Params in the form the shader and atlas builder consume: grid and the
scalar knobs sanitized, the trail colour packed into gradient stops. Built
once in the constructor and patched in setParams, so render reads it
straight without re-sanitizing each frame.
Params in the form the shader and atlas builder consume: grid and the
scalar knobs sanitized, the trail colour packed into gradient stops. Built
once in the constructor and patched in
setParams, sorenderreads itstraight without re-sanitizing each frame.