I need help with raycasting

I want to find the exact position my raycast hit the terrain, but when i did some testing (placing objects where the raycast points), it seemed like they dont go where my crosshair is.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class Raycasting : MonoBehaviour {
7.  
8.     public Vector3 pos;
9.     public Camera camera;
10.     public float MaxDistance = 10;
11.  
12.  
13.     // Use this for initialization
14.     void Start () {
15.      
16.     }
17.  
18.     // Update is called once per frame
19.     void Update () {
20.         Ray ray = camera.ScreenPointToRay(Input.mousePosition);
21.         RaycastHit hit;
22.         if(Physics.Raycast(ray,out hit,MaxDistance)) {
23.             print(hit.point);
24.             pos = hit.point;
25.         }
26.     }
27. }

 

If you are using the pos calculated above in line 24 to set an object's position (i.e., in another script than this one) then they should be at the point of contact of the ray with the collider.

If the collider does not match the visible mesh, that could cause a problem.

If your prefab or model does not have its zero where you think it should be, that could cause a problem too.

Put a breakpoint on line 24, see what the value is, then see what the value is in the Unity editor on that emplaced object.

 

So, what you are saying is to compare the print with the position of the object? I have the object being created in another script with the position pos. I will breakpoint line 24 and see what happens.

 

You can also change the code temporarily to only do the raycast when you click on the mouse, then use Debug.Log() to output the value of pos, and compare it to where the GameObject appears to be in the editor after that.

 

alright, i stared right at the ground, raycast says i was looking at 325.2, 126.2, 169.7

The game object appeared at 325.64, 126.2, 170.7. And if im trying to place something up close, that is actually a large distance. it goes to the right of the screen (cant really see it)

 

Neat! You have gained intel!

Now... what next?

How about: What happens when you replace your spawned object with a single blank gameobject prefab and spawn that instead? Where does it go? Something is moving that GameObject off the original position so might as well make a brand-new game Object with nothing on it and see what happens!

 

Instead of my normal object, i set it as an "empty" gameobject. The empty gameobject was very accurate, only by a few decimal places off.

 

oh, and here is the code for the other script:

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class TreeGrowth : MonoBehaviour {
6.  
7.     Animator anim;
8.     public Rigidbody rb;
9.     public MeshCollider mc;
10.  
11.     void Start (){
12.         anim = GetComponent<Animator>(); // An animation makes the tree grow
13.         StartCoroutine(Timer());
14.      
15.     }
16.  
17.     IEnumerator Timer()
18.     {
19.         print(Time.time);
20.         yield return new WaitForSeconds(90); // wait 90 seconds for the tree to grow, so it has the proper tag to be chopped down with an axe
21.         print(Time.time);
22.         gameObject.tag = "Tree";
23.     }
24.  
25.  
26.     void OnTriggerEnter (Collider col){
27.         if(col.gameObject.tag != "Player") { // So it doesnt freeze on the player
28.             rb.constraints = RigidbodyConstraints.FreezePositionY | RigidbodyConstraints.FreezePositionX | RigidbodyConstraints.FreezePositionZ | RigidbodyConstraints.FreezeRotationY | RigidbodyConstraints.FreezeRotationZ | RigidbodyConstraints.FreezeRotationX;
29.          
30.         }
31.     }
32. }

The RigidbodyConstraints.Freeze are so the tree wont move, so if it spawns in the air, it can fall back to the earth and freeze its pos.

Also, the animation doesn't move it, i just ran a test

 

Also, here is where the instantiate command happens:

Code (CSharp):

1.  
2. if(currentSelection == 2) { // making sure the object is selected in the inventory
3.             if(Input.GetKeyDown(KeyCode.Mouse1) && saplings != 0) {
4.                     Instantiate(saplingObject,placePos,Quaternion.identity);
5.                     saplings--; // takes away a sapling (so u cant use it infinitely)
6.             }
7.         }

I checked to see if the placePos was any different from the pos in the other script. it wasnt