[IGSTK-Developers] Solved registration problem mentioned in last TCon by inverting regtransform

[Torleif Sandnes]

Hello.

I have found a solution to the problem I had with landmarkregistration:

I set up the scenegraph with the image, tracker, trackertool and view  
like this:

image->RequestSetTransformAndParent(identity, tracker.GetPointer())
...
trackerTool->RequestSetTransformAndParent(identity, image);
pointerSpatialObject->RequestSetTransformAndParent(transform,  
trackerTool.GetPointer());

view->RequestSetTransformAndParent(identity, image);
...

                tracker
                 /
                / <--- Landmark Registration Transform goes here
               /
            image
             /  \
            /    \
           /      \
    trackertool   view

After registration:
image->RequestSetTransformAndParent(registrationTransform, tracker);

This resulted in a registration that moved the pointer rep further  
away from the volumerendering, so
I tried to inverse the registration transform I got from  
igstk::Landmark3DRegistrationTransform:

image->RequestSetTransformAndParent(registrationTransform.GetInverse 
(), tracker);

This resulted in a registration that works.

Regards,
Torleif