I'm sorry to put forward such silly (?) questions here in the advanced.users
group, but I'm believe you are the only one to answer me, because it this is
not a bug, then it it a weird feature. I think .. :/

This works fine:

isosurface {
        function {
                ((2*x^2+y^2+z^2-1)^3 - (0.1)*x^2*z^3-y^2*z^3 ) //+
(0.00*Noize)

        }
        threshold 0
        accuracy 0.00001
        sign 1
        max_gradient 20
        max_trace 2
        contained_by { sphere { 0, 7 } }
        pigment {
                color Grey
        }
}

However, when i remove the // before the Noize addidtion, nothing appears
when I render! MegaPov speeds up, and leaves me with the background.

Anyone?

TIA

5k.

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Simen Kvaal wrote in message <38a72c50@news.povray.org>...
>I'm sorry to put forward such silly (?) questions here in the
advanced.users
>group, but I'm believe you are the only one to answer me, because it this
is
>not a bug, then it it a weird feature. I think .. :/
>


I had a similar thing a while ago, I was using a pigment function and adding
it
to x^8+y^8+z^8. Often the entire isosurface (or large parts) of it
disappeared.
I never actually solved the problem, but I got the isosurface to appear
more-or-less
intact by moving it around and scaling the pigment by small amounts.

Gail
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Gail Shaw wrote:

> I had a similar thing a while ago, I was using a pigment function and adding
> it to x^8+y^8+z^8. Often the entire isosurface (or large parts) of it
> disappeared. I never actually solved the problem, but I got the isosurface to
> appear
> more-or-less
> intact by moving it around and scaling the pigment by small amounts.

This drove me crazy too, until I discovered that having a proper max_gradient
value fixed the problem. Now I have a first run without max_gradient, I look at
the statistics and use the max_gradient value shown there.

G.

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Gilles Tran wrote in message <38A7FA84.F36E9B00@inapg.inra.fr>...
>This drove me crazy too, until I discovered that having a proper
max_gradient
>value fixed the problem. Now I have a first run without max_gradient, I
look at
>the statistics and use the max_gradient value shown there.



Ah thanks. I'll remember that next time.

Gail
*******************************************************************
* gsh### [at] monotixcoza              * ERROR: COFFEE.COM not found  *
* http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
*******************************************************************
* Definition of an upgrade: Take the old bugs out, put new ones in*
*******************************************************************

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