[ItsFirefly]

I think your first question is actually supposed to be: what if a single (not two) entity is modified from multiple chunks?

All external effects that can happen to an entity are written to an atomic integer that tracks healing points, damage points and effects like poison and stunning. Angeldust currently runs on CPUs supporting atomic integers everywhere, so this doesn't have to fall back to mutexes. On platforms/compilers without atomic integers I have a software-fallback that uses mutexes for this, but currently it's not used anywhere.

Most world state is compiled into flat byte arrays each tick to save processing time, since many clients can be in the same area at once. The server bundles these world state byte arrays for chunks near a client together and sends them over the network. The client interpolates from these updates. What you see on screen lags behind subtly to make sure animations are smooth. I think this happens in most online games since you don't really want to extrapolate.

Angeldust's game pace and mechanics are designed so that the interpolation doesn't affect your aiming accuracy or game experience too much.

[dreamingincode]

Thank you again for all the explanations!