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This function creates a grid for an interactive way to define the set of the points of view
grid_pov(mesh, expand = 1)
matrice matrix: matrix with the x,y,z coordinates of the points of view
object of class mesh3d
numeric: scale factor for the grid for the interactive 3D plot
Antonio Profico, Costantino Buzi, Marina Melchionna, Paolo Piras, Pasquale Raia, Alessio Veneziano