[vtkusers] Setting up a vtkCamera with a general perspectivetransform

[Andreas Keil]

OK, I was digging deeper into VTK and did not find any solution to my
problem :-(

What I have is a perspective transformation matrix

      [ f1   s  p1 ]
  K = [  0  f2  p2 ]
      [      0   1 ]

(with focal lengths f1 and f2, principal point (p1, p2) and skew s. (I
obtained K from a decomposition of a 3x4 projection matrix P into P =
s*K*[R|t].)

I am still not able to set this as camera matrix in VTK. If anyone knows
any solution to this problem (or at least that there is no solution) I
would really appreciate it.

Thank you all,
Andreas.



-----Original Message-----
From: vtkusers-bounces+andreas.keil=cs.tum.edu at vtk.org
[mailto:vtkusers-bounces+andreas.keil=cs.tum.edu at vtk.org] On Behalf Of
Andreas Keil
Sent: Wednesday, May 16, 2007 17:18
To: vtkusers at vtk.org
Subject: [vtkusers] Setting up a vtkCamera with a general
perspectivetransform

Dear all,

what is the easiest way to plug my own homogeneous 3x4 projection matrix
into a vtkCamera?

- Do I have to compute a set of parameters from my matrix and use a
combination of some Set methods of vtkCamera?
- May I use vtkCamera::SetUserTransform and if yes, how?
- Or is there any other solution I should follow?

My 3x4 projection matrix P maps homogeneous world coordinates to
homogeneous viewing coordinates: p2 = P*p3

Thank you,
Andreas.

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