[vtkusers] VTK rendering pipeline - ray casting

[Juan Carlos Prieto]

Hi Julien,

I managed to do it by creating a camera a setting it to the renderer 
instead of using the renderer's camera.

thank you.

Le 30/09/2011 14:50, Juan Carlos Prieto a écrit :
> Hi Julien,
>
> Yes the 3D position, so I'm now using the vtkPropPicker, this picker 
> will actually give me the world position in the actor where the hit 
> occurred.
> I'm trying to solve another problem now. When I change the camera's 
> position and view direction, the actor is not rendered unless I 
> perform some interaction with the window (e.x. left click, zoom etc.), 
> If I perform the pick then the result is empty.
>
> The idea is to find a set of intersections given a set of rays, so I 
> don't know how to update the view with out the interaction.
>
> Is there a way to do this?
>
> Le 30/09/2011 14:03, Julien Finet a écrit :
>> Hi Juan,
>> if you use a cellpicker, keep in mind that the volume ray caster is 
>> under the hood a cube with 6 faces (technically, with 12triangular 
>> faces). So you always pick the bounds of the volume.
>> Are you sure you are interested in the cell and not the 3D position ?
>> julien.
>>
>> On Fri, Sep 30, 2011 at 7:38 AM, Juan Carlos Prieto 
>> <prieto at creatis.insa-lyon.fr <mailto:prieto at creatis.insa-lyon.fr>> wrote:
>>
>>     Hi Julien,
>>
>>     Thank you very much for the presentation, I kept on looking and I
>>     saw that using a vtkCellPicker might do the job of finding the
>>     intersection of a ray against an actor in a renderer.
>>     To do this, I'm moving the camera to look in the direction where
>>     I want the intersection to happen, but it seems that after
>>     producing the pick, it always finds the same cell in the actor.
>>
>>     Can you give me some suggestion on how should I do this?
>>
>>     Thank you very much
>>
>>     Le 29/09/2011 20:22, Julien Finet a écrit :
>>>     Hi Juan,
>>>
>>>
>>>     You can find a GPU ray casting high level presentation in the
>>>     Kitware Source of October 2009:
>>>     http://www.kitware.com/products/archive/kitware_quarterly0708.pdf
>>>
>>>     Hth,
>>>     Julien.
>>>
>>>     On Thu, Sep 29, 2011 at 11:54 AM, Juan Carlos Prieto
>>>     <prieto at creatis.insa-lyon.fr
>>>     <mailto:prieto at creatis.insa-lyon.fr>> wrote:
>>>
>>>         Dear VTK Users,
>>>
>>>         I was wondering if anyone can point me out to the
>>>         documentation of the VTK rendering pipeline, I want to
>>>         analyze how the ray casting is done as I came across a
>>>         little problem where I need find the point of intersection
>>>         in the surface.
>>>
>>>         Thank you very much.
>>>
>>>         -- 
>>>         Juan Carlos Prieto
>>>         Phd Student
>>>         CREATIS <http://www.creatis.insa-lyon.fr> Tel:+33472438918
>>>         <tel:%2B33472438918>
>>>         7 Av Jean Capelle
>>>         69621 Villeurbanne Cedex
>>>         France
>>>         Personal page <http://www.creatis.insa-lyon.fr/%7Eprieto>
>>>
>>>         _______________________________________________
>>>         Powered by www.kitware.com <http://www.kitware.com>
>>>
>>>         Visit other Kitware open-source projects at
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>>>
>>>         Please keep messages on-topic and check the VTK FAQ at:
>>>         http://www.vtk.org/Wiki/VTK_FAQ
>>>
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>>>
>>
>>     -- 
>>     Juan Carlos Prieto
>>     Phd Student
>>     CREATIS <http://www.creatis.insa-lyon.fr> Tel:+33472438918
>>     <tel:%2B33472438918>
>>     7 Av Jean Capelle
>>     69621 Villeurbanne Cedex
>>     France
>>     Personal page <http://www.creatis.insa-lyon.fr/%7Eprieto>
>>
>>
>
> -- 
> Juan Carlos Prieto
> Phd Student
> CREATIS <http://www.creatis.insa-lyon.fr> Tel:+33472438918
> 7 Av Jean Capelle
> 69621 Villeurbanne Cedex
> France
> Personal page <http://www.creatis.insa-lyon.fr/%7Eprieto>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
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-- 
Juan Carlos Prieto
Phd Student
CREATIS <http://www.creatis.insa-lyon.fr> Tel:+33472438918
7 Av Jean Capelle
69621 Villeurbanne Cedex
France
Personal page <http://www.creatis.insa-lyon.fr/%7Eprieto>
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