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#   hedgehog
#
#   Scene     Coral tree -- skeleton and smoothed body
#   Author    Andrei Sherstyuk
#   Features  Blobby lines, (true function)
#             Surface color and geometry blends
#   Comments  This is a derivative from "gentle.rat". First, the
#             model is rendered with hard surfaces (hedge), then
#             with soft surfaces (hog). Demonstrates the idea of
#             sceleton design. Model is somehow simpler than the
#             original "gentle.rat" - because I removed negative
#             lines - I can't make negative cylinders!. Rendered
#             with Lagrangian interpolation, one sample per line,
#             tolerance 0.001 (default). Run-time sampling (more
#             than twice faster than pre-condensing)
#
#   Objects   548 cylinders/lines
#   Precision DOUBLE
#   Memory    ???
#   Time      320x480 sample 16, demiurge:
#             hard:  9 min 12 sec, grid(9:6:11) size 9 void 63%
#             soft: 35 min 17 sec, grid(9:6:11) size 9 void 57%
#
#   Beautiful
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