[Concept] Flatness 3d

computation of distance from shape tops to considered plan

This measure is based on LeastSquarePlan3d measure results.

It computes, given a shape and associated plan 3d approximation, signed distance to estimated plan from each top of shape. An illustration of these computation is given in 2d case, please see [Concept] Flatness 2d.

Estimated plan can be computed using a simple parametric estimation of shape tops or can be computed using a robust estimation technic. This behavior is ruled by measure parameter, see ipsdk::imaproc::attr::RobustEstimationConfig.

For more information on plan 3d estimation please refer to LeastSquarePlan3d.