hello, as u see bellow, i can normalize when using both data vertices data -0.525731112119133606 0.0 0.850650808352039932 0.525731112119133606 0.0 0.850650808352039932 -0.525731112119133606 0.0 -0.850650808352039932 0.525731112119133606 0.0 -0.850650808352039932 0.0 0.850650808352039932 0.525731112119133606 0.0 0.850650808352039932 -0.525731112119133606 0.0 -0.850650808352039932 0.525731112119133606 0.0 -0.850650808352039932 -0.525731112119133606 0.850650808352039932 0.525731112119133606 0.0 -0.850650808352039932 0.525731112119133606 0.0 0.850650808352039932 -0.525731112119133606 0.0 -0.850650808352039932 -0.525731112119133606 0.0 surfaces data 1 4 0 4 9 0 4 9 5 8 5 4 1 8 4 1 10 8 10 3 8 8 3 5 3 2 5 3 7 2 3 10 7 10 6 7 6 11 7 6 0 11 6 1 0 10 1 6 11 0 9 2 11 9 5 2 9 11 2 7 My QUESTION is, can i normalize without using the surfaces data. What i mean that u replaced the surfaces data with the vertices data. For example: first row of surfaces data is 1 4 0. So, i just replace 1 =0.525731112119133606 0.0 0.850650808352039932 4 =0.0 0.850650808352039932 0.525731112119133606 0 =-0.525731112119133606 0.0 0.850650808352039932 any suggestion to do this?