On 6-12-2014 19:48, Alain wrote:
> Le 14-12-06 08:25, Le_Forgeron a écrit :
>> warp ? toroidal
>>
>> http://wiki.povray.org/content/Reference:Warp
>>
>>
>
> Not what was asked.
> This will wrap a pattern around a torus.

Yes, but used as a density pattern, it has the interesting effect of 
showing swirling matter through the torus. Not my initial image in 
p.b.i. because I added a turbulence warp.

>
> The question is about a pattern returning 1 at the major radius of a
> torus and dropping to zero at minor radius. Similar to spherical,
> cylindrical and planar.
>
> Curently, there is no "toric" pattern. It can be done using a function
> as a pattern based on the torus equation.

I need to test this. It came to my mind too.

Thomas

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