Computer-Aided Design publishes papers mostly on the practical side. Papers in this journal have more to do with implementation-level graphics than with computational geometry. The paper under review is no exception. I have to confess that this is a clearly written paper and has some nice (but by no means impressive) pictures. But the fact remains that it tells the story of a naive, hidden-line elimination algorithm which is not unlike Loutrel’s now 16-year-old algorithm [1].

The algorithm basically classifies the edges and the faces in a given scene into contoural and noncontoural. It relies on the assumption that it will be used to display large objects with many noncontoural edges.

I couldn’t understand the omission of a standard reference on hidden surface elimination, namely, the celebrated paper by Sutherland et al. [2]. Nor could I explain the lack of references to recent important work done by (among others) Franklin [3], and Sechrest and Greenberg [4]. There are better places to learn about graphics and computational geometry than in Computer-Aided Design.