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+% D. Roegel January 2001
+% roegel@loria.fr
+
+% oblique projections
+
+input 3danim
+output_res:=72;
+drawing_scale:=3cm;
+
+projection_type:=2;
+
+%set_plane_(projection_plane)(point_null,vec_I,vec_J);
+set_plane_(projection_plane)(point_null,vec_I,vec_K);
+
+
+vardef def_C(expr inst)=
+ new_obj_points(inst,8); % 8 points
+ set_C_points(inst);
+enddef;
+
+vardef set_C_points(expr inst)=
+ set_point(1)(0,0,0);set_point(2)(0,0,1);
+ set_point(3)(0,1,0);set_point(4)(0,1,1);
+ set_point(5)(1,0,0);set_point(6)(1,0,1);
+ set_point(7)(1,1,0);set_point(8)(1,1,1);
+enddef;
+
+vardef draw_C(expr inst)=
+ draw_lines(1,2,4,3,1);draw_lines(5,6,8,7,5);
+ draw_line(1,5);draw_line(2,6);draw_line(3,7);draw_line(4,8);
+enddef;
+
+assign_obj("cube","C");
+
+for i:=0 upto 20:
+ 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("cube",8,Obs_phi);
+ draw_obj("cube");
+ endfig;
+endfor;
+
+end.
+
+
+
+