public override Composite MakeComposite()
{
Composite composite = new Composite();
composite.AddRenderingGroup(new SimRenderer.SimRenderingGroup(2, new List <int>()));
composite.AddRenderingGroup(new SimRenderer.SimRenderingGroup(0, new List <int>()));
composite.AddRenderingGroup(new SimRenderer.SimRenderingGroup(1, new List <int>()));
Particle root = new Particle(Vector2.zero, particleDamping);
// composite.renderingGroups[1].indices.Add(composite.elemNum);
composite.AddSimElement(new PinConstraint(root));
Particle next = MakeLimb(composite, root, 1f, Mathf.PI * 0.5f);
composite.AddSimElement(new PinConstraint(next));
return(composite);
}