I have problem with "Too many nested refracting objects."

after changine an L-system plant (my underwater plant CSS-3 entry) into an 
media instead off plain pigment{...} solid object.


  Remove bounds........On 
  Split unions.........Off

  (btw - what exacly does this option do, maybe it can help? or increase 
speed of rendering in cost off bigger memory usage for more bounding 
boxes?)

  Bounding boxes.......On   Bounding threshold: 3
  Light Buffer.........On
  Vista Buffer.........On   Draw Vista Buffer....Off

Scene Statistics
  Finite objects:       217742  
  Infinite objects:          1
  Light sources:             1
  Total:                217744

Rendering Error: Too many nested refracting objects.  (<<<<<<<<<<<<)

  Total Time:    0 hours  1 minutes 39 seconds (99 seconds)


How can I get rid of this problem?

Main object, after unrolling recurency is something like

union {
  union {
    union { cylinder{} cylinder{} cylinder{} }
    union { cylinder{} cylinder{} cylinder{} }
    union { cylinder{} cylinder{} cylinder{} }
  }
  ...

_Each_  cylinder have own texture settings (different colors)
like :

  pigment { rgbf 1 }
  interior { media { emission <..,..,..> } }
  

-- 
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics

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