Crowd simulation

Unity Engine
1

I have created a scene with a plane, a platform (4 X 0.25 X 4 box) in the origin and some capsules that run towards the origin (when they touch the origin they stop to move). But the capsule in the center start jump over the other capsules. How can I solve this problem?

public class Capsule : MonoBehaviour {

  bool touch;

  void Start() {
    transform.position=new Vector3(UnityEngine.Random.Range(-25.0f,+25.0f),1.0f,UnityEngine.Random.Range(-25.0f,+25.0f));	
    touch=false;
  }

  void FixedUpdate() {
    Vector2 p=new Vector2();
    if(!touch  Vector3.Distance(new Vector3(0.0f,rigidbody.position.y,0.0f),rigidbody.position)>0.5f) {
      p.x=rigidbody.position.x;
      p.y=rigidbody.position.z;
      p=p-p.normalized*4.0f*Time.fixedDeltaTime;
      rigidbody.MovePosition(new Vector3(p.x,rigidbody.position.y,p.y));
    }
    else {
      touch=true;
    }
  }

}
2

Are the capsules able to collide with other capsules? If they do, you are triggering collisions as lots of capsules tries to get to the same point, potentially getting inside each other - and the physics will try to push them away.

Also, if the capsule in the center is ‘another type’, and not supposed to move (it is there for collision detecting purposes only), try setting it as a trigger.