bug fix Child Intval

src/cells/Intval.cpp

@@ -92,8 +92,8 @@ int Intval::Children() const { return 2; }
 
 Point Intval::Child(int i) const {
     switch(i) {
-        case 0:return (1.0 / 4.0) * (z(0) + z(1));
-        case 1:return (3.0 / 4.0) * (z(0) + z(1));
+        case 0:return (3.0 * z(0) + z(1)) / 4.0;
+        case 1:return (z(0) + 3.0 * z(1)) / 4.0;
     }
     Exit("Not Implemented");
 }