返回物体的自身坐标

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 public static Vector3 WorldToUI(GameObject a, Vector3 pos)
    {

        CanvasScaler scaler = a.GetComponentInChildren<CanvasScaler>();
        Canvas canv = a.GetComponentInChildren<Canvas>();
        float resolutionX = scaler.referenceResolution.x;

        float resolutionY = scaler.referenceResolution.y;

        Vector3 viewportPos = canv.worldCamera.WorldToViewportPoint(pos);

        Vector3 uiPos = new Vector3(viewportPos.x * resolutionX - resolutionX * 0.5f,

        viewportPos.y * resolutionY - resolutionY * 0.5f, 0);

        return uiPos;

    }

返回物体的自身坐标