Various object picking algorithms in Non Immersive Virtual World-A Report
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Abstract
This paper presents a method for picking up an indicated object in a Non Immersive Virtual environment. First the user should indicate a target object and provides the system with a task instruction on how to get it. The system acquires geometric information about the target object and constructs a Virtual environment model and the system finds a main point based on evaluation using the acquired information. An important and advantageous feature of this scheme is to perform the object picking task through simple clicking operations, and the user can execute the task without exact models of the target object and the environment being available in advance. A user study of these was performed which revealed their characteristics and deficiencies of objects in the non immersive virtual world, and led to the development of a new class of techniques. Object selection is a primary interaction technique which must be supported by any interactive three-dimensional virtual reality application. Although numerous techniques exist, few have been designed to support the selection of objects in dense target environments, or the selection of objects which are occluded from the user's viewpoint. We presented a limited understanding on how these important factors will affect selection performance hence to realize these operations it is necessary to use interaction techniques that would allow us to accomplish given type of interaction better and faster.
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Keywords: Non Immersive Virtual Environment, object picking, Pick ray, positioning, Pick sphere.
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