Modding Help Particle orientation

Hey there, I've been making a weapons mod for Starbound, and started working on a Raygun from Call of Duty Zombies, but I'm having an issue with the particles left behind by the projectile.

See, what I want is for those green particles to line up in the direction that the projectile is moving, but they kinda just rotate wherever they want. Is there a way to fix this?

rayguntrail.particle:

Code:

{
  "kind" : "rayguntrail",
  "definition" : {
    "type" : "animated",
    "animation" : "/animations/rayguntrail/rayguntrail.animation",
    "position" : [0, 0],
    "finalVelocity" : [0, 0],
    "approach" : [50, 50],
    "destructionAction" : "shrink",
    "destructionTime" : 0.85,
    "fade" : 1,
    "size" : 1,
    "layer" : "back",
    "timeToLive" : 0.45,
    "variance" : {
      "initialVelocity" : [2.0, 2.0],
      "rotation" : 180
    }
  }
}

I tried messing with "rotation" by setting it to zero, but that just made them orient parallel to the ground.

raygunblast.projectile:

Code:

{
  "projectileName": "raygunblast",
  "image": "raygunblast.png",
  "animationCycle": 0.4,
  "frameNumber": 4,
  "damageKindImage": "icon.png",
  "lightColor": [ 134, 255, 40 ],
  "pointLight": true,
  "actionOnReap": [
    {
      "action": "config",
      "file": "/projectiles/explosions/tacticalexplosions/raygunexplosion.config"
    }
  ],

  "statusEffects": [],
  "emitters": [ "rayguntrail" ],
  "flippable": true,
  "power": 1.0,
  "speed": 80.0,
  "acceleration": 0,
  "physics": "laser",
  "damageType": "NoDamage",
  "damageKind": "mann"
}

 

Anyone got anything? Still no solution found...