diff --git a/src/main.c b/src/main.c
index 772579c..567ac97 100644
--- a/src/main.c
+++ b/src/main.c
@@ -35,7 +35,7 @@ int main( void )
 
 	glewInit(); 
 
-	points = generate_surface(256);
+	points = generate_surface(16);
 
 	if( !( shader = create_shader() ) )
 		goto error_shader;
diff --git a/src/surface.c b/src/surface.c
index 8b44cb0..d10016c 100644
--- a/src/surface.c
+++ b/src/surface.c
@@ -21,18 +21,29 @@ void mobius(float *d_surface, int i, int j, int grid_size)
 
 void toro(float *d_surface, int i, int j, int grid_size)
 {
-	float u = (2.0*M_PI) * ((float)i/grid_size );
-	float v = (2.0*M_PI) * ((float)j/grid_size );
+	float u = (2*M_PI) * ((float)i/grid_size );
+	float v = (2*M_PI) * ((float)j/grid_size );
 
 	d_surface[0] = (1 + 0.5*cos(v))*cos(u);
 	d_surface[1] = (1 + 0.5*cos(v))*sin(u);
 	d_surface[2] = 0.5*sin(v);
 }
 
+void klein(float *d_surface, int i, int j, int grid_size)
+{
+	float u = (2*M_PI) * ((float)i/grid_size );
+	float v = (2*M_PI) * ((float)j/grid_size );
+
+	d_surface[0] = (0.5*cos(v) + 0.5) * cos(u);
+	d_surface[1] = (0.5*cos(v) + 0.5) * sin(u);
+	d_surface[2] = sin(v) * cos(u/2);
+    //d_surface[2] = sin(v)*sin(u/2);
+}
+
 float * generate_surface(int grid_size)
 {
 	long size = grid_size*grid_size*2*3*3;
-	function_t f = toro;
+	function_t f = klein;
 	float * d_surface;
 	int k=0;