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

Questions & Answers
1

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 :
48773-cap2.jpg

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 :slight_smile:
And sorry for my bad english.

2

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"); 
			} 
		}
	}
}