Add basic distance check to shockwave hit test

Before checking if the entity hitbox intersects the shockwave shell, we
do a basic check that the entity is close enough to be hit, considering
its radius.

This fixes the unlimited vertical range problem, since the distance is
measured in 3D.

CHANGELOG.md

@@ -95,6 +95,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Minimap icons are now displayed in both map modes
 - Server now denies any running trades when a user exits to the character selection screen.
 - Sfx volume changes now also change the ambient sounds volume
+- Staff fire shockwave ability no longer has an unlimited vertical range
 
 ## [0.9.0] - 2021-03-20
 

common/systems/src/shockwave.rs

@@ -164,6 +164,7 @@ impl<'a> System<'a> for Sys {
                 // Check if it is a hit
                 let hit = entity != target
                     && !health_b.is_dead
+                    && (pos_b.0 - pos.0).magnitude() < frame_end_dist + rad_b
                     // Collision shapes
                     && {
                         // TODO: write code to collide rect with the arc strip so that we can do