[Ves] Getting Angle or XYZ Points of a Rendered 3D Object

[Pat Marion]

Please re-read my previous email.  I think my suggestion to get the camera
view directory will be helpful.

Pat

On Mon, Jan 21, 2013 at 7:09 AM, SHAMSUDHEEN TK <shamsutk87 at gmail.com>wrote:

> oh.. okay thank you very much for the answer.
>
> Let me clarify my question in detail.
>
> Let take an example, I have a TeaPort.. Each portions of the TeaPort
> representing separate views.. let say front-view , bottom-view, side-view ,
> front -right-view, front-left-view etc...
>
> My aim is to display the corresponding views name in a Label while user
> rotating the 3D TeaPort object.
>
> So my logic should be like this, first i will identify all the angles or
> xyz points which is corresponding to the each separate views. example:
> 30-40 angle will be  front-view, 60-70 will be front -right-view such on.
>
> When the current 3D object angles meet 30-40  degree while rotating , we
> can easily know the TeaPort view is front-view.When angles meet 60-70 ,it
> should be front -right-view.
>
> I hope you cleared my concept,
>
> Any good suggestions from your side to help me..
>
> Thanks again for your answer.
>
>
>
> On Sun, Jan 20, 2013 at 5:41 AM, Pat Marion <pat.marion at kitware.com>wrote:
>
>> Hi Shamsudheen,
>>
>> I'm not sure exactly what you're trying to get with angle, do you mean
>> the camera angle?  When you use gestures to rotate, you are actually moving
>> the camera, not the object.  I assume you are using vesKiwiViewerApp in
>> your application?  This class, in the VES master branch, makes access to
>> the renderer and camera protected function calls, so you can derive a new
>> class and do your work there.  So to get the view direction, for example,
>> you would call:
>>
>> vesCamera::Ptr camera = app->camera();
>> vesVector3f viewDirection = camera->focalPoint() - camera->position();
>>
>> To get the XYZ points, again that depends on how your application is
>> using VES.  You can get the XYZ points from a vtkPolyData object after you
>> read data, or you can get the points from the vesGeometryData object which
>> holds the rendering vertex arrays.
>>
>> You might try following some introductory VTK tutorials to become more
>> familiar with using the VTK library:
>>
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx
>>
>> Pat
>>
>> On Sun, Jan 20, 2013 at 5:17 PM, SHAMSUDHEEN TK <shamsutk87 at gmail.com>wrote:
>>
>>> Shamsudheen
>>
>>
>>
>> I'm really newbie with *VTK* and *VES*.
>
> I have successfully built the *VES/Kiwi* and have rendered one 3D obj
> file in my iPad application.
>
> Great, I can rotate and zoom the object now using Gestures.
>
> *Now I would like to get the Angle or XYZ Points of a Rendered 3D Object
> to identify the object position.*
>
> Is it possible? if yes, please share the details.
>
> Thanks,
>
> Shamsudheen
>
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