[vtkusers] translucent trouble with external OpenGL render window

[Aashish Chaudhary]

On Thu, Mar 10, 2016 at 6:15 PM, Mike Guttman <mguttman at yahoo.com> wrote:

> BAM!  That was it.
>
> I added a default vtkExternalLight and turned on lights in the GL world
> and it works fine now.
>
> Perhaps in 6.2 it created a default light.
>
> In initializeGL(), set up default light:
>   vtkNew<vtkExternalLight> light;
>   renderer->AddExternalLight(light.GetPointer());
>
> Then, to turn on the lighting:
>   glEnable(GL_LIGHTING);
>   glEnable(GL_LIGHT0);
>
> And turn it off:
>   glDisable(GL_LIGHTING);
>
>
Yup, you will need that since in the ExternalRender we do this:

if (light)

      {

      if (!status)

        {

        // This is the case when we have a VTK light in the scene but no

        // external light corresponding to that index in the context.

        // In this case, we remove the VTK light as well.

        light->SwitchOff();

        this->RemoveLight(light);


        // No need to go forward

        continue;

        }

      }


Thanks,

Aashish




> Thank you!!
>
> -Mike
>
>
>
>
> On Mar 10, 2016, at 1:36 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
> Hi Mike,
>
> One of the thing we do in external framework is get rid of default lights.
> So you would have to add lights to VTK yourself. Sankhesh might have more
> information on it (cc'd)
>
> - aashish
>
> On Thu, Mar 10, 2016 at 1:31 PM, Ken Martin <ken.martin at kitware.com>
> wrote:
>
> What does it look like in 7.0 when you set your opacity to 1.0 instead of
> 0.7?
>
> On Thu, Mar 10, 2016 at 1:17 PM, mguttman via vtkusers <vtkusers at vtk.org>
> wrote:
>
> Hi, Just wanted to attach my nabble presence to this post, since it seemed
> anonymous on nabble and not visible on markmail. I really hope there is a
> migration path for me from 6.2/OpenGL1. A simple surface rendering of
> polygon data in an vtkExternalOpenGLRenderWindow became much worse going
> from 6.2/OpenGL1 to 6.3/OpenGL2 (see the two pictures). I've spent an
> embarrassing amount of time on this, when I should be writing, and I'm not
> sure what to try next. Many thanks in advance, Mike
> http://vtk.1045678.n5.nabble.com/attachment/5737114/1/vtk6.2-opengl1.jpg
> http://vtk.1045678.n5.nabble.com/attachment/5737114/0/vtk6.3-opengl2-externwidget.jpg
> ------------------------------
> View this message in context: Re: translucent trouble with external
> OpenGL render window
> <http://vtk.1045678.n5.nabble.com/translucent-trouble-with-external-OpenGL-render-window-tp5737114p5737157.html>
> Sent from the VTK - Users mailing list archive
> <http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html> at Nabble.com.
>
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>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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