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opm-simulators/opm/simulators/utils
Elyes Ahmed 4c5c4a4d4e Simple and Accurate Methods
For the simple we assume areas uniformly change with depth : A(z) = Area/cos(θ)
Weight approximating  1/cos(θ)
where dip-angle is computed from cell corner geometry via normal vector cross product, providing both dip angle and azimuth vector

For the accurate method we compute cross-section areas using shoelace formula: A(z) = sum_ij (xj*yj+1 − xj+1*yj)
Weight is then w = A(z)*∆zi
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