On Thu, 15 May 2003 20:05:22 +0200, Christoph Hormann <chr### [at] gmxde>
wrote:
>#declare fn_rotated=
>  function { 
>    fn_original(
>      x*cos(Angle)+y*sin(Angle), 
>      -x*sin(Angle)+y*cos(Angle), z
>    ) 
>  }
>
>therefore twisting would be something like:
>
>#declare fn_twisted=
>  function { 
>    fn_original(
>      x*cos(AngleFactor*z)+y*sin(AngleFactor*z), 
>      -x*sin(AngleFactor*z)+y*cos(AngleFactor*z), z
>    ) 
>  }

writing both as:

#declare fn_rotated=
  function(x,y,z,Angle) { 
    ...
  }

#declare fn_twisted=
  function(x,y,z,AngleFactor) { 
    ...
  }

gives variable deforming along axis but calculations will be probably slower.

ABX

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