[vtkusers] How to get the vtk equivalents of OpenGL projection matrix?

[Xianwang Wang]

Dear all,
   
  Using VTK with the following code, I can get the same modelview matrix as OpenGL¡¯s, but the projection matrix. 
   
  The projection matrix got from VTK: 
   
  1.944445 0.000000 0.000000 0.000000
0.000000 -2.592594 0.000000 0.000000
0.000000 0.000000 -1.040816 -1.000000
0.000000 0.000000 -40.816326 0.000000
   
    
The projection matrix got from OpenGL:
   
  1.9444455063180441 0.00000000000000000 0.00000000000000000 0.00000000000000000 
  0.00000000000000000 2.5925940084240588 0.00000000000000000 0.00000000000000000
  0.00000000000000000 0.00000000000000000 -1020.0000000000000 -20000.000000000000
  0.00000000000000000 0.00000000000000000 -1.0000000000000000 0.00000000000000000
   
   
  Here is my code:
   
  vtkOpenGLCamera* cam = (vtkOpenGLCamera*)ren1->GetActiveCamera();
  cam->SetPosition(110.955,100.0,73.0);
  cam->SetFocalPoint(-67.1446,126.404,-17.5055);
  cam->SetViewAngle(42.184658);
  cam->SetViewUp(0.0,0.0,1.0);
  cam->SetClippingRange(20.0, 1000.0);
  cam->ComputeViewPlaneNormal();
  vtkMatrix4x4* v = cam->GetViewTransformMatrix();
  vtkMatrix4x4* v1 = cam->GetPerspectiveTransformMatrix(640.0/480,20.0,1000.0);
   
  Could someone give me some suggestion about this problem? Really appreciate that!
   
  Ivan Wang

		
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