I'm trying to render a medical data set in a movie. I am using the MRI code at
http://ozviz.wasp.uwa.edu.au/~pbourke/modelling_rendering/df3/ as a starting
point. However, my .df3 file is slightly larger (250 by 250 by 350
1-byte-values). I'm rendering on a 16 GB quad-core workstation with the beta
3.7.0.beta.25, because I need to make use of the multicore architecture.

The beta gives me an "out-of-memory", while 3.6 works without problems.
Strangely enough, in the strace, I cannot find a failing mmap. The reason for
the failure seems to be a large intervals count: lowering it to 30 from 100
solves my problem. Here's the code cooked down just to show the problem:

camera {
   location 0
   look_at z }
#declare theinterior = interior {
   media {
      intervals 100
      density {
                density_file df3 "maus.df3" } } }
box {
   <0,0,0>, <1,1,1>
   interior { theinterior }
   hollow }

Fatal error in renderer: Out of memory.
Render failed

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