Reference/Release Notes/2.68/Smoke Simulation
Blender 2.68: Fire & Smoke Simulation
High resolution for emitters
When high resolution is enabled, the emitters now take the finer grid into account. Before the emitters where showing the blocks of the normal resolution grid even when the additional high resolution was enabled. This allows to use a lower base resolution for the simulation in many cases.
Subframes for emitters
For fast moving emitters, an option to use subframes was added. This allows for a smooth flow of smoke or fire even for emitters moving very fast. Beforehand, one puff of smoke was emitted for every frame, resulting in disjoint spots of smoke.