[vtk-developers] Scissor in vtkOpenGLCamera

[Antonella Cascitelli]

To summarize I need to render a small part of the whole scene as Roi Region
Of Interest (ROI) in order to render a rectangle around an object without
altering its geometry and prospective.
Il 29 ott 2015 8:23 PM, "Aashish Chaudhary" <aashish.chaudhary at kitware.com>
ha scritto:

> On Thu, Oct 29, 2015 at 3:15 PM, Antonella Cascitelli <
> lenlen1982 at gmail.com> wrote:
>
>> Thank you, but I'm trying to render only a smaller part of image instead
>> the whole image to save computational time.
>>
>
> If that's the case, why not have a smaller viewport? I may be missing
> something here.
>
>
>> I have just modified vtkOpenGLCamera the call to glScissor with my custom
>> arguments and It works... is it possible to expose a patch that allow a
>> custom glScissor setting? What I have done is a dirty workaround, which
>> would be the right class to add this new public method?
>>
>
> Hmm..not sure if that would be easy unless we just add an API to the
> vtkOpenGLCamera. I would be okay with the later option but wondering what
> others has to say on this.
>
> - Aashish
>
>
>>
>> 2015-10-29 19:52 GMT+01:00 Aashish Chaudhary <
>> aashish.chaudhary at kitware.com>:
>>
>>> You can achieve this by creating two renderers and then for the second
>>> one just a smaller viewport (on top of the first one). I am assuming that
>>> you are showing two images / data at the same time.
>>>
>>> There is no API (as far as I know) to help you with this task.
>>>
>>> On Thu, Oct 29, 2015 at 2:45 PM, Antonella Cascitelli <
>>> lenlen1982 at gmail.com> wrote:
>>>
>>>> Hi,
>>>> is it possible set the glScissor in vtk?
>>>> i.e. in vtkOpenGLCamera:
>>>>
>>>> glViewport(lowerLeft[0], lowerLeft[1], usize, vsize);
>>>> glEnable(GL_SCISSOR_TEST);
>>>> glScissor(lowerLeft[0], lowerLeft[1], usize, vsize);
>>>>
>>>> so seems that the scissor area is always the same of the viewport.
>>>> I want to render only a small rectangle area in the viewport like using
>>>> scissor with opengl.
>>>>
>>>> Thanks
>>>>
>>>> Antonella
>>>>
>>>> _______________________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at
>>>> http://www.kitware.com/opensource/opensource.html
>>>>
>>>> Search the list archives at:
>>>> http://markmail.org/search/?q=vtk-developers
>>>>
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://public.kitware.com/mailman/listinfo/vtk-developers
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>>
>>>
>>>
>>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>>>   *
>>> *| http://www.kitware.com/company/team/chaudhary.html
>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>
>>
>>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20151029/e4ec0992/attachment.html>