In article <38bed613@news.povray.org>, "Mick Hazelgrove" 
<mha### [at] mindaswinternetcouk> wrote:

> Can anyone give me a formula for a vertical isosurface cone shape?

Try something like:
function {sqrt(sqr(x) + sqr(z)) - abs(y)}
threshold 0

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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