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% --- start of displayed preamble in the book ---
input featpost3Dplus2D
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
SphericalDistortion := true;
Spread := 50;
f := 0.4*(1.5,0.5,1);
numeric gridstep, sidenumber, i, coord;
color pa, pb, pc, pd;
gridstep = 0.1;
sidenumber = 5;
coord = 0.5*sidenumber*gridstep;
for i=0 upto sidenumber:
pa := (-coord,-coord+i*gridstep,0);
pb := (coord,-coord+i*gridstep,0);
pc := (-coord+i*gridstep,-coord,0);
pd := (-coord+i*gridstep,coord,0);
draw pathofstraightline( pa, pb );
draw pathofstraightline( pc, pd );
endfor;
endfig;
end;
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