How to add outline in viewport frame?

The new highlight feature is released and works. But it isn’t working in viewport frames as they just render a few things. Is there a way to make an outline for parts that works properly in viewport frame/without highlights or inverted normals?

Normals are weird and would be time consuming*
Selection box doesn’t work either.

Sounds like an engine bug to me, a hacky fix could be duplicating the viewport frame with the exact same size plus 1-2 offset (UDim2.new(1,2,1,2)) and making it dark to mimic an outline.

Hm, I guess that could work. I’ll try that right now.

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Oh yeah, also set the ZIndex of the outline frame to one below the actual viewport.

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Yeah. I did that, it seemed like it would work but it does have an offset. It only looks good at a set angle.
image
Also the anchor point is in the middle. The viewport frame just doesn’t work that well.

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That’s annoying, I wish you could file a bug report.