Convert contrails to world coords.

OpenRA.Game/CPos.cs

@@ -21,6 +21,7 @@ namespace OpenRA
 		public readonly int X, Y;
 
 		public CPos(int x, int y) { X = x; Y = y; }
+		public CPos(WPos a) { X = a.X / 1024; Y = a.Y / 1024; }
 
 		public static readonly CPos Zero = new CPos(0, 0);
 

OpenRA.Game/Traits/Render/RenderSimple.cs

@@ -16,7 +16,7 @@ using OpenRA.FileFormats;
 
 namespace OpenRA.Traits
 {
-	public class RenderSimpleInfo : ITraitInfo
+	public class RenderSimpleInfo : ITraitInfo, LocalCoordinatesModelInfo
 	{
 		[Desc("Defaults to the actor name.")]
 		public readonly string Image = null;

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -216,6 +216,7 @@ namespace OpenRA.Traits
 		WVec LocalToWorld(WVec vec);
 		WRot QuantizeOrientation(Actor self, WRot orientation);
 	}
+	public interface LocalCoordinatesModelInfo {}
 
 	public interface ITargetable
 	{