in attach file i draw serface b: z = sqrt((-1)^floor(x) (-1)^floor(y)) sqrt(16 - x² - y²) but not exact . why? or how i can correct it?
the account of points needed for more accuracy is out of the default settings of GG.
you will need more points
m1 = Sequence(Sequence(If(k ≤ x ≤ k + 1 ∧ j ≤ y ≤ j + 1 ∧ Mod(k + j, 2) ≟ 0, sqrt(16 - x² - y²)), k, -4, 4), j, -4, 4)
this is nice and exact.
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