/// <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, without scale.</param>
/// <param name="scaledLcs">Local coordinate system for the geometry, including scale, potentially non-uniform.</param>
/// <param name="guid">The guid of an element for which represntation is being created.</param>
/// <returns>The created geometry.</returns>
protected override IList<GeometryObject> CreateGeometryInternal(
IFCImportShapeEditScope shapeEditScope, Transform lcs, Transform scaledLcs, string guid)
{
if (Outer == null || Outer.Faces.Count == 0)
return null;
IList<GeometryObject> geomObjs = null;
bool canRevertToMesh = false;
using (BuilderScope bs = shapeEditScope.InitializeBuilder(IFCShapeBuilderType.TessellatedShapeBuilder))
{
TessellatedShapeBuilderScope tsBuilderScope = bs as TessellatedShapeBuilderScope;
tsBuilderScope.StartCollectingFaceSet();
Outer.CreateShape(shapeEditScope, lcs, scaledLcs, guid);
if (tsBuilderScope.CreatedFacesCount == Outer.Faces.Count)
{
geomObjs = tsBuilderScope.CreateGeometry(guid);
}
canRevertToMesh = tsBuilderScope.CanRevertToMesh();
}
if (geomObjs == null || geomObjs.Count == 0)
{
if (canRevertToMesh)
{
using (IFCImportShapeEditScope.BuildPreferenceSetter setter =
new IFCImportShapeEditScope.BuildPreferenceSetter(shapeEditScope, IFCImportShapeEditScope.BuildPreferenceType.AnyMesh))
{
using (BuilderScope newBuilderScope = shapeEditScope.InitializeBuilder(IFCShapeBuilderType.TessellatedShapeBuilder))
{
TessellatedShapeBuilderScope newTsBuilderScope = newBuilderScope as TessellatedShapeBuilderScope;
// Let's see if we can loosen the requirements a bit, and try again.
newTsBuilderScope.StartCollectingFaceSet();
Outer.CreateShape(shapeEditScope, lcs, scaledLcs, guid);
// This needs to be in scope so that we keep the mesh tolerance for vertices.
if (newTsBuilderScope.CreatedFacesCount != 0)
{
if (newTsBuilderScope.CreatedFacesCount != Outer.Faces.Count)
Importer.TheLog.LogWarning
(Outer.Id, "Processing " + newTsBuilderScope.CreatedFacesCount + " valid faces out of " + Outer.Faces.Count + " total.", false);
geomObjs = newTsBuilderScope.CreateGeometry(guid);
}
}
}
}
}
if (geomObjs == null || geomObjs.Count == 0)
{
// Couldn't use fallback, or fallback didn't work.
Importer.TheLog.LogWarning(Id, "Couldn't create any geometry.", false);
return null;
}
return geomObjs;
}
/// <summary>
/// Return geometry for a particular representation item.
/// </summary>
/// <param name="shapeEditScope">The geometry creation scope.</param>
/// <param name="lcs">Local coordinate system for the geometry, without scale.</param>
/// <param name="scaledLcs">Local coordinate system for the geometry, including scale, potentially non-uniform.</param>
/// <param name="guid">The guid of an element for which represntation is being created.</param>
/// <returns>The created geometry.</returns>
public IList<GeometryObject> CreateGeometry(
IFCImportShapeEditScope shapeEditScope, Transform lcs, Transform scaledLcs, string guid)
{
IList<GeometryObject> firstSolids = FirstOperand.CreateGeometry(shapeEditScope, lcs, scaledLcs, guid);
if (firstSolids != null)
{
foreach (GeometryObject potentialSolid in firstSolids)
{
if (!(potentialSolid is Solid))
{
Importer.TheLog.LogError((FirstOperand as IFCRepresentationItem).Id, "Can't perform Boolean operation on a Mesh.", false);
return firstSolids;
}
}
}
IList<GeometryObject> secondSolids = null;
if (SecondOperand != null)
{
try
{
using (IFCImportShapeEditScope.BuildPreferenceSetter setter =
new IFCImportShapeEditScope.BuildPreferenceSetter(shapeEditScope, IFCImportShapeEditScope.BuildPreferenceType.ForceSolid))
{
// Before we process the second operand, we are going to see if there is a uniform material set for the first operand
// (corresponding to the solid in the Boolean operation). We will try to suggest the same material for the voids to avoid arbitrary
// setting of material information for the cut faces.
IFCStyledItem firstOperandStyledItem = GetStyledItemFromOperand(FirstOperand as IFCRepresentationItem);
using (IFCImportShapeEditScope.IFCMaterialStack stack =
new IFCImportShapeEditScope.IFCMaterialStack(shapeEditScope, firstOperandStyledItem, null))
{
secondSolids = SecondOperand.CreateGeometry(shapeEditScope, lcs, scaledLcs, guid);
}
}
}
catch (Exception ex)
{
// We will allow something to be imported, in the case where the second operand is invalid.
// If the first (base) operand is invalid, we will still fail the import of this solid.
if (SecondOperand is IFCRepresentationItem)
Importer.TheLog.LogError((SecondOperand as IFCRepresentationItem).Id, ex.Message, false);
else
throw ex;
secondSolids = null;
}
}
IList<GeometryObject> resultSolids = null;
if (firstSolids == null)
{
resultSolids = secondSolids;
}
else if (secondSolids == null || BooleanOperator == null)
{
if (BooleanOperator == null)
Importer.TheLog.LogError(Id, "Invalid BooleanOperationsType.", false);
resultSolids = firstSolids;
}
else
{
BooleanOperationsType booleanOperationsType = BooleanOperationsType.Difference;
switch (BooleanOperator)
{
case IFCBooleanOperator.Difference:
booleanOperationsType = BooleanOperationsType.Difference;
break;
case IFCBooleanOperator.Intersection:
booleanOperationsType = BooleanOperationsType.Intersect;
break;
case IFCBooleanOperator.Union:
booleanOperationsType = BooleanOperationsType.Union;
break;
default:
Importer.TheLog.LogError(Id, "Invalid BooleanOperationsType.", true);
break;
}
resultSolids = new List<GeometryObject>();
foreach (GeometryObject firstSolid in firstSolids)
{
Solid resultSolid = (firstSolid as Solid);
int secondId = (SecondOperand == null) ? -1 : (SecondOperand as IFCRepresentationItem).Id;
XYZ suggestedShiftDirection = (SecondOperand == null) ? null : SecondOperand.GetSuggestedShiftDirection(lcs);
foreach (GeometryObject secondSolid in secondSolids)
{
resultSolid = IFCGeometryUtil.ExecuteSafeBooleanOperation(Id, secondId, resultSolid, secondSolid as Solid, booleanOperationsType, suggestedShiftDirection);
if (resultSolid == null)
break;
}
if (resultSolid != null)
resultSolids.Add(resultSolid);
}
}
return resultSolids;
}
/// <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, without scale.</param>
/// <param name="scaledLcs">Local coordinate system for the geometry, including scale, potentially non-uniform.</param>
/// <param name="guid">The guid of an element for which represntation is being created.</param>
/// <returns>The created geometry.</returns>
/// <remarks>As this doesn't inherit from IfcSolidModel, this is a non-virtual CreateSolid function.</remarks>
protected IList<GeometryObject> CreateGeometry(
IFCImportShapeEditScope shapeEditScope, Transform lcs, Transform scaledLcs, string guid)
{
if (Shells.Count == 0)
return null;
IList<GeometryObject> geomObjs = null;
int numExpectedFaces = 0;
foreach (IFCConnectedFaceSet faceSet in Shells)
{
numExpectedFaces += faceSet.Faces.Count;
}
// We are going to start by trying to create a Solid, even if we are passed a shell-based model, since we can frequently
// do so. However, if we have even one missing face, we'll loosen the requirements and revert to mesh only.
for (int pass = 0; pass < 2; pass++)
{
IFCImportShapeEditScope.BuildPreferenceType target =
(pass == 0) ? IFCImportShapeEditScope.BuildPreferenceType.AnyGeometry : IFCImportShapeEditScope.BuildPreferenceType.AnyMesh;
using (IFCImportShapeEditScope.BuildPreferenceSetter setter =
new IFCImportShapeEditScope.BuildPreferenceSetter(shapeEditScope, target))
{
using (BuilderScope bs = shapeEditScope.InitializeBuilder(IFCShapeBuilderType.TessellatedShapeBuilder))
{
TessellatedShapeBuilderScope tsBuilderScope = shapeEditScope.BuilderScope as TessellatedShapeBuilderScope;
tsBuilderScope.StartCollectingFaceSet();
foreach (IFCConnectedFaceSet faceSet in Shells)
{
faceSet.CreateShape(shapeEditScope, lcs, scaledLcs, guid);
}
// If we are on our first pass, try again. If we are on our second pass, warn and create the best geometry we can.
if (tsBuilderScope.CreatedFacesCount != numExpectedFaces)
{
if (pass == 0)
continue;
Importer.TheLog.LogWarning
(Id, "Processing " + tsBuilderScope.CreatedFacesCount + " valid faces out of " + numExpectedFaces + " total.", false);
}
geomObjs = tsBuilderScope.CreateGeometry(guid);
WarnOnTooFewCreatedFaces(geomObjs, numExpectedFaces);
break;
}
}
}
if (geomObjs == null || geomObjs.Count == 0)
{
if (numExpectedFaces != 0)
{
Importer.TheLog.LogError
(Id, "No valid geometry found. This may be due to slivery triangles or other similar geometric issues.", false);
return null;
}
}
return geomObjs;
}