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% D. Roegel, 9 January 2001
% roegel@loria.fr
input 3danim
input 3dgeom
output_res:=72;
drawing_scale:=15cm;
vardef def_T(expr inst)=
new_obj_points(inst,12); % 12 points
set_T_points(inst);
enddef;
vardef set_T_points(expr inst)=
set_point(1)(0,0,0);
set_point(2)(1,0,0);
set_point(3)(1,1,0);
set_point(4)(0,1,0);
set_point(5)(0,0,1);
set_point(6)(1,0,1);
set_point(7)(1,1,1);
set_point(8)(0,1,1);
new_vec(v);
vec_diff_(v,pnt(1),pnt(4));
vec_sum_(pnt(9),pnt(1),v);
mid_point(10,1,2);
vec_sum_(pnt(11),pnt(2),v);
mid_point(12,7,8);
enddef;
vardef draw_T(expr inst)=
draw_line(1,2);draw_line(2,3);
draw_line(5,6);draw_line(6,7);draw_line(7,8);draw_line(8,5);
draw_line(1,5);draw_line(2,6);draw_line(3,7);
draw_line(9,10);draw_line(10,11);draw_line(11,9);
draw_line(5,12);draw_line(12,6);draw_line(6,5);
drawoptions(dashed evenly);
draw_line(3,4);draw_line(4,1);draw_line(4,8);
draw_line(5,9);draw_line(10,12);draw_line(6,11);
drawoptions();
fill z[ipnt_(9)]--z[ipnt_(10)]--z[ipnt_(11)]--cycle withcolor 0.8white;
fill z[ipnt_(5)]--z[ipnt_(12)]--z[ipnt_(6)]--cycle withcolor 0.8white;
draw_equal_marks(1,4,2);
draw_equal_marks(1,5,2);
enddef;
assign_obj("tetra","T");
%for i:=0 upto 30:
i=23;
beginfig(100+i);
% Observator
set_point_(Obs)(10*cosd(3.6*i-150),10*sind(3.6*i-150),3);
Obs_phi:=90;Obs_dist:=2;point_of_view_obj("tetra",1,Obs_phi);
draw_obj("tetra");
endfig;
%endfor;
end.
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