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

[Patrick Cheng]

Hi Aswin,

There is also a test program in IGSTK showing the effects of attaching 
View to different objects.

igstkSpatialObjectRepresentationVisibilityTest.cxx

Line 440:

  //
   // Now attach the View to the Tracker tool, in order to illustrate
   // how a display "from the point of view of the tracker tool" can
   // easily be obtained.
   //
   view3D->RequestSetTransformAndParent( identityTransform, trackerTool );

   viewObserver->SetNumberOfPulsesToStop( 50 );
   viewObserver->Reset();

   view3D->RequestStart();

   tracker->RequestOpen();
   tracker->RequestStartTracking();


Patrick

Patrick Cheng wrote:
> 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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>>
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