55 lines
1.6 KiB
OpenSCAD
55 lines
1.6 KiB
OpenSCAD
function fSphere(r, sides=36, stripes=18) = (
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let(degrees_per_slice = 180 / stripes,
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degrees_per_side = 360 / sides,
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top_index = (stripes - 1) * sides)
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[
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[fKeyPoints, concat(
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[for (stripe_index = [1 : stripes - 1])
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for (side_index = [0 : sides - 1])
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let (stripe_angle = stripe_index * degrees_per_slice,
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side_angle = side_index * degrees_per_side,
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stripe_radius = r * sin(stripe_angle),
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stripe_z = r * cos(stripe_angle),
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side_x = stripe_radius * sin(side_angle),
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side_y = stripe_radius * cos(side_angle))
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[side_x, side_y, stripe_z]
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],
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[
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[0, 0, r], // top
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[0, 0, -r], // bottom
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]
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)],
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[fKeyFaces, concat(
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// side squares
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[for (stripe_index = [2 : stripes - 1])
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for (side_index = [0 : sides - 1])
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let (prev_side_base = (stripe_index - 2) * sides,
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side_base = (stripe_index - 1) * sides)
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[
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prev_side_base + (side_index + 1) % sides,
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prev_side_base + side_index,
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side_base + side_index,
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side_base + (side_index + 1) % sides,
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]
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],
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// top triangles
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[for (side_index = [0 : sides - 1])
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[
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top_index,
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side_index,
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(side_index + 1) % sides,
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]
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],
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// bottom triangles
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[for (side_index = [0 : sides - 1])
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let (side_base = (stripes - 2) * sides)
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[
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top_index + 1,
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side_base + (side_index + 1) % sides,
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side_base + side_index,
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]
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]
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)],
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]
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);
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