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A sliver is a tetrahedon whose four vertices lie close to a plane and whose orthogonal projection to that plane is a convex quadrilateral with no short edge. Slivers are notoriously common in 3-dimensional Delaunay triangulations even for well-spaced point sets. We show that, if the Delaunay triangulation has the ratio property introduced in Miller et al. 1995, then there is an assignment of weights so the weighted Delaunay traingulation contains no slivers. We also give an algorithm to compute such a weight assignment.
Cheng et al. (Fri,) studied this question.