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Ray-Tracing on Paper Sprites Not Working

I'm working on a 2.5D game where I have hand-drawn sprites inside a 3D Side Scroller game, and I wanted to experiment with having shadows cast off the Paper 2D sprites through ray-tracing, but no shadows are enabled once ray tracing is enabled.

I saw on the official listing for supported materials that lit sprite materials are supported, and I have no trouble casting shadows off 2D sprites without ray-tracing. I can get low quality shadows by raising the Contact Shadow Length setting in each light, but the shadow quality through this setting is less than desirable.

Is there another setting I'd need to activate, or are Paper 2D sprites and/or the Masked Lit Sprite Material not yet supported for ray tracing?

For reference, I'm running version 4.22 through the DirectX12 shortcut with an RTX 2080Ti, and have had no issues with ray tracing on other elements in my project.

Product Version: UE 4.22
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asked Jul 04 '19 at 03:24 PM in Rendering

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