Sandbox::https://github.com/GengineJS/Unity_Stage_Light/blob/master/RayPosition.cs

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using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class RayPosition : MonoBehaviour

{

private Camera mainCamera;

private Ray ray;

private RaycastHit hit;

private Vector3 mousePos, hitPosition;

public float radius = 11;

public float softness = 4;

public float moveSpeed = 15;

// Start is called before the first frame update

void Start()

{

mainCamera = this.GetComponent<Camera>();

}

// Update is called once per frame

void Update()

{

mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0);

ray = mainCamera.ScreenPointToRay(mousePos);

if (Physics.Raycast(ray, out hit)) {

hitPosition = Vector3.MoveTowards(hitPosition, hit.point, moveSpeed * Time.deltaTime);

Shader.SetGlobalVector("_Position", new Vector4(hitPosition.x, hitPosition.y, hitPosition.z, 1));

}

Shader.SetGlobalFloat("_Radius", this.radius);

Shader.SetGlobalFloat("_Softness", this.softness);

}