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what so long ?
the rendering quality is outstanding, you have a decent quality in your productions, and i mean not only the rendering output, the interface style is very nice, too bad you took your previous version offline good work!

I have played around and added some 'features'.

It can draw a low-res distance map to a texture and then run again using this as input.

The display is colour coded by this info; the white pixels were discarded in an early pass, and red in were in the previous pass but not this pass.

I do the early passes with very few iterations, and crank the iterations up for the final pass.  In principle, as passes accumulate, you might get away with fewer on the final pass?

I have not found any significant speedup (nor slow-down) on my wimpy ATI mobile card, sadly.  If you save and open the file locally, you can edit it and change the parameters; easily add or change the distance map steps.

It now displays a useful frame-rate graph on the bottom of the window.  I find this more informative than a simple average number, but chrome can show a really useful FPS counter (enabled in about://flags)

I'd be most curious to know what kind of FPS this runs on your computer, what your computer spec is, and if changing the intermediate distance map texture parameters helps?

Is it possible to get the shader out so it's an external file or not as a string so it an be easily edited?