Add support for vertex color in 3D regular grid

[raman-maker]

Meshes.jl/ext/grid/cartesian.jl

Line 84 in db4881f

error("not implemented")

using GLMakie, Meshes
l =Meshes.Point(0,0,1.6)
h =Meshes.Point(0.172,0.065,1.75)
dbb = RegularGrid(l, h, dims = (10, 10, 10))
viz(dbb, color=1:nelements(dbb), alpha=0.4, showsegments=true)

work fine while

viz(dbb, color=1:nvertices(dbb), alpha=0.4, showsegments=true)

gives

ERROR: not implemented
Stacktrace:
[1] error(s::String)
@ Base ./error.jl:35
[2] vizgrid!(plot::Plot{viz, Tuple{CartesianGrid{𝔼{…}, Cartesian3D{…}, 3, Tuple{…}}}}, ::Type{𝔼{3}}, ::Val{3}, ::Val{3})
@ MeshesMakieExt ~/.julia/packages/Meshes/Ncjx3/ext/grid/cartesian.jl:84