3delight 上关于ptex的讨论,3delight的开发者最后说ptex的内存表现并不比普通的贴图差,不知道是不是因为3delight不支持而故意说的
http://www.3delight.com/en/modules/PunBB/viewtopic.php?id=1742
Ptex are not more efficient in memory footprint that any normal texture map, as far as I know.
-- aghiles