Implemented in fge::ObjAnimation, fge::ObjButton, fge::Object, fge::ObjLight, fge::ObjRenderMap, fge::ObjShaderChain, fge::ObjShape, fge::ObjSprite, fge::ObjSpriteBatches, fge::ObjSpriteCluster, fge::ObjSwitch, fge::ObjText, fge::ObjTileMap, and fge::ObjWindow.