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// constant circumscribed sphere
function circ_rad(size) = size * sqrt(3) / 2;
//function s2s_d4(size) = circ_rad(size)*4/sqrt(6);
//function s2s_d6(size) = size;
//function s2s_d8(size) = circ_rad(size)*2/sqrt(2);
//function s2s_d12(size) = circ_rad(size)*4/(sqrt(3)*(1+sqrt(5)));
//function s2s_d20(size) = circ_rad(size)*4/(sqrt(10+2*sqrt(5)));
// measured on existing dice (14 mm)
function s2s_d4(size) = size * 1.57;
function s2s_d6(size) = size;
function s2s_d8(size) = size * 1.21;
function s2s_d12(size) = size * 0.86;
function s2s_d20(size) = size * 0.86;
// measured on existing dice (averaged between sizes)
//function s2s_d4(size) = size * 1.40;
//function s2s_d6(size) = size;
//function s2s_d8(size) = size * 1.16;
//function s2s_d12(size) = size * 0.81;
//function s2s_d20(size) = size * 0.78;
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