如今，3D應用程式的使用變得越來越普遍，許多人也更願意親近3D應用程式。然而，3D環境下的人機互動關係還存在一些問題。特別是在直接互動中，人們直接與3D物件互動通常感到困難。因此，本研究觀察在立體實境下，人與水平選單直接互動的表現。在這個研究中，共測量五項變數：移動時間、表現、準確性、修正時間和尖峰速度。在本研究實驗共考量兩種環境因素、三種深度和三種難度指標。本實驗共招募12名眼睛狀態正常的自願參加者。結果顯示，在現實中直接互動的表現比立體環境好。在立體環境中，參與者的執行時間更長，速度更慢；深度變化不會顯著影響其他變數，除外準確性。它解釋參與者可以在不同深度中互動。本研究結果可作為立體環境下發展水平選單設計的重要參考，也有助於改善未來3D應用程式的直接互動方式。

Nowadays 3D application usage become more popular. Many people are becoming intimate with the use of 3D application. However, there are still some problem with the interaction in 3D environment. Especially in direct interaction, people usually feel difficulty when they interact with 3D object directly. Therefore, this study observe interaction performance on hierarchal menu design in the real and stereoscopic environment. This study using direct interaction technique to interact with the menu. In this study, five variables measured such as movement time, performance, accuracy, correction time and peak velocity. There were two kind of environment, three levels of depth and three index of difficulty that consider in this study experiment. This experiment recruit 12 voluntary participants with normal eyes condition. The result in this study show direct interaction performance better in real environment than in stereoscopic environment. In the stereoscopic environment, participant perform longer time and slower than in real environment. Levels of depth not give significant value almost in all variable except accuracy. It explain participant can perform in each levels of depth. The finding of this study can be important aspect to be consider for development in hierarchical menu design in 3D stereoscopic environment. This study also can contribute to improve direct interaction in future 3D application.

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