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Richard Kline <rkl### [at] earthlink net> wrote:
> 1) If the contained_by shape is larger than the true surface for the
> given threshold value, the entire contained_by shape (either box or
> sphere) is rendered as part of the surface.
By default isosurfaces are solid objects, AFAIK every point where the
function evaluates to something greater than zero is considered to be
inside.
If you only care about the surface itself, you may want to use the
'open' keyword. Or use the negative of the function to invert inside
and outside.
> Since the Gravitational potential is a function of 1/r the function used
> is 1/sqrt(x*x+y*y+z*z)
This is the function for a singularity. It might cause problems with the root
solver, since it doesn't really have a maximum gradient.
In this case you might want to use the function for a hollow sphere with a
radius of R instead.
Thats is 1/r for r > R
1/R for r <= R
Lutz-Peter
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