Hi.
First, I am new here, first post, just started with Unity and I am soooo amazed by it.
Second, I have a doubt 
I am trying to show a particle on every touch position on mobile. What I got after hours of google search is:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Menu : MonoBehaviour
{
public ParticleSystem emitter;
public void Update ()
{
if (Input.GetMouseButtonDown(0))
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
emitter.Play();
}
}
}
This is showing the Particle once in a fixed position (the original position the particle is in canvas).
I changed the Stop Action to Call Back and disabled Loop and Play on Awake in the Particle Inspectorā¦ so every time I click, it shows again.
Thanks for any help on this.
This is not surprising - after all, you are not changing the position of the particle System at all. If you want the particles to appear at a certain Location, you will need to Change its Position. Then again, I only see you Setting up a ray, which is half way through the way to determining the world Location of the touch. I recommend you finish that first, and then move the Emitter thereā¦
Thanks for the replyā¦ I am trying the documentation but without luck. One of the documentation I tried was this one: Unity - Scripting API: Touch.position but its giving me errorsā¦ I find it hard to get information from the source documentationā¦
Try this:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Menu : MonoBehaviour
{
public ParticleSystem emitter;
public float distFromCam=10; //distance of the emitter from the camera
public void Update ()
{
if (Input.GetMouseButtonDown(0))
{
Vector3 pos=Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, distFromCam));
emitter.transform.position=pos;
emitter.Play();
}
}
}
OMGā¦ Dudeā¦ YOU ROCKā¦
Thanks a lot,
I know this isn`t part of your asset and still you helped meā¦ amazingā¦
I will keep an eye on your stuff hereā¦
thanks again. 
Iām instantiating prefab GameObjects into my scene. Multiples of the same prefab. Does your touch setup allow for me to drag or rotate them individually. I have been trying to implement a different solution, that treats all of the prefabs as the same object, which is totally not what we want of course, and so I am looking for another solution to solve this.