copyFrom method
Copy the other
frustum into this.
Implementation
void copyFrom(Frustum other) {
_plane0.copyFrom(other._plane0);
_plane1.copyFrom(other._plane1);
_plane2.copyFrom(other._plane2);
_plane3.copyFrom(other._plane3);
_plane4.copyFrom(other._plane4);
_plane5.copyFrom(other._plane5);
}