[vtk-developers] OpenGLExtensions not loaded with OffscreenRendering and MultiSamples

David Lonie david.lonie at kitware.com
Mon Nov 30 09:54:14 EST 2015


On Mon, Nov 30, 2015 at 9:44 AM, Xabi Riobe <xabivtk at gmail.com> wrote:

> Thanks for any information about that.
>
> Xabi
>

I'm not sure why the OpenGL2 version was removed, and it's possible that
there are some bits after that check that should still be executed, so feel
free to modify this as needed.

The reason for the check is that the FBO-based offscreen rendering
implementation provided by vtkOpenGLRenderWindow does not support
multisampling, and trying to render offscreen with multisampling will not
anti-alias the result without that check.

So when MSAA is requested, the generic FBO method should fail so that the
platform-specific render windows can use their platform-specific offscreen
implementations (which do support MSAA).

Hope this helps,
Dave
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