Improve/replace signed distance field calculations

[CarsonBurke]

From the little research I've done, it appears that SDF (signed distance fields) can be replaced/synergized with more efficient algorithms or optimizations, such as the following:

• JFA (jump flooding; SDF approximation)
  or
• optimizations for SDF shown here (coinciding video)

potentially useful paper

Please note I have very little understanding of SDF or the aforementioned optimizations, and some of the things I said or linked to could be unhelpful or incorrect.