I half recall coming across something like this before. You need to lock it 
down, be it freeze it or cache it or something........ I think


Date: Mon, 14 Jul 2014 08:23:04 -0500
From: [email protected]
To: [email protected]
Subject: XSI hair and Random Generation


  

    
  
  
    Is there something about XSI's standard hair primitives (not ICE)
    that causes the hairs to be generated slightly differently each
      time a scene is opened? We're rendering with Redshift, but I'm
    thinking we saw something like this a few years ago with Mental Ray
    as well. Basically, on the farm, some machines will render their
    frame ranges with slightly different hair than any other machine.
    The only solution seems to be to render all the hair on a single
    machine, and to do so in a way that keeps the scene open (so in the
    case of Royal Render for instance, set the sequence maximum to be
    the full range you need).

    

    The rendered hair isn't 'bad' per se, it's just 'different' from
    surrounding frame ranges. The simplest description is that each
    machine seems to want to render the hair slightly differently. And I
    really wonder if it's not some bug with XSI hair.

    -- 

      Signature
      
       

      Tim Crowson

          Lead
            CG Artist

      Magnetic Dreams, Inc.

          2525
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