I guess you mean Z fighting? I had these problems, it was very ugly when i rotated the cam and i solved it with small value (0.001) added / subtracted from either Z or X vertex coords and now they don't flicker.
The faces are drawn with that tiny offset but it's very hard to see anything unless you look very close to the flat face.
And no, i don't have any specific order of rendering.
Atm, im trying to draw zones (areas) with nx.CreatePlane with specific colors and alpha (so you can see through it).
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