CN110018742B - Construction method of network virtual travel system - Google Patents
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Abstract
The invention provides a construction method of a network virtual travel system, which comprises the following steps: firstly, creating a three-dimensional scene model of a tourist attraction; secondly, constructing a network virtual travel framework; and (III) designing a network virtual travel system. The method fully utilizes modern information technology, virtual reality technology and three-dimensional simulation technology, establishes a three-dimensional virtual scene of a tourist attraction based on three-dimensional modeling through simulation and realization of super-realistic scenes, constructs a virtual tourist environment and constructs a virtual tourist service platform, and realizes real-time simulation and interaction of complex scenes based on web pages. The virtual roaming mode of the tourist attraction is provided, so that tourists can browse scenery in a three-dimensional virtual environment without going out, and the public service level of the tourist attraction is effectively improved. Meanwhile, the online virtual tourism mode and path are explored, and a foundation is laid for realizing the virtual tourism development prospect in China.
Description
Technical Field
The invention relates to a construction method of a network virtual travel system, in particular to a construction method of a network virtual travel system, which fully utilizes modern information technology, virtual reality technology and three-dimensional simulation technology, establishes a three-dimensional virtual scene of a tourist attraction based on three-dimensional modeling through simulation and realization of super reality, constructs a virtual travel environment, constructs a virtual travel service platform and realizes real-time simulation and interaction of a complex scene based on web pages.
Background
The strong development of modern information technologies such as Internet, virtual reality, multimedia and visualization provides a foundation for the generation of virtual tourism. The characteristics and advantages of the virtual travel, such as presence, autonomy, overrunning spatiotemporal, multi-perceptibility, interactivity, economy, safety, and the like, are becoming a unique landscape in the travel industry because more and more people begin to pay attention to and enjoy the virtual travel.
With the development of information technology, virtual tourism is rapidly developed at home and abroad, and a plurality of virtual tourism systems are put into application at present, so that huge economic benefits are generated, and the virtual tourism systems are represented as follows: the platform constructs a large-scale, multi-person online 3D virtual world for a Second Life of a American forest laboratory, and tourists enable virtual agents to conduct automatic tour guide. The 3D virtual ancient Roman' deduced by google constructs a 3D building model, and the ancient Roman in the full bloom period is reproduced on the net. The cooperation of the palace and IBM develops a virtual cercis city The Virtual Forbidden City, builds a palace, cultural relics and task model, and virtually reproduces the royalty condition in the current year. The intelligent Lijiang 3D tourism platform developed by the tapestry company enables tourists to roam on line in Lijiang beauty.
The system adopts three-dimensional modeling, mapping and shadow lamp means to construct a 3D scene technically, utilizes a 3D engine to carry out scene, resource, role and animation management, dynamic loading and unloading of resources, view volume cutting and other technologies, has immersion, interactivity and conception, but has complex and time-consuming scene modeling, huge model data volume, needs downloading and installing a client during system operation, has higher requirements on the performance of a hardware platform, and does not support mobile terminal application.
In recent years, china has developed deeper research and practice in the aspect of virtual tourism, and the digital Dunhuang virtual roaming system solves the contradiction between utilization and protection, so that tourists do not enter a cave, and can enjoy exquisite wall paintings and colored plastics as well, and feel the drunk Dunhuang culture. The virtual Mingxiaoling system uses the virtual reality technology of the Germany Bitmanagerment company to provide a complete multi-user online tour interactive platform, and the existing buildings of the Nanjing Mingxiaoling, a world heritage are displayed in a digital mode.
At present, domestic research and development of some professional virtual tourism websites, such as: chinese panorama network, virtual hometown museum, double-maste han tomb scene, etc., and a three-dimensional experience website Mirror City built by capital and long sand, and a City8 of 24 domestic cities, etc. are opened. However, the mainstream implementation technology is mainly 360-degree panorama based on video images, and a comprehensive system and a service platform based on three-dimensional modeling are not available, and especially an autonomous travel mode based on virtual scenes is lacking.
Disclosure of Invention
In order to solve the problems, the invention provides a method for constructing a network virtual travel system, which fully utilizes the modern information technology, the virtual reality technology and the three-dimensional simulation technology, establishes a three-dimensional virtual scene of a tourist attraction based on three-dimensional modeling, constructs a virtual travel environment, constructs a virtual travel service platform and realizes real-time simulation and interaction of a complex scene based on web pages through the realization of simulation and super reality.
A construction method of a network virtual travel system comprises the following steps:
first, creating a three-dimensional scene model of a tourist attraction
Acquiring three-dimensional topographic data of a tourist attraction by using an aerial photograph oblique photography technology; the three-dimensional laser scanning technology is applied to collect data such as tourist attraction buildings, trees, vegetation, public facilities, service facilities and the like, and the three-dimensional topography data and the three-dimensional model data of the tourist attraction are synthesized to construct a virtual tourist three-dimensional scene;
(II) building a Web virtual travel framework
1. System architecture
The web virtual travel service system includes: information resource input, data acquisition and normalization processing, a data center, a core engine, three-dimensional visualization, application management, unified portals and the like; the overall architecture of the network virtual travel service system is shown in FIG. 1;
2. System business architecture
The system takes a three-dimensional engine as a core, and a three-dimensional panoramic live-action mixed reality technology and a three-dimensional modeling simulation technology are applied to construct a digital virtual scenic spot, so that a virtual tourism system based on the Internet and the mobile Internet is realized; the system foreground realizes terminal model rendering, virtual travel experience, travel three-dimensional navigation, voice introduction, user interaction and the like; the system background realizes model library management, virtual travel scene management, travel service platform management and the like; the three-dimensional engine platform realizes three-dimensional model management, three-dimensional scene management, camera management, memory management, animation management, user interaction and the like; the data interaction realizes various data interactions between the system and the user;
3. system function architecture
The system is a B/S architecture and consists of two parts of Internet foreground and background management; the Internet foreground is deployed on the public Internet, the external data interface supports microblog, weChat and APP, the client can support universal Windows/Android/iOS, the user data center can be deployed on the public Internet or an internal local area network, and the user can set related data to be public or private rights according to requirements;
model management: the system has the management functions of a three-dimensional scene, a facility model and the like of a tourist attraction;
Scene management: the method has the functions of loading, converting, scene organization design, camera hot spot position configuration, model grade display, memory loading and releasing and the like of a three-dimensional model;
content management: the system has the functions of scenic spot introduction, scenic spot cultural activity, service guide, passenger flow distribution, garden beard and the like in tourist attractions;
tour guide: the system has the functions of theme scenic spots, classical scenic spot introduction, hot spot recommendation, panoramic roaming, tourist route planning, scenic spot navigation, classical route tour, VR experience and the like;
virtual communities: has the functions of travel attack, travel group, my world, my collection, my group, my footprint and the like;
and (3) system management: the system mainly realizes the functions of user registration, login, user authority management, system menu management, system operation log record management and the like;
(III) network virtual tour system design
1. Information resource input system
Digitizing the data information data: processing various data of the tourist attraction by means of digital scanning, character input and the like to form digital document data;
three-dimensional scanning system: scanning buildings, cultural relics and various service facilities of the tourist attraction by utilizing a laser three-dimensional scanning technology to form corresponding point cloud data, and laying a data base for three-dimensional modeling of the tourist attraction;
Travel geographic information acquisition system: constructing a tourist attraction geographic information system, wherein the key point is correction of attraction coordinate points, and establishing an accurate coordinate system of the attraction, so as to lay a foundation for three-dimensional navigation of the attraction;
2. data acquisition and normalization
Data acquisition and normalization processing: normalizing the unstructured, semi-structured and structured data acquired and input;
3. data center
The data center is used for storing a large number of complex data types, managing various multimedia information through the data types and rules of external files, and providing adding, deleting and modifying functions for various information resources;
the mechanism of sub-fields, multi-value fields and variable length fields is adopted, so that a plurality of unstructured or arbitrarily formatted fields of different types are allowed to be created, a very strict table structure of a relational database is broken through, and unstructured data is stored and managed;
the unstructured data and the structured data are defined as storage units, so that the basic elements of the unstructured database are media files, various unstructured data can be stored and managed, and the conversion from system data management to content management is realized;
4. core engine
The network virtual travel platform operates based on the Internet and the mobile Internet, has large three-dimensional scene data volume, virtual roaming, virtual navigation and real-time three-dimensional scene man-machine interaction as basic functions, but by applying any engine technology, huge supporting environments need to be downloaded, different operating systems and browsers need to download plug-ins of different versions, different graphical program interfaces are called, and great limitation is brought to development of the system;
the core engine has a high-performance progressive transmission mechanism, so that scene and model data volume required to be preloaded, transmitted and cached during virtual scene roaming is minimized, tourists can smoothly roam in the virtual scene through multithread streaming loading, and the requirement on network bandwidth is minimized;
(1) Core engine structure
The virtual tourism special core engine developed based on WebGL mainly solves the problems of high precision, large data volume and low use efficiency of the virtual scene three-dimensional model on the Internet, PC terminals and mobile terminals; the engine can directly run through an Internet browser without installing any plug-in, and is suitable for PC and mobile phone terminals; the engine is composed of an API interface layer, a logic control layer and an application interface layer, and the main functional modules are as follows: model control, model loading, collision detection, scene management, memory management, camera control and the like;
The method comprises the steps of realizing an engine bottom architecture and design based on a class library, a programming interface and a GIS geographic information system data interface provided by WebGL; in addition, the engine is internally provided with a plurality of three-dimensional scenes, models such as: three-dimensional models such as buildings, cultural relics, lake water, four-season trees, compasses, sky boxes and the like;
the logic control mainly realizes functions of camera position and visual field management and control, scene position control, camera physical collision detection, three-dimensional scene, model hierarchical loading management, scene switching management, navigation and navigation management, GIS geographic information system management, memory loading and releasing management and the like;
the application interface mainly realizes functions of hot spot switching, automatic roaming, manual navigation, position service, map service, scene switching, navigation and camera direction and direction display;
(2) Key technology
Progressive download design of virtual scenes: the contradiction between large virtual travel scene, more building and tree models and large data volume and the storage space of a user side is more obvious in the mobile terminal with small storage space, in order to solve the contradiction, a progressive downloading mechanism is adopted for real-time roaming travel of the virtual scene, multi-resolution hierarchical modeling is firstly carried out on the models, and then model data with different resolutions are downloaded as required according to factors such as the distance between an object and a view point, the deviation angle between the object and a sight line and the like, and the roaming visual effect is not reduced, so that network delay of scene downloading is reduced;
The light weight treatment technology comprises the following steps: due to the limitation of internet speed and bandwidth, the instant downloading of (super) large-scale WebVR virtual scenes and three-dimensional models on the internet is always a bottleneck problem; the virtual tour scene constructed by the three-dimensional model is smoothly played on the Web page, the number of patches and textures of the scene are required to be reduced, and a reuse mechanism is adopted to manufacture a scene model; 3D roaming of the virtual scene is realized according to the lightweight modeling, webVR script programming, background management and support architecture and lightweight engine scheduling technology; the plug-in-free simulation engine technology based on WebGL is designed to efficiently schedule scenes of millions of patches, so that virtual roaming experience of users on the network becomes smoother;
intelligent caching technology: the caching technology is a means for providing the most effective three-dimensional performance of the mobile intelligent terminal, the simulation engine divides the network three-dimensional information service system into a plurality of independent physical layers, a multi-layer caching mechanism can be effectively realized, and an efficient caching system frame is built; the three-dimensional model information data prefetching mechanism is adopted, partial data are acquired from database service in advance and stored in a memory, so that the number of times of accessing a three-dimensional space database by a three-dimensional service component is reduced, three-dimensional elements close to the three-dimensional space can be rapidly extracted in batches by utilizing the SQL query operation of the relational database, and the database is prevented from being accessed for multiple times; network front-end caching: gradually acquiring data with a certain scale, splicing the data at the client, and caching the once accessed regional data at the local of the client, so that the network transmission quantity and the interaction times between networks are reduced;
Progressive downloading and transmission mechanism of large-scale three-dimensional virtual scene: the three-dimensional engine can judge according to the viewpoint distance of a user by using a layered LOD loading mode, so that different models and maps are loaded, and the model level is divided into three levels LOD1 LOD2 LOD3 according to the number of model grids; model mapping is 1024x1024 512x512 256x256 at the same time; if the user viewpoint distance is higher than 10m, the model calls lod3 texture mapping and 256x256 size texture; therefore, more models can be loaded more quickly by using the models with low grid number and small materials;
5. three-dimensional visualization and application management
The three-dimensional visualization and application management mainly realize virtual tour guide display, leisure and entertainment based on three-dimensional scenes, and dynamic loading management of consumption services and information (characters, pictures, videos, three-dimensional scenes and the like) around tourist attractions; mainly solves the problems of rapid loading of a three-dimensional scene and a three-dimensional model, roaming of the three-dimensional scene and the like;
(1) Three-dimensional model loading strategy
The three-dimensional model comprises geometric body information, connection information and attribute information, wherein the geometric body and the connected characteristics of the three-dimensional model are extracted, an algorithm for progressively compressing the geometric body and the connection information is adopted, and the three-dimensional model data stored at a server side are effectively compressed by combining with an attribute compression algorithm of textures, precision, coordinates and the like; establishing a three-dimensional scene and model attribute identification codes on the basis of geometry, connection and attribute extraction, and realizing quick retrieval and transmission of the model; in order to ensure the correctness of data transmission of each client and prevent repeated transmission of data, normalizing the data at a server end and ensuring the rapid and effective loading of a three-dimensional scene and a model;
(2) Three-dimensional roaming
Setting a scene loading trigger switch in a roaming scene by means of a roaming time axis, and loading a model of the next scene in the route by the roaming camera once triggering the loading switch in the scene, wherein rendering is not performed after loading is completed; the rendering model does not occupy the running memory of the system; touching the rendering trigger switch when the current scene is roamed is finished, and rendering the next scene by the rendering user without waiting for the next scene to be roamed;
three-dimensional model preview:
three-dimensional model preview flow, the engine user background configures the model preview related information and saves to a database, such as: model preview trigger path, preview model path, etc. When the three-dimensional program is initialized, the related data of the model preview is requested from the background, and the data is transmitted to the three-dimensional engine for related initialization of the model preview; triggering model preview by a user through UI operation or mouse, keyboard operation and the like, initializing a model preview scene by a three-dimensional engine according to related information contained in a triggering event, loading the preview model, returning the scene to a three-dimensional program to repeatedly render the scene after the model is loaded, and generating an interface of the omnibearing and multi-angle preview model for the program user to preview;
Regional automatic roaming:
the method comprises the steps of an area automatic roaming flow, wherein an engine user configures the position of an automatic roaming key point camera and the orientation of the camera when the position is set through a background, and stores the position and the orientation of the camera in a database; when the three-dimensional program is initialized, acquiring the related data of automatic roaming from the background and initializing an automatic roaming module; the program user sends a request for starting automatic roaming through the UI, and the three-dimensional engine starts automatic roaming after receiving the request;
switching between optimization areas:
zone-to-zone handoff flow profile: setting information such as picture introduction, text introduction and the like of each region by an engine user through a background, storing the information into a database, switching the region through UI operation by the user, requesting related information of the region from the background, requesting a model loading progress by a three-dimensional engine, and displaying the model loading progress in real time; completing model loading, and jumping the camera to the area;
optimizing map switching scenes:
the map is switched to the three-dimensional scene flow profile: setting related information such as picture introduction and text introduction of scenic spots by an engine user through a background, storing the related information into a database, clicking the scenic spots on a map by the user, acquiring the information of the scenic spots by a map module, and feeding back the information to a three-dimensional program; the three-dimensional program requests picture introduction, text introduction and model data corresponding to the hot scenic spot, the model loading is completed, and the hot scenic spot is entered;
6. Unified portal
The system unified portal comprises a unified data center and a unified user interface, displays and publishes the virtual travel system through a WEB/WAP website, can be linked with a third party service platform, and supports Android and iOS system applications.
(1) Unified portal system
The unified portal adopts an SOA architecture and is designed according to a four-layer structure, and comprises a data layer, a platform layer, a service layer and an application layer;
A. data layer: includes four types of data
Basic geographic information data: the multi-scale geographic information data necessary for the information such as the geographic position, the overall layout, the scenic spot planning, the scenic spot distribution and the like of the tourist attraction comprises the geographic element data such as scenic spot regions, tourist roads and the like stored in a vector format and the data such as remote sensing images, digital ground models and the like stored in a grid format;
three-dimensional model data: the three-dimensional model data mainly comprises geometric models and texture data of a virtual tourist attraction three-dimensional scene, attraction scenic spots, various facilities and the like, wherein the geometric models support various commercial or general data formats such as 3ds, obj, OSG and IVE and the like, and the textures support various general image data formats such as BMP, JPG, PNG and TGA and the like;
multimedia data: the method comprises the steps of introducing various multimedia data in detail of tourist attractions, and supporting a WMA, WAV, AVI, FLA video-audio file format and an HTML webpage data format besides the general image data format;
Tourist attraction information: the method comprises the steps of internally managing application data, and introducing various multimedia data including general images, video and audio and webpage formats in detail to scenic spots served by the outside;
B. platform layer: the platform layer is a core of system realization and comprises 6 functional modules, such as a data engine, a data agent, a view management module, a view control module, a three-dimensional rendering engine, a multimedia display module and the like;
a data engine: the input and output of various data are mainly realized, and the system can support more types of data through the expansion of a data engine;
a data agent: the system is a core module for system data scheduling and management, and provides data support for modules such as view management, three-dimensional rendering and the like, and comprises the functions of data searching, calling, inquiring, statistics and the like; when a module such as view management and three-dimensional rendering needs to use certain data, submitting a data application to a data agent through an interface, searching in a data pool maintained by the data agent module, and immediately feeding back related data to the module for submitting the data application if the data is loaded in a memory; if the data is not loaded, calling a data input function of the data guide, loading related data into a data pool and feeding back the related data; meanwhile, the data proxy module maintains a data pool (data cache), and when certain data is not used any more, the data proxy module releases the data to recover the memory; the data proxy module adopts a multithreading method, so that the efficiency of data loading and maintenance is effectively improved;
And (3) view management: the method is used for constructing and maintaining a logic relationship of the three-dimensional scene; the view management module is used for constructing a three-dimensional scene by analyzing the three-dimensional scene configuration file and adopting a tree structure, and judging scene display relations, namely scene display, scene non-display and detail degree of scene display according to various factors such as scene configuration relations, viewpoint positions and the like; meanwhile, the view management module also maintains the association relation between the three-dimensional scene and the multimedia information data, judges whether the multimedia information needs to be loaded and displayed according to the user operation, and informs the multimedia information display module of the application layer to display;
viewpoint/interaction control: the multi-point touch interaction is supported, the multi-point touch gesture recognition function is realized, the multi-point touch gesture can be recognized and converted into operation on a viewpoint or other interactive operation and control commands, so that interaction data difference brought by different operating systems and multi-point touch equipment is avoided, and the adaptability of the system to different application environments is improved;
three-dimensional rendering engine: the method is mainly used for drawing the realism image of the three-dimensional scene; in the system design, the three-dimensional rendering engine is separated from view management and viewpoint control, and the separation of data and a drawing method is realized in practice, so that the three-dimensional rendering engine can be developed by adopting different 3D APIs (open GL, D3D and the like) under the condition of meeting the interface and data standards according to requirements so as to adapt to different application environments;
Multimedia display: providing various multimedia materials, data display and interaction functions, and supporting the display of general images, videos and webpages;
C. service layer: the service layer encapsulates functions provided by the platform layer, provides support for various application systems in a service form, and mainly comprises three types of services: visualization services, data services, and interactive control services;
D. application layer: the application layer comprises a three-dimensional navigation display platform and two modules of a management and application service platform;
three-dimensional guide display platform: the method mainly provides virtual simulation digital interactive service based on three-dimensional virtual cultural historic sites and tourist attractions, combines a geographic information technology and displays the depth of the theme culture, graceful environment, characteristic advantage real image of the attraction in a brand new guiding mode;
management and application service platform: the management function of providing system data for system management personnel mainly comprises the following steps: the system comprises a data management function of relevant information input, modification, backup and the like of scenic spots, a management function of geographic information and three-dimensional model data, a data association relation editing function, a system metadata visual analysis function and the like;
(2) Mobile application platform
The technology of the three-dimensional simulation engine based on autonomous research and development and the method and system for loading the three-dimensional model on the wireless intelligent terminal equipment solves the problems of high precision, large data volume and low use efficiency of various three-dimensional models on the mobile terminal of the mobile phone, and realizes the large-scale three-dimensional scene output conversion and external release of the mobile intelligent terminal;
the mobile user of the network virtual travel service system has the functions of hot spot recommendation, route planning, navigation, VR experience, service guide and the like.
The method fully utilizes modern information technology, virtual reality technology and three-dimensional simulation technology, establishes a three-dimensional virtual scene of a tourist attraction based on three-dimensional modeling through simulation and realization of super-realistic scenes, constructs a virtual tourist environment and constructs a virtual tourist service platform, and realizes real-time simulation and interaction of complex scenes based on web pages. The virtual roaming mode of the tourist attraction is provided, so that tourists can browse scenery in a three-dimensional virtual environment without going out, and the public service level of the tourist attraction is effectively improved. Meanwhile, the online virtual tourism mode and path are explored, and a foundation is laid for realizing the virtual tourism development prospect in China.
Drawings
FIG. 1 is a diagram of the overall architecture of the Web virtual travel service system of the present patent
FIG. 2 is a diagram of a system service architecture of the present patent
FIG. 3 is a diagram of the system architecture of the present patent
FIG. 4 is a frame diagram of the data normalization process of the present patent
FIG. 5 is a data structure of the data center of the present patent
FIG. 6 is a block diagram of a virtual tour specific core engine according to the present patent
FIG. 7 is a logic interface diagram of the virtual tour specific core engine of the present patent
FIG. 8 is a diagram showing the three-dimensional model construction and application relationship of the present patent
FIG. 9 is a server-side preloading strategy diagram of the present patent
FIG. 10 is a three-dimensional scene roaming structure diagram of the present patent
FIG. 11 is a flow chart of a preview process of a three-dimensional model of the present patent
FIG. 12 is a flow chart of the automatic roaming of the area in this patent
FIG. 13 is a flow chart of switching between optimized regions of the present patent
FIG. 14 is a flow chart of the optimized map switching scenario of the present patent
FIG. 15 is a diagram of a unified portal architecture for this patent
FIG. 16 is a PC side effect diagram of the unified web virtual travel portal implementation effect of the present patent
FIG. 17 is a case diagram showing the implementation effect of the present patent
FIG. 18 is a VR experience effect diagram of this patent
Detailed Description
A construction method of a network virtual travel system comprises the following steps:
First, creating a three-dimensional scene model of a tourist attraction
And acquiring three-dimensional topographic data of the tourist attraction by using an aerial photographing oblique photography technology. And acquiring data such as tourist attraction buildings, trees, vegetation, public facilities, service facilities and the like by using a three-dimensional laser scanning technology, and constructing a virtual tourist three-dimensional scene by integrating the three-dimensional topography data and the three-dimensional model data of the tourist attraction.
(II) building a Web virtual travel framework
1. System architecture
The web virtual travel service system includes: information resource input, data acquisition and normalization processing, a data center, a core engine, three-dimensional visualization, application management, unified portals and the like. The overall architecture of the network virtual travel service system is shown in FIG. 1;
2. system business architecture
The system takes a three-dimensional engine as a core, and a three-dimensional panoramic live-action mixed reality technology and a three-dimensional modeling simulation technology are applied to construct a digital virtual scenic spot, so that a virtual tourism system based on the Internet and the mobile Internet is realized. The system foreground realizes terminal model rendering, virtual travel experience, travel three-dimensional navigation, voice introduction, user interaction and the like. The system background realizes model library management, virtual travel scene management, travel service platform management and the like. The three-dimensional engine platform realizes three-dimensional model management, three-dimensional scene management, camera management, memory management, animation management, user interaction and the like. The data interaction realizes various data interaction between the system and the user, and the system service architecture is shown in figure 2;
3. System function architecture
The system is a B/S architecture and consists of two major parts of Internet foreground and background management. The Internet foreground is deployed on the public Internet, the external data interface supports microblog, weChat and APP, the client can support universal Windows/Android/iOS, the user data center can be deployed on the public Internet or an internal local area network, and the user can set related data to be public or private rights according to requirements. The system function architecture is shown in fig. 3;
model management: the system has the management functions of three-dimensional scenes, facility models and the like of tourist attractions.
Scene management: the method has the functions of loading, converting, scene organization design, camera hot spot position configuration, model grade display, memory loading and releasing and the like of a three-dimensional model.
Content management: has the functions of scenic spot introduction, scenic spot cultural activity, service guide, passenger flow distribution, garden knowledge and the like.
Tour guide: the system has the functions of theme scenic spots, classical scenic spot introduction, hot spot recommendation, panoramic roaming, travel route planning, scenic spot navigation, classical route tour, VR experience and the like.
Virtual communities: has the functions of travel attack, travel group, my world, my collection, my group, my footprint, and the like.
And (3) system management: the system mainly realizes the functions of user registration, login, user authority management, system menu management, system operation log record management and the like.
(III) network virtual tour system design
1. Information resource input system
Digitizing the data information data: various data of tourist attractions are processed by means of digital scanning, character input and the like to form digital document data.
Three-dimensional scanning system: and (3) scanning buildings, cultural relics and various service facilities of the tourist attraction by utilizing a laser three-dimensional scanning technology to form corresponding point cloud data, and laying a data foundation for three-dimensional modeling of the tourist attraction.
Travel geographic information acquisition system: the method comprises the steps of constructing a tourist attraction geographic information system, focusing on correction of attraction coordinate points, and establishing an accurate coordinate system of the attraction, thereby laying a foundation for three-dimensional navigation of the attraction.
2. Data acquisition and normalization
Data acquisition and normalization processing: and normalizing the unstructured, semi-structured and structured data acquired and input. The data normalization processing framework is shown in fig. 4;
3. data center
The data center stores a large number of complex data types, manages various multimedia information through the data types and rules of external files, and provides adding, deleting and modifying functions for various information resources.
The mechanism of sub-fields, multi-value fields and variable length fields allows the creation of many different types of unstructured or arbitrarily formatted fields, breaking through the very strict table structure of relational databases, allowing unstructured data to be stored and managed.
The unstructured data and the structured data are defined as storage units, so that the basic elements of the unstructured database are media files, various unstructured data can be stored and managed, and the conversion from system data management to content management is realized.
The data structure of the data center is shown in fig. 5;
4. core engine
The network virtual travel platform operates based on the Internet and the mobile Internet, has large three-dimensional scene data volume, virtual roaming, virtual navigation and real-time three-dimensional scene man-machine interaction as basic functions, but by applying any engine technology, huge supporting environments need to be downloaded, different operating systems and browsers need to download plug-ins of different versions, different graphical program interfaces are called, and great limitation is brought to development of the system.
The core engine has a high-performance progressive transmission mechanism, so that scene and model data volume required to be preloaded, transmitted and cached when the virtual scene roams is minimized, and tourists smoothly roam in the virtual scene through multithreaded streaming loading, and meanwhile, the requirement on network bandwidth is minimized.
(1) Core engine structure
The virtual tourism special core engine developed based on WebGL mainly solves the problems of high precision of a virtual scene three-dimensional model, large data volume and low use efficiency on the Internet, PC terminals and mobile terminals. The engine can directly run through the Internet browser without installing any plug-in, and is suitable for PC and mobile phone terminals. The engine is composed of an API interface layer, a logic control layer and an application interface layer, and the main functional modules are as follows: model control, model loading, collision detection, scene management, memory management, camera control, and the like.
And the class library, the programming interface and the GIS geographic information system data interface provided based on the WebGL realize the architecture and design of the engine bottom layer. In addition, the engine is internally provided with a plurality of three-dimensional scenes, models such as: three-dimensional models such as buildings, cultural relics, lake water, four-season trees, compasses, sky boxes and the like.
The logic control mainly realizes functions of camera position and visual field management and control, scene position control, camera physical collision detection, three-dimensional scene, model hierarchical loading management, scene switching management, navigation and navigation management, GIS geographic information system management, memory loading and releasing management and the like.
The application interface mainly realizes the functions of hot spot switching, automatic roaming, manual navigation, location service, map service, scene switching, navigation and camera direction and direction display.
The virtual travel special core engine structure is shown in fig. 6, and the virtual travel special core engine logic interface is shown in fig. 7;
(2) Key technology
Progressive download design of virtual scenes: the contradiction between large virtual travel scene, large building and tree models and large data volume and storage space of a user side is more obvious in the mobile terminal with small storage space, in order to solve the contradiction, a progressive downloading mechanism is adopted for real-time roaming travel of the virtual scene, multi-resolution hierarchical modeling is firstly carried out on the models, and then model data with different resolutions are downloaded as required according to factors such as the distance between an object and a view point, the deviation angle between the object and a sight line and the like, and the roaming visual effect is not reduced, so that network delay of scene downloading is reduced.
The light weight treatment technology comprises the following steps: due to the limitation of internet speed and bandwidth, the instant downloading of (super) large-scale WebVR virtual scenes and three-dimensional models on the internet has been a bottleneck problem. The virtual tour scene constructed by the three-dimensional model is smoothly played on the Web page, the number of patches and textures of the scene are required to be reduced, and a reuse mechanism is adopted to manufacture the scene model. 3D roaming of the virtual scene is realized according to the lightweight modeling, webVR script programming, background management and support architecture and lightweight engine scheduling technology. The plug-in-free simulation engine technology based on WebGL is designed to efficiently schedule scenes at millions of patch levels, so that the virtual roaming experience of users on the network is smoother.
Intelligent caching technology: the caching technology is a means for providing the three-dimensional performance of the mobile intelligent terminal with the most effectiveness, the simulation engine divides the network three-dimensional information service system into a plurality of independent physical layers, a multi-layer caching mechanism can be effectively realized, and an efficient caching system framework is built. The three-dimensional model information data prefetching mechanism is adopted, partial data are acquired from database service in advance and stored in the memory, the number of times that the three-dimensional service assembly accesses the three-dimensional space database is reduced, three-dimensional elements close to the three-dimensional space can be rapidly extracted in batches by utilizing the SQL query operation of the relational database, and the database is prevented from being accessed for multiple times. Network front-end caching: the data with a certain scale is gradually obtained, the data are spliced at the client, the once accessed regional data are cached at the local of the client, and the network transmission quantity and the interaction times between networks are reduced.
Progressive downloading and transmission mechanism of large-scale three-dimensional virtual scene: the three-dimensional engine can judge according to the viewpoint distance of a user by using a layered LOD loading mode, so that different models and maps are loaded, and model grades are divided into three-level LOD1 LOD2 LOD3 according to the number of model grids. The model map is also time division 1024x1024 512x512 256x256. The model will call lod3 texture maps will call 256x256 size textures if the user viewpoint distance is above 10 m. Therefore, more models can be loaded more quickly by using the models with low mesh numbers and small materials.
5. Three-dimensional visualization and application management
The three-dimensional visualization and application management mainly realize virtual tour guide display, leisure and entertainment based on three-dimensional scenes, and dynamic loading management of consumption services and information (characters, pictures, videos, three-dimensional scenes and the like) around tourist attractions. The method mainly solves the problems of rapid loading of a three-dimensional scene and a three-dimensional model, roaming of the three-dimensional scene and the like. The three-dimensional model composition and application relationship is shown in fig. 8;
(1) Three-dimensional model loading strategy
The three-dimensional model comprises geometric body information, connection information and attribute information, wherein the geometric body and the connected characteristics of the three-dimensional model are extracted, an algorithm for progressively compressing the geometric body and the connection information is adopted, and the three-dimensional model data stored at a server side are effectively compressed by combining with an attribute compression algorithm of textures, precision, coordinates and the like; establishing a three-dimensional scene and model attribute identification codes on the basis of geometry, connection and attribute extraction, and realizing quick retrieval and transmission of the model; in order to ensure the correctness of data transmission of each client and prevent repeated transmission of data, the data is normalized at a server end, and the quick and effective loading of a three-dimensional scene and a model is ensured. The server-side preloading strategy is shown in fig. 9;
(2) Three-dimensional roaming
Setting a scene loading trigger switch in a roaming scene by means of a roaming time axis, and loading a model of the next scene in the route by the roaming camera once triggering the loading switch in the scene, wherein rendering is not performed after loading is completed. The system running memory will not be occupied for rendering the model. When the current scene roams completely, the user touching the rendering trigger switch to render the next scene can continue to roam the next scene without waiting. As shown in fig. 10;
three-dimensional model preview:
three-dimensional model preview flow, the engine user background configures the model preview related information and saves to a database, such as: model preview trigger path, preview model path, etc. When the three-dimensional program is initialized, the related data of the model preview is requested from the background, and the data is transmitted to the three-dimensional engine for related initialization of the model preview. The user triggers the model preview through UI operation or mouse, keyboard operation and the like, the three-dimensional engine initializes the model preview scene according to the related information contained in the trigger event, loads the preview model, returns the scene to the three-dimensional program to repeatedly render the scene after the model is loaded, and generates an interface of the omnibearing and multi-angle preview model for the program user to preview. The specific process flow is shown in fig. 11;
Regional automatic roaming:
and (3) an area automatic roaming process, wherein an engine user configures the position of the automatic roaming key point camera and the orientation of the camera when the position are configured through a background and stores the position and orientation of the camera into a database. And when the three-dimensional program is initialized, acquiring the data related to the automatic roaming from the background and initializing the automatic roaming module. The program user sends a request for starting automatic roaming through the UI, and the three-dimensional engine starts automatic roaming after receiving the request. The specific flow is shown in fig. 12;
switching between optimization areas:
zone-to-zone handoff flow profile: the engine user sets information such as picture introduction, text introduction and the like of each area through the background and stores the information into the database, the user switches the area through UI operation, related information of the area is requested from the background, and the three-dimensional engine requests the model loading progress and displays the model in real time. The model loading is completed and the camera jumps to that region. The specific flow is shown in fig. 13;
optimizing map switching scenes:
the map is switched to the three-dimensional scene flow profile: the engine user sets related information such as picture introduction and text introduction of scenic spots through the background, the user clicks the scenic spots of scenic spots on the map, and the map module acquires the information of the scenic spots and feeds the information back to the three-dimensional program. The three-dimensional program requests the picture introduction, the text introduction and the model data corresponding to the hot spot, the model loading is completed, and the hot spot is entered. The specific flow is shown in fig. 14;
6. Unified portal
The system unified portal comprises a unified data center and a unified user interface, displays and publishes the virtual travel system through a WEB/WAP website, can be linked with a third party service platform, and supports Android and iOS system applications.
(1) Unified portal system
The unified portal system architecture is shown in fig. 15;
the unified portal adopts an SOA architecture and is designed according to a four-layer structure, and comprises a data layer, a platform layer, a service layer and an application layer.
A. Data layer: includes four types of data
Basic geographic information data: the multi-scale geographic information data necessary for the information such as the geographic position, the overall layout, the scenic spot planning, the scenic spot distribution and the like of the tourist attraction comprises the geographic element data such as scenic spot regions, tourist roads and the like stored in a vector format, and also comprises the data such as remote sensing images, digital ground models and the like stored in a grid format.
Three-dimensional model data: the three-dimensional model data mainly comprises geometric models and texture data of a virtual tourist attraction three-dimensional scene, scenic spots, various facilities and the like, wherein the geometric models support various commercial or general data formats such as 3ds, obj, OSG and IVE, and the textures support various general image data formats such as BMP, JPG, PNG and TGA.
Multimedia data: the multimedia data includes various multimedia data for describing scenic spots in detail, and besides the general image data format, the multimedia data also supports a WMA, WAV, AVI, FLA video-audio file format and an HTML webpage data format.
Tourist attraction information: the system comprises internal management application data and various multimedia data for detailed description of scenic spots of external services, including general images, video and audio and web page formats.
B. Platform layer: the platform layer is a core of system realization and comprises 6 functional modules of a data engine, a data agent, a view management, a view control, a three-dimensional rendering engine, a multimedia display and the like.
A data engine: the system mainly realizes the input and output of various data, and can support more types of data through the expansion of a data engine.
A data agent: the system is a core module for system data scheduling and management, and provides data support for modules such as view management and three-dimensional rendering, and the functions of data searching, calling, inquiring, statistics and the like are included. When a module such as view management and three-dimensional rendering needs to use certain data, submitting a data application to a data agent through an interface, searching in a data pool maintained by the data agent module, and immediately feeding back related data to the module for submitting the data application if the data is loaded in a memory; and if the data is not loaded, calling a data input function of the data guide, loading related data into a data pool and feeding back. Meanwhile, the data proxy module maintains a data pool (data cache), and when certain data is not used any more, the data proxy module releases the data to recover the memory. The data proxy module adopts a multithreading method, so that the data loading and maintaining efficiency is effectively improved.
And (3) view management: the method is used for constructing and maintaining the logical relationship of the three-dimensional scene. The view management module is used for constructing a three-dimensional scene by analyzing the three-dimensional scene configuration file and adopting a tree structure, and judging scene display relations, namely scene display, scene non-display and detail degree of scene display according to various factors such as scene configuration relations, viewpoint positions and the like. Meanwhile, the view management module also maintains the association relation between the three-dimensional scene and the multimedia information data, judges whether the multimedia information needs to be loaded and displayed according to the user operation, and informs the multimedia information display module of the application layer to display.
Viewpoint/interaction control: the multi-point touch interaction is supported, the multi-point touch gesture recognition system has a user gesture recognition function, and the multi-point touch gesture can be recognized and converted into operation on a viewpoint or other interactive operation and control commands, so that interaction data difference brought by different operating systems and multi-point touch equipment is avoided, and the adaptability of the system to different application environments is improved.
Three-dimensional rendering engine: the method is mainly used for drawing the realistic image of the three-dimensional scene. In the system design, the three-dimensional rendering engine is separated from view management and viewpoint control, and the separation of data and a drawing method is realized in practice, so that the three-dimensional rendering engine can be developed by adopting different 3D APIs (open GL, D3D and the like) under the condition of meeting the interface and data standards according to requirements so as to adapt to different application environments.
Multimedia display: the method provides the display and interaction functions of various multimedia materials and data, and supports the display of general images, videos and webpages.
C. Service layer: the service layer encapsulates functions provided by the platform layer, provides support for various application systems in a service form, and mainly comprises three types of services: visualization services, data services, and interactive control services.
D. Application layer: the application layer comprises a three-dimensional navigation display platform and two modules of a management and application service platform.
Three-dimensional guide display platform: the virtual simulation digital interaction service based on the three-dimensional virtual cultural historic site and the tourist attraction is mainly provided, and the depth of the theme culture, the graceful environment and the characteristic advantage real image of the attraction is displayed in a brand new guiding mode by combining a geographic information technology.
Management and application service platform: the management function of providing system data for system management personnel mainly comprises the following steps: the system comprises a data management function of inputting, modifying, backing up relevant information of scenic spots, a management function of geographic information and three-dimensional model data, a data association relation editing function, a system metadata visual analysis function and the like. The PC end of the unified network virtual tour portal realization effect is shown in figure 16;
(2) Mobile application platform
The method solves the problems of high precision, large data volume and low use efficiency of various three-dimensional models on mobile terminals of mobile phones, and realizes large-scale three-dimensional scene output conversion and external release of the mobile intelligent terminals based on the technologies of an independently developed three-dimensional simulation engine, a method and a system for loading the three-dimensional models on wireless intelligent terminal equipment (invention patent application number: 201610438526.7) and the like.
The mobile user side of the network virtual travel service system has the functions of hot spot promotion, route planning, navigation, VR experience, service guide and the like, the implementation effect is shown in fig. 17, and the VR experience effect is shown in fig. 18.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (1)
1. A construction method of a network virtual travel system comprises the following steps:
first, creating a three-dimensional scene model of a tourist attraction
Acquiring three-dimensional topographic data of a tourist attraction by using an aerial photograph oblique photography technology; acquiring tourist attraction building, trees, vegetation, public facilities and service facility data by using a three-dimensional laser scanning technology, and constructing a virtual tourist three-dimensional scene by integrating the tourist attraction three-dimensional topography data and the three-dimensional model data;
(II) building a Web virtual travel framework
1. System architecture
The web virtual travel service system includes: information resource input, data acquisition and normalization processing, a data center, a core engine, three-dimensional visualization, application management and unified portal components;
2. system business architecture
The system takes a three-dimensional engine as a core, and a three-dimensional panoramic live-action mixed reality technology and a three-dimensional modeling simulation technology are applied to construct a digital virtual scenic spot, so that a virtual tourism system based on the Internet and the mobile Internet is realized; the system foreground realizes terminal model rendering, virtual travel experience, travel three-dimensional navigation, voice introduction and user interaction; the system background realizes model library management, virtual travel scene management and travel service platform management; the three-dimensional engine platform realizes three-dimensional model management, three-dimensional scene management, camera management, memory management, animation management and user interaction; the data interaction realizes various data interactions between the system and the user;
3. system function architecture
The system is a B/S architecture and consists of two parts of Internet foreground and background management; the Internet foreground is deployed on the public Internet, the external data interface supports microblog, weChat and APP, the client can support universal Windows/Android/iOS, the user data center is deployed on the public Internet and on an internal local area network, and the user sets related data to be public or private rights according to requirements;
Model management: the system has the functions of three-dimensional scene of tourist attraction and facility model management;
scene management: the system has the functions of loading, converting, scene organization design, camera hot spot position configuration, model grade display and memory loading and releasing;
content management: the tourist attraction has the functions of attraction introduction, attraction cultural activity, service guide, passenger flow distribution and garden-of-tour beard and knowledge;
tour guide: the system has the functions of theme scenic spots, classical scenic spot introduction, hot spot recommendation, panoramic roaming, tourist route planning, scenic spot navigation, classical route tour and VR experience;
virtual communities: has the functions of travel attack, travel group, my world, my collection, my group and my footprint;
and (3) system management: user registration, login, user authority management, system menu management and system operation log record management functions are realized;
(III) network virtual tour system design
1. Information resource input system
Digitizing the data information data: processing various data of the tourist attraction by utilizing a digital scanning and character input mode to form digital document data;
three-dimensional scanning system: scanning buildings, cultural relics and various service facilities of the tourist attraction by utilizing a laser three-dimensional scanning technology to form corresponding point cloud data, and laying a data foundation for three-dimensional modeling of the tourist attraction;
Travel geographic information acquisition system: constructing a tourist attraction geographic information system, establishing an accurate coordinate system of the attraction for correcting coordinate points of the attraction, and laying a foundation for three-dimensional navigation of the attraction;
2. data acquisition and normalization
Data acquisition and normalization processing: normalizing the unstructured, semi-structured and structured data acquired and input;
3. data center
The data center is used for storing a large number of complex data types, managing various multimedia information through the data types and rules of external files, and providing adding, deleting and modifying functions for various information resources;
the mechanism of sub-fields, multi-value fields and variable length fields is adopted, so that a plurality of unstructured or arbitrarily formatted fields of different types are allowed to be created, a very strict table structure of a relational database is broken through, and unstructured data is stored and managed;
the unstructured data and the structured data are defined as storage units, so that the basic elements of the unstructured database are media files, various unstructured data can be stored and managed, and the conversion from system data management to content management is realized;
4. core engine
The network virtual travel platform operates based on the Internet and the mobile Internet, and has the basic functions of virtual roaming, virtual navigation and real-time three-dimensional scene man-machine interaction, wherein the three-dimensional scene data volume is large;
the core engine has a high-performance progressive transmission mechanism, so that scene and model data volume required to be preloaded, transmitted and cached during virtual scene roaming is minimized, tourists can smoothly roam in the virtual scene through multithread streaming loading, and the requirement on network bandwidth is minimized;
(1) Core engine structure
The virtual tourism special core engine developed based on WebGL solves the problems of high precision, large data volume of a virtual scene three-dimensional model and low use efficiency on the Internet, PC terminals and mobile terminals; the engine can directly run through the Internet browser without installing any plug-in, and is suitable for PC and mobile phone terminals; the engine is composed of an API interface layer, a logic control layer and an application interface layer, and the functional modules are as follows: model control, model loading, collision detection, scene management, memory management and camera control;
the method comprises the steps of realizing an engine bottom architecture and design based on a class library, a programming interface and a GIS geographic information system data interface provided by WebGL; in addition, the engine is internally provided with a plurality of three-dimensional scenes, models such as: three-dimensional models of buildings, cultural relics, lake water, four-season trees, compasses and sky boxes;
The logic control realizes functions of camera position and visual field management and control, scene position control, camera physical collision detection, three-dimensional scene, model hierarchical loading management, scene switching management, navigation management, GIS geographic information system management and memory loading and releasing management;
the application interface realizes the functions of hot spot switching, automatic roaming, manual navigation, position service, map service, scene switching, navigation and camera direction and direction display;
(2) Key technology
Progressive download design of virtual scenes: the contradiction between large virtual travel scene, more building and tree models and large data volume and the storage space of a user side is more obvious in the mobile terminal with small storage space, in order to solve the contradiction, a progressive downloading mechanism is adopted for real-time roaming travel of the virtual scene, multi-resolution hierarchical modeling is firstly carried out on the models, and then model data with different resolutions are downloaded as required according to the distance between an object and a view point and the deviation angle factors of the object and the view line, so that the network delay of scene downloading is reduced;
the light weight treatment technology comprises the following steps: due to the limitation of internet speed and bandwidth, instant downloading of large-scale WebVR virtual scenes and three-dimensional models on the internet is always a bottleneck problem; the virtual tour scene constructed by the three-dimensional model is smoothly played on the Web page, the number of patches and textures of the scene are required to be reduced, and a reuse mechanism is adopted to manufacture a scene model; 3D roaming of the virtual scene is realized according to the lightweight modeling, webVR script programming, background management and support architecture and lightweight engine scheduling technology; the plug-in-free simulation engine technology based on WebGL is designed to efficiently schedule scenes of millions of patches, so that virtual roaming experience of users on the network becomes smoother;
Intelligent caching technology: the caching technology is a means for providing the most effective three-dimensional performance of the mobile intelligent terminal, the simulation engine divides the network three-dimensional information service system into a plurality of independent physical layers, a multi-layer caching mechanism is effectively realized, and an efficient caching system framework is built; the method comprises the steps that a three-dimensional model information data prefetching mechanism is adopted, partial data are obtained from database services in advance, the number of times that a three-dimensional service assembly accesses a three-dimensional space database is reduced, three-dimensional elements close to the three-dimensional space are extracted in batches rapidly through SQL query operation of the relational database, and the database is prevented from being accessed for multiple times; network front-end caching: gradually acquiring data with a certain scale, splicing the data at the client, and caching the once accessed regional data at the local of the client, so that the network transmission quantity and the interaction times between networks are reduced;
progressive downloading and transmission mechanism of large-scale three-dimensional virtual scene: the three-dimensional engine can judge according to the viewpoint distance of a user by using a layered LOD loading mode, so that different models and maps are loaded, and the model level is divided into three levels LOD1LOD2LOD3 according to the number of model grids; model mapping is divided into 1024x1024, 512x512 and 256x256 simultaneously; if the user viewpoint distance is higher than 10m, the model calls lod3 texture mapping and 256x256 size texture; therefore, more models can be loaded more quickly by using the models with low grid number and small materials;
5. Three-dimensional visualization and application management
The three-dimensional visualization and application management realize virtual tour guide display, leisure entertainment based on three-dimensional scenes, consumption service around tourist attractions and information dynamic loading management; the method solves the problems of rapid loading of the three-dimensional scene and the three-dimensional model and roaming of the three-dimensional scene;
(1) Three-dimensional model loading strategy
The three-dimensional model comprises geometric body information, connection information and attribute information, wherein the geometric body and the connected characteristics of the three-dimensional model are extracted, an algorithm for progressively compressing the geometric body and the connection information is adopted, and the three-dimensional model data stored in a server side are effectively compressed by combining with an attribute compression algorithm of textures, precision and coordinates; establishing a three-dimensional scene and model attribute identification codes on the basis of geometry, connection and attribute extraction, and realizing quick retrieval and transmission of the model; in order to ensure the correctness of data transmission of each client and prevent repeated transmission of data, normalizing the data at a server end and ensuring the rapid and effective loading of a three-dimensional scene and a model;
(2) Three-dimensional roaming
Setting a scene loading trigger switch in a roaming scene by means of a roaming time axis, and once the roaming camera triggers the loading switch in the scene, loading a model of a next scene in a route, and not rendering after loading is completed; the rendering model does not occupy the running memory of the system; touching the rendering trigger switch when the current scene is roamed, and rendering the next scene without waiting for the user to continue to roam the next scene;
Three-dimensional model preview:
and (3) a three-dimensional model preview flow, wherein the background of the engine user configures the model preview related information and stores the information into a database: model preview triggering paths and preview model paths; when the three-dimensional program is initialized, the related data of the model preview is requested from the background, and the data is transmitted to the three-dimensional engine for related initialization of the model preview; the user triggers the model preview through UI operation or mouse and keyboard operation, the three-dimensional engine initializes the model preview scene and loads the preview model according to the related information contained in the trigger event, after the model is loaded, the scene is returned to the three-dimensional program to repeatedly render the scene, and an interface of the omnibearing and multi-angle preview model is generated for the program user to preview;
regional automatic roaming:
the method comprises the steps of an area automatic roaming flow, wherein an engine user configures the position of an automatic roaming key point camera and the orientation of the camera when the position is set through a background, and stores the position and the orientation of the camera in a database; when the three-dimensional program is initialized, acquiring the related data of automatic roaming from the background and initializing an automatic roaming module; the program user sends a request for starting automatic roaming through the UI, and the three-dimensional engine starts automatic roaming after receiving the request;
switching between optimization areas:
Zone-to-zone handoff flow profile: setting picture brief introduction information and text introduction information of each region by an engine user through a background, storing the information into a database, switching the region by the user through UI operation, requesting related information of the region from the background, requesting a model loading progress by a three-dimensional engine, and displaying the model loading progress in real time; completing model loading, and jumping the camera to the area;
optimizing map switching scenes:
the map is switched to the three-dimensional scene flow profile: setting picture introduction and text introduction related information of scenic spots by an engine user through a background, storing the picture introduction and text introduction related information into a database, clicking the scenic spots on a map by the user, acquiring the information of the scenic spots by a map module, and feeding back the information to a three-dimensional program; the three-dimensional program requests picture introduction, text introduction and model data corresponding to the hot scenic spot, the model loading is completed, and the hot scenic spot is entered;
6. unified portal
The system unified portal comprises a unified data center and a unified user interface, a virtual travel system is displayed and released through a WEB/WAP website, a third party service platform is linked, and the unified portal supports Android and iOS system applications;
(1) Unified portal system
The unified portal adopts an SOA architecture and is designed according to a four-layer structure, and comprises a data layer, a platform layer, a service layer and an application layer;
A. Data layer: includes four types of data
Basic geographic information data: the system comprises multi-scale geographic information data necessary for tourist attraction geographic position, overall layout, attraction planning and attraction distribution information, wherein the multi-scale geographic information data comprises attraction division and tourist road geographic element data stored in a vector format, and remote sensing images and digital ground model data stored in a grid format;
three-dimensional model data: the three-dimensional model data comprises a virtual tourist attraction three-dimensional scene, a attraction, various facility geometric models and texture data, wherein the geometric models support 3ds, obj, OSG and IVE various commercial or general data formats, and the textures support BMP, JPG, PNG and TGA various general image data formats;
multimedia data: the method comprises the steps of introducing various multimedia data in detail of tourist attractions, and supporting WMA, WAV, AVI, FLA video and audio file formats and HTML webpage data formats besides the general image data formats;
tourist attraction information: the method comprises the steps of internally managing application data, and introducing various multimedia data including general images, video and audio and webpage formats in detail to scenic spots served by the outside;
B. platform layer: the platform layer is a core of system realization and comprises 6 functional modules of a data engine, a data agent, a view management, a view control, a three-dimensional rendering engine and a multimedia display;
A data engine: the input and output of various data are realized, and the system supports more types of data through the expansion of a data engine;
a data agent: the system is a core module for system data scheduling and management, and provides data support for a view management and three-dimensional rendering module, and comprises data searching, calling, inquiring and statistics functions; when a view management and three-dimensional rendering module needs to use certain data, submitting a data application to a data agent through an interface, searching in a data pool maintained by the data agent module, and immediately feeding back related data to the module for submitting the data application if the data is loaded in a memory; if the data is not loaded, calling a data input function of the data guide, loading related data into a data pool and feeding back the related data; meanwhile, the data proxy module maintains the data pool, and when certain data is not used any more, the data proxy module releases the data to recover the memory; the data proxy module adopts a multithreading method, so that the efficiency of data loading and maintenance is effectively improved;
and (3) view management: the method is used for constructing and maintaining a logic relationship of the three-dimensional scene; the view management module is used for constructing a three-dimensional scene by analyzing the three-dimensional scene configuration file and adopting a tree structure, and judging scene display relations, namely scene display, scene non-display and detail degree of scene display according to various factors of the scene configuration relations and viewpoint positions; meanwhile, the view management module also maintains the association relation between the three-dimensional scene and the multimedia information data, judges whether the multimedia information needs to be loaded and displayed according to the user operation, and informs the multimedia information display module of the application layer to display;
Viewpoint/interaction control: the multi-point touch interaction is supported, the multi-point touch gesture recognition function is realized, the multi-point touch gesture is recognized and converted into operation on a viewpoint or other interactive operation and control commands, so that interaction data difference brought by different operating systems and multi-point touch equipment is avoided, and the adaptability of the system to different application environments is improved;
three-dimensional rendering engine: a realistic image for drawing a three-dimensional scene; in the system design, the three-dimensional rendering engine is separated from view management and viewpoint control, and the separation of data and a drawing method is realized in practice, so that the three-dimensional rendering engine adopts OpenGL and D3D different 3D APIs to develop according to requirements under the condition of meeting interface and data standards so as to adapt to different application environments;
multimedia display: providing various multimedia materials, data display and interaction functions, and supporting the display of general images, videos and webpages;
C. service layer: the service layer encapsulates functions provided by the platform layer, provides support for various application systems in a service form, and comprises three types of services: visualization services, data services, and interactive control services;
D. Application layer: the application layer comprises a three-dimensional navigation display platform and two modules of a management and application service platform;
three-dimensional guide display platform: providing a virtual simulation digital interaction service based on three-dimensional virtual cultural histories and tourist attractions, and showing the depth of the theme culture, graceful environment, characteristic advantage real image of the attraction in a brand new navigation mode by combining a geographic information technology;
management and application service platform: the system manager is oriented to provide management functions of system data, comprising: the system comprises a scenic spot related information input, modification and backup data management function, a geographic information and three-dimensional model data management function, a data association relation editing function and a system metadata visual analysis function;
(2) Mobile application platform
The technology of the three-dimensional simulation engine based on autonomous research and development and the method and system for loading the three-dimensional model on the wireless intelligent terminal equipment solves the problems of high precision, large data volume and low use efficiency of various three-dimensional models on the mobile terminal of the mobile phone, and realizes the large-scale three-dimensional scene output conversion and external release of the mobile intelligent terminal;
the network virtual travel service system mobile user has hot spot recommendation, route planning, navigation, VR experience and service guide functions.
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