[vtkusers] translucent trouble with external OpenGL render window

[Mike Guttman]

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);

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,Mikehttp://vtk.1045678.n5.nabble.com/attachment/5737114/1/vtk6.2-opengl1.jpghttp://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
Sent from the VTK - Users mailing list archive at Nabble.com.

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