SceneLoaderSuccessCallback typedef
        SceneLoaderSuccessCallback =
     void Function(List<AbstractMesh>  meshes, List<IParticleSystem>  particleSystems, List<Skeleton>  skeletons, List<AnimationGroup>  animationGroups, List<TransformNode>  transformNodes, List<Geometry>  geometries, List<Light>  lights)
    
    
    
Implementation
typedef SceneLoaderSuccessCallback = void Function(List<AbstractMesh> meshes, List<IParticleSystem> particleSystems, List<Skeleton> skeletons, List<AnimationGroup> animationGroups, List<TransformNode> transformNodes, List<Geometry> geometries, List<Light> lights);