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# Helix with radius s, inner radius 2s |
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define @b (3 * s) / 2 |
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define @a @b / π |
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-4*s <= x <= 4*s |
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-4*s <= y <= 4*s |
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-s <= z <= 2*s |
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(ρ - 3*s)^2 + (z - @b - (@a * φ))^2 <= s^2 \ |
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∨ \ |
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(ρ - 3*s)^2 + (z - 3*s - @b - (@a * φ))^2 <= s^2 \ |
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∨ \ |
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(ρ - 3*s)^2 + (z + 3*s - @b - (@a * φ))^2 <= s^2
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