Some parts of some buildings are pathable.

- not handling WEAP/FIX yet; that's special-case logic.

OpenRa.Game/BuildingInfluenceMap.cs

@@ -20,14 +20,14 @@ namespace OpenRa.Game
 
 		void AddInfluence(Actor a)
 		{
-			foreach (var t in Footprint.Tiles(a.unitInfo.Name, a.Location))
+			foreach (var t in Footprint.UnpathableTiles(a.unitInfo.Name, a.Location))
 				if (IsValid(t))
 					influence[t.X, t.Y] = a;
 		}
 
 		void RemoveInfluence(Actor a)
 		{
-			foreach (var t in Footprint.Tiles(a.unitInfo.Name, a.Location))
+			foreach (var t in Footprint.UnpathableTiles(a.unitInfo.Name, a.Location))
 				if (IsValid(t))
 					influence[t.X, t.Y] = null;
 		}

OpenRa.Game/GameRules/Footprint.cs

@@ -53,5 +53,23 @@ namespace OpenRa.Game.GameRules
 				++j;
 			}
 		}
+
+		public static IEnumerable<int2> UnpathableTiles( string name, int2 position )
+		{
+			var footprint = Rules.Footprint.GetFootprint( name );
+			var j = 0;
+
+			foreach( var row in footprint )
+			{
+				var i = 0;
+				foreach( var c in row )
+				{
+					if( c == 'x' )
+						yield return position + new int2( i, j );
+					++i;
+				}
+				++j;
+			}
+		}
 	}
 }

footprint.txt

@@ -6,10 +6,11 @@
 
 x			: ftur sbag brik fenc gun pbox hbox silo gap kenn *
 _ x			: tsla agun
-xx xx xx	: powr dome barr tent domf hpad atek
-xxx xxx xxx	: fact facf syrf syrd weap weaf spen spef apwr stek
+xx xx ==	: powr dome barr tent domf hpad atek
+xxx xxx ===	: fact facf weap weaf apwr stek
+xxx xxx xxx : syrf syrd spen spef
 xx			: sam mslo
-_x_ xxx xxx xxx : proc
+_x_ xxx x== === : proc
 xxx xxx			: afld
 _x_ xxx _x_		: fix
-__ xx           : iron
+xx xx           : iron