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#   shell
#   
#   Scene     Sea shell on blue background
#   Author    Eric Haines
#   Message   Shell is created using Pickover's  generation method
#             (see "IEEE CG&A" November 1989). This thing tends to
#             bring ray tracers to their knees:lots of overlapping
#             primitives, many quite tiny. Its meant as a study of
#             a realistic yet pathological database
#
#   Comments  This model is now in "chain" format. I think cluster
#             packing method does not support chains. So stay with 
#             grid packing, it's better anyway. Since spheres are
#             "pathologically tiny", use DOUBLE mode, rather than
#             fiddling with epsilon.
#
#   Objects   320 spheres
#   Precision DOUBLE
#   Memory    58K -> 149K
#   Time      640x480 sample 16, demiurge: 4 min  19 sec
#   Time      128x128 sample 1, darkstar:
#             4 min 18 sec, grid auto (6:7:7) size 7, ver 5.38
#                   53 sec, cluster 8 
#             1 min 44 sec, grid auto (6:7:7) size 7, ver 5.41
#                   46 sec, cluster 8 
#                   32 sec, auto grid (6:7:7) size 7, ver 5.42
#                   39 sec, cluster 8 
#                   35 sec, auto grid (6:7:7) size 7, ver 5.44
#
#   STANDARD PROCEDURAL DATABASES
#   by Eric Haines, 3D/Eye, Inc, Version 3.6, as of 4/3/95
#   
#   Beautiful  
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