-float tile_check_cross(vector where);
-float tile_check_plus(vector where);
-float tile_check_star(vector where);
-var float tile_check(vector where);
+float tile_check_cross(entity this, vector where);
+float tile_check_plus(entity this, vector where);
+float tile_check_star(entity this, vector where);
+var float tile_check(entity this, vector where);