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This paper extends previous research in that sense that for orthogonalprojections of rigid smooth (true-3D) curves moving totally free it reduces thenumber of required traceable points to two only (the best results known so farto the author are 3 points from free motion and 2 for motion restricted torotation around a fixed direction and and 2 for motion restricted to influenceof a homogeneous force field). The method used is exploitation of informationon tangential projections. It discusses also possibility of simplification ofreconstruction of flat curves moving free for prospective projections.

Reconstruction of~3-D Rigid Smooth Curves Moving Free when Two Traceable Points Only are Available