A Construction Method Study Of Middle School Physics Virtual Laboratory Based On Virtools

Middle school physics experiment is important for students to enhance their interest in science and popularize scientific knowledge. Visual Laboratory is one of the applications of visual reality technology in educational field. Though a virtual laboratory, the users can complete the whole experiments, and its results may be even better than in the real laboratory. Visual laboratory can effectively solve the problems of some schools lack of experimental equipments.This paper introduces the development of the virtual reality and virtual laboratory technology at first. Then the modeling technology of virtual reality is elaborated. The modeling technology include geometric modeling, motion modeling and physical construction modeling. Geometric modeling is used to describe the shape and appearance of virtual objects. Motion modeling is used to determine the movement and location of virtual objects in virtual world. Physical modeling is used to describe the physical properties of virtual objects.Several methods of virtual laboratory are described in this paper, and its advantages and disadvantages are compared though a list. Virtools has features that it can develop virtual laboratory simply, more importantly, Virtools has physical properties BBs. So Virtools is selected to construct middle school physics virtual laboratory in this paper. The three steps of constructing virtual laboratory are introduced; they are model construction, interactive design and virtual laboratories published.In this paper, a virtual horizontal projectile motion experiment is constructed using the method. The method is confirmed by the experiment. The virtual horizontal projectile motion experiment is divided to three parts. They are preview mode, test mode and self-drawn curve. The virtual horizontal projectile motion experiment is completely introduced by a large number of images.In this paper, the collision detection and several algorithms are introduced completely. The algorithms include AABB, OBB and Bounding Sphere. A contradiction between detection accuracy and running time is confirmed by a test. To solve the contradiction, an optimization method is proposed, this method uses VC++ and Virtools SDK. The optimization method is confirmed to resolve the contradiction by a test.