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

[Aashish Chaudhary]

Not reading the entire email but ..based on my understanding you can
directly use viewPlaneNormal()

Thanks,

On Sun, Jan 20, 2013 at 11:29 PM, SHAMSUDHEEN TK <shamsutk87 at gmail.com>wrote:

> 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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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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