public Particle(Point3d p, DifferentialGrowth simulation)
{
_simulation = simulation;
_p = p;
Index = _simulation.Particles.Count;
_simulation.Particles.Add(this);
}
public Spring(Particle start, Particle end, int i, DifferentialGrowth simulation)
{
Start = start;
End = end;
_simulation = simulation;
start.Neighbours[1] = end;
end.Neighbours[0] = start;
Update();
_restLength = Length;
simulation.Springs.Insert(i, this);
}