterialLayerSetInfo(exporterIFC, hostObject, productWrapper);
IFCAnyHandle materialLayerSet = mlsInfo.MaterialLayerSetHandle;
List <ElementId> materialIds = mlsInfo.MaterialIds.Select(x => x.m_baseMatId).ToList();
// Among all the calls of this method the problem of material association absence was found only
// for CeilingAndFloor host object type (see JIRA item REVIT-164913)
if (containsBRepGeometry && (hostObject is CeilingAndFloor) &&
materialIds.Count > 0 && !ExporterCacheManager.ExportOptionsCache.ExportAs4ReferenceView)
{
foreach (IFCAnyHandle elemHnd in elemHnds)
{
CategoryUtil.CreateMaterialAssociation(exporterIFC, elemHnd, materialIds);
}
}
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(materialLayerSet))
{
// If there is an override for creating IfcMaterial instead of IfcMaterialLayer for a single material/layer, assign the material directly to type or element(s)
if (IFCAnyHandleUtil.IsTypeOf(materialLayerSet, IFCEntityType.IfcMaterial))
{
if (typeHnd != null)
{
CategoryUtil.CreateMaterialAssociation(typeHnd, materialLayerSet);
}
foreach (IFCAnyHandle elemHnd in elemHnds)
{
CategoryUtil.CreateMaterialAssociation(elemHnd, materialLayerSet);
}
}
else
{
// IfcMaterialLayerSetUsage is not supported for IfcWall, only IfcWallStandardCase.
IFCAnyHandle layerSetUsage = null;
for (int ii = 0; ii < elemHnds.Count; ii++)
{
IFCAnyHandle elemHnd = elemHnds[ii];
if (IFCAnyHandleUtil.IsNullOrHasNoValue(elemHnd))
{
continue;
}
SpaceBoundingElementUtil.RegisterSpaceBoundingElementHandle(exporterIFC, elemHnd, hostObject.Id, levelId);
// Even if it is Tessellated geometry in IFC4RV, the material layer will still be assigned
if (containsBRepGeometry && !ExporterCacheManager.ExportOptionsCache.ExportAs4ReferenceView)
{
continue;
}
HashSet <IFCAnyHandle> relDecomposesSet = IFCAnyHandleUtil.GetRelDecomposes(elemHnd);
IList <IFCAnyHandle> subElemHnds = null;
if (relDecomposesSet != null && relDecomposesSet.Count == 1)
{
IFCAnyHandle relAggregates = relDecomposesSet.First();
if (IFCAnyHandleUtil.IsTypeOf(relAggregates, IFCEntityType.IfcRelAggregates))
{
subElemHnds = IFCAnyHandleUtil.GetAggregateInstanceAttribute <List <IFCAnyHandle> >(relAggregates, "RelatedObjects");
}
}
bool hasSubElems = (subElemHnds != null && subElemHnds.Count != 0);
bool isRoof = IFCAnyHandleUtil.IsTypeOf(elemHnd, IFCEntityType.IfcRoof);
bool isDisallowedWallType = (IFCAnyHandleUtil.IsTypeOf(elemHnd, IFCEntityType.IfcWall) && !ExporterCacheManager.ExportOptionsCache.ExportAs4);
// Create IfcMaterialLayerSetUsage unless we have sub-elements, are exporting a Roof, or are exporting a pre-IFC4 IfcWall.
if (!hasSubElems && !isRoof && !isDisallowedWallType)
{
bool materialAlreadyAssoc = false;
if (typeHnd != null)
{
CategoryUtil.CreateMaterialAssociation(typeHnd, materialLayerSet);
}
if (ExporterCacheManager.ExportOptionsCache.ExportAs4ReferenceView)
{
if (!materialAlreadyAssoc)
{
CategoryUtil.CreateMaterialAssociation(elemHnd, materialLayerSet);
}
}
else
{
if (layerSetUsage == null)
{
bool flipDirSense = true;
if (wall != null)
{
// if we have flipped the center curve on export, we need to take that into account here.
// We flip the center curve on export if it is an arc and it has a negative Z direction.
LocationCurve locCurve = wall.Location as LocationCurve;
if (locCurve != null)
{
Curve curve = locCurve.Curve;
Transform lcs = Transform.Identity;
bool curveFlipped = GeometryUtil.MustFlipCurve(lcs, curve);
flipDirSense = !(wall.Flipped ^ curveFlipped);
}
}
else if (hostObject is CeilingAndFloor)
{
flipDirSense = false;
}
double offsetFromReferenceLine = flipDirSense ? -scaledOffset : scaledOffset;
IFCDirectionSense sense = flipDirSense ? IFCDirectionSense.Negative : IFCDirectionSense.Positive;
layerSetUsage = CategoryUtil.CreateMaterialLayerSetUsage(file, materialLayerSet, direction, sense, offsetFromReferenceLine);
}
ExporterCacheManager.MaterialSetUsageCache.Add(layerSetUsage, elemHnd);
}
}
else
{
if (hasSubElems)
{
foreach (IFCAnyHandle subElemHnd in subElemHnds)
{
// TODO: still need to figure out the best way to create type for the sub elements because at this time a lot of information is not available, e.g.
// the Revit Element to get the type, other information for name, GUID, etc.
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(subElemHnd))
{
CategoryUtil.CreateMaterialAssociation(subElemHnd, materialLayerSet);
}
}
}
else if (!isRoof)
{
if (typeHnd != null)
{
CategoryUtil.CreateMaterialAssociation(typeHnd, materialLayerSet);
}
else
{
CategoryUtil.CreateMaterialAssociation(elemHnd, materialLayerSet);
}
}
else if (mlsInfo.PrimaryMaterialHandle != null)
{
if (typeHnd != null)
{
CategoryUtil.CreateMaterialAssociation(typeHnd, materialLayerSet);
}
else
{
CategoryUtil.CreateMaterialAssociation(elemHnd, materialLayerSet);
}
}
}
}
}
}
tr.Commit();
return(true);
}
}
