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I am confused on how to pick the right numbers for my threads for a compute shader.

I am trying to implement an FFT algorithm on a float2 buffer which is 1024 elements in size. Does that mean i have to set my threads to something like

[32,32,1] so that i have 32*32 = 1024?

I am no expert on this stuff, its kinda confusing....hope someone can explain what numbers i should be aiming for here.

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