e-learning is getting more and more popular. In certain situation classes need to show 3D stereographs to illustrate subjects, such as geographic or mathematics. Our study is to help teachers to create the 3D stereographs they need in an easy and intuitive way. ''3T in 3D'' is a 3D motion sensor teaching system. A motion sensor and with 3D technologies, 3D objects can be manipulated by teachers and students. In this way, students can easily to understand the complex 3D objects. This is a preliminary study on the applications of motion sensor with 3D technologies in e-learning. It is hope that the data gathered in this study will help to develop a more complete 3D -learning system.
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