File: formula_menger_sponge.cpp

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mandelbulber2 2.20-2
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z.x = fabs(z.x);
z.y = fabs(z.y);
z.z = fabs(z.z);
if (z.x - z.y < 0.0) swap(z.x, z.y);
if (z.x - z.z < 0.0) swap(z.x, z.z);
if (z.y - z.z < 0.0) swap(z.y, z.z);
z *= 3.0;
z.x -= 2.0;
z.y -= 2.0;
if (z.z > 1.0) z.z -= 2.0;