In 3D FEM pre procedure, it is not easy job. <*L8kNykK
3D modelling need digital photography knowledge, the main issue is how to deal with the contour plots and slice. :0J;^@
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3D modelling, you can take a look ANALYSIS. Especially in geotech, PLAXIS 3D is better, but it still has some bugs. Af;$}P
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Good luck!