This is slightly modified from the subsurface.pov example provided in POV-Ray
3.7 Beta 32.

Here are the major changes from the original:

1. The shape of the candle has been changed, to resemble a candle that is nearly
spent: it is hollowed out, and its wall has been burned out on one side.

2. We have two candles: two identical copies.

3. A yellowish point light source has been placed in one of the candles, where
the flame would be. The original scene light has been dimmed.

4. Subsurface coefficients have been tweaked on the floor, for artistic reasons
(controlling the brightness of the floor).

The result is a candle that glows from within, more so where bright light hits
thinner walls of wax. The shape of the lit candle casts a shadow, with direct
light hitting the marble tiles, where you can see the scattering (note that the
shadow itself is sharp, from a point light source, as can be seen on the
rightmost tile at the bottom).

I've not fine-tuned nor optimized the scene: it took over 45 mins to render,
mostly because of the bright light source (?), and more complicated scene
geometry. The light is also slightly misplaced, but I wanted to show the
lighting effects more than I wanted practical realism.

Observations:
1. normals at a near-perpendicular angle to the camera ray produce considerably
dimmed exit rays, likely a consequence of IOR and diffusion.
2. There's a glitch of a few blue pixels in the inner part of the bright candle,
which could be put down to errors in the blob evaluation, rather than the SSLT
algorithm.

If it's good enough, I'd be happy for this to be included in standard
distrubition, if someone wants to optimize it to render faster.

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