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

[SHAMSUDHEEN TK]

Thanks again,

This will be my final question :)

As per your answer, I have just done a quick view in vesKiwiViewerApp.h
before going to create a subclass.

I have found one method in *vesKiwiViewerApp.h* which will directly return
the *cameraPosition* as *vesVector3f*
*
*
So I have called *vesVector3f angle = self->renderer.app->cameraPosition();*

Is it make sense ? Or I want to call *vesVector3f angle = self->renderer.app
->cameraFocalPoint**()* - *self->renderer.app->cameraPosition(); *
*
*
What is* *cameraFocalPoint do.. How it effect on the position? is it effect
the position while I zoom the object ?

Please guide me which will be the better option ?

On Sun, Jan 20, 2013 at 6:18 PM, Pat Marion <pat.marion at kitware.com> wrote:

> Yes, that's exactly right.  I find it is helpful to organize your code in
> a derived, c++ app class.  Use objective-c just for the app's UI, use c++
> for the logic, since VES and VTK are c++ libraries.  You could add a public
> method that returns a string,  std::string getViewDirectionLabel() and that
> would return "Front View" or "Side View", etc.  The string label could be
> computed on-the-fly from the camera view directory.  Then your objective-c
> UI code can ask the app class for the view direction label.
>
> Pat
>
>
> On Mon, Jan 21, 2013 at 10:13 AM, SHAMSUDHEEN TK <shamsutk87 at gmail.com>wrote:
>
>> okay,thanks again.
>>
>> Do you mean to create a new class which inherits the vesKiwiViewerApp.h
>>  and retrieve the vesCamera and vesVector3f objects ?
>>
>> Sorry , if the question does not make any sense.
>>
>>
>>
>> On Sun, Jan 20, 2013 at 5:59 PM, Pat Marion <pat.marion at kitware.com>wrote:
>>
>>> Typo in previous email... I meant camera view direction.
>>>
>>> Pat
>>>
>>>
>>> On Mon, Jan 21, 2013 at 9:58 AM, Pat Marion <pat.marion at kitware.com>wrote:
>>>
>>>> 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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