使用Opencascade读取igs文件内模型，使用vtk进行显示。
本案例环境：Opencascade6.6.0 + vtk-5.10 + VS2005（win32）
使用CMake管理工程。
CMakeLists.txt ：
PROJECT (IgesReader)
#VTK Part:
FIND_PACKAGE(VTK)
IF (VTK_FOUND)
INCLUDE(${VTK_USE_FILE})
ELSE(VTK_FOUND)
MESSAGE(FATAL_ERROR
"Cannot build without VTK. Please set VTK_DIR.")
ENDIF (VTK_FOUND)
#OpenCascade Part:
INCLUDE_DIRECTORIES(
C:OpenCASCADE6.6.0
osinc
)
LINK_LIBRARIES(
vtkCommon
vtkGraphics
vtkRendering
vtkIO
C:OpenCASCADE6.6.0
oswin32vc8libdTKIGES.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKernel.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKBRep.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKMath.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKGeomBase.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKGeomAlgo.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKG3d.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKG2d.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKTopAlgo.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKXSBase.lib
C:OpenCASCADE6.6.0
oswin32vc8libdTKMesh.lib
)
ADD_EXECUTABLE(IgesReader Readiges.cpp)
main.cpp：
#define WNT
#include <gp_Circ.hxx>
#include <gp_Elips.hxx>
#include <gp_Sphere.hxx>
#include <Poly_Polygon3D.hxx>
#include <Poly_Triangulation.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <TopTools_HSequenceOfShape.hxx>
#include <BRepBuilderAPI_MakeVertex.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <IGESControl_Controller.hxx>
#include <IGESControl_Writer.hxx>
#include <IGESControl_Reader.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS.hxx>
#include <BRep_Tool.hxx>
#include <BRepMesh.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <BRepAdaptor_Curve.hxx>
#include <GCPnts_TangentialDeflection.hxx>
#include <TopExp_Explorer.hxx>
#include <Standard_TypeDef.hxx>
#include <iostream>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
//vtk lib
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkCellArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkTriangle.h>
Standard_Integer ReadIGES(const Standard_CString& aFileName,
Handle(TopTools_HSequenceOfShape)& aHSequenceOfShape)
{
IGESControl_Reader Reader;
Standard_Integer status = Reader.ReadFile(aFileName);
if (status != IFSelect_RetDone)
{
return status;
}
Reader.TransferRoots();
TopoDS_Shape aShape = Reader.OneShape();
aHSequenceOfShape->Append(aShape);
return status;
}
void BuildMesh(vtkRenderer* render, const TopoDS_Face& face, double deflection = 0.1)
{
TopLoc_Location location;
BRepMesh::Mesh(face, deflection);
Handle_Poly_Triangulation triFace = BRep_Tool::Triangulation(face, location);
Standard_Integer nTriangles = triFace->NbTriangles();
gp_Pnt vertex1;
gp_Pnt vertex2;
gp_Pnt vertex3;
Standard_Integer nVertexIndex1 = 0;
Standard_Integer nVertexIndex2 = 0;
Standard_Integer nVertexIndex3 = 0;
TColgp_Array1OfPnt nodes(1, triFace->NbNodes());
Poly_Array1OfTriangle triangles(1, triFace->NbTriangles());
nodes = triFace->Nodes();
triangles = triFace->Triangles();
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New();
vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
points->Allocate(nTriangles * 3);
cells->Allocate(nTriangles);
int id = 0;
for (Standard_Integer i = 1; i <= nTriangles; i++)
{
Poly_Triangle aTriangle = triangles.Value(i);
aTriangle.Get(nVertexIndex1, nVertexIndex2, nVertexIndex3);
vertex1 = nodes.Value(nVertexIndex1).Transformed(location.Transformation());
vertex2 = nodes.Value(nVertexIndex2).Transformed(location.Transformation());
vertex3 = nodes.Value(nVertexIndex3).Transformed(location.Transformation());
points->InsertNextPoint(vertex1.X(), vertex1.Y(), vertex1.Z());
points->InsertNextPoint(vertex2.X(), vertex2.Y(), vertex2.Z());
points->InsertNextPoint(vertex3.X(), vertex3.Y(), vertex3.Z());
vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New();
triangle->GetPointIds()->SetId(0,id * 3);
triangle->GetPointIds()->SetId(1,id * 3 + 1);
triangle->GetPointIds()->SetId(2,id *3 + 2);
// Add the triangle to a cell array
cells->InsertNextCell(triangle);
id++;
}
polyData->SetPoints(points);
polyData->SetPolys(cells);
vtkSmartPointer<vtkPolyDataMapper> sourceMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
sourceMapper->SetInput(polyData);
vtkSmartPointer<vtkActor> sourceActor = vtkSmartPointer<vtkActor>::New();
sourceActor->SetMapper(sourceMapper);
sourceActor->GetProperty()->SetColor(1,0,0);
render->AddActor(sourceActor);
}
void BuildScene( vtkRenderer *renderer, Handle(TopTools_HSequenceOfShape)& aHSequenceOfShape)
{
Standard_Integer index = aHSequenceOfShape->Length();
TopoDS_Shape theCompSolid = aHSequenceOfShape->ChangeValue(index);
for (TopExp_Explorer faceExp(theCompSolid, TopAbs_FACE); faceExp.More(); faceExp.Next())
{
// The 3d-mesh of the FACE is assembled to form the
// boundary of the SOLID.
const TopoDS_Face& theFace = TopoDS::Face(faceExp.Current());
BuildMesh(renderer, theFace );
}
}
int main(void)
{
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
Handle(TopTools_HSequenceOfShape) aHSequenceOfShape = new TopTools_HSequenceOfShape();
Standard_Integer status = ReadIGES("e:\p3.igs",aHSequenceOfShape);
cout<<"return status:"<<status<<endl;
BuildScene(renderer, aHSequenceOfShape);
renderer->SetBackground(1,1,1);
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return 0;
}
实例显示：
