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% twistroundbiax.mp
% L. Nobre G.
% 2002
%input featpost3Dplus2D;
beginfig(1);
f := (2,1,1);
Spread := 250;
color gridvec, sizevec, currpos, starpos, bordpos;
numeric i, j, k, counter, theta, phi, gamma, thetamin, innercircle,
thetamax, thetastp, long, base, radius, polar, larg;
sizevec := (4,36,1);
gridvec := (0.143,0.1,0.1);
thetamin := 90;
thetamax := 150;
long := 0.08;
larg := 0.02;
base := 0.2;
gamma := -30;
innercircle := 0.5;
thetastp := (thetamax-thetamin)/(X(sizevec)-1);
starpos := ( -X(gridvec)*X(sizevec) ,
-X(gridvec)*X(sizevec) ,
0 );
bordpos := starpos;
npf1 := 4;
F1p1 := bordpos;
F1p2 := (X(bordpos),-Y(bordpos), Z(bordpos));
F1p3 := (-X(bordpos),-Y(bordpos), Z(bordpos));
F1p4 := (-X(bordpos),Y(bordpos), Z(bordpos));
NF := 1;
draw facepath(1);
counter := 0;
for i=1 upto X(sizevec):
radius := (i-innercircle)*X(gridvec);
polar := i*floor(Y(sizevec)/X(sizevec));
for j=1 upto polar:
for k=1 upto Z(sizevec):
phi := 360*(j-1)/polar;
theta := thetamin+(i-innercircle)*thetastp;
currpos := radius*(cosd(phi-90),sind(phi-90),0)
+(k-1)*(0,0,Z(gridvec));
counter := incr(counter);
% generateonebiax( counter, phi, theta, long,
% gamma, larg, currpos );
generatedirline( counter, phi, theta, long, currpos );
endfor;
endfor;
endfor;
NL := counter;
director_invisible( true, base, false );
endfig;
end;
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