diff --git a/python/project_tool.hpp b/python/project_tool.hpp
index 6f8c1d7..c185c44 100644
--- a/python/project_tool.hpp
+++ b/python/project_tool.hpp
@@ -5,14 +5,14 @@ template<typename T, typename ProdType>
 static T project_tool(T *vertex_value, T *u, T *u0)
 {
   T ret0 = 0;
-  for (int i = 0; i < 8; i++)
+  for (unsigned int i = 0; i < 8; i++)
     {
-      int c[3] = { i & 1, (i>>1)&1, (i>>2)&1 };
+      unsigned int c[3] = { i & 1, (i>>1)&1, (i>>2)&1 };
       int epsilon[3];
       T ret = 0;
       
       for (int q = 0; q < 3; q++)
-        epsilon[q] = (2*c[q]-1);
+        epsilon[q] = 2*c[q]-1;
 
       for (int q = 0; q < ProdType::numProducts; q++)
         ret += ProdType::product(u, u0, epsilon, q);
@@ -27,7 +27,8 @@ static T project_tool(T *vertex_value, T *u, T *u0)
 template<typename T>
 static inline T get_u0(const T& u0, int epsilon)
 {
-  return (epsilon > 0) ? u0 : (1-u0);
+  return (1-epsilon)/2 + epsilon*u0;
+//  return (epsilon > 0) ? u0 : (1-u0);
 }
 
 template<typename T>
@@ -39,7 +40,7 @@ struct ProductTerm0
   {
     T a = 1;
     
-    for (int r = 0; r < 3; r++)
+    for (unsigned int r = 0; r < 3; r++)
       a *= get_u0(u0[r], epsilon[r]);
     return a;
   }
@@ -54,14 +55,14 @@ struct ProductTerm1
   static T product(T *u, T *u0, int *epsilon, int q)
   {
     T a = 1;
-    double G[3];
+    T G[3];
     
-    for (int r = 0; r < 3; r++)
+    for (unsigned int r = 0; r < 3; r++)
       {
         G[r] = get_u0(u0[r], epsilon[r]);
       }
 
-    double F[3] = { G[1]*G[2], G[0]*G[2], G[0]*G[1] };
+    T F[3] = { G[1]*G[2], G[0]*G[2], G[0]*G[1] };
 
     return F[q] * u[q] * epsilon[q];
   }
@@ -75,14 +76,14 @@ struct ProductTerm2
   static inline T product(T *u, T *u0, int *epsilon, int q)
   {
     T a = 1;
-    double G[3];
+    T G[3];
     
-    for (int r = 0; r < 3; r++)
+    for (unsigned int r = 0; r < 3; r++)
       {
         G[r] = get_u0(u0[r], epsilon[r]);
       }
 
-    double F[3] = { epsilon[1]*epsilon[2]*u[1]*u[2], epsilon[0]*epsilon[2]*u[0]*u[2], epsilon[0]*epsilon[1]*u[0]*u[1] };    
+    T F[3] = { epsilon[1]*epsilon[2]*u[1]*u[2], epsilon[0]*epsilon[2]*u[0]*u[2], epsilon[0]*epsilon[1]*u[0]*u[1] };    
 
     return F[q] * G[q];
   }