From 76f5c099edf69e186e7701a50d29c868bd85ba49 Mon Sep 17 00:00:00 2001
From: Joonas Rikkonen <poe.regalis@gmail.com>
Date: Tue, 13 Feb 2018 13:50:41 +0200
Subject: [PATCH] Particles that rotate towards the movement direction use
 sub-relative movement when inside the sub (weld/cut particles don't face the
 movement direction of the submarine anymore).

---
 Barotrauma/BarotraumaClient/Source/Particles/Particle.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Barotrauma/BarotraumaClient/Source/Particles/Particle.cs b/Barotrauma/BarotraumaClient/Source/Particles/Particle.cs
index 3a18e142c..04f14f075 100644
--- a/Barotrauma/BarotraumaClient/Source/Particles/Particle.cs
+++ b/Barotrauma/BarotraumaClient/Source/Particles/Particle.cs
@@ -168,7 +168,12 @@ namespace Barotrauma.Particles
             {
                 if (velocityChange != Vector2.Zero || angularVelocity != 0.0f)
                 {
-                    rotation = MathUtils.VectorToAngle(new Vector2(velocity.X, -velocity.Y));
+                    Vector2 relativeVel = velocity;
+                    if (currentHull?.Submarine != null)
+                    {
+                        relativeVel -= ConvertUnits.ToDisplayUnits(currentHull.Submarine.Velocity);
+                    }
+                    rotation = MathUtils.VectorToAngle(new Vector2(relativeVel.X, -relativeVel.Y));
                 }
             }
             else