Return true if the cap intersects "cell", given that the cap does contain
any of the cell vertices (supplied in "vertices", an array of length 4).
Return true if this cap intersects any point of 'cell' excluding its
vertices (which are assumed to already have been checked).
Return true if the cap intersects "cell", given that the cap does contain any of the cell vertices (supplied in "vertices", an array of length 4). Return true if this cap intersects any point of 'cell' excluding its vertices (which are assumed to already have been checked).