Remove obsolete IRenderAsTerrain.

This removes the technical limitation preventing
FrozenUnderFog on bridges.

OpenRA.Game/Graphics/WorldRenderer.cs

@@ -120,10 +120,6 @@ namespace OpenRA.Graphics
 			Game.Renderer.EnableScissor(bounds.Left, bounds.Top, bounds.Width, bounds.Height);
 
 			terrainRenderer.Draw(this, Game.viewport);
-			foreach (var a in world.traitDict.ActorsWithTraitMultiple<IRenderAsTerrain>(world))
-				foreach (var r in a.Trait.RenderAsTerrain(this, a.Actor))
-					r.Render(this);
-
 			Game.Renderer.Flush();
 
 			for (var i = 0; i < renderables.Count; i++)

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -192,7 +192,6 @@ namespace OpenRA.Traits
 	public interface IPostRender { void RenderAfterWorld(WorldRenderer wr, Actor self); }
 
 	public interface IPostRenderSelection { void RenderAfterWorld(WorldRenderer wr); }
-	public interface IRenderAsTerrain { IEnumerable<IRenderable> RenderAsTerrain(WorldRenderer wr, Actor self); }
 	public interface IBodyOrientation
 	{
 		WAngle CameraPitch { get; }

OpenRA.Mods.RA/Bridge.cs

@@ -67,7 +67,7 @@ namespace OpenRA.Mods.RA
 		}
 	}
 
-	class Bridge: IRenderAsTerrain, INotifyDamageStateChanged
+	class Bridge: IRender, INotifyDamageStateChanged
 	{
 		ushort template;
 		Dictionary<CPos, byte> footprint;
@@ -125,12 +125,12 @@ namespace OpenRA.Mods.RA
 		{
 			return footprint.Select(c => (IRenderable)(new SpriteRenderable(
 				wr.Theater.TileSprite(new TileReference<ushort, byte>(template, c.Value)),
-				c.Key.CenterPosition, WVec.Zero, 0, palette, 1f, true))).ToArray();
+				c.Key.CenterPosition, WVec.Zero, -512, palette, 1f, true))).ToArray();
 		}
 
 		bool initialized;
 		Dictionary<ushort, IRenderable[]> renderables;
-		public IEnumerable<IRenderable> RenderAsTerrain(WorldRenderer wr, Actor self)
+		public IEnumerable<IRenderable> Render(Actor self, WorldRenderer wr)
 		{
 			if (!initialized)
 			{