#in types.jl
@Block Axis3 <: AbstractAxis begin
...
"Controls if the 4. Spines are created to close the outline box"
fullbox = false
"The color of x spine 4"
xspinecolor_4 = :black
"The color of y spine 4"
yspinecolor_4 = :black
"The color of z spine 4"
zspinecolor_4 = :black
"The x spine width"
...


#in axis3d.jl
function add_gridlines_and_frames!(topscene, scene, ax, dim::Int, limits, ticknode, miv, min1, min2, xreversed, yreversed, zreversed)
...
 framepoints = lift(limits, scene.camera.projectionview, scene.viewport, min1, min2, xreversed, yreversed, zreversed
            ) do lims, _, pxa, mi1, mi2, xrev, yrev, zrev
        o = pxa.origin

        rev1 = (xrev, yrev, zrev)[d1]
        rev2 = (xrev, yrev, zrev)[d2]

        mi1 = mi1 ⊻ rev1
        mi2 = mi2 ⊻ rev2

        f(mi) = mi ? minimum : maximum
        p1 = dpoint(minimum(lims)[dim], f(!mi1)(lims)[d1], f(mi2)(lims)[d2])
        p2 = dpoint(maximum(lims)[dim], f(!mi1)(lims)[d1], f(mi2)(lims)[d2])
        p3 = dpoint(minimum(lims)[dim], f(mi1)(lims)[d1], f(mi2)(lims)[d2])
        p4 = dpoint(maximum(lims)[dim], f(mi1)(lims)[d1], f(mi2)(lims)[d2])
        p5 = dpoint(minimum(lims)[dim], f(mi1)(lims)[d1], f(!mi2)(lims)[d2])
        p6 = dpoint(maximum(lims)[dim], f(mi1)(lims)[d1], f(!mi2)(lims)[d2])
        p7 = dpoint(minimum(lims)[dim], f(!mi1)(lims)[d1], f(!mi2)(lims)[d2])
        p8 = dpoint(maximum(lims)[dim], f(!mi1)(lims)[d1], f(!mi2)(lims)[d2])

        # we are going to transform the 3d frame points into 2d of the topscene
        # because otherwise the frame lines can
        # be cut when they lie directly on the scene boundary
        if ax.fullbox[] == true
            to_topscene_z_2d.([p1, p2, p3, p4, p5, p6, p7, p8], Ref(scene))
        else 
            to_topscene_z_2d.([p1, p2, p3, p4, p5, p6], Ref(scene))
        end    
    end
    colors = Observable{Any}()
    if ax.fullbox[] == true
        map!(vcat, colors, attr(:spinecolor_1), attr(:spinecolor_2), attr(:spinecolor_3), attr(:spinecolor_4))
    else
        map!(vcat, colors, attr(:spinecolor_1), attr(:spinecolor_2), attr(:spinecolor_3))
    end
    framelines = linesegments!(topscene, framepoints, color = colors, linewidth = attr(:spinewidth),
    # transparency = true,
visible = attr(:spinesvisible), inspectable = false)
...

function to_topscene_z_2d(p3d, scene)
    o = scene.viewport[].origin
    p2d = Point2f(o + Makie.project(scene, p3d))
    # -10000 is an arbitrary weird constant that in preliminary testing didn't seem
    # to clip into plot objects anymore
    Point3f(p2d..., 10000)
end