[osg-users] Cannot stop rendering slave camera

[Etienne de Sarrieu]

Hi,

Due to performance consumption, I am trying to disable rendering of a slave camera, but it seems impossible. The camera is _pov_camera, and is defined as below :


Code:
void MySensor::initialize()
{
   Sensor::initialize();
   
   // Master camera depth texture
   _input_depth = new osg::Texture2D();
   _input_depth->setTextureSize(_w, _h);
   _input_depth->setInternalFormat(GL_DEPTH_COMPONENT24);
   _input_depth->setSourceFormat(GL_DEPTH_COMPONENT);
   _input_depth->setSourceType(GL_FLOAT);
   _input_depth->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
   _input_depth->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
   _view->getCamera()->attach(osg::Camera::DEPTH_BUFFER, _input_depth);
   
   // Point of view depth texture
   _pov_depth = new osg::Texture2D();
   _pov_depth->setTextureSize(_w, _h);
   _pov_depth->setInternalFormat(GL_DEPTH_COMPONENT24);
   _pov_depth->setSourceFormat(GL_DEPTH_COMPONENT);
   _pov_depth->setSourceType(GL_FLOAT);
   _pov_depth->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
   _pov_depth->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
   
   // Point of view camera
   _pov_camera = new osg::Camera();
   _pov_camera->setViewport(0., 0., _w, _h);
   _pov_camera->setRenderOrder(osg::Camera::PRE_RENDER);
   _pov_camera->setClearColor(Color(1., 0., 0., 1.));
   _pov_camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   _pov_camera->setCullMask(Sensor::EXT);
   _pov_camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
   _pov_camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
   _pov_camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
   _pov_camera->attach(osg::Camera::DEPTH_BUFFER, _pov_depth);
   _pov_camera->setGraphicsContext(_view->getCamera()->getGraphicsContext());
   //_was_on = false;_autor=false;
   _view->addSlave(_pov_camera, true);
   
   _pov_camera->getOrCreateStateSet()->setAttributeAndModes(new osg::CullFace(osg::CullFace::FRONT));

(...)
}




The _pov_camera is used to compute shadows on a map. But it consumes much resources from CPU whereas I only compute shadows from time to time.

I tried to remove slave camera after using it :

Code:

		   int result = _view->findSlaveIndexForCamera(_pov_camera);
		   if (result < _view->getNumSlaves())
		   {
			   _view->removeSlave(result);
		   }
		   static_cast<osgViewer::Renderer*>(_pov_camera->getRenderer())->setDone(true);




After using it but it does not change anything (whereas if I do not add the slave camera at the beginning performances are OK...). Why removing slave camera does not permit to roll back completely on adding it?
Do you know a way to disable my _pov_camera?

Thank you!

Cheers,
Etienne

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