[PERFORMANCE] even faster get_turf

[Erik]

Giving this a friendly bump as it's been confirmed by Lummox to work just fine.

get_step(Ref,0) is a really innovative idea; you're right that it's calling an internal routine to get the turf. The downside is, it's also doing a call to LocXYZ() and then XYZLoc() even if there's no direction given, so it's unpacking and then re-packing the coordinates for no reason. (That's two divisions and two multiplications.) However it definitely is stable and intended behavior, so you can rely on this to work. A sanity check for dir 0 would speed this up in that case, but obviously it would just be dead weight on all other get_step() calls.

At the moment there are no other quick shortcuts to the internal GetLocTurf() function.