public void FindAdjacentFaces()
{
var box = Box.Create(10.0, 10.0, 1.0);
var edge = box.GetBRep().Edges()[1];
var faces = box.GetBRep().Faces();
var(face1, face2) = EdgeAlgo.FindAdjacentFaces(box.GetBRep(), edge);
Assert.NotNull(face1);
Assert.NotNull(face2);
Assert.AreEqual(faces[0], face1);
Assert.AreEqual(faces[5], face2);
}
//--------------------------------------------------------------------------------------------------
void _AddEdgeProperties(TopoDS_Edge edge)
{
const string edgecat = "Edge";
const string curvecat = "Curve";
if (Shape != null)
{
var subshapeRef = Shape.GetSubshapeReference(_TopLevelShape, edge);
_AddProperty(edgecat, "SubshapeRef", subshapeRef?.ToString() ?? "null");
}
var flags = "";
if (BRep_Tool.Degenerated(edge))
{
flags += "Degenerated ";
}
if (BRep_Tool.SameParameter(edge))
{
flags += "SameParameter ";
}
if (BRep_Tool.SameRange(edge))
{
flags += "SameRange ";
}
_AddProperty(edgecat, "Is Closed", $"{(BRep_Tool.IsClosed(edge) ? "Yes" : "No")}");
_AddProperty(edgecat, "Curve Type", $"{(BRep_Tool.IsGeometric(edge) ? "Geometric Curve" : "Curve on Surface")}");
var props = new GProp_GProps();
BRepGProp.LinearProperties(BrepShape, props);
_AddProperty(edgecat, "Length", $"{props.Mass()}");
_AddProperty(edgecat, "Tolerance", $"{BRep_Tool.Tolerance(edge)}");
if (!flags.IsEmpty())
{
_AddProperty(edgecat, "Flags", flags);
}
if (BRep_Tool.IsGeometric(edge))
{
// 3D curve
double first = 0, last = 0;
var curve = BRep_Tool.Curve(edge, ref first, ref last);
if (curve != null)
{
_AddProperty(edgecat, "Parameter", $"({first}, {last})");
_AddProperty(curvecat, "Class", curve.GetType().Name.Replace("Geom_", ""));
_AddProperty(curvecat, "Is Closed", $"{(curve.IsClosed() ? "Yes" : "No")}");
if (curve.IsPeriodic())
{
_AddProperty(curvecat, "Period", $"{curve.Period()}");
}
_AddProperty(curvecat, "Continuity", curve.Continuity().ToString().Replace("GeomAbs_", ""));
switch (curve)
{
case Geom_Line line:
const string linecat = "Line";
var lineLoc = line.Position().Location;
_AddProperty(linecat, "Location", $"({lineLoc.X.ToRoundedString()}, {lineLoc.Y.ToRoundedString()}, {lineLoc.Z.ToRoundedString()})");
var lineDir = line.Position().Direction;
_AddProperty(linecat, "Direction", $"({lineDir.X.ToRoundedString()}, {lineDir.Y.ToRoundedString()}, {lineDir.Z.ToRoundedString()})");
break;
case Geom_Circle circle:
const string circlecat = "Circle";
_AddProperty(circlecat, "Radius", $"{circle.Radius().ToRoundedString()}");
var circleLoc = circle.Position().Location;
_AddProperty(circlecat, "Location", $"({circleLoc.X.ToRoundedString()}, {circleLoc.Y.ToRoundedString()}, {circleLoc.Z.ToRoundedString()})");
var circleDir = circle.Position().Direction;
_AddProperty(circlecat, "Direction", $"({circleDir.X.ToRoundedString()}, {circleDir.Y.ToRoundedString()}, {circleDir.Z.ToRoundedString()})");
var circleXDir = circle.Position().XDirection;
_AddProperty(circlecat, "X-Direction", $"({circleXDir.X.ToRoundedString()}, {circleXDir.Y.ToRoundedString()}, {circleXDir.Z.ToRoundedString()})");
var circleYDir = circle.Position().YDirection;
_AddProperty(circlecat, "Y-Direction", $"({circleYDir.X.ToRoundedString()}, {circleYDir.Y.ToRoundedString()}, {circleYDir.Z.ToRoundedString()})");
break;
case Geom_Ellipse ellipse:
const string ellipsecat = "Ellipse";
_AddProperty(ellipsecat, "Major Radius", $"{ellipse.MajorRadius().ToRoundedString()}");
_AddProperty(ellipsecat, "Minor Radius", $"{ellipse.MinorRadius().ToRoundedString()}");
_AddProperty(ellipsecat, "Eccentricity", $"{ellipse.Eccentricity().ToRoundedString()}");
_AddProperty(ellipsecat, "Focal", $"{ellipse.Focal().ToRoundedString()}");
var ellipseFocus = ellipse.Focus1();
_AddProperty(ellipsecat, "Focus 1", $"({ellipseFocus.X.ToRoundedString()}, {ellipseFocus.Y.ToRoundedString()}, {ellipseFocus.Z.ToRoundedString()})");
ellipseFocus = ellipse.Focus2();
_AddProperty(ellipsecat, "Focus 2", $"({ellipseFocus.X.ToRoundedString()}, {ellipseFocus.Y.ToRoundedString()}, {ellipseFocus.Z.ToRoundedString()})");
var ellipseLoc = ellipse.Position().Location;
_AddProperty(ellipsecat, "Location", $"({ellipseLoc.X.ToRoundedString()}, {ellipseLoc.Y.ToRoundedString()}, {ellipseLoc.Z.ToRoundedString()})");
var ellipseDir = ellipse.Position().Direction;
_AddProperty(ellipsecat, "Direction", $"({ellipseDir.X.ToRoundedString()}, {ellipseDir.Y.ToRoundedString()}, {ellipseDir.Z.ToRoundedString()})");
var ellipseXDir = ellipse.Position().XDirection;
_AddProperty(ellipsecat, "X-Direction", $"({ellipseXDir.X.ToRoundedString()}, {ellipseXDir.Y.ToRoundedString()}, {ellipseXDir.Z.ToRoundedString()})");
var ellipseYDir = ellipse.Position().YDirection;
_AddProperty(ellipsecat, "Y-Direction", $"({ellipseYDir.X.ToRoundedString()}, {ellipseYDir.Y.ToRoundedString()}, {ellipseYDir.Z.ToRoundedString()})");
break;
case Geom_BezierCurve bezier:
const string beziercat = "Bézier Curve";
_AddProperty(beziercat, "Degree", $"{bezier.Degree()}");
_AddProperty(beziercat, "Pole Count", $"{bezier.NbPoles()}");
_AddProperty(beziercat, "Is Rational", $"{(bezier.IsRational() ? "Yes" : "No")}");
break;
case Geom_BSplineCurve bspline:
const string bsplinecat = "B-Spline Curve";
_AddProperty(bsplinecat, "Degree", $"{bspline.Degree()}");
_AddProperty(bsplinecat, "Pole Count", $"{bspline.NbPoles()}");
_AddProperty(bsplinecat, "Knoe Count", $"{bspline.NbKnots()}");
_AddProperty(bsplinecat, "Knot Distrib.", bspline.KnotDistribution().ToString().Replace("GeomAbs_", ""));
_AddProperty(bsplinecat, "Is Rational", $"{(bspline.IsRational() ? "Yes" : "No")}");
break;
}
}
}
else
{
// Curve on surface, currently not supported
}
// Get continuity information
var(face1, face2) = EdgeAlgo.FindAdjacentFaces(_TopLevelShape, edge);
if (face1 != null && face2 != null)
{
_AddProperty(edgecat, "Face Contin.", BRep_Tool.Continuity(edge, face1, face2).ToString().Replace("GeomAbs_", ""));
}
}
//--------------------------------------------------------------------------------------------------
/*
* Determine if a face belongs to a bend section. To recognise a bend section, it must have the
* following structure:
* - Four faces, two of them planar (side faces) and two of them cylinder (top/bottom)
* - All edges connecting these four faces must be circular
* - All circles must have coaxial axes with only two different positions
* - All circles must have one of two radii
*
* If a side face is detected, the iteration of faces should stop, but no section is built.
* If a top/bottom face is detected, the whole section is recovered and all parameters are
* determined. The faces are found by searching for faces which share the circular edges.
*
* This function is called recursively if one of the out-faces is also recognized
* as part of a connected bend section.
*/
bool _AnalyzeBendSection(MakeContext context, TopoDS_Face baseFace, TopoDS_Edge sharedEdge, out Section section)
{
section = null;
var bendParams = new BendParameter();
bendParams.Faces[0] = baseFace;
if (!_IsFaceOfBendSection(baseFace, bendParams))
{
return(false);
}
var faceAdaptor = new BRepAdaptor_Surface(baseFace);
// Surface is flat, but two edges are of circle and coplanar
if (faceAdaptor.GetGeomType() == GeomAbs_SurfaceType.GeomAbs_Plane)
{
// Ignore them for the moment, but sign them as bend section face
return(true);
}
if (faceAdaptor.GetGeomType() != GeomAbs_SurfaceType.GeomAbs_Cylinder)
{
// Surface must be of type Cylinder, other are not supported currently
return(false);
}
// Find side faces
var facesForEdge0 = EdgeAlgo.FindAdjacentFaces(context.SourceShape, bendParams.Edges[0]);
bendParams.Faces[1] = facesForEdge0.face1.IsSame(baseFace) ? facesForEdge0.face2 : facesForEdge0.face1;
if (!_IsFaceOfBendSection(bendParams.Faces[1], bendParams))
{
return(false);
}
var facesForEdge1 = EdgeAlgo.FindAdjacentFaces(context.SourceShape, bendParams.Edges[1]);
bendParams.Faces[2] = facesForEdge1.face1.IsSame(baseFace) ? facesForEdge1.face2 : facesForEdge1.face1;
if (!_IsFaceOfBendSection(bendParams.Faces[2], bendParams))
{
return(false);
}
// Find fourth face
var facesForEdge2 = EdgeAlgo.FindAdjacentFaces(context.SourceShape, bendParams.Edges[2]);
var facesForEdge3 = EdgeAlgo.FindAdjacentFaces(context.SourceShape, bendParams.Edges[3]);
if (facesForEdge2.face1.IsSame(facesForEdge3.face1) ||
facesForEdge2.face1.IsSame(facesForEdge3.face2))
{
bendParams.Faces[3] = facesForEdge2.face1;
}
else if (facesForEdge2.face2.IsSame(facesForEdge3.face1) ||
facesForEdge2.face2.IsSame(facesForEdge3.face2))
{
bendParams.Faces[3] = facesForEdge2.face2;
}
else
{
return(false); // fourth face not found
}
if (!_IsFaceOfBendSection(bendParams.Faces[3], bendParams))
{
return(false);
}
// Create Section
section = new Section();
section.Faces.AddRange(bendParams.Faces.Where(face => face != null));
section.BendParameter = bendParams;
// Find connected faces
_FindFacesConnectedToBendSection(context, sharedEdge, bendParams);
// Check if the connected section is also an bend section
if (bendParams.ConnectedOutFaces[0] != null &&
_AnalyzeBendSection(context, bendParams.ConnectedOutFaces[0], bendParams.ConnectedOutSharedEdges[0], out var connectedBendSection))
{
if (connectedBendSection == null)
{
Messages.Error("A bend section is connected to another bend section with an perpendicular direction.",
"To fix this, you need to add a small flange between these two bend sections.");
}
section.Children.Add(connectedBendSection);
}
else
{
section.Children.Add(new Section()); // Bend sections have exactly one connected section
}
return(true);
}
//--------------------------------------------------------------------------------------------------
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);
}