this example tweaks the min_dist
in the fragment shader and picks a shorter tweenTime
to produce a sparse field of ephemeral circles that glow briefly before fading
an iteration on the block regl-animate-circles which in turn forks the block ReGL circle animation example from @ajdant
commit history and related experiments here
https://cdnjs.cloudflare.com/ajax/libs/regl/1.3.0/regl.min.js
https://d3js.org/d3.v4.min.js