Prevent Additional GameObjects from instatiation

Question

I am trying to prevent gameobjects from spawning more than once. I have 5 buttons, and each one holds a prefab. I only want the user to be able to place one of each.

   void OnMouseDown() {
     Vector2 rawPosition = CalculateWorldPointOfMouseClick();
     Vector2 roundedPosition = SnapToGrid(rawPosition);
     if (SnapOk(rawPosition) == true && CheckVacancy(rawPosition) == true) {
         Instantiate(Button.selectedShip, roundedPosition, Quaternion.identity);
     }
 }

I have tried all of the GameObject.Find* options to try and check if they are there, no dice. (I could be implementing it wrong.. who knows)

Answer 1

Answer by Bioinformatizer · Jan 31, 2016 at 12:11 PM

Use a bool for each of the items you want to limit.

 private bool ship1 = false;
 void OnMouseDown() {
      Vector2 rawPosition = CalculateWorldPointOfMouseClick();
      Vector2 roundedPosition = SnapToGrid(rawPosition);
      if (SnapOk(rawPosition) == true && CheckVacancy(rawPosition) == true) {
          if (!ship1){
              Instantiate(Button.selectedShip, roundedPosition, Quaternion.identity);
              ship1 = true;
          }
      }
  }

That way when you call the code the ship1 will be true and the next time you go to click the button it won't work because it is already true. Don't forget to make the ship1 false again if it gets destroyed etc.

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Prevent Additional GameObjects from instatiation

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