support TrailInterval on bullets too

OpenRA.Mods.RA/Effects/Bullet.cs

@@ -28,7 +28,8 @@ namespace OpenRA.Mods.RA.Effects
 		public readonly int Arm = 0;
 		public readonly bool Shadow = false;
 		public readonly bool Proximity = false;
-		public readonly float Angle = 0;
+		public readonly float Angle = 0;
+		public readonly int TrailInterval = 2;
 
 		public IEffect Create(ProjectileArgs args) { return new Bullet( this, args ); }
 	}
@@ -81,7 +82,9 @@ namespace OpenRA.Mods.RA.Effects
 			return (int)(rawFacing < 128 
 				? rawFacing - scale * attitude 
 				: rawFacing + scale * attitude);
-		}
+		}
+
+		int ticksToNextSmoke;
 
 		public void Tick( World world )
 		{
@@ -99,10 +102,14 @@ namespace OpenRA.Mods.RA.Effects
 
 				var highPos = (Info.High || Info.Angle > 0)
 					? (pos - new float2(0, GetAltitude()))
-					: pos;
-
-				world.AddFrameEndTask(w => w.Add(
-					new Smoke(w, highPos.ToInt2(), Info.Trail)));
+					: pos;
+
+				if (--ticksToNextSmoke < 0)
+				{
+					world.AddFrameEndTask(w => w.Add(
+						new Smoke(w, highPos.ToInt2(), Info.Trail)));
+					ticksToNextSmoke = Info.TrailInterval;
+				}
 			}
 
 			if (!Info.High)		// check for hitting a wall

OpenRA.Mods.RA/SmokeTrailWhenDamaged.cs

@@ -16,7 +16,7 @@ namespace OpenRA.Mods.RA
 	class SmokeTrailWhenDamagedInfo : ITraitInfo
 	{
 		public readonly int[] Offset = { 0, 0 };
-		public readonly int Interval = 1;
+		public readonly int Interval = 3;
 
 		public object Create(ActorInitializer init) { return new SmokeTrailWhenDamaged(init.self, this); }
 	}