camera->setViewport(0, 0, textureWH, textureWH);
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f , 0.0f));
camera->setViewport(0, 0, textureWH, textureWH);
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f , 0.0f));