fix is_slope_walkable

src/gameplay_style.rs

@@ -341,7 +341,7 @@ impl WalkSettings{
 		let ny=normal.dot(up);
 		let h=normal.length().fix_1();
 		//remember this is a normal vector
-		ny.is_negative()&&h*self.surf_dot<ny
+		ny.is_positive()&&h*self.surf_dot<ny
 	}
 }