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=0x) Line 854 +
0xb bytesC++
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 bytesC++
osg25-osgViewerd.dll!osgViewer::ViewerBase::renderingTraversals() Line 651
+ 0x15 bytesC++
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
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