How to add a prefab as a trace in the place where the sphere bounces?

Question

C++ / C#

Please help write the code for this case. I know it's simple, but I don't know where to start.

Here is the link to the assets. There's a stage inside and a prefab trace.
https://onedrive.live.com/?authkey=%21AC03c9FLZ%2D...

Answer 1

Create a script to attach to the wall. What's on the sphere, what's on the wall in the Collider, turn on Is Trigger. There must also be a Rigidbody component in the sphere or wall. And don't forget to include the prefab. Here is the script:

public GameObject prefab;

    Collider obj;

    private bool onTrigger = false;

  void OnTriggerEnter(Collider other)
  {
        obj = other;
        onTrigger = true;
    }

  void FixedUpdate()
    {
        if (onTrigger == true) 
        {
            Instantiate(prefab, obj.gameObject.transform.position, Quaternion.identity);
            onTrigger = false;
        }


    }