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

[Xabi Riobe]

Thanks for the quick answer!
Yes i understood the reason for the check, the message in vtkDebugMacro is
clear, but what i would like to know is the reason for the extensions
failing in that case; probably something missing in
vtkWin32OpenGLRenderWindow::CreateOffScreenDC but i don't know what.

As for the anti-aliasing, it is not working, probably also because of
CreateOffScreenDC...

2015-11-30 15:54 GMT+01:00 David Lonie <david.lonie at kitware.com>:

> 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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