# 3.9.8: Principal States Transformation 🔷

With the

**“Principal States Transformation”**-component one can define a tensor via first and second principal vectors**“Vec1”**and**“Vec2”**and get the components for a given direction**“DirX”**. This allows to e.g. calculate the bending moments or in-plane forces of a shell for a section perpendicular to**“DirX”**.**“N”**specifies the direction normal of a plane onto which**“Vec1”**and**“Vec2”**get projected before performing the transformation.

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