[Unity] Scale With Screen Size / Expand のCanvasのUIと同じ大きさに見えるようにObjectをScaleさせる

var referenceWidth = 1334;
var referenceHeight = 750;

var cam = Camera.main;

var resolutionAspect = (float)referenceWidth / referenceHeight;
var camAspect = cam.aspect;

var fov = cam.fieldOfView * Mathf.Deg2Rad * 0.5f;
if (resolutionAspect > camAspect)
{
    var hTan = Mathf.Tan(fov) / (1 / camAspect * resolutionAspect);
    fov = Mathf.Atan(hTan);
}

var distance = Vector3.Distance(transform.position, cam.transform.position);     
transform.localScale = Mathf.Sin(fov) * distance * Vector3.one;