here it is how my patch works with uv mapping

FIRST IMAGE

  /* two lights, camera and background */

  #declare Object1=box {
    -1.8 1.8 uv_mapping
    rotate <0,45,0>
    rotate <0,0,45>
    rotate <0,20,0>
    no_shadow
    uv_mapping
    texture{pigment{checker color rgb 0 color rgb 1}finish{specular 1}scale 1/8}
  }

  This is possible in MegaPOV - render time 42 secs

SECOND IMAGE

  /* previous scene */
  #declare Object2={
    Object1
    deform { twist 8 }
  }

  This is result of my patch.
  Great ! UV mapping works fine! I'm proud of it :-)
  This is possible to achive such shape with isosurface
  but without mapping, I think. This is possible to achive
  such mapping with mesh.
  Render time is reasonable - 6 mins
  Rendered on PII 233 WinNT4 128 MB with full of tasks.

THIRD IMAGE

  /* previous scene */
  #declare Object3={
    Object2
    rotate <0,0,90>
  }

  still 6 min but ...

FOURTH IMAGE

  /* previous scene */
  #declare Object3={
    Object2
    deform { twist 16 }
  }

  Ough! I can't even imagine this shape.
  Complicated math available for all!
  But, what I expected, render time is 4 hours.
  Let's optimise something ....

btw: to read something what I'm talking about please read p.u.p from last moth

ABX

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Preview of image 'step2.jpg'

Preview of image 'step3.jpg'

Preview of image 'step4.jpg'