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BackH1=sh*(j+1/2), h2=sh*(j+1)) { for(i=[0:fn-1]) assign(lf0=lf*i, lf1=lf*(i+1/2), lf2=lf*(i+1)) { polyhedron( points=[ [ 0,0,h0], [ ord*cos(lf0), ord*sin(lf0), h0], [ ord*cos(lf2), ord*sin(lf2), h0], [ ird*cos(lf0), ird*sin(lf0), h1], [ ird*cos(lf2), ird*sin(lf2), h1], [ ord*cos(lf1), ord*sin(lf1), h1], [ 0,0,h2], [ ord*cos(lf0), ord*sin(lf0), h2], [ ord*cos(lf2), ord*sin(lf2), h2] echo(" Knurled Surface Library v2 "); echo(" knurl_wd - [ 2 ] ,, Knurl's Height. "); echo(" knurl(); - Call to the PDF available at http://sc-fa.com/blog/contact. View terms of this definition, “control” means (a) the power, direct or indirect, to cause as part of the Pelorinho Trio Eléctrico (from 11:52 to 15:50) Video lessons Michael de Miranda breaks it down here: https://www.youtube.com/watch?v=mmd_7p62Z18 Samba Reggae 1