You could use a pbuffer instead of a window. See the osgscreencapture
example's pbuffer options.
jp
On 16/04/11 00:46, Matthias Asselborn wrote:
Hi,
i want to render a loaded scene into an image.
i dont want to see any viewer windows.
I have tried to realize it with osg::Viewer, but after the call
viewer->frame a viewer window poped up.
Now ive tried it with osgUtils::SceneViewer
but after the draw call - the program crashes
whats wrong?
Code:
osg::ref_ptr<osg::Image> shot = new osg::Image();
shot->allocateImage( 800, 600, 1, GL_RGB, GL_UNSIGNED_BYTE );
osg::ref_ptr<osg::Node> subgraph = m_pNode.get();
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
osg::ref_ptr<osg::Camera> oldcamera = m_pViewer->getCamera();
//Copy the settings from sceneView-camera to get exactly the view
//the user sees at the moment:
camera->setClearColor( oldcamera->getClearColor() );
camera->setClearMask( oldcamera->getClearMask() );
camera->setColorMask( oldcamera->getColorMask() );
camera->setTransformOrder( oldcamera->getTransformOrder() );
camera->setProjectionMatrix( oldcamera->getProjectionMatrix() );
camera->setViewMatrix( oldcamera->getViewMatrix() );
// set view
camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
// set viewport
camera->setViewport( 0, 0, 800, 600 );
//set the camera to render before after the main camera.
camera->setRenderOrder( osg::Camera::POST_RENDER );
// tell the camera to use OpenGL frame buffer object where supported.
camera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
camera->attach( osg::Camera::COLOR_BUFFER, shot.get() );
// add subgraph to render
camera->addChild( subgraph.get() );
//camera->addChild(TheDocument->GetHUD().get() );
//Need to mage it part of the scene :
m_pViewer->setSceneData( camera.get() );
//Make it frame:
m_pViewer->update();
m_pViewer->cull();
m_pViewer->draw();
// in draw call the software crashes
osgDB::writeImageFile( *shot, "C:/tools/test.bmp" );
The crash appers in
RenderStage.cpp Line 1146 - trunk
Code:
if (_graphicsContext.valid()&& _graphicsContext != callingContext)
{
// show we release the context so that others can use it?? will do so
right
// now as an experiment.
callingContext->releaseContext();
Thank you!
Cheers,
Matthias
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=38516#38516
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