Drag and drop object (mouse to screen position)

Drag And Drop Unity

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DragAndDrop : MonoBehaviour {

	bool active = false;
	public Color selectedColour;
	public Color idleColour;

	void SetColour (Color c) {
		GetComponent<Renderer> ().material.color = c;
	}

	void OnMouseDown () {
		active = true;
		transform.eulerAngles = Vector3.zero;
		SetColour (selectedColour);
	}

	void OnMouseUp () {
		active = false;
		GetComponent<Rigidbody> ().velocity = Vector3.zero;
		GetComponent<Rigidbody> ().angularVelocity = Vector3.zero;
		SetColour (idleColour);
	}

	void Update () {

		if (active) {
			var v3 = new Vector3 (Input.mousePosition.x, Input.mousePosition.y, 10f);
			v3 = Camera.main.ScreenToWorldPoint (v3);
			transform.position = v3;
		}
	}
}