On 5 Mar 2002 10:14:11 -0500, Ron Parker <ron### [at] povrayorg> wrote:
> That technique has a tendency to make fat contour lines where the slope is 
> gentle.

With contignous* trace you can sample heighfield from two sides and produce
(white with ambient 1) spheres at every intersection. High resolution of this
sampling can produce smooth image. Just hide heigh_field itself.

*) saying "contignous trace" I mean trace from start point to end point with
restart from intersection point after each intersection

ABX

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