[IGSTK-Users] Camera positioning and orientation based on Spatial Object

[Patrick Cheng]

Hi Aswin,

The new coordinate system API we added into IGSTK can possibly help 
solve your problem very easily.

Take a look at the NeedleBiopsy example application, and the 
documentation page on our wiki, detailing how to connect the scene graph:

http://public.kitware.com/IGSTKWIKI/index.php/Needle_Biopsy#How_to_connect_the_scene_graph

Bullet point 7:
" The flexible scene graph design not only allows you to compute the 
transform between any two connected points in the scene graph tree but 
also allows you to see the world from different perspective. For 
example, if you want to observe the scene from a NeedTip's point of view 
as it's moving in the patient anatomy, just attach the View to the 
NeedleTip."


We haven't tried this capability in a real application. If you could 
test it in your application and give us some feed back, that would be great.

Thank you,

Patrick


Aswin Mathews wrote:
> Hi,
> 
> I want to bind my View to a Spatial Object. That is, I want the Camera 
> position and orientation to be a function of the Transform of a 
> particular spatial object. Essentially, this is to give the surgeon the 
> view at the end of a catheter.
> 
> I was thinking of adding the lines to igstkView::RefreshRender(). Is 
> there a better / less painful way to achieve this?
> 
> How about a m_CameraTransform variable in igstkView which can be bound 
> to a igstkSpatialObject:m_Transform (using some Request function) which 
> is then automatically taken into consideration during 
> igstkView::RefreshRender() ?
> 
> Any help is appreciated.
> Thanks,
> 
> Aswin.
> 
> 
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