[vtkusers] matrix manipulation

[David Gauldie]

Hello all,

I'm tracking a target with a 3D camera. I'm collecting a series of 
vtkMatrix4x4's at different time points. From these I want to find their 
position (easy enough) and it's orientation vector (i.e. if the target is 
represented by a cone, which way is the tip of the cone pointing).

I tried using the vtkTransform->GetOrientation() function, but it wasn't 
giving me the results that I am looking for, and actually I'm not sure what 
it's supposed to be giving me.

If anyone can tell me how to go about doing this, or tell me if there is a 
better way of doing this, I would really appreciate it.

thanks,


David Gauldie
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