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+% D. Roegel, 7 January 2001
+% roegel@loria.fr
+
+verbatimtex
+%&latex
+\documentclass{article}
+\begin{document}
+etex
+
+input 3danim
+input 3dgeom
+output_res:=72;
+drawing_scale:=7cm;
+
+numeric b,c,d,e;b=70;c=0;d=20;e=50; % parameterized angles
+
+vardef def_T(expr inst)=
+ new_obj_points(inst,6); % 6 points
+ set_T_points(inst);
+enddef;
+
+vardef set_T_points(expr inst)=
+ set_point(1)(0,0,0);
+ set_point(2)(3*cosd(b),3*sind(b),0);
+ set_point(3)(6*cosd(c),6*sind(c),0);
+ new_vec(v_a);new_vec(v_b);
+ vec_def_vec_(v_a,vec_I);
+ vec_rotate_(v_a,vec_K,d);
+ vec_prod_(v_b,v_a,vec_K);
+ vec_rotate_(v_a,v_b,e);
+ vec_mult_(v_a,v_a,4.5);
+ vec_sum_(pnt(4),pnt(1),v_a);
+ free_vec(v_b);free_vec(v_a);
+ % Determination of I and J:
+ % I=A + unit(AB)
+ vec_diff(5,2,1);
+ vec_unit(5,5);
+ vec_sum(5,5,1);
+ % J=A + 4*unit(AC)
+ vec_diff(6,3,1);
+ vec_unit(6,6);
+ vec_mult(6,6,4);
+ vec_sum(6,6,1);
+
+enddef;
+
+vardef draw_T(expr inst)=
+ drawoptions(dashed evenly);
+ draw_line(1,2);draw_line(1,3);draw_line(1,4);
+ drawoptions();
+ draw_line(2,3);draw_line(2,4);draw_line(3,4);
+ pickup pencircle scaled 2pt;
+ draw_line(5,5);draw_line(6,6);
+ label_obj.ulft(btex $A_1$ etex,1);
+ label_obj.rt(btex $B_2$ etex,2);
+ label_obj.lft(btex $C_3$ etex,3);
+ label_obj.top(btex $D_4$ etex,4);
+ label_obj.top(btex $I_5$ etex,5);
+ label_obj.top(btex $J_6$ etex,6);
+
+enddef;
+
+assign_obj("tetra","T");
+
+%for i:=0 upto 20:
+i=8;
+ beginfig(100+i);
+ % Observator
+ set_point_(Obs)(20*cosd(3.6*i),20*sind(3.6*i),6);
+ Obs_phi:=90;Obs_dist:=2;point_of_view_obj("tetra",1,Obs_phi);
+ draw_obj("tetra");
+ endfig;
+%endfor;
+
+end