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

tijude wrote:

Ptex are really efficient in memory footprint with big texture map and nice to implement in a pipeline. SO I agree with simon on this.

Ptex are not more efficient in memory footprint that any normal texture map, as far as I know.

  -- aghiles