Custom geometry defined via vertice and face array does not render or flickers very badly

[teolitto]

hello - been trying to define my own geometry with verts and faces, but when I try I get really bad flicker/poor behavior. Ripping my hair out. Tried about 5 different ways.

It seems to work when I render the same verts and faces directly with three, but when I try to do it in R3F I get unworkable flicker.

What am I doing wrong?

Test site is here - you may need to resize window, right click, or scroll to get the red triangle to appear

R3F with flicker: https://codesandbox.io/s/affectionate-snow-hmkrv?file=/src/App.js
vanilla three renders same verts and faces without flicker: https://codesandbox.io/s/threejs-bare-example-forked-02poe?file=/index.js

[drcmda]

i only see a blank screen. btw geometry is gone, it doesnt exist in threejs any longer. using it for anything these days makes little sense, you wont be able to update.