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% nemsaddl.mp and nemsplay.mp and nemtwist.mp and nembends.mp
% L. Nobre G.
% 2002
input featpost3Dplus2D;
beginfig(1);
f := 2*(5,3,4);
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;
color lenvec, currpos;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% splay, sddle and twist
angstep := 10;
cylength := 0.6;
cyradius := 0.1;
basen := 3;
hn := 1;
basestep := cyradius*4.2;
hstep := cylength*1.4;
basesdev := cyradius*0.003;
hsdev := hstep*0.005;
hbase := -0.8;
angsdev := 3;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% bend
% angstep := 15;
% cylength := 0.6;
% cyradius := 0.1;
% basen := 3;
% hn := 1;
% basestep := cylength*1.6;
% hstep := cyradius*3.4;
% basesdev := basestep*0.01;
% hsdev := hstep*0.005;
% hbase := -0.8;
% angsdev := 3;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
basemax := basen*basestep;
hmax := hn*hstep;
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 := angle((xcurr,ycurr))+angsdev*normaldeviate;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% atwo := ( i ++ j )*angstep + angsdev*normaldeviate;
% vcz := cosd( atwo );
% vcy := sind( atwo )*sind( aone ); % pure-splay
% vcx := sind( atwo )*cosd( aone ); % pure-splay
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% atwo := ( i ++ j )*angstep + angsdev*normaldeviate;
% vcz := cosd( atwo );
% vcy := sind( atwo )*sind( aone ); % saddle-splay
% vcx := -sind( atwo )*cosd( aone ); % saddle-splay
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
atwo := ( i ++ j )*angstep + angsdev*normaldeviate;
vcz := cosd( atwo );
vcy := sind( atwo )*sind( aone+90 );% pure-twist
vcx := sind( atwo )*cosd( aone+90 );% pure-twist
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% atwo := j *angstep + angsdev*normaldeviate;
% vcz := sind( atwo );
% vcy := cosd( atwo ); % pure-bend
% vcx := 0; % pure-bend
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
currpos := ( xcurr, ycurr, zcurr );
lenvec := cylength*( vcx, vcy, vcz );
rigorousdisc( 0, true, currpos-0.5*lenvec, cyradius, lenvec);
endfor;
endfor;
endfor;
endfig;
end;
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