"Droj" <803### [at] drojde> wrote:

> When you mentioned to use the function f_r (x, y, z) - although I do not have a
> clue what it does (there is no comment in functions.inc)

You need to check the wiki entry under functions.inc

f_r(x,y,z): When used alone, the R function gives a surface that consists of all
the points that are a specific distance (threshold value) from the origin,

So basically you're just comparing your surface to a spherical shell.

At least you were able to work something out and get a decent result.
Isosurfaces can certainly be tricky, especially since we don't have vector
functions and certain inbuilt functions that other software packages pull from
libraries.

Chris R does everything with isosurfaces - maybe he can focus his highly trained
mind on it.

- BW

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