deepCopy method
Deep copy the object.
Implementation
Sp3dFragment deepCopy() {
List<Sp3dFace> f = [];
for (var i in faces) {
f.add(i.deepCopy());
}
return Sp3dFragment(f,
isParticle: isParticle,
r: r,
physics: physics != null ? physics!.deepCopy() : null,
isTouchable: isTouchable,
name: name,
option: option != null ? {...option!} : null);
}