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create/src/Mod/Part/App/FeatureExtrusion.cpp
DeepSOIC 98418a4e0c Part: Extrude: improvements 
* split Dir into Dir+Length; added second Length
* support for parametric linked direction: to arbitrary edge, and to
normal
* options: reverse, symmetric
* second taper angle
* changed offset join mode for tapered extrusion on OCCT7
2016-09-01 11:46:18 +02:00

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/***************************************************************************
* Copyright (c) 2008 Werner Mayer <wmayer[at]users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
# include <cmath>
# include <Bnd_Box.hxx>
# include <BRepBndLib.hxx>
# include <gp_Pln.hxx>
# include <gp_Lin.hxx>
# include <gp_Trsf.hxx>
# include <BRep_Tool.hxx>
# include <BRepAdaptor_Surface.hxx>
# include <BRepAdaptor_Curve.hxx>
# include <BRepCheck_Analyzer.hxx>
# include <BRepOffsetAPI_MakeOffset.hxx>
# include <BRepBuilderAPI_Copy.hxx>
# include <BRepBuilderAPI_MakeFace.hxx>
# include <BRepBuilderAPI_MakeWire.hxx>
# include <BRepBuilderAPI_Transform.hxx>
# include <BRepOffsetAPI_ThruSections.hxx>
# include <BRepPrimAPI_MakePrism.hxx>
# include <Geom_Plane.hxx>
# include <IntTools_FClass2d.hxx>
# include <Precision.hxx>
# include <ShapeAnalysis.hxx>
# include <ShapeAnalysis_Surface.hxx>
# include <ShapeFix_Shape.hxx>
# include <ShapeFix_Wire.hxx>
# include <TopoDS.hxx>
# include <TopoDS_Iterator.hxx>
# include <TopExp.hxx>
# include <TopExp_Explorer.hxx>
# include <TopTools_IndexedMapOfShape.hxx>
# include <ShapeExtend_Explorer.hxx>
# include <BRepLib_FindSurface.hxx>
#endif
#include "FeatureExtrusion.h"
#include <Base/Tools.h>
#include <Base/Exception.h>
#include "Part2DObject.h"
using namespace Part;
PROPERTY_SOURCE(Part::Extrusion, Part::Feature)
const char* Extrusion::eDirModeStrings[]= {
"Custom",
"Edge",
"Normal",
NULL};
Extrusion::Extrusion()
{
ADD_PROPERTY_TYPE(Base,(0), "Extrude", App::Prop_None, "Shape to extrude");
ADD_PROPERTY_TYPE(Dir,(Base::Vector3d(0.0,0.0,1.0)), "Extrude", App::Prop_None, "Direction of extrusion (also magnitude, if both lengths are zero).");
ADD_PROPERTY_TYPE(DirMode, (dmCustom), "Extrude", App::Prop_None, "Sets, how Dir is updated.");
DirMode.setEnums(eDirModeStrings);
ADD_PROPERTY_TYPE(DirLink,(nullptr), "Extrude", App::Prop_None, "Link to edge defining extrusion direction.");
ADD_PROPERTY_TYPE(LengthFwd,(0.0), "Extrude", App::Prop_None, "Length of extrusion along direction. If both LengthFwd and LengthRev are zero, magnitude of Dir is used.");
ADD_PROPERTY_TYPE(LengthRev,(0.0), "Extrude", App::Prop_None, "Length of additional extrusion, against direction.");
ADD_PROPERTY_TYPE(Solid,(false), "Extrude", App::Prop_None, "If true, extruding a wire yeilds a solid. If false, a shell.");
ADD_PROPERTY_TYPE(Reversed,(false), "Extrude", App::Prop_None, "Set to true to swap the direction of extrusion.");
ADD_PROPERTY_TYPE(Symmetric,(false), "Extrude", App::Prop_None, "If true, extrusion is done in both directions to a total of LengthFwd. LengthRev is ignored.");
ADD_PROPERTY_TYPE(TaperAngle,(0.0), "Extrude", App::Prop_None, "Sets the angle of slope (draft) to apply to the sides. The angle is for outward taper; negative value yeilds inward tapering.");
ADD_PROPERTY_TYPE(TaperAngleRev,(0.0), "Extrude", App::Prop_None, "Taper angle of reverse part of extrusion.");
}
short Extrusion::mustExecute() const
{
if (Base.isTouched() ||
Dir.isTouched() ||
DirMode.isTouched() ||
DirLink.isTouched() ||
LengthFwd.isTouched() ||
LengthRev.isTouched() ||
Solid.isTouched() ||
Reversed.isTouched() ||
Symmetric.isTouched() ||
TaperAngle.isTouched() ||
TaperAngleRev.isTouched())
return 1;
return 0;
}
bool Extrusion::fetchAxisLink(const App::PropertyLinkSub& axisLink, Base::Vector3d& basepoint, Base::Vector3d& dir)
{
if (!axisLink.getValue())
return false;
if (!axisLink.getValue()->isDerivedFrom(Part::Feature::getClassTypeId()))
throw Base::TypeError("AxisLink has no OCC shape");
Part::Feature* linked = static_cast<Part::Feature*>(axisLink.getValue());
TopoDS_Shape axEdge;
if (axisLink.getSubValues().size() > 0 && axisLink.getSubValues()[0].length() > 0){
axEdge = linked->Shape.getShape().getSubShape(axisLink.getSubValues()[0].c_str());
} else {
axEdge = linked->Shape.getValue();
}
if (axEdge.IsNull())
throw Base::ValueError("DirLink shape is null");
if (axEdge.ShapeType() != TopAbs_EDGE)
throw Base::TypeError("DirLink shape is not an edge");
BRepAdaptor_Curve crv(TopoDS::Edge(axEdge));
gp_Pnt startpoint;
gp_Pnt endpoint;
if (crv.GetType() == GeomAbs_Line){
startpoint = crv.Value(crv.FirstParameter());
endpoint = crv.Value(crv.LastParameter());
if (axEdge.Orientation() == TopAbs_REVERSED)
std::swap(startpoint, endpoint);
} else {
throw Base::TypeError("DirLink edge is not a line.");
}
basepoint.Set(startpoint.X(), startpoint.Y(), startpoint.Z());
gp_Vec vec = gp_Vec(startpoint, endpoint);
dir.Set(vec.X(), vec.Y(), vec.Z());
return true;
}
Extrusion::ExtrusionParameters Extrusion::computeFinalParameters()
{
Extrusion::ExtrusionParameters result;
Base::Vector3d dir;
switch(this->DirMode.getValue()){
case dmCustom:
dir = this->Dir.getValue();
break;
case dmEdge:{
bool fetched;
Base::Vector3d base;
fetched = fetchAxisLink(this->DirLink, base, dir);
if (! fetched)
throw Base::Exception("DirMode is set to use edge, but no edge is linked.");
this->Dir.setValue(dir);
}break;
case dmNormal:
dir = calculateShapeNormal(this->Base);
this->Dir.setValue(dir);
break;
default:
throw Base::ValueError("Unexpected enum value");
}
if(dir.Length() < Precision::Confusion())
throw Base::ValueError("Direction is zero-length");
result.dir = gp_Dir(dir.x, dir.y, dir.z);
if (this->Reversed.getValue())
result.dir.Reverse();
result.lengthFwd = this->LengthFwd.getValue();
result.lengthRev = this->LengthRev.getValue();
if(fabs(result.lengthFwd) < Precision::Confusion()
&& fabs(result.lengthRev) < Precision::Confusion() ){
result.lengthFwd = dir.Length();
}
if (this->Symmetric.getValue()){
result.lengthRev = result.lengthFwd * 0.5;
result.lengthFwd = result.lengthFwd * 0.5;
}
if (fabs(result.lengthFwd + result.lengthRev) < Precision::Confusion())
throw Base::ValueError("Total length of extrusion is zero.");
result.solid = this->Solid.getValue();
result.taperAngleFwd = this->TaperAngle.getValue() * M_PI / 180.0;
if (fabs(result.taperAngleFwd) > M_PI * 0.5 - Precision::Angular() )
throw Base::ValueError("Magnitude of taper angle matches or exceeds 90 degrees. That is too much.");
result.taperAngleRev = this->TaperAngleRev.getValue() * M_PI / 180.0;
if (fabs(result.taperAngleRev) > M_PI * 0.5 - Precision::Angular() )
throw Base::ValueError("Magnitude of taper angle matches or exceeds 90 degrees. That is too much.");
return result;
}
Base::Vector3d Extrusion::calculateShapeNormal(const App::PropertyLink& shapeLink)
{
if (!shapeLink.getValue())
throw Base::Exception("calculateShapeNormal: link is empty");
const App::DocumentObject* docobj = shapeLink.getValue();
//special case for sketches and the like: no matter what shape they have, use their local Z axis.
if (docobj->isDerivedFrom(Part::Part2DObject::getClassTypeId())){
const Part::Part2DObject* p2do = static_cast<const Part::Part2DObject*>(docobj);
Base::Vector3d OZ (0.0, 0.0, 1.0);
Base::Vector3d result;
p2do->Placement.getValue().getRotation().multVec(OZ, result);
return result;
}
//extract the shape
if (! docobj->isDerivedFrom(Part::Feature::getClassTypeId()))
throw Base::TypeError("Linked object doesn't have shape.");
const TopoShape &tsh = static_cast<const Part::Feature*>(docobj)->Shape.getShape();
TopoDS_Shape sh = tsh.getShape();
if (sh.IsNull())
throw Base::Exception("calculateShapeNormal: link points to a valid object, but its shape is null.");
//find plane
BRepLib_FindSurface planeFinder(sh, -1, /*OnlyPlane=*/true);
if (! planeFinder.Found())
throw Base::ValueError("Can't find normal direction, because the shape is not on a plane.");
//find plane normal and return result.
GeomAdaptor_Surface surf(planeFinder.Surface());
gp_Dir normal = surf.Plane().Axis().Direction();
//now se know the plane. But if there are faces, the
//plane normal direction is not dependent on face orientation (because findPlane only uses egdes).
//let's fix that.
TopExp_Explorer ex(sh, TopAbs_FACE);
if(ex.More()) {
BRepAdaptor_Surface surf(TopoDS::Face(ex.Current()));
normal = surf.Plane().Axis().Direction();
if (ex.Current().Orientation() == TopAbs_REVERSED){
normal.Reverse();
}
}
return Base::Vector3d(normal.X(), normal.Y(), normal.Z());
}
TopoShape Extrusion::extrudeShape(const TopoShape source, Extrusion::ExtrusionParameters params)
{
TopoDS_Shape result;
gp_Vec vec = gp_Vec(params.dir).Multiplied(params.lengthFwd+params.lengthRev);//total vector of extrusion
if (std::fabs(params.taperAngleFwd) >= Precision::Angular() ||
std::fabs(params.taperAngleRev) >= Precision::Angular() ) {
//Tapered extrusion!
#if defined(__GNUC__) && defined (FC_OS_LINUX)
Base::SignalException se;
#endif
TopoDS_Shape myShape = source.getShape();
if (myShape.IsNull())
Standard_Failure::Raise("Cannot extrude empty shape");
// #0000910: Circles Extrude Only Surfaces, thus use BRepBuilderAPI_Copy
myShape = BRepBuilderAPI_Copy(myShape).Shape();
std::list<TopoDS_Shape> drafts;
makeDraft(params, myShape, drafts);
if (drafts.empty()) {
Standard_Failure::Raise("Drafting shape failed");
}
else if (drafts.size() == 1) {
result = drafts.front();
}
else {
TopoDS_Compound comp;
BRep_Builder builder;
builder.MakeCompound(comp);
for (std::list<TopoDS_Shape>::iterator it = drafts.begin(); it != drafts.end(); ++it)
builder.Add(comp, *it);
result = comp;
}
}
else {
//Regular (non-tapered) extrusion!
TopoDS_Shape myShape = source.getShape();
if (myShape.IsNull())
Standard_Failure::Raise("Cannot extrude empty shape");
// #0000910: Circles Extrude Only Surfaces, thus use BRepBuilderAPI_Copy
myShape = BRepBuilderAPI_Copy(myShape).Shape();
//apply reverse part of extrusion by shifting the source shape
if (fabs(params.lengthRev)>Precision::Confusion() ){
gp_Trsf mov;
mov.SetTranslation(gp_Vec(params.dir)*(-params.lengthRev));
TopLoc_Location loc(mov);
myShape.Move(loc);
}
//make faces from wires
if (params.solid && myShape.ShapeType() != TopAbs_FACE) {
std::vector<TopoDS_Wire> wires;
TopTools_IndexedMapOfShape mapOfWires;
TopExp::MapShapes(myShape, TopAbs_WIRE, mapOfWires);
// if there are no wires then check also for edges
if (mapOfWires.IsEmpty()) {
TopTools_IndexedMapOfShape mapOfEdges;
TopExp::MapShapes(myShape, TopAbs_EDGE, mapOfEdges);
for (int i=1; i<=mapOfEdges.Extent(); i++) {
BRepBuilderAPI_MakeWire mkWire(TopoDS::Edge(mapOfEdges.FindKey(i)));
wires.push_back(mkWire.Wire());
}
}
else {
wires.reserve(mapOfWires.Extent());
for (int i=1; i<=mapOfWires.Extent(); i++) {
wires.push_back(TopoDS::Wire(mapOfWires.FindKey(i)));
}
}
if (!wires.empty()) {
try {
TopoDS_Shape res = makeFace(wires);
if (!res.IsNull())
myShape = res;
}
catch (...) {
}
}
}
//extrude!
BRepPrimAPI_MakePrism mkPrism(myShape, vec);
result = mkPrism.Shape();
}
if (result.IsNull())
throw Base::Exception("Result of extrusion is null shape.");
return TopoShape(result);
}
App::DocumentObjectExecReturn *Extrusion::execute(void)
{
App::DocumentObject* link = Base.getValue();
if (!link)
return new App::DocumentObjectExecReturn("No object linked");
if (!link->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
return new App::DocumentObjectExecReturn("Linked object is not a Part object");
Part::Feature *base = static_cast<Part::Feature*>(Base.getValue());
try {
Extrusion::ExtrusionParameters params = computeFinalParameters();
TopoShape result = extrudeShape(base->Shape.getShape(),params);
this->Shape.setValue(result);
return App::DocumentObject::StdReturn;
}
catch (Standard_Failure) {
Handle_Standard_Failure e = Standard_Failure::Caught();
return new App::DocumentObjectExecReturn(e->GetMessageString());
}
}
void Extrusion::makeDraft(ExtrusionParameters params, const TopoDS_Shape& shape, std::list<TopoDS_Shape>& drafts)
{
double distanceFwd = tan(params.taperAngleFwd)*params.lengthFwd;
double distanceRev = tan(params.taperAngleRev)*params.lengthRev;
gp_Vec vecFwd = gp_Vec(params.dir)*params.lengthFwd;
gp_Vec vecRev = gp_Vec(params.dir.Reversed())*params.lengthRev;
bool bFwd = fabs(params.lengthFwd) > Precision::Confusion();
bool bRev = fabs(params.lengthRev) > Precision::Confusion();
bool bMid = !bFwd || !bRev || params.lengthFwd*params.lengthRev > 0.0; //include the source shape as loft section?
TopoDS_Wire sourceWire;
if (shape.IsNull())
Standard_Failure::Raise("Not a valid shape");
if (shape.ShapeType() == TopAbs_WIRE) {
ShapeFix_Wire aFix;
aFix.Load(TopoDS::Wire(shape));
aFix.FixReorder();
aFix.FixConnected();
aFix.FixClosed();
sourceWire = aFix.Wire();
}
else if (shape.ShapeType() == TopAbs_FACE) {
TopoDS_Wire outerWire = ShapeAnalysis::OuterWire(TopoDS::Face(shape));
sourceWire = outerWire;
}
else if (shape.ShapeType() == TopAbs_COMPOUND) {
TopoDS_Iterator it(shape);
for (; it.More(); it.Next()) {
makeDraft(params, it.Value(), drafts);
}
}
else {
Standard_Failure::Raise("Only a wire or a face is supported");
}
if (!sourceWire.IsNull()) {
std::list<TopoDS_Wire> list_of_sections;
//first. add wire for reversed part of extrusion
if (bRev){
gp_Vec translation = vecRev;
double offset = distanceRev;
BRepOffsetAPI_MakeOffset mkOffset;
#if OCC_VERSION_HEX >= 0x060800
mkOffset.Init(GeomAbs_Arc);
#endif
#if OCC_VERSION_HEX >= 0x070000
mkOffset.Init(GeomAbs_Intersection);
#endif
gp_Trsf mat;
mat.SetTranslation(translation);
TopLoc_Location loc(mat);
TopoDS_Wire movedSourceWire = TopoDS::Wire(sourceWire.Moved(loc));
TopoDS_Shape offsetShape;
if (fabs(offset)>Precision::Confusion()){
mkOffset.AddWire(movedSourceWire);
mkOffset.Perform(offset);
offsetShape = mkOffset.Shape();
} else {
//stupid OCC doesn't understand, what to do when offset value is zero =/
offsetShape = movedSourceWire;
}
if (offsetShape.IsNull())
Standard_Failure::Raise("Tapered shape is empty");
TopAbs_ShapeEnum type = offsetShape.ShapeType();
if (type == TopAbs_WIRE) {
list_of_sections.push_back(TopoDS::Wire(offsetShape));
}
else if (type == TopAbs_EDGE) {
BRepBuilderAPI_MakeWire mkWire(TopoDS::Edge(offsetShape));
list_of_sections.push_back(mkWire.Wire());
}
else {
Standard_Failure::Raise("Tapered shape type is not supported");
}
}
//next. Add source wire as middle section. Order is important.
if (bMid){
list_of_sections.push_back(sourceWire);
}
//finally. Forward extrusion offset wire.
if (bFwd){
gp_Vec translation = vecFwd;
double offset = distanceFwd;
BRepOffsetAPI_MakeOffset mkOffset;
#if OCC_VERSION_HEX >= 0x060800
mkOffset.Init(GeomAbs_Arc);
#endif
#if OCC_VERSION_HEX >= 0x070000
mkOffset.Init(GeomAbs_Intersection);
#endif
gp_Trsf mat;
mat.SetTranslation(translation);
TopLoc_Location loc(mat);
TopoDS_Wire movedSourceWire = TopoDS::Wire(sourceWire.Moved(loc));
TopoDS_Shape offsetShape;
if (fabs(offset)>Precision::Confusion()){
mkOffset.AddWire(movedSourceWire);
mkOffset.Perform(offset);
offsetShape = mkOffset.Shape();
} else {
//stupid OCC doesn't understand, what to do when offset value is zero =/
offsetShape = movedSourceWire;
}
if (offsetShape.IsNull())
Standard_Failure::Raise("Tapered shape is empty");
TopAbs_ShapeEnum type = offsetShape.ShapeType();
if (type == TopAbs_WIRE) {
list_of_sections.push_back(TopoDS::Wire(offsetShape));
}
else if (type == TopAbs_EDGE) {
BRepBuilderAPI_MakeWire mkWire(TopoDS::Edge(offsetShape));
list_of_sections.push_back(mkWire.Wire());
}
else {
Standard_Failure::Raise("Tapered shape type is not supported");
}
}
//make loft
BRepOffsetAPI_ThruSections mkGenerator(params.solid ? Standard_True : Standard_False, /*ruled=*/Standard_True);
for (std::list<TopoDS_Wire>::const_iterator it = list_of_sections.begin(); it != list_of_sections.end(); ++it) {
const TopoDS_Wire &wire = *it;
mkGenerator.AddWire(wire);
}
try {
#if defined(__GNUC__) && defined (FC_OS_LINUX)
Base::SignalException se;
#endif
mkGenerator.Build();
drafts.push_back(mkGenerator.Shape());
}
catch (Standard_Failure &){
throw;
}
catch (...) {
throw Base::Exception("Unknown exception from BRepOffsetAPI_ThruSections");
}
}
}
TopoDS_Face Extrusion::validateFace(const TopoDS_Face& face)
{
BRepCheck_Analyzer aChecker(face);
if (!aChecker.IsValid()) {
TopoDS_Wire outerwire = ShapeAnalysis::OuterWire(face);
TopTools_IndexedMapOfShape myMap;
myMap.Add(outerwire);
TopExp_Explorer xp(face,TopAbs_WIRE);
ShapeFix_Wire fix;
fix.SetFace(face);
fix.Load(outerwire);
fix.Perform();
BRepBuilderAPI_MakeFace mkFace(fix.WireAPIMake());
while (xp.More()) {
if (!myMap.Contains(xp.Current())) {
fix.Load(TopoDS::Wire(xp.Current()));
fix.Perform();
mkFace.Add(fix.WireAPIMake());
}
xp.Next();
}
aChecker.Init(mkFace.Face());
if (!aChecker.IsValid()) {
ShapeFix_Shape fix(mkFace.Face());
fix.SetPrecision(Precision::Confusion());
fix.SetMaxTolerance(Precision::Confusion());
fix.SetMaxTolerance(Precision::Confusion());
fix.Perform();
fix.FixWireTool()->Perform();
fix.FixFaceTool()->Perform();
TopoDS_Face fixedFace = TopoDS::Face(fix.Shape());
aChecker.Init(fixedFace);
if (!aChecker.IsValid())
Standard_Failure::Raise("Failed to validate broken face");
return fixedFace;
}
return mkFace.Face();
}
return face;
}
// sort bounding boxes according to diagonal length
class Extrusion::Wire_Compare : public std::binary_function<const TopoDS_Wire&,
const TopoDS_Wire&, bool> {
public:
bool operator() (const TopoDS_Wire& w1, const TopoDS_Wire& w2)
{
Bnd_Box box1, box2;
if (!w1.IsNull()) {
BRepBndLib::Add(w1, box1);
box1.SetGap(0.0);
}
if (!w2.IsNull()) {
BRepBndLib::Add(w2, box2);
box2.SetGap(0.0);
}
return box1.SquareExtent() < box2.SquareExtent();
}
};
bool Extrusion::isInside(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2)
{
Bnd_Box box1;
BRepBndLib::Add(wire1, box1);
box1.SetGap(0.0);
Bnd_Box box2;
BRepBndLib::Add(wire2, box2);
box2.SetGap(0.0);
if (box1.IsOut(box2))
return false;
double prec = Precision::Confusion();
BRepBuilderAPI_MakeFace mkFace(wire1);
if (!mkFace.IsDone())
Standard_Failure::Raise("Failed to create a face from wire in sketch");
TopoDS_Face face = validateFace(mkFace.Face());
BRepAdaptor_Surface adapt(face);
IntTools_FClass2d class2d(face, prec);
Handle_Geom_Surface surf = new Geom_Plane(adapt.Plane());
ShapeAnalysis_Surface as(surf);
TopExp_Explorer xp(wire2,TopAbs_VERTEX);
while (xp.More()) {
TopoDS_Vertex v = TopoDS::Vertex(xp.Current());
gp_Pnt p = BRep_Tool::Pnt(v);
gp_Pnt2d uv = as.ValueOfUV(p, prec);
if (class2d.Perform(uv) == TopAbs_IN)
return true;
// TODO: We can make a check to see if all points are inside or all outside
// because otherwise we have some intersections which is not allowed
else
return false;
//xp.Next();
}
return false;
}
TopoDS_Shape Extrusion::makeFace(std::list<TopoDS_Wire>& wires)
{
BRepBuilderAPI_MakeFace mkFace(wires.front());
const TopoDS_Face& face = mkFace.Face();
if (face.IsNull())
return face;
gp_Dir axis(0,0,1);
BRepAdaptor_Surface adapt(face);
if (adapt.GetType() == GeomAbs_Plane) {
axis = adapt.Plane().Axis().Direction();
}
wires.pop_front();
for (std::list<TopoDS_Wire>::iterator it = wires.begin(); it != wires.end(); ++it) {
BRepBuilderAPI_MakeFace mkInnerFace(*it);
const TopoDS_Face& inner_face = mkInnerFace.Face();
if (inner_face.IsNull())
return inner_face; // failure
gp_Dir inner_axis(0,0,1);
BRepAdaptor_Surface adapt(inner_face);
if (adapt.GetType() == GeomAbs_Plane) {
inner_axis = adapt.Plane().Axis().Direction();
}
// It seems that orientation is always 'Forward' and we only have to reverse
// if the underlying plane have opposite normals.
if (axis.Dot(inner_axis) < 0)
it->Reverse();
mkFace.Add(*it);
}
return validateFace(mkFace.Face());
}
TopoDS_Shape Extrusion::makeFace(const std::vector<TopoDS_Wire>& w)
{
if (w.empty())
return TopoDS_Shape();
//FIXME: Need a safe method to sort wire that the outermost one comes last
// Currently it's done with the diagonal lengths of the bounding boxes
std::vector<TopoDS_Wire> wires = w;
std::sort(wires.begin(), wires.end(), Wire_Compare());
std::list<TopoDS_Wire> wire_list;
wire_list.insert(wire_list.begin(), wires.rbegin(), wires.rend());
// separate the wires into several independent faces
std::list< std::list<TopoDS_Wire> > sep_wire_list;
while (!wire_list.empty()) {
std::list<TopoDS_Wire> sep_list;
TopoDS_Wire wire = wire_list.front();
wire_list.pop_front();
sep_list.push_back(wire);
std::list<TopoDS_Wire>::iterator it = wire_list.begin();
while (it != wire_list.end()) {
if (isInside(wire, *it)) {
sep_list.push_back(*it);
it = wire_list.erase(it);
}
else {
++it;
}
}
sep_wire_list.push_back(sep_list);
}
if (sep_wire_list.size() == 1) {
std::list<TopoDS_Wire>& wires = sep_wire_list.front();
return makeFace(wires);
}
else if (sep_wire_list.size() > 1) {
TopoDS_Compound comp;
BRep_Builder builder;
builder.MakeCompound(comp);
for (std::list< std::list<TopoDS_Wire> >::iterator it = sep_wire_list.begin(); it != sep_wire_list.end(); ++it) {
TopoDS_Shape aFace = makeFace(*it);
if (!aFace.IsNull())
builder.Add(comp, aFace);
}
return comp;
}
else {
return TopoDS_Shape(); // error
}
}
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