/// <summary>
/// Return geometry for a particular representation item.
/// </summary>
/// <param name="shapeEditScope">The shape edit scope.</param>
/// <param name="lcs">Local coordinate system for the geometry.</param>
/// <param name="guid">The guid of an element for which represntation is being created.</param>
/// <returns>One or more created geometries.</returns>
/// <remarks>The scaledLcs is only partially supported in this routine; it allows scaling the depth of the extrusion,
/// which is commonly found in ACA files.</remarks>
protected override IList<GeometryObject> CreateGeometryInternal(
IFCImportShapeEditScope shapeEditScope, Transform lcs, Transform scaledLcs, string guid)
{
if (Direction == null)
{
Importer.TheLog.LogError(Id, "Error processing IfcExtrudedAreaSolid, can't create geometry.", false);
return null;
}
Transform origLCS = (lcs == null) ? Transform.Identity : lcs;
Transform origScaledLCS = (scaledLcs == null) ? Transform.Identity : scaledLcs;
Transform extrusionPosition = (Position == null) ? origLCS : origLCS.Multiply(Position);
Transform scaledExtrusionPosition = (Position == null) ? origScaledLCS : origScaledLCS.Multiply(Position);
XYZ extrusionDirection = extrusionPosition.OfVector(Direction);
ISet<IList<CurveLoop>> disjointLoops = GetTransformedCurveLoops(extrusionPosition);
if (disjointLoops == null || disjointLoops.Count() == 0)
return null;
IList<GeometryObject> extrusions = new List<GeometryObject>();
foreach (IList<CurveLoop> loops in disjointLoops)
{
SolidOptions solidOptions = new SolidOptions(GetMaterialElementId(shapeEditScope), shapeEditScope.GraphicsStyleId);
XYZ scaledDirection = scaledExtrusionPosition.OfVector(Direction);
double currDepth = Depth * scaledDirection.GetLength();
GeometryObject extrusionObject = null;
try
{
// We may try to create separate extrusions, one per layer here.
bool shouldWarn = false;
ElementId overrideMaterialId = ElementId.InvalidElementId;
IList<GeometryObject> extrusionLayers = CreateGeometryFromMaterialLayerUsage(shapeEditScope, extrusionPosition, loops,
extrusionDirection, currDepth, out overrideMaterialId, out shouldWarn);
if (extrusionLayers == null || extrusionLayers.Count == 0)
{
if (shouldWarn)
Importer.TheLog.LogWarning(Id, "Couldn't process associated IfcMaterialLayerSetUsage, using body geometry instead.", false);
if (overrideMaterialId != ElementId.InvalidElementId)
solidOptions.MaterialId = overrideMaterialId;
extrusionObject = GeometryCreationUtilities.CreateExtrusionGeometry(loops, extrusionDirection, currDepth, solidOptions);
}
else
{
foreach (GeometryObject extrusionLayer in extrusionLayers)
extrusions.Add(extrusionLayer);
}
}
catch (Exception ex)
{
if (shapeEditScope.MustCreateSolid())
throw ex;
Importer.TheLog.LogError(Id, "Extrusion has an invalid definition for a solid; reverting to mesh.", false);
MeshFromGeometryOperationResult meshResult = TessellatedShapeBuilder.CreateMeshByExtrusion(
loops, extrusionDirection, currDepth, GetMaterialElementId(shapeEditScope));
// will throw if mesh is not available
extrusionObject = meshResult.GetMesh();
}
if (extrusionObject != null)
extrusions.Add(extrusionObject);
}
return extrusions;
}