How can I Create a world with this grid in runtime?

Normally, a plane + tiling material. Or do you need to dynamically change the grid?

You could experiment with generating offset bands, something I used in an older project and it worked pretty well afair (should work in 4.20, but who knows!):

Remove the radial exponential if you do not need a falloff, turn 32 & 8 into scalars to control the density.

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