How to draw cyinlder on Mouse Click in unity

Questions & Answers
1

I am making a game. I just want that When user click on panel in play mode then add a cylinder at this place where mouse is clicked. Also I want to scale up that cylinder along with y vertices till the boundaries of panel.
How we can we do that?
Please Help me
I make cylinder in prefab and attach a script to the camera then assign Prefab object to that script but it is not working. where is the problem??
Code is here

using UnityEngine;
using System.Collections;

public class IntanciateObject : MonoBehaviour {
Ray ray;
RaycastHit hit;
public GameObject prefab;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
	ray=Camera.main.ScreenPointToRay(Input.mousePosition);
	
	if(Physics.Raycast(ray,out hit))
	{
		
		if(Input.GetKey(KeyCode.Mouse0))
		{
			GameObject obj=Instantiate(prefab,new Vector3(hit.point.x,hit.point.y,hit.point.z), Quaternion.identity) as GameObject;
			
		}
		
	}
	
	
	
}

}

2

Did you add a physics raycaster to your camera?

In addition, I find the structure of your Update() a bit odd, I would go more like this.

void Update () {
  if(Input.GetKey(KeyCode.Mouse0)){
    ray=Camera.main.SceenPointToRay(Input.mousePosition);
    if(Physics.Raycast(ray,out hit)){
      Transform obj=Instantiate(prefab, hit.point, Quaternion.identity);
    }
  }
}

This way your raycasting only happens when you actually press the mouse.

hit.point is already a vector3 so there’s no need to make a new one like that.

Also Instatiating your prefab as a Transform will work just fine, and it easier to read and less error prone then all that mucking about with unnecessary typecasting.

I also find it easier to read putting this type of thing in something like “OnPointerClick()” which would make your class look like this:

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class IntanciateObject : MonoBehaviour,IPointerClickHandler { 
public Transform prefab; 

  public void OnPointerClick(PointerEventData data){
    Instantiate(prefab, data.pointerPressRaycast.worldPosition, Quaternion.identity);
  }
}

You do still need the raycast component on your camera though. This approch also requires EventSystem and Input modules components (which I put on the camera too).