seams there's a problem in camera setup,but you didn't give it...
There's plenty of entries in osg forum concerning RTT camera setup..
hope the further code help
Code:
setClearMask(GL_COLOR_BUFFER_BIT);
// setClearMask( GL_COLOR_BUFFER_BIT);
setClearColor(osg::Vec4(0.0f, 0, 0, 0.0f));
setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
// set the camera to render before the main camera.
setRenderOrder(osg::Camera::PRE_RENDER, 110);
// tell the camera to use OpenGL frame buffer object where supported.
setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
//setReadBuffer(osg::Camera::COLOR_BUFFER);
setProjectionResizePolicy(osg::Camera::FIXED);
setReferenceFrame(osg::Transform::ABSOLUTE_RF);
setViewMatrix(osg::Matrix::identity());
setImplicitBufferAttachmentMask(osg::Camera::IMPLICIT_COLOR_BUFFER_ATTACHMENT,
osg::Camera::IMPLICIT_COLOR_BUFFER_ATTACHMENT);
setAllowEventFocus(false);
setDrawBuffer(osg::Camera::COLOR_BUFFER0);
setViewMatrix(osg::Matrix::identity());
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=61816#61816
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