Irrlicht Engine

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// load irr scene
	smgr->loadScene( "media/stage1.irr" );
	scene::ISceneNode* startloc = smgr->getSceneNodeFromName( "StartLocation" );
	core::vector3df startlocvec = startloc->getAbsolutePosition();
	startlocvec.Y += 80;
	camera->setPosition( startlocvec );
	scene::IParticleSystemSceneNode* windup = static_cast<IParticleSystemSceneNode*>(smgr->getSceneNodeFromName( "WindUp" ));

	// Create a meta triangle selector to hold several triangle selectors.
    scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();

	// find all meshes
	core::array<scene::ISceneNode*> nodes;
    smgr->getSceneNodesFromType(scene::ESNT_ANY, nodes);

    for (u32 i=0; i < nodes.size(); ++i)
    {
		scene::ISceneNode* node = nodes[i];
		scene::ITriangleSelector* selector = 0;

		switch(node->getType())
		{
		case scene::ESNT_CUBE:
		case scene::ESNT_ANIMATED_MESH:
			// Because the selector won't animate with the mesh,
			// and is only being used for camera collision, we'll just use an approximate
			// bounding box instead of ((scene::IAnimatedMeshSceneNode*)node)->getMesh(0)
			selector = smgr->createTriangleSelectorFromBoundingBox(node);
			break;

		case scene::ESNT_MESH:
		case scene::ESNT_SPHERE: // Derived from IMeshSceneNode
			selector = smgr->createTriangleSelector(((scene::IMeshSceneNode*)node)->getMesh(), node);
			break;

		case scene::ESNT_TERRAIN:
			selector = smgr->createTerrainTriangleSelector((scene::ITerrainSceneNode*)node);
			break;

		case scene::ESNT_OCT_TREE:
			selector = smgr->createOctTreeTriangleSelector(((scene::IMeshSceneNode*)node)->getMesh(), node);
			break;
		default:
			// Don't create a selector for this node type
			break;
		}

		if(selector)
		{
			// Add it to the meta selector, which will take a reference to it
			meta->addTriangleSelector(selector);
			// And drop my reference to it, so that the meta selector owns it.
			selector->drop();
		}
    }