The Back-face Culling is a technic that allow us to ignore the facets that are on the back (so not visible). In order to use it, we choose a direction (clock wise or counter clock wise). A facet visible on its back must not be drawn because it represents the inside of an object (if the direction choosen is correct).
It allow us for example to be able to ignore the facets that correspond to the inside of a crate.

Implementation in Daídalos:

The Back-face Culling has been recently implemented in Daídalos, and it allow us to have a performance gain of 15% or so in comparison with a version without Back-face Culling.
At the moment this version is not avalable in download, you will have to wait a bit for the next version.