[vtkusers] matrix manipulation

[David Gauldie]

Hello all,

I am tracking a target using a 3D camera. I am gathering 4X4matrixes at 
different time points. What I want to do is find out the position (easy 
enough) and a direction vector of which way the target is facing (i.e. using 
a cone representation of the target I want to know which way the tip of the 
cone is facing). I tried using vtkTransform->GetOrientation(), but I'm not 
sure what this is giving me and it doesn't seem to give me the correct 
results (or at least the results I'm looking for).

If anyone can give me some insight into this problem, or tell me if this is 
the way to go about doing this sort of thing, I'd really appreciate it.

thanks in advance,


David Gauldie

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