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% Cube projections
% D. Roegel 23 January 2001
% roegel@loria.fr
input 3danim
output_res:=72;
drawing_scale:=2cm;
projection_type:=1;
%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_line(2,6);draw_line(4,8);draw_line(1,5);
draw_lines(5,6,8);
drawoptions(dashed evenly);
draw_line(3,7);draw_lines(8,7,5);
drawoptions();
enddef;
assign_obj("cube","C");
% Trimetric projection
i:=67;
beginfig(167);
% 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;
% Isometric projection
isometric_projection(vec_I,vec_J,vec_K,pnt_obj("cube",8),Obs_dist,90);
beginfig(168);
draw_obj("cube");
endfig;
% Dimetric projection
dimetric_projection(vec_I,vec_J,vec_K,0.5,pnt_obj("cube",8),3*Obs_dist,90);
beginfig(169);
draw_obj("cube");
endfig;
end.
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