Carving a cat eye into opaque plastic sheet

I’m making a light box Halloween decoration with a glowing yellow orange cat eye on the front and using a picture of sauron’s eye as an example, but my toolpath simulations look terrible. I want to have the surface be black and the eye to be varying shades of yellow/orange. My plan was to paint the back of an opaque plastic sheet yellow and the front black. Then cut into the black side of the sheet to reveal progressively brighter yellow by having the depth of cut increase anywhere the eye should be brighter. I thought I should use 3D Rough/Fine but I’m getting toolmarks over the whole piece in the simulation.

Stock Image for my example piece

Import settings

3D model before toolpaths

Simulation result showing toolpath.

I think I would try advanced V-carve to take away the black.
And you could paint the back with gradients of yellow & orange that would only show through where the black was removed.

Did you mean transparent plastic? or translucent? You may be able to find it in yellow, then just paint the orange.

I was originally thinking opaque as in frosted so I could use depth to control brightness.

Frosted is only on the surface, not all the way through. Once you paint it that’s gone.

Opaque - no light passes through
Translucent - less light passes through (Light table, or fluorescent light covers/lenses)
Frosted - the light is diffused, so it appears softer

You can get acrylic in colors… https://www.amazon.com/Lesnlok-Acrylic-Plexiglass-Painting-Projects/dp/B0CLNJ65QL/ref=sr_1_1_sspa?th=1

If you can airbrush the areas you want more red/orange on the back, you should get a pretty cool effect.

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