Version: 2017.4
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Camera.ScreenToViewportPoint

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public method ScreenToViewportPoint(position: Vector3): Vector3;
public Vector3 ScreenToViewportPoint(Vector3 position);

Description

Transforms position from screen space into viewport space.

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.

Viewport space is normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1). The z position is in world units from the camera.

#pragma strict
public class Example extends MonoBehaviour {
	function Update() {
		transform.position = Camera.main.ScreenToViewportPoint(Input.mousePosition);
	}
}
using UnityEngine;

public class Example : MonoBehaviour { void Update() { transform.position = Camera.main.ScreenToViewportPoint(Input.mousePosition); } }