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% nemquira.mp
% L. Nobre G.
% 2002
%input featpost3Dplus2D;
beginfig(1);
f := 7*(1,2,1);
Spread := 70;
numeric hstep, hmax, hsdev, basestep, basemax, basesdev;
numeric i, j, k, angsdev, cylength, cyradius, basen, hn;
numeric vcx, vcy, vcz, hcurr, xcurr, ycurr, hbase, aone;
numeric atwo, zcurr, angstep, counter;
color lenvec, currpos;
angstep := 20;
cylength := 0.45;
cyradius := 0.1;
basen := 4.5;
hn := 1;
basestep := cylength*1.37;
hstep := basestep;
basesdev := basestep*0.05;
hsdev := basesdev;
hbase := -0.8;
angsdev := 4;
basemax := basen*basestep;
hmax := hn*hstep;
counter := 0;
for i=-basen upto basen:
for j=-basen upto basen:
hcurr := hbase;
forever:
exitunless hcurr < hmax+hbase;
hcurr := hcurr + hstep;
zcurr := hcurr + hsdev*normaldeviate;
xcurr := i*basestep + basesdev*normaldeviate;
ycurr := j*basestep + basesdev*normaldeviate;
aone := angsdev*normaldeviate;
atwo := j*angstep + angsdev*normaldeviate;
vcz := sind( atwo+90 );
vcy := cosd( atwo+90 )*sind( aone );
vcx := cosd( atwo+90 )*cosd( aone );
currpos := ( xcurr, ycurr, zcurr );
lenvec := cylength*( vcx, vcy, vcz );
% rigorousdisc( 0, true, currpos-0.5*lenvec, cyradius, lenvec);
counter := incr(counter);
generatedirline( counter, aone, 90+atwo, cylength, currpos );
endfor;
endfor;
endfor;
NL := counter;
director_invisible( true, 5, false );
endfig;
end;
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