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% quartertorus.mp
% L. Nobre G.
% 2012
input featpost3Dplus2D;
prologues := 3;
verbatimtex
\documentclass{article}
\usepackage{mathpazo}
\begin{document}
etex
f := (3,5,2.5);
beginfig(1);
color a, b, c, g, h, i, j, l, m, n;
numeric fac, siz, s;
fac = 0.05;
siz = 0.3;
s = 2;
a = blue-red;
b = g-fac*a;
c = -a-fac*g;
g = -green;
h = 2*g;
i = red+g;
j= -red;
l = blue;
m = 0.6red-g;
n = -0.7*blue;
drawoptions( withpen pencircle scaled 2.5pt );
quartertorus( black, h, i, siz );
quartertorus( black, g, a, siz );
quartertorus( black, b, c, siz );
quartertorus( black, -g, j, siz );
quartertorus( n, l, m, siz );
label( btex $a$ etex scaled s, rp( a ) );
label.llft( btex $b$ etex scaled s, rp( b ) );
label( btex $c$ etex scaled s, rp( c ) );
label.urt( btex $g$ etex scaled s, rp( g ) );
label( btex $-g$ etex scaled s, rp( -g ) );
label( btex $h$ etex scaled s, rp( h ) );
%label( btex $i$ etex scaled s, rp( i ) );
label( btex $j$ etex scaled s, rp( j ) );
label( btex $l$ etex scaled s, rp( l+n ) );
label( btex $m$ etex scaled s, rp( m+n ) );
endfig;
beginfig(2);
color col[];
numeric ray, ang, len, bigray;
ray = 0.15;
bigray = 0.4;
ang = 60;
len = 0.7;
col1 = (-(ray+bigray)/cosd(ang),0,0);
col2 = (bigray*cosd(ang),0,bigray*sind(ang));
col3 = (bigray*cosd(ang),0,-bigray*sind(ang));
col4 = ((ray+bigray)*cosd(ang),0,(ray+bigray)*sind(ang));
col5 = ((ray+bigray)*cosd(ang),0,-(ray+bigray)*sind(ang));
col6 = (-len*sind(ang),0,len*cosd(ang));
col7 = (-len*sind(ang),0,-len*cosd(ang));
col8 = col1+col4+col6;
col9 = col1+col5+col7;
rigorousdisc( 0, true, col1+col3, ray, col7 );
rigorousdisc( 0, true, col1+col2, ray, col6 );
quartertorus( col1, col3, col2, ray );
draw rp(col9)--rp(black)--rp(col8);
endfig;
verbatimtex
\end{document}
etex
end.
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