Don't do this. It's expensive as hell to implement and player's won't notice it. 
https://twitter.com/ShakaInc/status/1308499637846839301 …
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Would it be expensive? I would just have 2 (or 3, if you want multiple directions) textures, and when the player enters a trigger, switch to the directional texture that you want in the shader. It doesnt need to be reactive, so you could even do the check every .5 sec
no you don't even need to do this, you just keep track of player0 on the client, feed their pos into a uniform buffer, and then the pixel shader just switches animations based on proximity - no need to touch the CPU for this
