[IGSTK-Users] Crosshair and image reslice issue

[Vincent Gratsac]

Hi all,

I'm experiencing some display problems with 
igstk::CrossHairRepresentation and image reslicing in my application. I 
also get this issue when using IGSTK examples.
For example, let's compare Navigator and NeedleBiopsy demo applications :

NeedleBiopsy examle doesn't use crosshair and image representations are 
well displayed in the 3D view; Navigator example displays crosshairs in 
2D and 3D views, and these crosshairs have an unexpected effect on image 
slice
representations in 3D views.

Each slice seems to "move" relatively to other slices, when moving 
camera position. This has an important impact on visualization consistency.
Some screenshots are attached to illustrate the issue : the yellow 
crosshair did not move on each screenshot, but image slices are 
displayed sometimes on one side of the crosshair and sometimes on the 
other side of it.
Some red circles underline this effect.

The problem still exists if we remove CrossHairRepresentation from 3D 
view. It disappears when no crosshair is displayed at all.
I reproduced the issue with IGSTK 4.2 and IGSTK 4.4.

I noticed that IGSTK developers are currently working on a new 
ImageSliceRepresentation class. Does it resolve this issue ?
Is there a way to display crosshairs on 2D views without encountering 
this major bug on the 3D view?

Thanks for your help.
Best regards,

Vincent
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