//--------------------------------------------------------------------------------------------------
public static void UpdateSolidOrientation(TopoDS_Shape solid)
{
var classifier = new BRepClass3d_SolidClassifier(solid);
classifier.PerformInfinitePoint(Precision.Confusion());
if (classifier.State() == TopAbs_State.TopAbs_IN)
{
solid.Reverse();
}
}
//--------------------------------------------------------------------------------------------------
public static TopoDS_Solid MakeSolid(TopoDS_Shell shell, bool correctOrientation)
{
var builder = new BRep_Builder();
var solid = new TopoDS_Solid();
builder.MakeSolid(solid);
builder.Add(solid, shell);
if (correctOrientation)
{
var classifier = new BRepClass3d_SolidClassifier(solid);
classifier.PerformInfinitePoint(Precision.Confusion());
if (classifier.State() == TopAbs_State.TopAbs_IN)
{
solid = new TopoDS_Solid();
builder.MakeSolid(solid);
builder.Add(solid, shell.Reversed());
}
}
return(solid);
}
//--------------------------------------------------------------------------------------------------
bool _DoOffset(MakeContext context)
{
if (_Offset <= 0)
{
return(false);
}
// Move neutral plane
var newPlane = context.NeutralPlane.Translated(context.Direction.ToVec().Multiplied(_Offset));
// Create section edge
var faceOfPlane = new BRepBuilderAPI_MakeFace(new Geom_Plane(newPlane), Precision.Confusion()).Shape();
var section = new BRepAlgoAPI_Section(context.Face, faceOfPlane);
section.Build();
if (!section.IsDone())
{
Messages.Warning("The offset can not be performed, section operation failed.");
return(false);
}
var newEdge = section.Shape().Edges().FirstOrDefault();
if (!section.IsDone() || newEdge == null)
{
Messages.Warning("The offset value seems to be out of range.");
return(false);
}
if (context.ReversedFaceSense)
{
newEdge.Orientation(TopAbs_Orientation.TopAbs_REVERSED);
}
// Split face with section edge
var splitShape = new BRepFeat_SplitShape(context.Source);
splitShape.Add(newEdge, context.Face);
splitShape.Build();
if (!splitShape.IsDone())
{
Messages.Warning("The offset can not be performed, the face split operation failed.");
return(false);
}
var newShape = splitShape.Shape();
var newFace = splitShape.DirectLeft().First().ToFace();
// Reduce continuity of new edge to C0 to allow the draft algo to make a sharp corner
var(face1, face2) = EdgeAlgo.FindAdjacentFaces(newShape, newEdge);
if (face1 == null || face2 == null)
{
Messages.Warning("The offset can not be performed, invalid face count after split operation.");
return(false);
}
var builder = new BRep_Builder();
builder.Continuity(newEdge, face1, face2, GeomAbs_Shape.GeomAbs_C0);
// Set results
context.NeutralPlane = newPlane;
context.Source = newShape;
context.Face = newFace;
UpdateModifiedSubshapes(context.Source, splitShape);
return(true);
}