import three; currentprojection = perspective(300,-650,500); surface carbon = scale3(70)*unitsphere; // 70 pm surface hydrogen = scale3(25)*unitsphere; // 25 pm real alpha = 90+aSin(1/3); real CCbond = 156; // 156 pm real CHbond = 110; // 110 pm triple c1 = (0,0,0); triple h1 = c1+CHbond*Z; triple c2 = rotate(alpha,c1,c1+Y)*(CCbond*Z); triple h2 = rotate(120,c1,c2)*h1; triple h3 = c2-CHbond*Z; triple h4 = rotate(120,c2,c1)*h3; triple c3 = rotate(120,c2,h3)*c1; triple h5 = c3+CHbond*Z; triple h6 = rotate(-120,c3,c2)*h5; triple c4 = rotate(-120,c3,h5)*c2; triple h7 = c4-CHbond*Z; triple h8 = rotate(120,c4,c3)*h7; triple c5 = rotate(120,c4,h7)*c3; triple h9 = c5+CHbond*Z; triple h10 = rotate(-120,c5,c4)*h9; triple c6 = rotate(-120,c5,h9)*c4; triple h11 = c6-CHbond*Z; triple h12 = rotate(120,c6,c5)*h11; draw(shift(c1)*carbon,black); draw(shift(c2)*carbon,black); draw(shift(c3)*carbon,black); draw(shift(c4)*carbon,black); draw(shift(c5)*carbon,black); draw(shift(c6)*carbon,black); draw(shift(h1)*hydrogen,lightgray); draw(shift(h2)*hydrogen,lightgray); draw(shift(h3)*hydrogen,lightgray); draw(shift(h4)*hydrogen,lightgray); draw(shift(h5)*hydrogen,lightgray); draw(shift(h6)*hydrogen,lightgray); draw(shift(h7)*hydrogen,lightgray); draw(shift(h8)*hydrogen,lightgray); draw(shift(h9)*hydrogen,lightgray); draw(shift(h10)*hydrogen,lightgray); draw(shift(h11)*hydrogen,lightgray); draw(shift(h12)*hydrogen,lightgray); pen thick = linewidth(10); draw(c1--c2--c3--c4--c5--c6--cycle,thick); draw(c1--h1,thick); draw(c1--h2,thick); draw(c2--h3,thick); draw(c2--h4,thick); draw(c3--h5,thick); draw(c3--h6,thick); draw(c4--h7,thick); draw(c4--h8,thick); draw(c5--h9,thick); draw(c5--h10,thick); draw(c6--h11,thick); draw(c6--h12,thick);