/// <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)
{
// since IFCAdvancedBrep must contain a closed shell, we set the BuildPreferenceType to be solid for now
for (int pass = 0; pass < 2; pass++)
{
using (BuilderScope bs = shapeEditScope.InitializeBuilder(IFCShapeBuilderType.BrepBuilder))
{
BrepBuilderScope brepBuilderScope = bs as BrepBuilderScope;
BRepType brepType = (pass == 0) ? BRepType.Solid : BRepType.OpenShell;
brepBuilderScope.StartCollectingFaceSet(brepType);
Outer.AllowInvalidFace = (pass == 0);
Outer.CreateShape(shapeEditScope, lcs, scaledLcs, guid);
IList <GeometryObject> geomObjs = null;
geomObjs = brepBuilderScope.CreateGeometry();
// We'll return only if we have geometry; otherwise we'll try again with looser validation, if we can.
if (geomObjs != null)
{
if (pass == 1)
{
Importer.TheLog.LogError(Id, "Some faces are missing from this Solid; reading in as an Open Shell instead.", false);
}
return(geomObjs);
}
}
}
return(null);
}
/// <summary>
/// Identifies if the solid is watertight. Is watertight if all edges are shared by two faces.
/// </summary>
/// <param name="solid"></param>
/// <param name="brepType"></param>
/// <returns>It true, the solid is watertight and defines a closed volume.</returns>
public static bool IsWatertight(this Solid solid, out BRepType brepType)
{
brepType = BRepType.OpenShell;
var volume = solid.Volume;
var watertight = IsWatertight(solid);
if (watertight || System.Math.Abs(volume) > 1e-9)
{
brepType = volume < 0.0 ? BRepType.Void : BRepType.Solid;
}
return(watertight);
}
private static GeometryObject ToRevitType(Autodesk.DesignScript.Geometry.Topology topology,
bool performHostUnitConversion,
BRepType type, ElementId materialId)
{
var faces = topology.Faces.ToList();
var brb = new BRepBuilder(type);
var edge2EdgeId = new Dictionary <Edge, BRepBuilderGeometryId>();
//foreach face in solid/surface
foreach (Face protoFace in faces)
{
using (var geom = protoFace.SurfaceGeometry())
{
using (var ngeom = geom.ToNurbsSurface())
{
bool flipped = false;
// Check if the nurbs surface has flipped compared to the original surface
if (geom.NormalAtParameter(.5, .5).Dot(ngeom.NormalAtParameter(.5, .5)) < 0)
{
flipped = true;
}
// Create Revit nurbs surface
var bbface = BRepBuilderSurfaceGeometry.CreateNURBSSurface(ngeom.DegreeU, ngeom.DegreeV,
ngeom.UKnots(), ngeom.VKnots(), ngeom.ControlPoints().SelectMany(x => x.Select(y => y.ToXyz(performHostUnitConversion))).ToList(),
ngeom.Weights().SelectMany(x => x).ToList(),
false,
null);
// Add face
var faceId = brb.AddFace(bbface, flipped);
// Set material
if (materialId != null)
{
brb.SetFaceMaterialId(faceId, materialId);
}
// add loops and connected edges
foreach (var loop in protoFace.Loops)
{
var loopId = brb.AddLoop(faceId);
foreach (var coedge in loop.CoEdges)
{
var edge = coedge.Edge;
BRepBuilderGeometryId edgeId;
if (edge2EdgeId.ContainsKey(edge))
{
edgeId = edge2EdgeId[edge];
}
else
{
var curve = edge.CurveGeometry;
// Revit is already projecting edges onto the surface after checking for loop consistency
// and is quite forgiving even when we use the nurbs surface instead of
// the original surface.
//
// But there are cases when edges ends up slightly outside one of the surfaces and Revit fails.
//
// This is something that we can be improve going forward.
edgeId = brb.AddEdge(BRepBuilderEdgeGeometry.Create(curve.ToRevitType(performHostUnitConversion)));
edge2EdgeId[edge] = edgeId;
}
brb.AddCoEdge(loopId, edgeId, coedge.Reversed);
}
brb.FinishLoop(loopId);
}
brb.FinishFace(faceId);
}
}
}
//clean up everything
edge2EdgeId.ToList().ForEach(x => x.Key.Dispose());
faces.ForEach(x => x.Dispose());
// Get result
var outcome = brb.Finish();
var converted = brb.GetResult();
return(converted);
}
/// <summary>
/// Start collecting faces to create a BRep solid.
/// </summary>
/// <param name="brepType">The expected type of the geometry being built.</param>
public void StartCollectingFaceSet(BRepType brepType)
{
BrepBuilder = new BRepBuilder(brepType);
BrepBuilder.SetAllowShortEdges();
}
/// <summary>
/// Start collecting faces to create a BRep solid.
/// </summary>
/// <param name="brepType">The expected type of the geometry being built.</param>
public void StartCollectingFaceSet(BRepType brepType)
{
BrepBuilder = new BRepBuilder(brepType);
}