Plane.Raycast Example.

Unity Engine
1

Does anyone anyone have an example of Plane.Raycast?

^^ Not much in the way of documentation for it :slight_smile:

Thanks.

2

I realize this answer is quite late. I was looking for the same thing as the original poster and had to do some studying… If there are other people searching for this answer sometime, here is a small example I hope will help :slight_smile:

var plane : Plane = new Plane(Vector3.up, Vector3.zero);;

function LateUpdate()
{
	if (Input.GetMouseButton(0))
	{
		var ray = Camera.main.ScreenPointToRay(Input.mousePosition);

		var ent : float = 100.0;
		if (plane.Raycast(ray, ent))
		{
			Debug.Log("Plane Raycast hit at distance: " + ent);
			var hitPoint = ray.GetPoint(ent);
			
			var go = GameObject.CreatePrimitive(PrimitiveType.Cube);
			go.transform.position = hitPoint;
			Debug.DrawRay (ray.origin, ray.direction * ent, Color.green);
		}
		else
			Debug.DrawRay (ray.origin, ray.direction * 10, Color.red);

	}
}
1 Like
3

better late than never!

4

Definitely- I found this really useful, thanks so much. Use: isometric strategy game, building placement.

5

Works great, thanks…

One thing, there’s no need to define ent, just declare it. Raycast() will set it for you and that 100.0 is just getting overwritten…

Cheers

6

Thanks a Million. Finally figured this out with my camera being rotated. here is my solution

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Tilemaps;
public class MouseCursor : MonoBehaviour
{
    Plane plane;
    public LoadGrid loadGrid;
    Vector3Int ClickedTile;
    public Tiledata tiledata;
    private void Start()
    {
        plane = new Plane(loadGrid.transform.up, Vector3.zero);//camera is on an angle so the plane must use the same up as the ground in my case a tileMapgrid
    }
    void Update()
    {
        if (Input.GetMouseButtonUp(0))
        {
            var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            float ent;
            if (plane.Raycast(ray, out ent)) //gets the hitpoint on the plane
            {
             
                var hitPoint = ray.GetPoint(ent);
                hitPoint.z = hitPoint.z - 0.5f;  //was off by .5
             
             
                ClickedTile = loadGrid.TopTileMap.WorldToCell(new Vector3(hitPoint.x,0,hitPoint.z)); //the clicked tile
                Vector3 temp = loadGrid.TopTileMap.CellToWorld(ClickedTile); //convert back to move cursor to position
                this.transform.position = new Vector3(temp.x, 0, temp.z + 0.5f); //move the cursor... was also off by 0.5f
                tiledata = loadGrid.GetTilePoint(new Vector2Int(ClickedTile.x, ClickedTile.y), loadGrid.DefaultNoiseSettings); //returns data about the selected tile
            }
         
        }
    }
}