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+% D. Roegel, 7 January 2001
+% roegel@loria.fr
+
+verbatimtex
+%&latex
+\documentclass{article}
+\usepackage{mathpple}
+\begin{document}
+etex
+
+input 3danim
+input 3dgeom
+output_res:=72;
+drawing_scale:=13cm;
+
+numeric b,c,d,e;b=70;c=0;d=20;e=50; % parameterized angles
+
+vardef def_T(expr inst)=
+  new_obj_points(inst,10); % 10 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);
+  new_plane(bcd)(2,3,4);
+  new_line(ij)(5,6);
+  boolean b;
+  b:=def_inter_p_l_pl(7)(ij)(bcd); if not b: ... fi;
+  % K=middle of AD
+  mid_point(8,1,4);
+  set_line(ij)(5,8);
+  b:=def_inter_p_l_pl(9)(ij)(bcd); if not b: ... fi;
+  set_line(ij)(6,8);
+  b:=def_inter_p_l_pl(10)(ij)(bcd); if not b: ... fi;
+  free_line(ij);
+  free_plane(bcd);
+enddef;
+
+vardef draw_T(expr inst)=
+  drawoptions(dashed evenly);draw_line(2,4);draw_line(8,5);
+  drawoptions();
+  draw_line(1,2);draw_line(1,3);draw_line(1,4);
+  draw_line(2,3);draw_line(3,4);
+  pickup pencircle scaled 2pt;
+  draw_line(5,5);draw_line(6,6);draw_line(7,7);draw_line(8,8);
+  draw_line(9,9);draw_line(10,10);
+  pickup pencircle scaled .4pt;
+  draw_line(5,7);draw_line(3,7);
+  draw_line(8,9);draw_line(4,9);
+  draw_line(8,10);draw_line(3,10);
+  draw_line_extra(9,10)(-0.1,1.1);
+  label_obj.top(btex $A_1$ etex,1);
+  label_obj.lft(btex $B_2$ etex,2);
+  label_obj.llft(btex $C_3$ etex,3) shifted (-2.5mm,1mm);
+  label_obj.top(btex $D_4$ etex,4);
+  label_obj.lft(btex $I_5$ etex,5);
+  label_obj.lft(btex $J_6$ etex,6) shifted (-2mm,0);
+  label_obj.lrt(btex $M_7$ etex,7);
+  label_obj.urt(btex $K_8$ etex,8);
+  label_obj.lrt(btex $N_9$ etex,9);
+  label_obj.lrt(btex $L_{10}$ etex,10);
+
+enddef;
+
+assign_obj("tetra","T");
+
+new_vec(v_a);new_vec(v_b);new_vec(v_c);
+vec_diff_(v_a,pnt_obj("tetra",3),pnt_obj("tetra",4)); % vec(DC)
+vec_mult_(v_a,v_a,5);
+vec_diff_(v_b,pnt_obj("tetra",3),pnt_obj("tetra",2)); % vec(BC)
+vec_mult_(v_b,v_b,5);
+vec_diff_(v_c,pnt_obj("tetra",1),pnt_obj("tetra",3)); % vec(CA)
+vec_mult_(v_c,v_c,3);
+vec_sum_(Obs,pnt_obj("tetra",3),v_a); % C + 5DC
+vec_sum_(Obs,Obs,v_b);% C + 5DC + 5BC
+vec_sum_(Obs,Obs,v_c);% C + 5DC + 5BC + 3CA
+free_vec(v_c);free_vec(v_b);free_vec(v_a);
+
+%for i:=0 upto 20:
+i=8;
+  beginfig(200+i);
+    % Observator
+    %set_point_(Obs)(20*cosd(3.6*i),20*sind(3.6*i),6);
+    Obs_phi:=0;Obs_dist:=2;point_of_view_obj("tetra",1,Obs_phi);
+    draw_obj("tetra"); 
+  endfig;
+%endfor; 
+
+end.
+
+
+
+