Category : C Source Code
Archive   : IRITS.ZIP
Filename : AMBIGUIT.IRT

#
# The most common example of wireframe ambiguity. See for example:
# Geometric Modeling by Michael E. Mortenson, page 4...
#

save_res = resolution;
save_view = view_mat;

view_mat = view_mat * scale(vector(0.6, 0.6, 0.6)) * rotx(30) * roty(20);

A = box(vector(-0.5, -0.5, -0.55), 1.0, 1.0, 1.1);

resolution = 4; # To create 4 sided pyramids from cones...
C1 = cone(vector(0.0, 0.0, -0.6), vector(0.0, 0.0, 0.6), 0.6 * sqrt(2.0)) *
rotz(45);
C2 = cone(vector(0.0, 0.0, 0.6), vector(0.0, 0.0, -0.6), 0.6 * sqrt(2.0)) *
rotz(45);

A = A - C1 - C2;
free(C1);
free(C2);
view(list(A), 1);

B = box(vector(-0.3, -0.3, -1.0), 0.6, 0.6, 2.0);
C = A - B;
free(A);
free(B);

final = convex(C);
free(C);

beep(1000,100);
interact(list(final), 0);

mdump("ambiguit", view_mat);
gdump("ambiguit", final);
free(final);

view_mat = save_view;
resolution = save_res;