# Displacement Calculation

For the displacement calculation the polygons resulting from these cuts is used

  • 1D – the element cut of the plane is expanded to the enclosing box
  • 2D – the element cut line is expanded to the top and bottom surfaces
  • 3D – the polygon on the cut plane

The displacement and rotations are based on a displacement plane described for each component by

A least-squares fit across the points gives a set of equations (one for each of directions)

Then the displacement are

And rotations are about and come from the curvature terms in the displacement equation in the direction

The twisting rotation is calculated from