Esempio n. 1
0
        /// <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)
        {
            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))
            {
                if (productWrapper != null)
                {
                    productWrapper.ClearFinishMaterials();
                }

                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;
                    }
                }

                ElementId    typeElemId       = hostObject.GetTypeId();
                IFCAnyHandle materialLayerSet = ExporterCacheManager.MaterialLayerSetCache.Find(typeElemId);
                // Roofs with no components are only allowed one material.  We will arbitrarily choose the thickest material.
                IFCAnyHandle primaryMaterialHnd = ExporterCacheManager.MaterialLayerSetCache.FindPrimaryMaterialHnd(typeElemId);
                if (IFCAnyHandleUtil.IsNullOrHasNoValue(materialLayerSet))
                {
                    HostObjAttributes hostObjAttr = hostObject.Document.GetElement(typeElemId) as HostObjAttributes;
                    if (hostObjAttr == null)
                    {
                        return(true); //nothing to do
                    }
                    List <ElementId> matIds = new List <ElementId>();
                    List <double>    widths = new List <double>();
                    List <MaterialFunctionAssignment> functions = new List <MaterialFunctionAssignment>();
                    ElementId         baseMatId = CategoryUtil.GetBaseMaterialIdForElement(hostObject);
                    CompoundStructure cs        = hostObjAttr.GetCompoundStructure();
                    if (cs != null)
                    {
                        //TODO: Vertically compound structures are not yet supported by export.
                        if (!cs.IsVerticallyHomogeneous() && !MathUtil.IsAlmostZero(wallHeight))
                        {
                            cs = cs.GetSimpleCompoundStructure(wallHeight, wallHeight / 2.0);
                        }

                        for (int i = 0; i < cs.LayerCount; ++i)
                        {
                            ElementId matId = cs.GetMaterialId(i);
                            if (matId != ElementId.InvalidElementId)
                            {
                                matIds.Add(matId);
                            }
                            else
                            {
                                matIds.Add(baseMatId);
                            }
                            widths.Add(cs.GetLayerWidth(i));
                            // save layer function into ProductWrapper,
                            // it's used while exporting "Function" of Pset_CoveringCommon
                            functions.Add(cs.GetLayerFunction(i));
                        }
                    }

                    if (matIds.Count == 0)
                    {
                        matIds.Add(baseMatId);
                        widths.Add(cs != null ? cs.GetWidth() : 0);
                        functions.Add(MaterialFunctionAssignment.None);
                    }

                    // We can't create IfcMaterialLayers without creating an IfcMaterialLayerSet.  So we will simply collate here.
                    IList <IFCAnyHandle> materialHnds = new List <IFCAnyHandle>();
                    IList <int>          widthIndices = new List <int>();
                    double thickestLayer = 0.0;
                    for (int ii = 0; ii < matIds.Count; ++ii)
                    {
                        // Require positive width for IFC2x3 and before, and non-negative width for IFC4.
                        if (widths[ii] < -MathUtil.Eps())
                        {
                            continue;
                        }

                        bool almostZeroWidth = MathUtil.IsAlmostZero(widths[ii]);
                        if (ExporterCacheManager.ExportOptionsCache.FileVersion != IFCVersion.IFC4 && almostZeroWidth)
                        {
                            continue;
                        }

                        if (almostZeroWidth)
                        {
                            widths[ii] = 0.0;
                        }

                        IFCAnyHandle materialHnd = CategoryUtil.GetOrCreateMaterialHandle(exporterIFC, matIds[ii]);
                        if (primaryMaterialHnd == null || (widths[ii] > thickestLayer))
                        {
                            primaryMaterialHnd = materialHnd;
                            thickestLayer      = widths[ii];
                        }

                        widthIndices.Add(ii);
                        materialHnds.Add(materialHnd);

                        if ((productWrapper != null) && (functions[ii] == MaterialFunctionAssignment.Finish1 || functions[ii] == MaterialFunctionAssignment.Finish2))
                        {
                            productWrapper.AddFinishMaterial(materialHnd);
                        }
                    }

                    int numLayersToCreate = widthIndices.Count;
                    if (numLayersToCreate == 0)
                    {
                        return(false);
                    }

                    if (!containsBRepGeometry)
                    {
                        IList <IFCAnyHandle> layers = new List <IFCAnyHandle>(numLayersToCreate);

                        for (int ii = 0; ii < numLayersToCreate; ii++)
                        {
                            int          widthIndex    = widthIndices[ii];
                            double       scaledWidth   = UnitUtil.ScaleLength(widths[widthIndex]);
                            IFCAnyHandle materialLayer = IFCInstanceExporter.CreateMaterialLayer(file, materialHnds[ii], scaledWidth, null);
                            layers.Add(materialLayer);
                        }

                        string layerSetName = exporterIFC.GetFamilyName();
                        materialLayerSet = IFCInstanceExporter.CreateMaterialLayerSet(file, layers, layerSetName);

                        ExporterCacheManager.MaterialLayerSetCache.Register(typeElemId, materialLayerSet);
                        ExporterCacheManager.MaterialLayerSetCache.RegisterPrimaryMaterialHnd(typeElemId, primaryMaterialHnd);
                    }
                    else
                    {
                        foreach (IFCAnyHandle elemHnd in elemHnds)
                        {
                            CategoryUtil.CreateMaterialAssociations(exporterIFC, elemHnd, matIds);
                        }
                    }
                }

                // 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);
                    if (containsBRepGeometry)
                    {
                        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);
                    if (!hasSubElems && !isRoof && !IFCAnyHandleUtil.IsTypeOf(elemHnd, IFCEntityType.IfcWall))
                    {
                        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;
                                    Plane defPlane     = new Plane(XYZ.BasisX, XYZ.BasisY, XYZ.Zero);
                                    bool  curveFlipped = GeometryUtil.MustFlipCurve(defPlane, curve);
                                    flipDirSense = !(wall.Flipped ^ curveFlipped);
                                }
                            }
                            else if (hostObject is Floor)
                            {
                                flipDirSense = false;
                            }

                            double            offsetFromReferenceLine = flipDirSense ? -scaledOffset : scaledOffset;
                            IFCDirectionSense sense = flipDirSense ? IFCDirectionSense.Negative : IFCDirectionSense.Positive;

                            layerSetUsage = IFCInstanceExporter.CreateMaterialLayerSetUsage(file, materialLayerSet, direction, sense, offsetFromReferenceLine);
                        }
                        ExporterCacheManager.MaterialLayerRelationsCache.Add(layerSetUsage, elemHnd);
                    }
                    else
                    {
                        if (hasSubElems)
                        {
                            foreach (IFCAnyHandle subElemHnd in subElemHnds)
                            {
                                if (!IFCAnyHandleUtil.IsNullOrHasNoValue(subElemHnd))
                                {
                                    ExporterCacheManager.MaterialLayerRelationsCache.Add(materialLayerSet, subElemHnd);
                                }
                            }
                        }
                        else if (!isRoof)
                        {
                            ExporterCacheManager.MaterialLayerRelationsCache.Add(materialLayerSet, elemHnd);
                        }
                        else if (primaryMaterialHnd != null)
                        {
                            ExporterCacheManager.MaterialLayerRelationsCache.Add(primaryMaterialHnd, elemHnd);
                        }
                    }
                }

                tr.Commit();
                return(true);
            }
        }