I liked gk's test foil so much that I raised the max_trace_level to 15 and
set adaptive to 1 on all light sources. Then, I did a +a0.2 +AM2
+r4 -w1600 -h1200 trace. The trace took over a week on a 2.4 GHz P4 machine
with a Gig of RAM. I wish I had raised the gamma a little more to lessen
some of the speculars, but all in all, I'm pleased with the result. I had to
interrupt the trace twice, so I can't post reliable stats, but needless to
say max trace level 15 was hit, so I might try 20 the next time around.

Comments from the source:

//========================================================
// Foil Vase
//========================================================

//
// FoilVase object links:
// DOS text style:
//     http://www.freelocus.com/files/foilvase.zip (~18 K)
// UNIX text style:
//     http://www.freelocus.com/files/foilvase.tar.bz2 (~16 K)
//
// Texture image:
//     http://www.freelocus.com/images/uv_grid.jpg (~80K)
//
// Feel free to use and modify
//========================================================
// Made for Persistence of vision 3.5
//========================================================

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