How do I create an object at the position where I click on screen?

Steve_Ince

I have a close up of the surface of a pond and want to play a short sprite animation of a ripple on the surface at the point where I click.  Unfortunately, I can't work out how to do this.  I can get the ripple to appear every time I click but it always appears in the same place and not at the cursor position.

Any suggestions?

ChrisIceBox

You'll need a custom script.  This isn't AC-related, and the Unity forums/documentation are a better resource for this kind of question.

The mouse position can be read with:

Input.mousePosition

To convert it to a world position, use:

Vector3 worldPosition = Camera.main.ScreenToWorldPoint (Input.mousePosition);

You can then position the ripple according to that with e.g.:

myRippleGameObject.transform.position = worldPosition;

You can combine the spawning/positioning code with AC to easily limit the region that the ripples appear, e.g. only when clicking on a Hotspot.  This is done by using the OnHotspotInteract event - see the "Custom events" chapter of the Manual for more on how they work.  This event can be used to check if the player clicked on a Hotspot that represents the pond, and only then spawns the ripple.

Steve_Ince

Okay, thanks.  I'll take a look at all that.

Steve_Ince

Thanks for the help, Chris, but I've taken a look and think the scripting is out of my skill zone for the moment.

Maybe I could emulate what I need by covering the pond surface with lots of small hotspots.  

ChrisIceBox

using UnityEngine;
using System.Collections;
using AC;

public class PondEvent : MonoBehaviour
{

    public Hotspot pondHotspot;


    private void OnEnable ()
    {
        EventManager.OnHotspotInteract += OnClickHotspot;
    }
    
    
    private void OnDisable ()
    {
        EventManager.OnHotspotInteract -= OnClickHotspot;
    }


    private void OnClickHotspot (Hotspot hotspot, AC.Button button)
    {
        if (hotspot == pondHotspot)
        {
            Debug.Log ("The pond was clicked on!");
        }
    }

}

cnppncnpc

It's not complex .

using UnityEngine;

using AC;

public class Ripple : MonoBehaviour {

    public Hotspot hotspot;

    public GameObject myRippleGameObject;

    public float lifeTime;

    private void Awake()

    {

        EventManager.OnHotspotInteract += RippleAppear;

    }

    public void RippleAppear(Hotspot hotspot,Button button)

    {

        if (hotspot == this.hotspot && button == hotspot.GetFirstUseButton()) 

        {

            Vector3 worldPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

            worldPosition.z = hotspot.transform.position.z;

            GameObject go = Instantiate(myRippleGameObject);

            go.transform.position = worldPosition;

            Destroy(go, lifeTime);

        }

    }

    private void OnDestroy()

    {

        EventManager.OnHotspotInteract -= RippleAppear;

    }

}

Drag your pond Hotspot and ripple GameObject into the inspector,and set a lifetime of the ripple.

Steve_Ince

Many thanks to both of you for doing these examples but it's still a little over my head, unfortunately.  

cnppncnpc

1.Create a C# script and rename it "Ripple.cs",then paste all my codes into it.

2.Select one of the GameObject in your scene and add a "Ripple" component to it.

3.Drag your pond Hotspot into the "hotspot" box.

4.Drag your "ripple prefab"(may be a sprite) into the "myRippleGameObject" box.

5.Set a lifetime of the ripple.

6.Now when you click your pond Hotspot,a ripple will appear.

Steve_Ince

Thanks for the further help.  I have two (possibly stupid) further questions.

Can I create the C# script anywhere?

How on earth do I edit the file in order to paste in the code?

ChrisIceBox

You can right-click in the Project window to create new C# scripts.  They should have the same name as the class - "Ripple" in @cnppncnpc's case.  Files can be edited by double-clicking them.

cnppncnpc

You can create a script anywhere in your project,to do this, right click on the project window,choose "Create - C# Script",and then rename it to "Ripple".

After creating the C# script,you can double click to open and edit it.

Steve_Ince

I double click it and nothing happens.

Steve_Ince

I found the file in the relevant directory and opened it using Wordpad.  Will try to get it working now.

Steve_Ince

Thank you so much.  It now works splendidly. 

Steve_Ince

If you're interested, here's my little interactive vignette.

http://www.storyinteractive.co.uk/SecretPoolWeb/index.html