import solids;
size(7.5cm,0);

currentprojection=orthographic(3,1,2);

triple vect=(-.5,1.5,.5);
transform3 t=shift(vect);
triple pA=(1,0,1), pB=(4,0,1), pC=(1,0,4);
path3 tri=pA--pB--pC--cycle,
      trit=t*tri,
      tritt=t*t*tri;

draw(tri,1bp+.5green);
draw(trit^^tritt);

limits(O,X+Y+Z);
xaxis3(Label("$x$",1),Arrow3);
yaxis3(Label("$y$",1),Arrow3);
zaxis3(Label("$z$",1),Arrow3);

pen p1=.8bp+blue+dotted;
draw(pA--pA+vect,p1,Arrow3);
draw(pB--pB+vect,p1,Arrow3);
draw(pC+vect--pC+2*vect,p1,Arrow3);

shipout(format="pdf", bbox(3mm,white));