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% signalvertexSD.mp
% L. Nobre G.
% 2003
%input featpost3Dplus2D;
% Draw a torus with NP dots, a section of 3.14*RS^2
% and a total diameter of 2*(RB+RS). The dots are placed
% on a single closed line that turns around the $z$ axis
% NB times and around the section NS times.
f := 0.45f;
%SphericalDistortion := true; Spread := 11;
beginfig(1);
NP:=2000;
RB:=1;
RS:=0.2;
R3:=0.0;
NB:=8;
NS:=5;
jB:=360*NB/NP;
jS:=360*NS/NP;
for i=1 upto NP:
phi :=i*jS;
theta :=i*jB;
first :=(RB+(RS+R3*sind(4*theta))*cosd(phi))*cosd(theta);
second:=(RB+(RS+R3*sind(4*theta))*cosd(phi))*sind(theta);
third := (RS+R3*sind(4*theta))*sind(phi);
signalvertex( (first,second,third), 1, black );
endfor;
endfig;
end;
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