Is it possible to add a sprite to the highlight layer?

Just want to achieve what the highlight mesh renderer does on a sprite (hopefully takes into account the alpha): Highlight a Mesh - Babylon.js Documentation

That is a question for @sebavan!

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This is not supported for sprites at all as we mainly base everything of the material.

Actually for sprites I would advise to bake the effect in the pictures to gain a ton of perf back.