I build a level in WED and use ent_type(NULL) to check what kind of map it's build ... ent_type always returns 3 (Mesh based BSP map). I am at a loss to understand how the engine builds a ABT map.

The manual states "The A7 engine automatically uses an ABT for levels that don't contain a precalculated BSP tree" ... I assume this means that we don't need to build a map in WED and rather create it on the fly just like in earthball.c example??

Incidentally earthball.c also returns 3 as ent_type. Can someone shed some light on this?