koobas.hobune.stream
Detect mouse click coordinates on terrain in C#
I'd like to detect the coordinates (x, y) on my terrain when the mouse is clicked.
I've tried searching Unity answers & Google for answers, but wasn't able to find something that worked. (Either it was in JS, or for an older version of Unity, or contained project-specific code that I don't have access to).
The context is I'm making a 2D isometric game and want to be able to right-click to move the character to a specific point.
I don't have a good conceptual grasp on Raycasts/Raycast semantics, so I'd prefer a specific code snippet if possible, rather than pseudocode.
Thanks!
The following code will move an object to the hit point on a terrain. To use:
Create a terrain
Create an object to place on the terrain
Attach the script to the object to place
Select the object to place in the hierarchy. Drag and drop the terrain onto the 'goTerrain' veriable in the inspector
Hit play and right mouse click on the terrain at the position you want to move the object.
using UnityEngine; using System.Collections;
public class TerrainHit : MonoBehaviour { public GameObject goTerrain;
void Update() { if (Input.GetMouseButtonDown (1)) { RaycastHit hit; Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (goTerrain.collider.Raycast (ray, out hit, Mathf.Infinity)) { transform.position = hit.point; } } } }
Note this code is a bit different that most of the Raycast() code you will find on UA. Most code uses Physics.Raycast(). This code use Collider.Raycast() so that it cast only against the terrain (which is what you indicated you needed in your question).
Object.collider (and with it, Terrain.collider, which just inherited the property) is deprecated as of 5.3.0. Use GetComponent<Collider>(), ins$$anonymous$$d.
Question: I attempted the following modified code, but I am having issue:
void Update () { if (Input.Get$$anonymous$$ouseButtonDown(0)) { Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (GetComponent().Raycast(ray, out hit, $$anonymous$$athf.Infinity)) { transform.position = hit.point; } } }
This seems to pause the game when clicking the left mouse button and does not return a hit.point value; any help is appreciated. Also, in absence of the goTerrain variable, I see no substitute.
Give yourself a goTerrain variable... There's no reason not to have one. You also need RaycastHit hit; somewhere in your code. Then you can do if (goTerrain.GetComponent<Collider>().Raycast(Ray, out hit, $$anonymous$$athf.Infinity)
ArtOfWarfare,
I actually didn't see the top of the code because of the formatting. I also noted the depreciation.
Thank you tons for your timely help!
-$$anonymous$$
And what if I want to detect where to go in every "terrain" type area? Can I use layers?
public class SomeClass : MonoBehaviour, IPointerClickHandler {
public void OnPointerClick(PointerEventData eventData) {
transform.position = eventData.pointerCurrentRaycast.worldPosition;
}
}
You should also attach Physics Raycaster component to your camera.
