Hi Jansen,
Could you try OSG-2.2 or even better 2.3.x or SVN version of the OSG,
there have been improvements to the handling of fallbacks so there
chance that the problem you have might be addressed.
Robert.
On Mon, Feb 4, 2008 at 1:58 AM, Jansen Yu <[EMAIL PROTECTED]> wrote:
>
>
>
>
> Hi OSG folks,
>
>
>
> I have a problem on saving screen image. I'm using osg2.0 compositeViewer
> and a slave camera to catch screen shot generated by master camera, through
> a snap image post draw call back deriving from osg::Camera::DrawCallback, in
> a wxWidgets environment. It works well for FBO. Unfortunately it doesn't
> work (black empty image) for some graphic card not supporting FBO. When I
> change to osg::Camera::PIXEL_BUFFER or osg::Camera::PIXEL_BUFFER_RTT with
> slave camera's setRenderTargetImplementation it causes a crash at
> Renderstage::draw because callingContext is NULL. Here is the callback:
>
>
>
> osg25-osgd.dll!osg::GraphicsContext::releaseContext() Line 527
> + 0x3 bytes C++
>
> > osg25-osgUtild.dll!osgUtil::RenderStage::draw(osg::RenderInfo &
> renderInfo={...}, osgUtil::RenderLeaf * & previous=0x00000000) Line 854 +
> 0xb bytes C++
>
> osg25-osgUtild.dll!osgUtil::SceneView::draw() Line 1454 + 0x34
> bytes C++
>
> osg25-osgViewerd.dll!osgViewer::Renderer::cull_draw() Line 506
> + 0xf bytes C++
>
>
> osg25-osgViewerd.dll!osgViewer::Renderer::operator()(osg::GraphicsContext *
> context=0x0952c5d0) Line 569 C++
>
> osg25-osgd.dll!osg::GraphicsContext::runOperations() Line 671 +
> 0x33 bytes C++
>
>
> osg25-osgViewerd.dll!osgViewer::ViewerBase::renderingTraversals() Line 651
> + 0x15 bytes C++
>
> osg25-osgViewerd.dll!osgViewer::ViewerBase::frame(double
> simulationTime=1.7976931348623157e+308) Line 578 + 0xf bytes C++
>
>
>
> By checking the mail list I found the bug was reported before but I cannot
> find the solution. Any progress or advice on this problem?
>
>
>
> Also I found Robert ever suggest to use a fallback mechanism for PBUFEER,
> how it works? Anyone has ever successfully tried that?
>
>
>
> Thanks,
>
>
>
> Jansen
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
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