diff --git a/src/surface.c b/src/surface.c
index 04da2dc..7f2bed8 100644
--- a/src/surface.c
+++ b/src/surface.c
@@ -14,6 +14,24 @@
 #define CMPLX(a,b) (a+I*b)
 #endif
 
+const int dim = 6;
+
+int factorial(int n)
+{
+	if(n == 1)
+		return 1;
+	
+	return n * factorial(n - 1);
+}
+
+int numero_caras(int n)
+{	
+	if(n == 2)
+		return 1;
+
+	return (1 << (n - 3)) * factorial(n) / factorial(n - 2);
+}
+
 void riemman(float *d_surface, int * coords, int grid_size)
 {
 	complex double eq;
@@ -31,10 +49,8 @@ void riemman(float *d_surface, int * coords, int grid_size)
 
 void cube( float *d_surface, int * coord, int grid_size )
 {
-	unsigned char i;
-
-	for(int i=0; i<3; i++ )
-		d_surface[i]=(float)coord[i]/grid_size;
+	for(int i = 0; i < dim; i++ )
+		d_surface[i] = ((float)coord[i]/grid_size) - 0.5;
 }
 
 void mobius(float *d_surface, int * coord, int grid_size)
@@ -73,18 +89,17 @@ typedef void (*function_t)(float *, int *, int);
 
 float *generate_data_surface(int grid_size, unsigned char *s)
 {
-	unsigned int i, j, k, o, p, l, n, m;
-	long size, q=0;
+	unsigned int i, j, k, o, p, n;
+	long size, q = 0;
 	function_t f;
 	float *d_surface;
 
-	const int dim =3;
 	int cara[dim];
 
 	f =cube ;
-	*s = 3;
+	*s = 6;
 
-	size = grid_size * grid_size * 6 * (*s) * 6;
+	size = grid_size * grid_size * 6 * (*s) * numero_caras(dim);
 	d_surface = malloc((size + 1) * sizeof(float));
 	d_surface[0] = size;