Ευστοχία και Διασπορά

Accuracy and Dispersion


Standard Deviation Diagram

Every shot you take is dispersed randomly around the center of your aiming reticle, i.e. you will not necessarily hit exactly where you aimed. The actual dispersion amount is based on a Gaussian (normal) distribution curve and depends on your gun and the turret it is mounted to.
Gun Accuracy

The accuracy value for a gun is given in meters at a range of 100m. The value describes 2 standard deviations σ from the center of your aim. In other words, for a gun with 0.32m effective accuracy at 100m, 95.45% of all shots will land within 0.32m of the center of your aim at that distance. Dispersion amount increases linearly with distance, i.e. 0.32m effective accuracy at 100m translates to 0.64m at 200m and 1.28m at 400m
Aiming Circle

The aiming circle is 1.5 times bigger and describes an area of 3 standard deviations σ from the aim point. That means for 0.32m effective accuracy at 100m your aiming circle's outer diameter is 0.96m at 100m, or 3.84m at 400m.

Based on a purely normal distribution that would mean that a very small percentage of your shots would fall outside of the aiming circle. However, in game dispersion is effectively limited to 3 standard deviations, i.e. the size of the aiming circle, and no shots can fall outside of that area.
Client vs Server

When you fire a shot, your shell trajectory is first calculated based on the data the client has. It is later updated with the data confirmed by the server. If the difference was big, then you may see shell tracers leave your barrel at an angle or change flight path mid-trajectory.
It is unclear whether only the aiming point or also the dispersion of the trajectory around this center point is corrected based on server data. At least in v0.7.1, if you watch a replay, you can notice that each time you play it, your trajectory will be slightly different. This indicates that either dispersion is not synchronized between client and server, or that it is during a battle but that data is missing in the replay files. In any case, currently replays cannot be used to find out where your shot went exactly.