FYI: PlotlyJS.jl turns out to be quite capable with respect to animated graphics, displayed from a running program. Kudos to @sglyon!
addtraces! and deletetraces! did not work. Perhaps I was doing it wrong. But react! was just the ticket.
Code at GitHub - PetrKryslUCSD/FinEtoolsFlexBeams.jl: Finite Element tools in Julia: large-displacement response of 3D flexible frame structures
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