Dihedral Angle

Stable Discrete Bending by Analytic Eigensystem and Adaptive Orthotropic Geometric Stiffness
In this paper, we address two limitations of dihedral angle based discrete bending (DAB) models, i.e. the indefiniteness of their energy Hessian and their vulnerability to geometry degeneracies.
Zhendong Wang, Yin Yang, Huamin Wang
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Stable Discrete Bending by Analytic Eigensystem and Adaptive Orthotropic Geometric Stiffness