In article <8F8EF73D6seed7@204.213.191.228>, ing### [at] homenl (ingo) 
wrote:

> Could you use the object pattern here and use it as a function?

The isosurface uses the gradient of the function in it's calculations, 
the object pattern returns one of 2 values, so it basically has an 
infinite gradient. This causes the isosurface algorithm problems, it 
can't easily find the surface and you end up with a bunch of artifacts.
The same problem will occur with other patterns like checker and with 
color_maps with sharp changes in color.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
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