unity raycast from mouse code example

Example 1: unity ray from mouse position

RaycastHit hit;
Ray ray = camera.ScreenPointToRay(Input.mousePosition);

if (Physics.Raycast(ray, out hit)) {
  Transform objectHit = hit.transform;

  // Do something with the object that was hit by the raycast.
}

Example 2: raycast unity

RaycastHit hit;
        // Does the ray intersect any objects excluding the player layer
        if (Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, Mathf.Infinity, layerMask))
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * hit.distance, Color.yellow);
            Debug.Log("Hit");
        }
        else
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * 1000, Color.white);
            Debug.Log("No Hit");
        }

Example 3: unity 2d raycast mouse

// detect object that was clicked using raycast

RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
 
if(hit.collider != null)
{
    Debug.Log ("Target name: " + hit.collider.name);
}

Example 4: unity raycast

void Update()
    {
        // Bit shift the index of the layer (8) to get a bit mask
        int layerMask = 1 << 8;

        // This would cast rays only against colliders in layer 8.
        // But instead we want to collide against everything except layer 8. The ~ operator does this, it inverts a bitmask.
        layerMask = ~layerMask;

        RaycastHit hit;
        // Does the ray intersect any objects excluding the player layer
        if (Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), out hit, Mathf.Infinity, layerMask))
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * hit.distance, Color.yellow);
            Debug.Log("Did Hit");
        }
        else
        {
            Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * 1000, Color.white);
            Debug.Log("Did not Hit");
        }
    }

Example 5: mouse click unity raycast unity

if ( Input.GetMouseButtonDown (0)){ 
   RaycastHit hit; 
   Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); 
   if ( Physics.Raycast (ray,out hit,100.0f)) {
     StartCoroutine(ScaleMe(hit.transform));
     Debug.Log("You selected the " + hit.transform.name); // ensure you picked right object
   }
 }