In article <38722fe8@news.povray.org>, Nieminen Juha 
<war### [at] punarastascstutfi> wrote:

>   It didn't help.

Hmm, I don't know what's wrong. I tried a few things for myself, and 
while it crashes when noise3d is used with no parameters, those 
functions render with no trouble...but with no result. Also, these 
doesn't work:
#declare f4 = function {x^2+y^2+z^2}
isosurface {function {f4(x, y, z)-1}}

#declare f4 = function {sqrt(x^2+y^2+z^2)}
isosurface {function {f4(x, y, z)^2-1}}

but these do:
#declare f4 = function {x^2+y^2+z^2}
isosurface {function {sqrt(f4(x, y, z))-1}}

#declare f4 = function {sqrt(x^2+y^2+z^2)}
isosurface {function {f4(x, y, z)-1}}

However, if you force method 1 solving, everything seems to work fine. 
Just add the line "method 1" to the isosurface. Of course, this slows 
things down.
Specifying a larger max_gradient(I tried 5) seems to work too. I would 
guess maybe it is having trouble calculating the gradient of those 
declared functions.

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

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