On Mon, 26 Apr 1999 14:12:41 +0100, Michael Andrews wrote:
>
>
>"Ronald L. Parker" wrote:
>> plane {-z,0
>>   pigment {
>>     checker color rgb 1, color red 1
>>     rotate -z*360*clock
>>     warp { black_hole x, 2 strength 2 }
>>     rotate z*360*clock
>>   }
>> }
>
>Alternatively,
>
>plane {-z,0
>  pigment {
>    checker color rgb 1, color red 1
>    warp { black_hole vrotate(x, z*360*clock), 2 strength 2 }
>  }
>}

The difference is that while black_hole has a location parameter, the same 
cannot be said for every type of warp.  For example, how would you rotate
or translate a turbulence or repeat warp?

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