Gaussian Curvature
 

Hello,
I need help in measuring Guassian curvature, I have geometry and I need measuring Gaussian curvature I can measure the mean curvature by this expression
uTx+vTy+wTz
where
test(u)*(u-nx)
test(v)*(v-ny)
test(w)*(w-nz)
also the two principle curvature K1, K2 by the two expressions

Please I need help as soon as possible