% Try this example
[X,Y] = meshgrid(1:.1:100,1:.1:100);
R = sin(Y/1) + eps;
Z = R;
[nx,ny,nz] = surfnorm(X,Y,Z);
b = reshape([nx ny nz], size(nx,1), size(nx,2),3);
b = ((b+1)./2).*255;
imshow(uint8(b));
-DRN
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