Unity 摄像机照再RawImg上

        public void Refresh()
        {
            if (!renderImage || !renderCamera) return;
            var rect = renderImage.rectTransform.rect;
            var w = (int)rect.width;
            var h = (int)rect.height;
            if (w == 0) w = Screen.width;
            if (h == 0) h = Screen.height;

            _renderTexture = RenderTexture.GetTemporary(w, h, 16, RenderTextureFormat.Default);
            // if (size == 0)
            // {
            //     size = 0.5f * h / DesignHeight;
            // }
            //
            // renderCamera.orthographicSize = size;

            renderImage.color = Color.white;
            renderCamera.backgroundColor = default;
            renderCamera.targetTexture = _renderTexture;
            renderImage.texture = _renderTexture;
            renderCamera.enabled = true;
        }