Here's the code I'm having problems with:
public class PlaneBehaviour : MonoBehaviour {
public GameObject ClickSymbol;
public void Update() {
if (Input.GetMouseButtonDown(0)) {
Instantiate(ClickSymbol, Input.mousePosition, Quaternion.identity);
}
}
}
When user clicks the left mouse button, then multiple ClickSymbol's will be instantiated. How to prevent that behavior (create the object only once) ?
As for the PlaneBehaviour script, it's attached to multiple (not intersecting, not overlapping) objects on a plane
That's what I thought you are doing and wanted to verify this before adding an answer. Joe's answer should work but this is a bad design.
You get the multiple Objects instead of one because the script is attached to multiple Objects.
The proper solution here is to have one script that reads from the Input then call a function or trigger an event in another script if required. Create a new script called InputReader or with similar name then move your if (Input.GetMouseButtonDown(0))... Make that that this new script is only attached to one GameObject. Just attach it to an empty GameObject. That's it.
It will prevent problems such as executing code twice when there is an input event.
Now, let;s say that you want to notify another script attached to another GameObject when key is pressed, you can find that GameObject, get that script that is attached to it then call its function.
GameObject obj = GameObject.Find("YourOtherObjectName");
Script script = obj.GetComponent<Script >();
script.notifyKeyPress();
I attached it to multiple game objects to be able to detect which game object was clicked
That's not how to detect which GameObject is clicked. Since this is a plane, I assume it is a 3D Object with a 3D collider. See 6.For 3D Object (Mesh Renderer/any 3D Collider) from my other post on how to do this.
