[vtkusers] Transformations and Matrices

[Andres Barrera]

Dear list,

   I am having some hard time by applying sequences of transformations 
ussing different ways, and trying to get possitions and orientations 
back.....

   I've been reading the vtk books and documentation, and  experimenting 
with:
      - Position and Orientation
      - Matrix  , UserMatrix, and  UserTransform ,
      - using someActor->RotateWXYZ ( qw,qx,qy,qz);
                someActor->SetPosition( x,y,z);
        and
      - someTransform->Translate ( posX, posY, posZ);
        someTransform->RotateWXYZ ( qw,qx,qy,qz);
        someTransform->Translate ( offsetX, offsetY, offsetZ);
        someTransform->Translate ( ............);

        someActor->SetUserTransform(someTransform);

      - etc.

   Basically I am able of locating the actors where I want in many different 
ways, but when I want to get its possitions/orientations, transformations, 
and/or matrices, I have lots of inconsistencies.

is there any tutorial, example, or something that makes clear all following 
con

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