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I wasn't satisfied with pure TIA so did things differently in Jux (and called it Fibers, taking some ideas from a Ron Barnett UF coloring). First, I prefer a running average with a weight parameter (0 - 0.999), which avoids any possible precision issues and lets you adjust detail. Second, I use sin or cos instead of the plain angle, and add a frequency parameter. And some other variations. The results are usually smooth with any bailout over about 3, assuming correct interpolation (and when there are artifacts it tends to be in awkward rational formulas).

Mixing between this and potential or distance estimate also adds a lot more nice control of color.