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In article <39c7daff$1@news.povray.org>, "Marc-Hendrik Bremer"
<Mar### [at] t-online de> wrote:
> I don't feel as good, asking for isosurface-functions in .newusers,
> but this could be that trivial that I do not dare to ask in one of
> the other groups.
In general, math questions should go to povray.advanced-users.
> I need a function which represents a cone (with one of the radii =0)
> in an isosurface. I tried to "generate" one using the cylinder
> function (x*x +z*z -r*r) and modifying the radius by y. That is
> probably the right way, but I don't know how to do it right.
> Everything I can get is a somewhat parabolic-shape. My math is
> already to rusty.
Sounds like you were using a non-0 value for the threshold...these give
double-ended cones for me:
function {sqrt(sqr(x) + sqr(z)) - abs(y)}
function {sqrt(sqr(x) + sqr(z) - sqr(y))}
But you must use a threshold of 0.
--
Christopher James Huff
Personal: chr### [at] mac com, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tag povray org, http://tag.povray.org/
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