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How can I see vertex alpha as I paint it in Vertex Paint mode in 2.8? I get how to see vertex colors, via the node system, in LookDev, but I can't seem to figure how to see vertex alpha as I go to add and erase it...

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  • $\begingroup$ I know this is old but here's the trick for anyone like me stumbling upon this in search for an answer: youtube.com/watch?v=Km1HLQpbCoo $\endgroup$
    – Lasse
    Commented Feb 18, 2021 at 11:29

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It's often wise to set up your material and open up a material or rendered preview viewport. You can have multiple viewports open.

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You can paint in either window. For alpha in a material preview, you'll need to set an appropriate alpha blend mode for your material, and to set that, you'll have to temporarily switch to the Eevee renderer-- material preview is just an Eevee render.

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