Test the model by jtressle with improved normal map. http://r.sketchfab.com/link/4rqp/x07j7v9zi7g0/1/NAKkCBJYgDtL_tQkGZiVjQ/aHR0cHM6Ly9za2V0Y2hmYWIuY29tL21vZGVscy80YmE2YmU2ZGNmZjc0MjBhODBjOWZkNTM2MzZhYTc3Mj91dG1fc291cmNlPXRyaWdnZXJlZC1lbWFpbHMmdXRtX21lZGl1bT1lbWFpbCZ1dG1fY2FtcGFpZ249bW9kZWwtZG93bmxvYWRlZA