unity block raycast code example

Example 1: 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 2: Unity Raycast

using UnityEngine;public class ExampleClass : MonoBehaviour
{
    // See Order of Execution for Event Functions for information on FixedUpdate() and Update() related to physics queries
    void FixedUpdate()
    {
        Vector3 fwd = transform.TransformDirection(Vector3.forward);        if (Physics.Raycast(transform.position, fwd, 10))
            print("There is something in front of the object!");
    }
}

Example 3: unity ui block physics raycast

private bool IsOverUI(TouchState touch)
        {
            PointerEventData pointerData = new PointerEventData(EventSystem.current);
            pointerData.position = touch.position;

            List<RaycastResult> results = new List<RaycastResult>();
            EventSystem.current.RaycastAll(pointerData, results);

            if (results.Count > 0)
            {
                for (int i = 0; i < results.Count; i++)
                {
                    if (results[i].gameObject.GetComponent<CanvasRenderer>())
                    {
                        return true;
                    }
                }
            }

            return false;
        }