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The 3D model technology of virtual plant has been widely used in agricultural research fields. However, in most cases, the process of achieving the coordinate information of the plant and building the 3D model of the plant is done separately, so the error could not be analyzed directly. The purpose of this paper is to utilize VC++ and OpenGL to build up a real-time drawing system based on 3D movement tracker - Polhemus Fastrak. Using the method of combining programming of Microsoft Basic Class(MFC) and OpenGL to create drawing window and connect Polhemus Fastrak, the real-time drawing system has been made.
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