Abstract
It is very important to study and explore the application of virtual reality technology in landscape garden design, especially in the current environment of triple network integration and Internet of Things construction, to promote and facilitate the rapid development of digital landscape garden design in China. In this paper, we study the implementation method of virtual landscape gardening system and establish a virtual environment based on the ancient city of Yangcheng. On the computer platform, we study and realize a virtual roaming system of medium complexity with more complete roaming functions. Using the Quest3D software platform, a desktop-type virtual garden simulation system was developed, focusing on the virtual reality modeling technology method and virtual system implementation. The experimental results show that the GPU-accelerated drawing method based on GLSL can significantly improve the drawing frame rate of 3D garden landscape vegetation scenes with a small amount of scene data and has a certain feasibility. Based on the OpenSceneGraph (OSG) graphics rendering engine, the visualization of various types of 3D landscape models is realized, and the spatial layout of various types of landscape with parametric control is realized through digital vector layers, which flexibly manage and organize various garden elements and reasonably organize the spatial topological relationship between various types of landscape in 3D space. By integrating cross-platform ArcGISEngine components, the basic data of garden scenes including terrain data and vector data are managed. Through scene view cropping and hierarchical detail modeling technologies, the drawing efficiency and rendering real time of the garden landscape are improved. It realizes interactive 3D scene browsing and provides a six-degree-of-freedom all-round display of the overall landscape.
Highlights
As an important part of urban construction, landscape has multiple ecological, cultural, social, and aesthetic functions and is the carrier of artistic, ecological services and greening effects in urban development planning [1]
Immersive virtual reality is a new technology different from the original traditional three-dimensional scene browsing; its value for users is to dye all-round, unlimited 360° immersive scenes, so that users seem to be in the real scene and can freely browse, roam, and experience [14,15,16,17,18,19]. e virtual display of garden landscape can use immersive virtual reality technology to transcend the limitations of time and space, observe and appreciate the scientific and artistic nature of the overall landscape scheme, and make up for the lack of realistic information in the traditional three-dimensional landscape display, including the shading between the vegetation landscape, the overall spatial layout permeability, and the sensory impact of the topography undulations on the landscape [20]
When the initialization process of the virtual reality module is finished and the overall data information of the 3D garden scene is accepted, the spatial pose data of the user in the scene needs to be obtained as the basis of the virtual reality immersive scene construction. e Oculus device controls the virtual reality construction process through the environment pointer object OvrSession provided by the OculusSDK, and through the process control object, it obtains the preset user field of view (FieldofView, FOV) for both eyes of Yangcheng
Summary
As an important part of urban construction, landscape has multiple ecological, cultural, social, and aesthetic functions and is the carrier of artistic, ecological services and greening effects in urban development planning [1]. E virtual display of garden landscape can use immersive virtual reality technology to transcend the limitations of time and space, observe and appreciate the scientific and artistic nature of the overall landscape scheme, and make up for the lack of realistic information in the traditional three-dimensional landscape display, including the shading between the vegetation landscape, the overall spatial layout permeability, and the sensory impact of the topography undulations on the landscape [20]. As the vegetation (including trees, grasses, and flowers) model has the characteristics of complex structure and variety, building a more realistic 3D vegetation model and loading it in large quantities in the 3D scene increase the pressure of rendering the overall landscape of the 3D garden, and in the virtual reality display device, this contradiction is more undoubtedly magnified due to the dual-channel feature of virtual reality rendering (binocular field of view). The corresponding rendering optimization is carried out for the tree vegetation model with large data volume, and each module is integrated to realize the construction, organization, and virtual display of the 3D landscape as a whole
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