private void createLights(OBJGroup.SubObject obj)
        {
            var lightPositions = getLightPositions(obj.GetPositions(importer).Select(v => v.dx()).ToArray());

            foreach (var pos in lightPositions)
            {
                var l = renderer.CreatePointLight();
                l.ShadowsEnabled = false;
                l.LightPosition  = pos;
                l.LightRadius    = 5f;
                l.LightIntensity = 1;
                lights.Add(l);
            }
        }
        private void createMeshPart(OBJGroup.SubObject subObject)
        {
            var part = interpreter.CreateMeshPart(subObject);

            mesh.GetCoreData().Parts.Add(part);
        }