hit.point for rayhit not giving me what I'm looking for

Question

I have a camara up high (y=100) looking straight down toward a ground (100x100x5 cube). I'm drawing a visble ray to where I click on the box and the ray shows up just fine (image)

alt text

but no matter where I click I get

 (0.0, -5.6, 0.0)
 UnityEngine.Debug:Log(Object)
 Level:Update() (at Assets/Level.js:26)

Which blows my mind. Here's the code:

 #pragma strict
 
 var ballPrefab:Transform;
 private var ball:Transform;
 private var lastMousePos:Vector3;
 
 function Start () {
     ball = Instantiate(ballPrefab, 
                         transform.Find("ballStartSpawn").transform.position, 
                         Quaternion.identity);
 }
 
 function Update () {
     var ray:Ray;
     if(lastMousePos != null) {
         ray = Camera.main.ScreenPointToRay(lastMousePos);
         Debug.DrawRay(ray.origin, ray.direction * 130, Color.red);
     }
 
     if(Input.GetMouseButtonDown(0)){
         lastMousePos = Input.mousePosition;
         var hit:RaycastHit;
         ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         
         if(Physics.Raycast(ray.origin, -Vector3.up, hit)) {
             Debug.Log(hit.point);
         }
     }
 }

I just want to find out where my ray from the camera is touching the pink cubes collider. Should that be hit.point?

Answer 1

Best Answer

Answer by sdgd · Jan 25, 2013 at 08:48 PM

 if(Input.GetMouseButtonDown(0)){
 lastMousePos = Input.mousePosition;
 var hit:RaycastHit;
 ray = Camera.main.ScreenPointToRay(Input.mousePosition);
  
 if(Physics.Raycast(ray, out hit)) {
 Debug.Log(hit.point);
 }
 }

does this work?

I've coded this on the fly and don't know much of JS

but I've been trying to compare my provided C# code and yours

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jacksonkr · Jan 25, 2013 at 08:53 PM 0

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Hah, that was totally it. All I changed was my line 25 to look like yours. So small! $$anonymous$$any thanks for your help buddy. I'd +1 if I could. Not enough rep yet :/

sdgd · Jan 25, 2013 at 09:18 PM 0

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yeah I learned how to from Aldo Naletto

http://answers.unity3d.com/questions/382686/ray-destination-x-y-z.html

that code you saw is from him for me

and it's kinda is strange because of:

 (Physics.Raycast(ray, out hit))

out hit - witch gives to me no idea why it works

Answer 2

Answer by Wolfram · Jan 25, 2013 at 08:51 PM

Well, for the debug line you correctly compute the direction as ray.direction * 130, but for the raycast you use -Vector3.up, which is just straight down. The ray.origin is always (mostly) the same - a position very close to your camera (=on near clip plane), so just use ray.direction as direction, or as @sdgd suggested, just use the ray directly.

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hit.point for rayhit not giving me what I'm looking for

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