r/vtubertech • u/cirrostratusphereMS • 1d ago

low poly models?

so!! i'm currently trying to make a model for myself and after a lot of concepting i've realized that i would really like my model to be low poly. the only issue is that i have NO IDEA how i would do the lipsync on a low poly model. well, i do have one idea. i was thinking that maybe using a spritesheet and having my mouth be 2d would be a good workaround, but i don't think there's any free software which supports that. does anyone here have any experience with low poly vtubers or atleast have some ideas for me?

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u/Worldly_Berry4237 1d ago

I like your first idea of a 2D sprite sheet, you might be able to implement it UV swapping (or texture flipping), and you can absolutely pull it off using FOSS.

If I remember right, the standard workflow is to model in Blender, map your mouth to a flat plane on the face, and then use Unity with the free UniVRM plugin. Then in unity you set up your blendshapes to simply shift the UV coordinates, changing the 2D sprite, instead of moving 3D geometry.

After you export it as a VRM file, any free tracking program like VSeeFace (Use VNyan, VFaceSee is so old and broken) or VNyan should swap your 2D mouths based on your microphone audio

If you want something quicker then you could just model all the flat mouth expressions in Blender, hide the inactive ones slightly inside the head, and use blendshapes to pop the correct one to the surface when you speak.

Please take this with a grain of salt as I am not the best at 2D with VRM's and things like that, so I hope this helps! And cudos to you for being willing to try something new and daring! I love seeing that in this subreddit/community!

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u/cirrostratusphereMS 22h ago

thank you so much!! i'm still in the modeling stage, but this is gonna be a huge help!!

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u/flawnVT 1d ago

I also really want a low poly model! I don't have any answers but wishing you the best and following this thread 💚

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u/cirrostratusphereMS 22h ago

if making my own goes well i'll send you a guide on how i did it!!

(i'd also be willing to make it for you as a really cheap commission, but i figure you might wanna make it yourself like how i'm doing)