Orthographic projection

using GeoMakie, CairoMakie

lons = -180:180
lats = -90:90
field = [exp(cosd(l)) + 3(y/90) for l in lons, y in lats]

fig = Figure()
ga = GeoAxis(
    fig[1, 1],
    dest="+proj=ortho",
    title = "Orthographic projection",
    xticklabelcolor=:red, xgridcolor=:red,
)
sp = surface!(ga, lons, lats, zeros(size(field)); color=field, shading = NoShading, colormap=:rainbow_bgyrm_35_85_c69_n256)
cb = Colorbar(fig[1, 2], sp)
fig

We can also draw some coastlines here, and make sure they're always above the surface:

lp = lines!(
    ga, GeoMakie.coastlines();
    transformation = (; translation = (0, 0, 50))
)
fig

Note the transformation keyword argument. Another syntax to do this post facto is by using the translate! function:

translate!(lp, (0, 0, -51))
fig

Whoa! It vanished!

translate!(lp, (0, 0, 50))
fig

And it's back! Note that translate! sets the absolute translation. If you want to translate relatively, use translate!(Accum, ...) instead.

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