How’s this one:
using Plots
plotly() # for interactivity
x = [(i, j, k) for i in 0:0.1:1 for j in 0:0.1:1 for k in 0:0.1:1]; # [(0,0,0), (0,0,0.1), ... (0, 0.1, 0), (0, 0.1, 0.1), ... (1, 1, 1)]
plot(x; st=:scatter, color=[RGB(a...) for a in x], xguide="R", yguide="G", zguide="B", label=nothing)
