I decided to see how tortuously I could twist it, and changed the parametric to
a trianguloid trefoil.

Even after increasing the number of patches to subdivide the surface better,
there's still a bit of "shredding" evident.

72 x 36 = 2596 patches.

Apparently my radiosity block has been judged - and found lacking.

radiosity {
    adc_bailout 0.005
    always_sample off
    count 150
    error_bound 0.25
    gray_threshold 0.2
    low_error_factor 0.25
    minimum_reuse 0.01
    maximum_reuse 0.2
    nearest_count 8
    pretrace_start 0.08
    pretrace_end   0.04
    recursion_limit 5
    //brightness 1
   }  // end radiosity block

There shall surely be more to come - any suggestions on improvements, further
experiments, and crafting a better scene by those skilled in the art are most
welcome as always.

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