Instantiate a cube prefab and snap it to another (c#)..

Question

Hi everyone, I'm creating a 3D platformer and i'm stuck with one of my scripts. In my game the player can remove and place objects (Cubes actually). So far I managed to make the player remove the right cubes but I just don't see how to make the player to place a cube next to another one (snap it) when clicking on the face (something like minecraft snapping).

I searched and found a lot of things regarding how to build some minecraft gameplay but I never managed to make it work in my game.

There are 3 types of cube in my game :

Green: They are "Level cube" and cannot be removed but we can snap other cubes to them

Red : They are "Weak cubes" the can be removed and we can snap cubes to them

Blue : They are the "Player cubes" they can be placed and removed

For now i'm abble to remove red and blue cubes, but when i try to place a blue cube next to another one it goes right at the place of the cube i clicked on, i'm not sure if I explain that clearly what it does is that : alt text

The 2 cubes are in the same place.(it does the same thing with de green cubes)

I tried to use a grid and layermasks (as found in one of the subjects about minecraft stuff in unityAnswer) but it didn't worked (the cube was instantiated far from where i clicked)

I'm quite lost here if someone could help me that would be awesome !

Here is my code so far :

     public float Range = 10.0f;
     public GameObject Cube;
 
     
     void Update() 
     {
         if (Input.GetMouseButtonDown(1))
         {
             RaycastHit hitPoint;
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); 
 
             if(Physics.Raycast(ray, out hitPoint, Mathf.Infinity))
             {
                 if(hitPoint.collider.tag == "PlayerCube" && (hitPoint.distance <= Range))
                 {
                     Destroy(hitPoint.collider.gameObject);
                     Debug.Log("Hit/Removed PlayerCube"); 
                 }
         
                     
                 if(hitPoint.collider.tag == "LevelCube" && (hitPoint.distance <= Range))
                 {
                     Debug.Log("Hit/Can't Remove LevelCube"); 
                 }
 
                     
                 if(hitPoint.collider.tag == "WeakCube" && (hitPoint.distance <= Range))
                 {
                     Destroy(hitPoint.collider.gameObject);
                     Debug.Log("Hit/Removed WeakCube"); 
                     
                 }
             }
                 
             else
             {
                 Debug.Log ("No collider hit"); 
             }
         }
 
 
 
         if (Input.GetMouseButtonDown(0))
         {
             
             RaycastHit hitPoint;
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); 
 
             if(Physics.Raycast(ray, out hitPoint, Mathf.Infinity))
             {
                 if(hitPoint.distance <= Range)
                 {    
                     Instantiate(Cube, hitPoint.transform.position, Quaternion.identity);
                     Debug.Log("Placed a Cube"); 
                 }
 
             } 
         }
     }

Thanks for your help :) And sorry for my bad english.

Answer 1

Best Answer

Answer by TrainWrek · Jun 23, 2015 at 11:41 PM

Here is an example of placing a cube on the surface of another default cube.

 public class PlaceCube : MonoBehaviour {
     public float Range = 10f;
     public GameObject Cube;
 
     private void Update() {
         if (Input.GetMouseButtonDown(0)) {
             RaycastHit hitPoint;
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); 
             
             if (Physics.Raycast(ray, out hitPoint, Range)) {
                     Instantiate(Cube, hitPoint.normal + hitPoint.transform.position, hitPoint.transform.rotation);
                     Debug.Log("Placed a Cube"); 
             } 
         }
     }
 }

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$$anonymous$$ · Jun 24, 2015 at 02:05 PM 0

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Well I can't thank you enough ,you solved my problem, I just had to put x2 to the normal because my cubes are 2x2x2

Instantiate(Cube, (hitPoint.normal*2) + hitPoint.transform.position, hitPoint.transform.rotation);

It works perfectly, again, thanks :)

unity_mAOQG6kcIcXzjA · Aug 12, 2019 at 03:38 AM 0

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Works like a charm. Thank you!

Instantiate a cube prefab and snap it to another (c#)..

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