On Thu, 31 May 2001 15:00:06 -0400, Chris Huff wrote:
>In article <3b15ecda@news.povray.org>,
> "Gail Shaw" <gsh### [at] monotixcoza> wrote:
>
>> Now do a black hole <grin>
>
>Those *are* black holes...he's using the equations for a point source, a 
>singularity. Spherical masses with a radius larger than 0 don't have 
>this falloff...unfortunately, I don't know the equation for the 
>gravitational force of a spherical body.

It's the integral of the one for a point source over the volume of the sphere,
of course.  Not that that's useful. :)

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbt 1}hollow interior{media{emission T}}finish{
reflection.1}}#end Z(-x-x.2y)Z(-x-x.4x)camera{location z*-10rotate x*90}

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