How can aim raycast at mouse position (x axis)

Unity Engine
1

Title says it all :3
Thanks in advance :stuck_out_tongue:

2 
RaycastHit hitInfo;
if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hitInfo))
{
    // Ray hit something in scene
    Debug.Log("Ray hit : " + hitInfo.collider.gameObject.name);
}
3

How can i also Debug the ray? and can i limit the range?
Btw, it’s a 2d game, moving on x axis… so i don’t need it to shoot behind or in front :stuck_out_tongue:

4

Yes you can limit the range. You can set a max distance to cast to, and even specify a specific object Layer to check collisions against.

The docs are your friend! Unity - Scripting API: Physics.Raycast

By “Debug the ray”, do you mean seeing the ray for debug purposes? Unity - Scripting API: Debug.DrawRay

5

static bool Raycast(Ray ray, RaycastHit hitInfo, float distance);

One possible overload which takes a distance as a parameter, so you can the code posted above and add a float value as a third parameter.

More information:
http://docs.unity3d.com/Documentation/ScriptReference/Physics.Raycast.html

6

Ok, got everything working fine, but there’s still one thing that doesn’t seem to be right, is there a offset? because the ray is not aiming at the mouse and doesn’t move at the same way/speed…

7

Sometimes it appears to be the same for me but i think that’s because it’s called every frame in this example.
Try to limit it to a KeyDown event and test whether it’s accurate or not.

8

I did the debug after a button is pressed, and still the same results…

I’m using this code tho

if (Physics.Raycast (transform.posistion, Input.mousePosition, hit, wepRange)) {
				if(hit.collider.gameObject.layer != 3)
				switch(hit.collider.gameObject.tag) {
					case("Zombie"):
						hit.collider.gameObject.GetComponent(HitBox).localDmg = totalDmg;
						Instantiate(hitBlood, hit.point, transform.rotation);
					break;
					default:
						return;
					break;
				}
			}

'cause with this

if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hitInfo))

It didn’t dedect the zombie :stuck_out_tongue:

and this is how off the ray can get,
(red dot is where the mouse was)

9

You’re currently using a screen position vector (Input.mousePosition) as a direction vector for the ray. ie. you’re casting a ray from I presume the position of your running man, in the direction of something like Vector3( 60, 100, 0), which is why your ray is firing off up and right of your player.

You need to convert the mousePosition into a position relative to your game scene, using

Vector3 mouseScenePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

Then find the direction vector from your running dude to that mouse scene position, and use it as the direction vector in your RayCast call.

// put the mouse click scene position to be the same z-depth as your character
mouseScenePosition = new Vector3(mouseScenePosition.x, mouseScenePosition.y, transform.position.z);

Vector3 shotDirectionVector = mouseScenePosition - transform.position;

if (Physics.Raycast (transform.position, shotDirectionVector, hit, wepRange)) {                

}