this could be solved by using a pre-interpolated light texture and
mapping light levels to coordinates on that
+ there seems to be a bug with adding/removing obstacles...again
+
also: how could block light affect entity lighting?
+ maybe get the interpolated light level at the entity's center and use
+ that as the light power for the directional lighting shader and use a
+ direction that's fixed relative to the camera?
gravity
maybe like light levels? should also store a direction with it in
that case. also, global gravity may be a world option.
+ no, per-block gravity vector is most probably too expensive.
+ better have the chunks store a few point masses (maybe blocks that
+ emit gravitation?) and calculate from that
block attributes
maybe the chunk loader should keep an index of interesting, if not
all chunks by position, possibly base-relative
+ profiling indicates that this is not neccessary atm. maybe it will
+ when some more action is in the world
+
transparency (blocks and entities)
transparent blocks because awesome