LayerMask for RayCast

Questions & Answers
1

I have no idea why this isn’t working… if anyone can help me, I really appreciate it!

my script attached to my camera:

using UnityEngine;
using System.Collections;

public class placingObjectScript : MonoBehaviour 
{
	public bool treeSelected = true;
	public GameObject[] tree;

	void Update ()
	{
		if(Input.GetMouseButtonDown(0))
		{
			Ray ray;
			RaycastHit hit;
			ray = Camera.main.ScreenPointToRay(Input.mousePosition);

			if(Physics.Raycast(ray, out hit, 1 << 3))
			{
				if(treeSelected && hit.collider.tag == "placableGround")
				{
					Instantiate(tree[Random.Range (0, tree.Length)], hit.point, Quaternion.identity);
				}
			}
		}
	}
}

I have assigned everything to the default layer, and then the camera to Ingore Raycast.
The camera has a collider, and without using layers, the trees will spawn on the camera’s collider.

At the moment, when you click, nothing happens. It works when I get rid of the camera collider and the layer mask bit, but I really need a camera collider…

2

You’re putting the layerMask value where maxDistance is supposed to go. It’s also way easier to use a LayerMask popup to set the value in the inspector. And CompareTag is faster than comparing strings directly. See if this helps:

using UnityEngine;
using System.Collections;

public class placingObjectScript : MonoBehaviour 
{
	public LayerMask mask = -1;
	public bool treeSelected = true;
	public GameObject[] tree;
	
	void Update ()
	{
		if(Input.GetMouseButtonDown(0))
		{
			Ray ray;
			RaycastHit hit;
			ray = Camera.main.ScreenPointToRay(Input.mousePosition);
			
			if(Physics.Raycast(ray, out hit, Mathf.Infinity, mask.value))
			{
				if(treeSelected && hit.collider.CompareTag("placableGround"))
				{
					Instantiate(tree[Random.Range (0, tree.Length)], hit.point, Quaternion.identity);
				}
			}
		}
	}
}