Hi,<br>I am new vtk, and I did not found enough sources, I try to understand from codes<br>I work on face images I need to find the surface normals of this face images The images are includes x,y,z coordinates.The file format is<br>x1 x2 x3.......xn<br>y1 y2 y3......yn<br>z1 z2 z3........zn<br><br>I need to read this file and I must find the surface normals of images for my project. I found a code that read the .txt file and return a vtkPolyData. After this step what can I do to find surface normals???<br><br>Thanks<br>Kiv<br><br><br><p> 
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