Version: 2018.2 (switch to 2018.3b or 2017.4)
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Camera.ScreenToViewportPoint

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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.

using UnityEngine;

public class Example : MonoBehaviour { // When attached to a GUITexture object, this will // move the texture around with the mouse.

void Update() { transform.position = Camera.main.ScreenToViewportPoint(Input.mousePosition); } }

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