"Ronald L. Parker" wrote:
> 
> On Sat, 24 Apr 1999 16:22:54 -0400, Carl Bartels
> <cab### [at] bravo436chemmcgillca> wrote:
> 
> >I was just playing with media and stuff and figured I'd try the
> >following scene, but got an error in the warp due to the rotation and
> >ended up having to move the warp around by hand (sin's and cos's).  Is
> >there a good reason why warps (particularly black_hole warps) can't work
> >the way I was trying?
> 
> The main reason is that, in general, a warp IS a transformation of a
> very specific sort.  Applying a transformation to a transformation
> doesn't always make sense.  However, since it is a transformation,
> you know it will always be applied in order with all the other
> transformations, so you can do something like this:
> 
> 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 }
  }
}

Just my musing,
	Mike Andrews.

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