On 30-9-2017 8:24, clipka wrote:
> Am 30.09.2017 um 05:16 schrieb Bald Eagle:
> 
>> If you take a look over at
>> http://www.econym.demon.co.uk/isotut/builtin1.htm
>> at
>> http://www.econym.demon.co.uk/isotut/std007.jpg
>> you'll see that Mike Williams' render of this function shows the same odd sphere
>> at the center.
> 
> Judging from those images, my guess would be that the sphere constitutes
> an intentional hack, to prevent the gradient from exploding at the
> coordinate origin.
> 

That sounds like a Black Hole singularity to me ;-)

-- 
Thomas

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