Unity3D: Spawning an object based on current position - putting onto canvas in same position

Question

I have an object which when it is destroyed it will leave something behind.

//Spawn object at point GameObject bonusDrop = (GameObject)Instantiate(bonusItem,target.transform.position, Quaternion.identity); //Set the transform to the canvas (without this line the position is correct) bonusDrop.transform.SetParent(canvas.transform); //object is completely off

I would like to set it to the canvas as it is intended as a UI element
The object ends up in the correct position if i dont set the parent (but if I don't set the parent the UI element won't work as intended).
I would love some help in trying to figure this out. I hate to say it but I feel the solution is simple and I can't get it =(

Eissa · Accepted Answer · 2015-10-03 21:25:14Z

1

Check out: http://docs.unity3d.com/ScriptReference/Transform.SetParent.html

You are having an issue with world space vs local space. Your GameObject bonusDrop, before setting its parent, exists in global space meaning that its transform is based on the global origin of (0,0).

When you set the parent, your bonusDrop GameObject transform becomes local to the parent GameObject's transform.

This means that bonusDrop's transform is looking at the parents transform as the origin.

The function SetParent() has a second parameter which may help you out with this issue.

If you still have trouble, then let me know.

answered Oct 3, 2015 at 21:25

Eissa

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3 Comments

Passy Over a year ago

Hey thanks for your response! I first tried the False setting to keep the position. The only thing is once I do that, It seems to spawn the prefab in its original position now (i.e. where it in the game scene). I then set it to True and no luck. Is it perhaps cause my item drop is a UI Button by any chance? (Basicaly I want the droppable to be a button to interact with).

Eissa Over a year ago

So by doing that, it spawns the prefab in the correct position? I am perhaps confused a little by what you are trying to do. Have you tried to perhaps create the button beforehand and leave it deactivated. Then at runtime when your object is destroyed have it activate the button and move it to the correct location?

Passy Over a year ago

Sorry I wasn't clear. Basically I'm trying spawn a UI element which acts as a pick up when an enemy dies. currently its a UI element button and when it spawns it goes into the bottom left corner of the screen everytime it is instantiated (spawned). Rather, I want it to spawn where the enemy died.

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