# Can I apply a ColorFunction to FaceGrids, or otherwise have FaceGrids with varying color?

I want to make a 3d plot with FaceGrids with a certain color scheme. Specifically, I'd like them to be one color below a diagonal line, and a different color above it. (So for example, on the y=0 surface, I'd like the FaceGrids to be pink below x=z, and blue above x=z.)

If I were coloring the plot itself, I'd define a ColorFunction, but it seems that FaceGrids doesn't take ColorFunction as an option. Here's an example of my best attempt:

Graphics3D[Cylinder[],
FaceGrids -> {{{0, -1,
0}, {{{-1/2, ColorFunction -> Function[{x, y, z}, Hue[z]]}, {0,
Green}, {1/2, Blue}}, {-1/3, {1/3,
Directive[Thick, Dashed]}}}}}]


Note that while the other gridlines have the properties assigned, the one with a ColorFunction is just gray.

Is there any way to have varying colors on FaceGrids?

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I don't think it's possible to vary the color along a mesh line. So you'll probably have to do the lines by hand:

Graphics3D[{Cylinder[], Pink, Line[{{-1/2, -1, -1}, {-1/2, -1, 0}}],
Blue, Line[{{-1/2, -1, 0}, {-1/2, -1, 1}}]},
PlotRange -> {{-1, 1}, {-1, 1}, {-1, 1}},
FaceGrids -> {{{0, -1,
0}, {{{0, Green}, {1/2, Blue}}, {-1/3, {1/3,
Directive[Thick, Dashed]}}}}}]


You can apply color functions in a way that varies the color from one line to the next, as shown for MeshStyle in this question. But I don't think that's what you meant.

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