Visibility from a viewpoint is characterized as the subzero level set of the viscosity solution of the local obstacle problem min{u-g, (x-x*)·∇u}=0.
Agarwal and Micha Sharir, Ray shooting amidst convex polyhedra and polyhedral terrains in three dimensions, SIAM J
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A Partial Differential Equation Obstacle Problem for the Level Set Approach to Visibility
Visibility from a viewpoint is characterized as the subzero level set of the viscosity solution of the local obstacle problem min{u-g, (x-x*)·∇u}=0.