Hi Dietmar Funck
Thank you very much for your reply. Do you mean, the first viewer.frame() is
used for initialization that why nothing is rendered in the first frame ?.
Best regards,
Phummipat
On Wed, Feb 16, 2011 at 2:48 PM, Dietmar Funck <
dietmar.fu...@student.hpi.uni-potsdam.de> wrote:
> Hi,
> I noticed the problem with first call of viewer.frame() too. This is
> happens. because meanwhile the viewer initialization - which is called by
> first call of viewer.frame() - a call to glGetString (SceneView::init() ->
> osg::isGLExtensionSupported(_renderInfo.getState()->getContextID(),""); )
> triggers exiting to the caller of viewer.frame().
> Actually nothing is rendered in the first frame.
>
> The following code works for me to get an offscreen viewer. I don't know if
> you can leave sth. out from the traits.
>
> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
> osg::GraphicsContext::Traits();
> traits->x = viewport->x(); // viewport of camera
> traits->y = viewport->y();
> traits->width = viewport->width();
> traits->height = viewport->height();
> traits->windowDecoration = false;
> traits->doubleBuffer = false;
> traits->sharedContext = NULL;
> traits->pbuffer = true;
>
> osg::GraphicsContext *graphicsContext =
> osg::GraphicsContext::createGraphicsContext(traits.get());
>
> if(!graphicsContext) {
> osg::notify(osg::NOTICE) << "Failed to create pbuffer, failing back
> to normal graphics window." << std::endl;
>
> traits->pbuffer = false;
> graphicsContext =
> osg::GraphicsContext::createGraphicsContext(traits.get());
> }
>
> viewer->getCamera()->setGraphicsContext(graphicsContext);
>
>
> I found another problem:
> I would like to change the textures used for render to texture. However the
> framebufferobject used by osg is only initialized once and cannot be updated
> - at least with an approach like in the osgmultiplerendertargets example.
> Camera::detach() has no effect.
>
> Best Regards
> Dietmar Funck
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=36728#36728
>
>
>
>
>
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