echo ' vertical cracks at +/- 5 degrees, excess=5% '
echo ' made by cracking a layer twice '
vcrack iso iso sillya excess=5
rotate sillya sillyb degz=10
vcrack sillyb iso sillyc excess=5
rotate sillyc ortho1 degz=-5     
display ortho1 | more
unvcrack iso ortho1 | more

echo ' vertical cracks at +/- 30 degrees, excess=5% '
echo ' made by cracking a layer twice '
vcrack iso iso sillya excess=5
rotate sillya sillyb degz=60
vcrack sillyb iso sillyc excess=5
rotate sillyc ortho2 degz=-30    
display ortho2 | more
unvcrack iso ortho2 | more

echo ' vertical cracks at +/- 30 degrees, excess=5% '
echo ' made by adding two cracked layers with excess of 10% '         
vcrack iso iso sillya excess=10
rotate sillya sillyb degz=30
rotate sillya sillyc degz=-30
combine sillyb sillyc ortho3     
display ortho3 | more
unvcrack iso ortho3 | more

Rm  silly*

