How do I instantiate certain objects to appear in a specific spot?

Question

Although the picture below is a little glitchy, I want to be able to instantiate those three cylinders after I click on the object onMouseDown. I want to be able to have those three cylinders in the exact position and alignment as on the object. How do I do that?

Also, how would I return to just the single main object (the tree) if I want to. I'm not sure how to implement something like that either.

Am I supposed to create prefabs and instantiate those?

Thanks!

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Answer 1

Best Answer

Answer by HappyMoo · Dec 31, 2013 at 09:03 PM

Build your hierarchy like this:

 Tree
   Cylinders
     Cylinder1
     Cylinder2
     Cylinder3

Then put a collider on the Tree. This will define what you can click. You get most precision if it's a mesh collider, but maybe a capsule collider is enough - you decide.

Cylinders is an empty gameObject(CTRL+SHIFT+N)

Then add the ClickSwitch MonoBehaviour to Tree and drag Cylinders in the obj reference and you're good to go.

 public class ClickSwitch : MonoBehaviour {
     public GameObject obj;
     void OnMouseDown() {
         obj.SetActive(!obj.activeSelf);
     }
 }

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Eowyn27 · Dec 31, 2013 at 09:55 PM 0

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That makes me think, how do I set only my gameobjects active= false then set them true when the user clicks on it?

Thanks.

HappyMoo · Dec 31, 2013 at 11:51 PM 0

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Can you specify exactly what you want? Click on the tree switches visibility of the cylinders?

Eowyn27 · Jan 01, 2014 at 12:37 AM 0

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yes exactly that.

Eowyn27 · Jan 02, 2014 at 03:33 AM 0

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I'm getting this error: Error CS1061: 'UnityEngine.Transform' does not contain a definition for 'setActive' and no extension method 'setActive' accepting a first argument of type 'UnityEngine.Transform' could be found (are you missing a using directive or an assembly reference?) (CS1061) (Assembly-CSharp)

JNetRocks1316 · Jan 02, 2014 at 03:34 AM 1

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You're getting that error because you don't enable the Transform, you enable the gameObject. change

public Transform obj; to public GameObject obj;

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Answer 2

Answer by DaveA · Dec 31, 2013 at 08:36 PM

I think you would use this:

http://docs.unity3d.com/Documentation/ScriptReference/Physics.Raycast.html

using one of the ones that returns the 'hit' information. That will contain the point at which the object was hit, and the normal at that point too in case you need it.

Prefabs are good. That way if you want to change what you are placing there you just change the prefab.

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Answer 3

Answer by J-R-Wood · Jan 26, 2014 at 07:47 PM

I think this is probably already answered, but if not. have you thought of doing like a instiate object on collision, and have that as the place to instiate at. or do a on collision and have that as the game object to setactive

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How do I instantiate certain objects to appear in a specific spot?

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