Research And Implementation Of A Model Conversion Plugin For Speedtree And OSG

Visualization of the forest industry has presented demanding requirements on the real sense of forest plant models and as a result, more details of such models will be demanded. In graphing of extensive forests, it has been a priority of researchers in this field how to coordinate fineness and graphing efficiency of plant models. In2010, an OpenSceneGraph (OSG) three-dimensional graphing based forest landscape visualization system was developed, yet to be improved in the feature of real sense of models, by College of Information, Beijing Forestry University. For the moment, the Speedtree software (V5.2) developed by the US IDV Company is a best choice when it comes to real sense and graphing efficiency of plants. Based on that software, graphing technologies of Speedtree have been introduced to import plant models from Speedtree to the OSG platform, with the aim to improve real sense and graphing efficiency of plant models in the visualization system of the forest industry.In this paper, firstly plant model graphing technologies of Speedtree and the graphing mechanism of OSG have been analyzed. Secondly, based on plant graphing technologies of Speedtree, graphing methods of Speedtree plant models in OSG have been discussed. Finally, it has been concluded that the method based on Speedtree software development package is the best way to import models from Speedtree into OSG Following theoretical study, a structured system development life cycle (S-SDLC) method is employed to develop a model conversion plugin for Speedtree and OSG based on the conclusion. Such plugin has imported the graphing features of Speedtree in their integrity, including geometrical models, texture chartlet, illumination, wind effect and a plurality of optimization techniques, which has improved real sense of the plant models and also ensured high graphing efficiency. The plugin cannot not only improve the visualization system developed by our college, but also exert great significance on visualization of the forest industry.