[vtkusers] Using vtkExternalOpenGLCamera

[Sankhesh Jhaveri]

Hi Elaine,

You shouldn’t have to set that flag for using the matrices set on the
external camera. Could you share some sample code that doesn’t work?

Thanks,
Sankhesh
​

On Thu, Jul 20, 2017 at 11:38 AM Elaine Jiang <elainejiang8 at gmail.com>
wrote:

> Hi Sankhesh,
>
> I've tried setting the camera and focal point parameters without using
> SetProjectionMatrix() and SetModelViewTransformMatrix(), and I've also
> tried just calling SetProjectionMatrix() and SetModelViewTransformMatrix()
> by themselves. Neither approach seemed to have an effect on the scene. I
> was looking through the documentation and was wondering if I need to use
> the function vtkCamera::vtkSetUseExplicitProjectionTransformMatrix(bool) to
> solve the problem?
>
> Thanks,
> Elaine
>
> On Thu, Jul 20, 2017 at 11:12 AM, Sankhesh Jhaveri <
> sankhesh.jhaveri at kitware.com> wrote:
>
>> Hi,
>>
>> Could you please provide more details on how you’re trying to set the
>> camera parameters?
>> The way the external camera works is that it ignores the camera position
>> and focal point parameters if the projection and model view matrices are
>> set explicitly using vtkExternalOpenGLCamera::SetProjectionMatrix() and
>> vtkExternalOpenGLCamera::SetModelViewTransformMatrix()
>>
>> Thanks,
>> Sankhesh
>> ​
>>
>> On Wed, Jul 19, 2017 at 9:59 AM elainejiang8 <elainejiang8 at gmail.com>
>> wrote:
>>
>>> Hi everyone!
>>>
>>> I'm building a program that uses the externalVTKWidget to volume render
>>> an
>>> object in an OpenGL context. Right now, I'm calling
>>>
>>> *ren->GetActiveCamera();
>>> *
>>>
>>> (where ren is a vtkExternalOpenGLRenderWindow instance) in my render
>>> function so I can control the position and focal point of the camera.
>>> However, I'm unable to get the camera to actually have any effect on the
>>> scene. The documentation for vtkExternalOpenGLCamera is rather slim, and
>>> I
>>> can't find any similar examples, so I am a bit stuck on this issue.
>>>
>>> Does anyone have any insight into how I could approach this problem?
>>> Thanks
>>> in advance!
>>>
>>> Elaine
>>>
>>>
>>>
>>> --
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>> --
>> Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
>> <http://www.kitware.com/> | (518) 881-4417
>> ​
>>
>
> --
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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