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//=======================================================================
// File: StlTransfer.cxx
// Created: Fri Jun 23 14:36:58 2000
// Author: Sergey MOZOKHIN
// <smh@russox.nnov.matra-dtv.fr>
#include <StlTransfer.ixx>
#include <Standard_ErrorHandler.hxx>
#include <Standard_Failure.hxx>
#include <TopoDS_Face.hxx>
#include <Poly_Connect.hxx>
#include <TColgp_Array1OfDir.hxx>
#include <Poly_Triangulation.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <TopLoc_Location.hxx>
#include <Geom_Surface.hxx>
#include <BRep_Tool.hxx>
#include <gp_Vec.hxx>
#include <gp_Pnt.hxx>
#include <CSLib.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <CSLib.hxx>
#include <gp_Dir.hxx>
#include <gp_XYZ.hxx>
#include <BRepMesh.hxx>
#include <TopAbs.hxx>
#include <Precision.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TColgp_SequenceOfXYZ.hxx>
//function computes normals for surface
static void Normal(const TopoDS_Face& aFace,
Poly_Connect& pc,
TColgp_Array1OfDir& Nor)
{
const Handle(Poly_Triangulation)& T = pc.Triangulation();
BRepAdaptor_Surface S;
Standard_Boolean hasUV = T->HasUVNodes();
Standard_Integer i;
TopLoc_Location l;
Handle(Geom_Surface) GS = BRep_Tool::Surface(aFace, l);
if (hasUV && !GS.IsNull()) {
Standard_Boolean OK = Standard_True;
gp_Vec D1U,D1V;
gp_Vec D2U,D2V,D2UV;
gp_Pnt P;
Standard_Real U, V;
CSLib_DerivativeStatus Status;
CSLib_NormalStatus NStat;
S.Initialize(aFace, Standard_False);
const TColgp_Array1OfPnt2d& UVNodes = T->UVNodes();
if (!S.GetType() == GeomAbs_Plane) {
for (i = UVNodes.Lower(); i <= UVNodes.Upper(); i++) {
U = UVNodes(i).X();
V = UVNodes(i).Y();
S.D1(U,V,P,D1U,D1V);
CSLib::Normal(D1U,D1V,Precision::Angular(),Status,Nor(i));
if (Status != CSLib_Done) {
S.D2(U,V,P,D1U,D1V,D2U,D2V,D2UV);
CSLib::Normal(D1U,D1V,D2U,D2V,D2UV,Precision::Angular(),OK,NStat,Nor(i));
}
if (aFace.Orientation() == TopAbs_REVERSED) (Nor(i)).Reverse();
}
}
else {
gp_Dir NPlane;
U = UVNodes(UVNodes.Lower()).X();
V = UVNodes(UVNodes.Lower()).Y();
S.D1(U,V,P,D1U,D1V);
CSLib::Normal(D1U,D1V,Precision::Angular(),Status,NPlane);
if (Status != CSLib_Done) {
S.D2(U,V,P,D1U,D1V,D2U,D2V,D2UV);
CSLib::Normal(D1U,D1V,D2U,D2V,D2UV,Precision::Angular(),OK,NStat,NPlane);
}
if (aFace.Orientation() == TopAbs_REVERSED) NPlane.Reverse();
Nor.Init(NPlane);
}
}
else {
const TColgp_Array1OfPnt& Nodes = T->Nodes();
Standard_Integer n[3];
const Poly_Array1OfTriangle& triangles = T->Triangles();
for (i = Nodes.Lower(); i <= Nodes.Upper(); i++) {
gp_XYZ eqPlan(0, 0, 0);
for (pc.Initialize(i); pc.More(); pc.Next()) {
triangles(pc.Value()).Get(n[0], n[1], n[2]);
gp_XYZ v1(Nodes(n[1]).Coord()-Nodes(n[0]).Coord());
gp_XYZ v2(Nodes(n[2]).Coord()-Nodes(n[1]).Coord());
eqPlan += (v1^v2).Normalized();
}
Nor(i) = gp_Dir(eqPlan);
if (aFace.Orientation() == TopAbs_REVERSED) (Nor(i)).Reverse();
}
}
}
void StlTransfer::BuildIncrementalMesh (const TopoDS_Shape& Shape,
const Standard_Real Deflection,
const Handle(StlMesh_Mesh)& Mesh)
{
if (Deflection <= Precision::Confusion ()) {
Standard_ConstructionError::Raise ("StlTransfer::BuildIncrementalMesh");
}
BRepMesh::Mesh (Shape, Deflection);
for (TopExp_Explorer itf(Shape,TopAbs_FACE); itf.More(); itf.Next()) {
TopoDS_Face face = TopoDS::Face(itf.Current());
TopLoc_Location Loc, loc;
Handle(Poly_Triangulation) theTriangulation = BRep_Tool::Triangulation(face, Loc);
if (theTriangulation.IsNull()) continue; //Meshing was not done for this face!
Poly_Array1OfTriangle theTriangles(1,theTriangulation->NbTriangles());
theTriangles.Assign(theTriangulation->Triangles());
Mesh->AddDomain (Deflection);
TColgp_Array1OfPnt thePoints(1, theTriangulation->NbNodes());
thePoints.Assign(theTriangulation->Nodes());
//compute normal of face
const TColgp_Array1OfPnt& Nodes = theTriangulation->Nodes();
TColgp_Array1OfDir NORMAL(Nodes.Lower(), Nodes.Upper());
Poly_Connect pc(theTriangulation);
Normal(face, pc, NORMAL);
Standard_Integer i;
for(i=1;i<=thePoints.Length();i++) {
Standard_Real X1, Y1, Z1;
gp_Pnt p = thePoints.Value(i);
p.Transform(Loc.Transformation());
p.Coord (X1, Y1, Z1);
Mesh->AddVertex (X1, Y1, Z1);
}
try {
OCC_CATCH_SIGNALS
for (i=1;i<=theTriangles.Length();i++) {
Standard_Integer V1, V2, V3;
Poly_Triangle triangle = theTriangles.Value(i);
triangle.Get(V1, V2, V3);
gp_Pnt P1, P2, P3;
P1 = Mesh->Vertices(Mesh->NbDomains()).Value(V1);
P2 = Mesh->Vertices(Mesh->NbDomains()).Value(V2);
P3 = Mesh->Vertices(Mesh->NbDomains()).Value(V3);
gp_Vec average = NORMAL(V1);;
//check angle between vectors
gp_Vec V1V2(P1, P2), V2V3(P2, P3);
Standard_Integer A,B,C;
gp_Vec vec = V1V2^V2V3;
Standard_Real modul1, modul2;
modul1 = average.XYZ().Modulus();
modul2 = vec.XYZ().Modulus();
if (modul2>Precision::Confusion ()) vec.Divide(modul2);
A=V1;B=V2;C=V3;
// vec.Transform(loc);
if (modul1>Precision::Confusion () && modul2>Precision::Confusion ()) {
Standard_Real an = vec.Angle(average);
if ( an > PI/2) {
A = V3;B=V2;C=V1;
}
else {
A=V1;B=V2;C=V3;
}
}
Mesh->AddTriangle (A, B, C, average.X(), average.Y(), average.Z());
}
}
catch(Standard_Failure)
{
#ifdef DEB
cout << "Fail in StlTransfer::BuildIncrementalMesh" << endl;
#endif
}
}
}
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