CN110018742A - A kind of network virtual touring system and its construction method - Google Patents
A kind of network virtual touring system and its construction method Download PDFInfo
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Abstract
The present invention provides a kind of network virtual touring system and its construction method, include the following steps: that (one) creates tourist attraction three-dimensional scene models；(2) building network virtual tourism frame；(3) network virtual touring system designs.This patent makes full use of modern information technologies, virtual reality technology, three-dimensional simulation technique, by simulating the realization with super reality scape, establish the tourist attraction three-dimensional virtual scene based on three-dimensional modeling, construct virtual tourism environment, virtual tourism service platform is built, realizes web-based complex scene real-time simulation and interaction.It proposes tourist attraction virtual roaming mode, tourist is made to stay indoors, honourable beautiful scenery can be browsed in the virtual environment of 3 D stereo, has a taste of long culture, it is horizontal effectively to promote tourist attraction public service.Virtual tourism on network mode and path are explored simultaneously, is laid the foundation for the realization of China's virtual tourism vision.
Description
Technical field
The present invention relates to network virtual touring system and its construction method, especially one kind to make full use of present information skill
Art, virtual reality technology, three-dimensional simulation technique establish the tourism based on three-dimensional modeling by simulating the realization with super reality scape
Scenic spot three-dimensional virtual scene constructs virtual tourism environment, builds virtual tourism service platform, realizes web-based complex scene
Real-time simulation and a kind of network virtual touring system and its construction method interacted.
Background technique
The news of the modern information technologies such as internet, virtual reality, multimedia and visualization hail exhibition, are the production of virtual tourism
Life provides the foundation.The property, independence, across time and space property, Multi-Sensory, interactivity, economy and safety when participating in the cintest of virtual tourism
Property etc. feature and advantage, more and more people begin to focus on and enjoy virtual tourism, become in tourism industry unique wind together
Scape.
As the Developing Virtual tourism of information technology is at home and abroad rapidly developed, there are many virtual tourism systems at present
System investment application, produces huge economic benefit, more representational to have: " second life in the U.S. laboratory Lin Deng
Second Life ", the platform construction one extensive, more people online 3D virtual worlds, tourist enable virtualization agent into
Row automatic guiding." the virtual ancient Roman of 3D " that Google releases, constructs 3D buildings model, online ancient sieve for reappearing the period of full bloom
Horse.The Forbidden City and IBM have developed " virtual cercis city The Virtual Forbidden City " cooperatively, construct palace, historical relic
And task model, the virtual imperial grand occasion for reappearing current year." the wisdom Lijing 3D tourism platform " of Flying Carpet company research and development makes tourist exist
Line roams Lijing beautiful scenery.
These systems technically use three-dimensional modeling, textures and shadow lamp means building 3D scene, with 3D engine into
The technologies such as row scene, resource, role and animation management, dynamic importing and unloading resource, viewing volume reduction, have feeling of immersion, hand over
Mutual property and imagination, but scene modeling complicated and time consumption, model data amount are huge, and system operation need to download installation client and to hard
Part platform property is more demanding, does not support mobile terminal application.
In recent years, China has carried out more in-depth study and practice in terms of virtual tourism, " digital Dunhuang virtual roaming
System " is solved using the contradiction with protection, and tourist is made not enter grottoes, can equally enjoy exquisite mural painting, painted sculptures, impression
To the Dunhuang culture broken a person's heart." virtual Ming Emperor's Tomb system " uses the virtual reality skill of Bitmanagerment company, Germany
Art is proposed a complete multi-user and goes sight-seeing interaction platform on the net, illustrates the bright filial piety in world heritage Nanjing with digital form
Mound existing building.
Currently, the domestic virtual tourism website for also having researched and developed some professions, such as: Chinese panorama net, virtual the Forbidden City are rich
The three-dimensional experience website Mirror City of object institute, double Rushan tomb of Han dynasty scenes etc., Chengdu and Changsha construction, opens domestic 24 cities
The City8 etc. in city.But mainstream realization technology is based on 360 degree of panoramas based on video image, and there are no built based on three-dimensional
The integrated system and service platform of mould are especially a lack of the autonomous mode of tourism etc. based on virtual scene.
Summary of the invention
To solve the above problems, the present invention provides one kind to make full use of modern information technologies, virtual reality technology, three-dimensional
Emulation technology establishes the tourist attraction three-dimensional virtual scene based on three-dimensional modeling, building by simulating the realization with super reality scape
Virtual tourism environment builds virtual tourism service platform, realizes web-based complex scene real-time simulation and one kind for interacting
Network virtual touring system and its construction method.
A kind of network virtual touring system and its construction method, include the following steps:
(1) tourist attraction three-dimensional scene models are created
Using oblique photograph technology of taking photo by plane, tourist attraction three dimensional topographic data is acquired；Using three-dimensional laser scanning technique, adopt
Collect the data such as tourist attraction building, trees, vegetation, communal facility and service facility, comprehensive tourist attraction three dimensional topographic data with
Three-dimensional modeling data constructs virtual tourism three-dimensional scenic；
(2) building network virtual tourism frame
1. system general frame
Network virtual tourism service system include: information resources typing, data acquisition with normalization processing, data center,
The part such as core engine, three-dimensional visualization and application management and united portal forms；Network virtual tourism service system totality frame
Structure is as shown in Figure 1；
2. system business framework
System mixes reality technology, three-dimensional modeling emulation technology structure using d engine as core, using three-dimensional panorama outdoor scene
Digital virtual scenic spot is built, realizes the virtual tour system based on internet and mobile Internet；Realize terminal model in system foreground
Rendering, virtual tourism experience, three-dimensional of travelling guide to visitors, voice profile and user's interaction etc.；System background implementation model depositary management reason, void
Quasi- tourism scene management and tourist service platform management etc.；D engine platform realize threedimensional model management, three-dimensional scenic management,
Camera management, memory management, animation management and user's interaction etc.；Data interaction realizes that system is interacted with the Various types of data of user；
3. system function framework
System is that B/S framework is made of internet foreground, back-stage management two large divisions；Internet foreground is deployed in public mutual
In networking, external data interface supports microblogging, wechat, APP, and client can support general Windows/Android/iOS, uses
User data center can be deployed in public internet and also be deployed in internal lan, user can set according to demand related data as
Publicly-owned or private permission；
Model management: there are the management functions such as tourist attraction three-dimensional scenic, facility model；
Scene management: there is threedimensional model load, conversion, the configuration of scene organization design, camera hotspot location, model grade
It shows, memory loads the functions such as release；
Content Management: there is landscape video active information service system of scenic introduction, scenic spot cultural activity, service guide, Trip distribution and palpus of visiting a park
The functions such as know；
Tourism guide to visitors: there is theme scenic spot, classical sight spot introduction, hot spot promotion, Panoramic Warping, travel-line planning, scape
The functions such as the navigation of area's guide to visitors, classic travel route visit and VR experience；
Virtual community: there is tourism strategy, tourism to form a team, my world, my collection, I form a team, my footprint etc.
Function；
System administration: it mainly realizes user's registration, log in, user authority management, System menu management and system operatio day
The functions such as will record management；
(3) network virtual touring system designs
1. information resources input system
Data information data digitalization: in the way of digital scan, words input etc. to the various data of tourist attraction into
Row processing, forms digitized document data；
3 D scanning system: the Airborne Laser Scan is utilized, to the building of tourist attraction, historical relic, all kinds of service facilities
It is scanned, forms corresponding point cloud data, establish data basis for the three-dimensional modeling of tourist attraction；
Geography of tourism information acquisition system: building tourist attraction GIS-Geographic Information System, emphasis are the amendment of scenic spot coordinate points,
The accurate coordinate-system in scenic spot is established, is laid the foundation for scenic spot three-dimensional guide to visitors；
2. data acquisition and normalization
Data acquisition is handled with normalization: carrying out specification to unstructured, the semi-structured and structured data of acquisition typing
Change processing；
3. data center
Data center stores the data type of large amount of complex, which passes through its external file data type and rule
Then, a variety of multimedia messages are managed, and additions and deletions are provided for various information resources and change Cha Gongneng；
Using the mechanism of subfield, Multiple Value Field and variable-length field, allow to create many different types of unstructured
Or arbitrary format field, so that the very strict table structure of relational database is breached, so that unstructured data is able to
Storage and management；
Unstructured and structural data is all defined as storage unit, so that the basic element of non-structural database is exactly
Media file itself, can the various unstructured datas of storage and management, realize System data management to content pipe
The conversion of reason；
4. core engine
Network virtual tourism platform is run based on internet and mobile Internet, and scene data amount is very big, virtually
Roaming, virtual guide to visitors and real-time three-dimensional scene human-computer interaction are its basic functions, but apply above-mentioned any engine technique, all
There is that need to download huge support environment, different operating system and browser need to download the plug-in unit of different editions, call
Different graphic routine interface brings very big limitation for the exploitation of system；
Core engine progressive transmission mechanism with high performance, make to need when dummy scene roaming to preload, transmission and
The scene and model data amount of caching reach minimum, are loaded by multithreading streaming, overflow tourist in virtual scene glibly
Trip, while to network bandwidth requirement minimum；
(1) core engine structure
The dedicated core engine emphasis of virtual tourism based on WebGL exploitation solve virtual scene threedimensional model precision it is high,
Data volume is big, the not high problem of service efficiency on internet, PC terminal and mobile terminal；The engine is without installing any plug-in unit
It can directly be run by Internet-browser, be suitable for PC and mobile phone terminal；Engine by api interface layer, logic control layer and
Application-interface layer composition, main functional modules have: model cootrol, model load, collision detection, scene management, memory management, phase
Machine control etc.；
Class libraries, programming interface and the GIS GIS data interface provided based on WebGL realizes engine bottom architecture
With design；In addition many three-dimensional scenics, model built in engine be such as: building, historical relic, lake water, four seasons tree, compass, day sylphon
Threedimensional model；
Logic control is mainly realized camera position and visual field management and is controlled, scene location controls, camera physical impacts are examined
Survey, three-dimensional scenic, the management of model hierarchical loading, scene switching management, navigation guide to visitors management, the management of GIS GIS-Geographic Information System with
And the functions such as memory load release management；
Application interface mainly realizes that hot spot switching, automatic roaming, manual navigation, location-based service, Map Services, scene are cut
It changes, navigate guide to visitors and camera direction orientation displaying function；
(2) key technology
The progressive download of virtual scene designs: virtual tourism scene is big, building and tree modelling are more, data volume greatly with use
The contradiction of family end memory space embodies to become apparent in the mobile terminal of small memory space, in order to solve the contradiction, to void
Quasi- scene real time roaming walking first carries out multiresolution classification modeling to model using progressive download mechanism is based on, further according to
Object is at a distance from viewpoint, the factors such as the deviation angle of object and sight, while not reducing roaming visual effect, on demand under
Carrier has the model data of different resolution, to reduce the network delay of scene downloading；
Light-weight technologg technology: due to the network speed of internet and the limitation of bandwidth, online (super) extensive WebVR virtual field
The instant downloading of scape and threedimensional model is always a bottleneck problem；The virtual tourism scene of threedimensional model building is in Web page
It is upper to be played glibly, the dough sheet number and texture of scene must be reduced, and model of place is made using reuse mechanism；According to light
Quantization modeling → WebVR Script Programming → back-stage management realizes virtual field with supporting framework → light-weighted engine scheduling technology
The 3D of scape is roamed；Design exempts from plug-in unit simulation engine technology based on WebGL efficiently to dispatch the other scene of millions of patch-levels,
User is set to become more smooth in online virtual roaming experience；
Intelligent buffer technology: caching technology is to provide the most effective means of mobile intelligent terminal three-dimensional performance, simulation engine
Network Three-dimensional information service system is divided into multiple separate physical levels, multilayer caching mechanism can be effectively realized, build height
The cache hierarchy frame of effect；Using three-dimensional model information data pre-fetching mechanism, fetching portion data from database service in advance
The number in three-dimensional serviced component access three-dimensional space data library is reduced in memory, it can using the operation of relevant database SQL query
Three-dimensional element similar in three-dimensional space is extracted with rapid batch, avoids repeatedly accessing database；Network front end caching: using gradually
The data for obtaining certain proportion scale, are spliced in client, and the area data once accessed is buffered in client local,
Reduce the interaction times between network transmission volume and network；
Extensive three-dimensional virtual scene progressive download and transmission mechanism: d engine can using layering lod loading method
Judged according to user's view distance, to be loaded into different model and textures, model grade is divided into according to model meshes number
Three-level LOD1 LOD2 LOD3；Model pinup picture is divided into 1024x1024 512x512 256x256 simultaneously；If user's view distance
It will call lod3 texturing that will call 256x256 size material higher than 10m model；The mould for just using the low material of grid number small in this way
Type can load more multi-model faster；
5. three-dimensional visualization and application management
Three-dimensional visualization and application management mainly realize the displaying of virtual tourism guide to visitors, the amusement and recreation based on three-dimensional scenic,
The consumption service of tourist attraction periphery and information (text, picture, video and three-dimensional scenic etc.) dynamically load management；Emphasis solves three
The problems such as quick load and three-dimensional scenic for tieing up scene and threedimensional model roam；
(1) threedimensional model load strategy
Threedimensional model includes solid information, link information, attribute information, passes through solid to threedimensional model and connection
Feature extraction, using the algorithm of progressive compression geometry and link information, and the attribute of texture, precision, coordinate etc. is combined to compress
Algorithm carries out effective compression processing to the three-dimensional modeling data of server end storage；Geometry, connection, attributes extraction base
Three-dimensional scenic and model attributes identification code, the transmission of implementation model quick-searching are established on plinth；In order to ensure to each client
The correctness of data transmission, and prevent the repetition of data from transmitting, normalization processing is carried out to data in server end, is guaranteed three-dimensional
The fast and effective load of scene and model；
(2) three-dimensional range
By roaming time axis, scene set loads trigger switch in roaming scence, and roaming camera once triggers scene
Middle loaded switches will load the model of next scene in the route, without rendering after the completion of load；It will not be accounted for for rending model
With system running memory；Rendering trigger switch is touched when current scene roaming finishes, next scene carries out rendering user can nothing
Any waiting is needed to continue to roam next scene；
Threedimensional model preview:
Threedimensional model preview process, engine owners backstage allocation models preview relevant information are simultaneously saved to database, such as:
Model preview triggers approach, preview model path etc..When three-dimensional program initialization, to background request model preview related data,
It passes data to d engine and carries out the initialization of model preview correlation；User is operated by UI or the touchings such as mouse, keyboard operation
Send out model preview, relevant information initialization model preview scene that d engine includes according to trigger event, load preview model,
Scene is back to three-dimensional program three-dimensional program after the completion of model load to repeat to render the scene, generation can comprehensive, multi-angle
The interface of preview model is for program user preview；
Region automatic roaming:
Region automatic roaming process, when engine owners configure automatic roaming key point camera position and the position by backstage
The direction of camera is simultaneously saved to database；When three-dimensional program initialization, automatic roaming related data is obtained from backstage and is initialized
Automatic roaming module；Program user starts automatic roaming request by the transmission of the interface UI, and d engine starts certainly after receiving request
Animation trip；
Optimization switches between region:
Switching flow brief introduction between region: picture brief introduction and the character introduction in each region etc. is arranged by backstage in engine owners
Information simultaneously save to database, user operated by UI it is Zone switched, to the relevant information in the background request region, d engine
Request model load progress and real-time exhibition；Model load is completed, and camera jumps to the region；
Optimize map handoff scenario:
Map Switch is to three-dimensional scenic process brief introduction: the picture brief introduction of scenic spot hot spot is arranged by backstage for engine owners
With the relevant informations such as character introduction and save to database, user clicks the hot spot on map, and mapping module obtains the heat
Door sight spot information, feeds back to three-dimensional program；The corresponding picture brief introduction of the three-dimensional PROGRAMMED REQUESTS hot spot, character introduction and model
Data, model load is completed, into the hot spot；
6. united portal
System united portal includes uniform data center and uniform user interfaces, shows and issues by the website WEB/WAP
Virtual tour system, and third party's business platform can be linked, united portal supports Android and iOS system application.
(1) united portal system
United portal uses SOA framework, designs by four-layer structure, including data Layer, podium level, service layer and application layer；
A, data Layer: including four class data
Fundamental Geographic Information Data: including tourist attraction geographical location, total arrangement, scenic spots plan and sight spot distribution etc.
Multi-scale geographic information data necessary to information both include the geography such as sight spot zoning, the tourist road stored with vector format
Factor data also includes the data such as remote sensing image, the digital terrain model stored with grid format；
Three-dimensional modeling data: three-dimensional modeling data mainly includes virtual tourism scenic spot three-dimensional scenic, scenic area and scenic spot, all kinds of sets
Apply equal geometrical models and data texturing, wherein geometrical model supports a variety of commercial or general datas such as 3ds, Obj, OSG and IVE
Format, texture then support many generals image data format such as BMP, JPG, PNG and TGA；
Multi-medium data: including the various multi-medium datas to describe in detail to tourist attraction, above-mentioned general image is removed
Outside data format, the web datas formats such as video and audios file format and HTML such as WMA, WAV, AVI, FLA are also supported；
Tourist attraction information: including internal control application data, various multimedias that the scenic spot externally serviced is discussed in detail
Data, including general image, video and audio and webpage format；
B, podium level: podium level is the core that system is realized, including data engine, agent data, what comes into a driver's management, viewpoint control
6 functional modules such as system, 3 d rendering engine and multimedia display；
Data engine: the main input and output for realizing Various types of data can make system branch by the extension to data engine
Hold further types of data；
Agent data: it is the nucleus module of system data scheduling, management, is provided for modules such as what comes into a driver's management, three-dimensional renderings
Data are supported, including the functions such as data search, calling, inquiry and statistics；When the modules such as what comes into a driver's management, three-dimensional rendering need using
When a certain data, data application is submitted to agent data by interface, agent data module is first in the data pool of its maintenance
It scans for, if data have been loaded into memory, then at once to the module feedback related data for proposing data application；Such as data
It not yet loads, then the data input function for calling data to draw, load related data into data pool and is fed back；Meanwhile data generation
Reason module data pool (data buffer storage) is safeguarded, when a certain data do not use, then have agent data module release with
Recycle memory；Agent data module uses multi-threading, effectively improves the efficiency that data are loaded, safeguarded；
What comes into a driver's management: for constructing, safeguarding the logical relation of three-dimensional scenic；What comes into a driver's management module passes through parsing three-dimensional scenic
Configuration file constructs three-dimensional scenic using tree, and according to many factors such as scene configuration relationship, viewpoint position, judgement
Scene shows relationship, the level of detail that both which scene was shown, which scene is not shown and scene is shown；Meanwhile what comes into a driver's pipe
Reason module also safeguards that the incidence relation between three-dimensional scenic and multimedia information data judges whether to need according to user's operation
Load, display multimedia messages, and the multimedia messages display module of application layer is notified to carry out display processing；
Viewpoint/interactive controlling: supporting multi-point touch interaction, there is user gesture to carry out identification function, can be by multi-point touch
Gesture identification is converted to operation or other interactive operations, control command to viewpoint, touches to avoid different operating system and multiple spot
Interaction data difference brought by equipment is controlled, to improve system to the adaptability of different application environment；
3 d rendering engine: it is mainly used for the photo-realistic images of drawing three-dimensional scene；In this system design, three-dimensional rendering
Engine is separated with what comes into a driver's management, viewpoints' integration, actually realizes the separation of data and method for drafting, therefore 3 d rendering engine
It can be developed according to demand, in the case where meeting interface and data standard using the difference 3D such as OpenGL, D3D API,
To adapt to different application environments；
Multimedia display: providing all kinds of multimedia documents, the display of data and interactive function, supports to general image, view
The display of frequency and webpage；
C, service layer: service layer is packaged function provided by podium level, using service form as types of applications system
Support is provided, wherein mainly including three classes service: Visualization Service, data service and interactive controlling service；
D, application layer: application layer includes three-dimensional guide to visitors display platform and management and two modules of application service platform；
Three-dimensional guide to visitors display platform: main that the virtual emulation number of cultural attractions and tourist attraction based on three-dimensional is provided
Word interactive service, combining geographic information technology is in a manner of completely new guide to visitors, and by the theme culture at scenic spot, Amenities, characteristic is excellent
The depth of gesture authentic image is shown；
Management and application service platform: system-oriented administrative staff provide the management function of system data, specifically include that
The data management functions such as relevant information typing, modification and the backup at scenic spot, geography information, the management function of three-dimensional modeling data,
Data correlation relation editting function and system metadata visual analyzing function etc.；
(2) mobile solution platform
Three-dimensional artificial engine based on independent research and " loaded on intelligent wireless terminal device threedimensional model method and
System " technology, solves that all kinds of threedimensional model precision are high, data volume is big, and service efficiency is not high on mobile terminal of mobile telephone asks
Topic realizes the extensive three-dimensional scenic output conversion and externally publication of mobile intelligent terminal；
Network virtual tourism service system mobile client have hot spot promotion, route planning, guide to visitors navigation, VR experience and
The functions such as service guide.
This patent makes full use of modern information technologies, virtual reality technology, and three-dimensional simulation technique passes through simulation and super reality
The tourist attraction three-dimensional virtual scene based on three-dimensional modeling is established in the realization of scape, constructs virtual tourism environment, builds virtual tourism
Service platform realizes web-based complex scene real-time simulation and interaction.It proposes tourist attraction virtual roaming mode, makes tourist
It stays indoors, honourable beautiful scenery can be browsed in the virtual environment of 3 D stereo, has a taste of long culture, effectively promotion tourist attraction
Public service is horizontal.Virtual tourism on network mode and path are explored simultaneously, is established for the realization of China's virtual tourism vision
Basis.
Detailed description of the invention
Fig. 1 is the network virtual tourism service system general frame figure of this patent
Fig. 2 is the system business architecture diagram of this patent
Fig. 3 is the system function architecture diagram of this patent
Fig. 4 is the normalized processing frame diagram of this patent
Fig. 5 is the data structure of the data center of this patent
Fig. 6 is the dedicated core engine structure figure of virtual tourism of this patent
Fig. 7 is the dedicated core engine logic interface schema of virtual tourism of this patent
Fig. 8 is that the threedimensional model of this patent constitutes and applies relational graph
Fig. 9 is that the server end of this patent preloads policy map
Figure 10 is the three-dimensional scenic roaming architecture figure of this patent
Figure 11 is the threedimensional model preview process flow diagram of this patent
Figure 12 is the region automatic roaming flow chart of this patent
Figure 13 is switching flow figure between the optimization region of this patent
Figure 14 is the optimization map handoff scenario flow chart of this patent
Figure 15 is the united portal structure chart of this patent
Figure 16 is that the Unified Network virtual tourism portal of this patent realizes the end effect PC effect picture
Figure 17 is the realization effect case diagram of this patent
Figure 18 is the VR experience effect figure of this patent
Specific embodiment
A kind of network virtual touring system and its construction method, include the following steps:
(1) tourist attraction three-dimensional scene models are created
Using oblique photograph technology of taking photo by plane, tourist attraction three dimensional topographic data is acquired.Using three-dimensional laser scanning technique, adopt
Collect the data such as tourist attraction building, trees, vegetation, communal facility and service facility, comprehensive tourist attraction three dimensional topographic data with
Three-dimensional modeling data constructs virtual tourism three-dimensional scenic.
(2) building network virtual tourism frame
1. system general frame
Network virtual tourism service system include: information resources typing, data acquisition with normalization processing, data center,
The part such as core engine, three-dimensional visualization and application management and united portal forms.Network virtual tourism service system totality frame
Structure is as shown in Figure 1；
2. system business framework
System mixes reality technology, three-dimensional modeling emulation technology structure using d engine as core, using three-dimensional panorama outdoor scene
Digital virtual scenic spot is built, realizes the virtual tour system based on internet and mobile Internet.Realize terminal model in system foreground
Rendering, virtual tourism experience, three-dimensional of travelling guide to visitors, voice profile and user's interaction etc..System background implementation model depositary management reason, void
Quasi- tourism scene management and tourist service platform management etc..D engine platform realize threedimensional model management, three-dimensional scenic management,
Camera management, memory management, animation management and user's interaction etc..Data interaction realizes that system is interacted with the Various types of data of user,
System business framework is as shown in Figure 2；
3. system function framework
System is that B/S framework is made of internet foreground, back-stage management two large divisions.Internet foreground is deployed in public mutual
In networking, external data interface supports microblogging, wechat, APP, and client can support general Windows/Android/iOS, uses
User data center can be deployed in public internet and also be deployed in internal lan, user can set according to demand related data as
Publicly-owned or private permission.System function framework is as shown in Figure 3；
Model management: there are the management functions such as tourist attraction three-dimensional scenic, facility model.
Scene management: there is threedimensional model load, conversion, the configuration of scene organization design, camera hotspot location, model grade
It shows, memory loads the functions such as release.
Content Management: there is landscape video active information service system of scenic introduction, scenic spot cultural activity, service guide, Trip distribution and palpus of visiting a park
The functions such as know.
Tourism guide to visitors: there is theme scenic spot, classical sight spot introduction, hot spot promotion, Panoramic Warping, travel-line planning, scape
The functions such as the navigation of area's guide to visitors, classic travel route visit and VR experience.
Virtual community: there is tourism strategy, tourism to form a team, my world, my collection, I form a team, my footprint etc.
Function.
System administration: it mainly realizes user's registration, log in, user authority management, System menu management and system operatio day
The functions such as will record management.
(3) network virtual touring system designs
1. information resources input system
Data information data digitalization: in the way of digital scan, words input etc. to the various data of tourist attraction into
Row processing, forms digitized document data.
3 D scanning system: the Airborne Laser Scan is utilized, to the building of tourist attraction, historical relic, all kinds of service facilities
It is scanned, forms corresponding point cloud data, establish data basis for the three-dimensional modeling of tourist attraction.
Geography of tourism information acquisition system: building tourist attraction GIS-Geographic Information System, emphasis are the amendment of scenic spot coordinate points,
The accurate coordinate-system in scenic spot is established, is laid the foundation for scenic spot three-dimensional guide to visitors.
2. data acquisition and normalization
Data acquisition is handled with normalization: carrying out specification to unstructured, the semi-structured and structured data of acquisition typing
Change processing.Normalized processing frame is as shown in Figure 4；
3. data center
Data center stores the data type of large amount of complex, which passes through its external file data type and rule
Then, a variety of multimedia messages are managed, and additions and deletions are provided for various information resources and change Cha Gongneng.
Using the mechanism of subfield, Multiple Value Field and variable-length field, allow to create many different types of unstructured
Or arbitrary format field, so that the very strict table structure of relational database is breached, so that unstructured data is able to
Storage and management.
Unstructured and structural data is all defined as storage unit, so that the basic element of non-structural database is exactly
Media file itself, can the various unstructured datas of storage and management, realize System data management to content pipe
The conversion of reason.
The data structure of data center is as shown in Figure 5；
4. core engine
Network virtual tourism platform is run based on internet and mobile Internet, and scene data amount is very big, virtually
Roaming, virtual guide to visitors and real-time three-dimensional scene human-computer interaction are its basic functions, but apply above-mentioned any engine technique, all
There is that need to download huge support environment, different operating system and browser need to download the plug-in unit of different editions, call
Different graphic routine interface brings very big limitation for the exploitation of system.
Core engine progressive transmission mechanism with high performance, make to need when dummy scene roaming to preload, transmission and
The scene and model data amount of caching reach minimum, are loaded by multithreading streaming, overflow tourist in virtual scene glibly
Trip, while to network bandwidth requirement minimum.
(1) core engine structure
The dedicated core engine emphasis of virtual tourism based on WebGL exploitation solve virtual scene threedimensional model precision it is high,
Data volume is big, the not high problem of service efficiency on internet, PC terminal and mobile terminal.The engine is without installing any plug-in unit
It can directly be run by Internet-browser, be suitable for PC and mobile phone terminal.Engine by api interface layer, logic control layer and
Application-interface layer composition, main functional modules have: model cootrol, model load, collision detection, scene management, memory management, phase
Machine control etc..
Class libraries, programming interface and the GIS GIS data interface provided based on WebGL realizes engine bottom architecture
With design.In addition many three-dimensional scenics, model built in engine be such as: building, historical relic, lake water, four seasons tree, compass, day sylphon
Threedimensional model.
Logic control is mainly realized camera position and visual field management and is controlled, scene location controls, camera physical impacts are examined
Survey, three-dimensional scenic, the management of model hierarchical loading, scene switching management, navigation guide to visitors management, the management of GIS GIS-Geographic Information System with
And the functions such as memory load release management.
Application interface mainly realizes that hot spot switching, automatic roaming, manual navigation, location-based service, Map Services, scene are cut
It changes, navigate guide to visitors and camera direction orientation displaying function.
The dedicated core engine structure of virtual tourism is as shown in fig. 6, virtual tourism dedicated core engine logic interface such as Fig. 7 institute
Show；
(2) key technology
The progressive download of virtual scene designs: virtual tourism scene is big, building and tree modelling are more, data volume greatly with use
The contradiction of family end memory space embodies to become apparent in the mobile terminal of small memory space, in order to solve the contradiction, to void
Quasi- scene real time roaming walking first carries out multiresolution classification modeling to model using progressive download mechanism is based on, further according to
Object is at a distance from viewpoint, the factors such as the deviation angle of object and sight, while not reducing roaming visual effect, on demand under
Carrier has the model data of different resolution, to reduce the network delay of scene downloading.
Light-weight technologg technology: due to the network speed of internet and the limitation of bandwidth, online (super) extensive WebVR virtual field
The instant downloading of scape and threedimensional model is always a bottleneck problem.The virtual tourism scene of threedimensional model building is in Web page
It is upper to be played glibly, the dough sheet number and texture of scene must be reduced, and model of place is made using reuse mechanism.According to light
Quantization modeling → WebVR Script Programming → back-stage management realizes virtual field with supporting framework → light-weighted engine scheduling technology
The 3D of scape is roamed.Design exempts from plug-in unit simulation engine technology based on WebGL efficiently to dispatch the other scene of millions of patch-levels,
User is set to become more smooth in online virtual roaming experience.
Intelligent buffer technology: caching technology is to provide the most effective means of mobile intelligent terminal three-dimensional performance, simulation engine
Network Three-dimensional information service system is divided into multiple separate physical levels, multilayer caching mechanism can be effectively realized, build height
The cache hierarchy frame of effect.Using three-dimensional model information data pre-fetching mechanism, fetching portion data from database service in advance
The number in three-dimensional serviced component access three-dimensional space data library is reduced in memory, it can using the operation of relevant database SQL query
Three-dimensional element similar in three-dimensional space is extracted with rapid batch, avoids repeatedly accessing database.Network front end caching: using gradually
The data for obtaining certain proportion scale, are spliced in client, and the area data once accessed is buffered in client local,
Reduce the interaction times between network transmission volume and network.
Extensive three-dimensional virtual scene progressive download and transmission mechanism: d engine can using layering lod loading method
Judged according to user's view distance, to be loaded into different model and textures, model grade is divided into according to model meshes number
Three-level LOD1 LOD2 LOD3.Model pinup picture is divided into 1024x1024 512x512 256x256 simultaneously.If user's view distance
It will call lod3 texturing that will call 256x256 size material higher than 10m model.The mould for just using the low material of grid number small in this way
Type can load more multi-model faster.
5. three-dimensional visualization and application management
Three-dimensional visualization and application management mainly realize the displaying of virtual tourism guide to visitors, the amusement and recreation based on three-dimensional scenic,
The consumption service of tourist attraction periphery and information (text, picture, video and three-dimensional scenic etc.) dynamically load management.Emphasis solves three
The problems such as quick load and three-dimensional scenic for tieing up scene and threedimensional model roam.Threedimensional model constitutes and applies relationship such as Fig. 8 institute
Show；
(1) threedimensional model load strategy
Threedimensional model includes solid information, link information, attribute information, passes through solid to threedimensional model and connection
Feature extraction, using the algorithm of progressive compression geometry and link information, and the attribute of texture, precision, coordinate etc. is combined to compress
Algorithm carries out effective compression processing to the three-dimensional modeling data of server end storage；Geometry, connection, attributes extraction base
Three-dimensional scenic and model attributes identification code, the transmission of implementation model quick-searching are established on plinth；In order to ensure to each client
The correctness of data transmission, and prevent the repetition of data from transmitting, normalization processing is carried out to data in server end, is guaranteed three-dimensional
The fast and effective load of scene and model.Server end preloads strategy as shown in Figure 9；
(2) three-dimensional range
By roaming time axis, scene set loads trigger switch in roaming scence, and roaming camera once triggers scene
Middle loaded switches will load the model of next scene in the route, without rendering after the completion of load.It will not be accounted for for rending model
With system running memory.Rendering trigger switch is touched when current scene roaming finishes, next scene carries out rendering user can nothing
Any waiting is needed to continue to roam next scene.As shown in Figure 10；
Threedimensional model preview:
Threedimensional model preview process, engine owners backstage allocation models preview relevant information are simultaneously saved to database, such as:
Model preview triggers approach, preview model path etc..When three-dimensional program initialization, to background request model preview related data,
It passes data to d engine and carries out the initialization of model preview correlation.User is operated by UI or the touchings such as mouse, keyboard operation
Send out model preview, relevant information initialization model preview scene that d engine includes according to trigger event, load preview model,
Scene is back to three-dimensional program three-dimensional program after the completion of model load to repeat to render the scene, generation can comprehensive, multi-angle
The interface of preview model is for program user preview.Specific process flow is as shown in figure 11；
Region automatic roaming:
Region automatic roaming process, when engine owners configure automatic roaming key point camera position and the position by backstage
The direction of camera is simultaneously saved to database.When three-dimensional program initialization, automatic roaming related data is obtained from backstage and is initialized
Automatic roaming module.Program user starts automatic roaming request by the transmission of the interface UI, and d engine starts certainly after receiving request
Animation trip.Detailed process is as shown in figure 12；
Optimization switches between region:
Switching flow brief introduction between region: picture brief introduction and the character introduction in each region etc. is arranged by backstage in engine owners
Information simultaneously save to database, user operated by UI it is Zone switched, to the relevant information in the background request region, d engine
Request model load progress and real-time exhibition.Model load is completed, and camera jumps to the region.Detailed process is as shown in figure 13；
Optimize map handoff scenario:
Map Switch is to three-dimensional scenic process brief introduction: the picture brief introduction of scenic spot hot spot is arranged by backstage for engine owners
With the relevant informations such as character introduction and save to database, user clicks the hot spot on map, and mapping module obtains the heat
Door sight spot information, feeds back to three-dimensional program.The corresponding picture brief introduction of the three-dimensional PROGRAMMED REQUESTS hot spot, character introduction and model
Data, model load is completed, into the hot spot.Detailed process is as shown in figure 14；
6. united portal
System united portal includes uniform data center and uniform user interfaces, shows and issues by the website WEB/WAP
Virtual tour system, and third party's business platform can be linked, united portal supports Android and iOS system application.
(1) united portal system
United portal system structure is as shown in figure 15；
United portal uses SOA framework, designs by four-layer structure, including data Layer, podium level, service layer and application layer.
A, data Layer: including four class data
Fundamental Geographic Information Data: including tourist attraction geographical location, total arrangement, scenic spots plan and sight spot distribution etc.
Multi-scale geographic information data necessary to information both include the geography such as sight spot zoning, the tourist road stored with vector format
Factor data also includes the data such as remote sensing image, the digital terrain model stored with grid format.
Three-dimensional modeling data: three-dimensional modeling data mainly includes virtual tourism scenic spot three-dimensional scenic, scenic area and scenic spot, all kinds of sets
Apply equal geometrical models and data texturing, wherein geometrical model supports a variety of commercial or general datas such as 3ds, Obj, OSG and IVE
Format, texture then support many generals image data format such as BMP, JPG, PNG and TGA.
Multi-medium data: including the various multi-medium datas to describe in detail to tourist attraction, above-mentioned general image is removed
Outside data format, the web datas formats such as video and audios file format and HTML such as WMA, WAV, AVI, FLA are also supported.
Tourist attraction information: including internal control application data, various multimedias that the scenic spot externally serviced is discussed in detail
Data, including general image, video and audio and webpage format.
B, podium level: podium level is the core that system is realized, including data engine, agent data, what comes into a driver's management, viewpoint control
6 functional modules such as system, 3 d rendering engine and multimedia display.
Data engine: the main input and output for realizing Various types of data can make system branch by the extension to data engine
Hold further types of data.
Agent data: it is the nucleus module of system data scheduling, management, is provided for modules such as what comes into a driver's management, three-dimensional renderings
Data are supported, including the functions such as data search, calling, inquiry and statistics.When the modules such as what comes into a driver's management, three-dimensional rendering need using
When a certain data, data application is submitted to agent data by interface, agent data module is first in the data pool of its maintenance
It scans for, if data have been loaded into memory, then at once to the module feedback related data for proposing data application；Such as data
It not yet loads, then the data input function for calling data to draw, load related data into data pool and is fed back.Meanwhile data generation
Reason module data pool (data buffer storage) is safeguarded, when a certain data do not use, then have agent data module release with
Recycle memory.Agent data module uses multi-threading, effectively improves the efficiency that data are loaded, safeguarded.
What comes into a driver's management: for constructing, safeguarding the logical relation of three-dimensional scenic.What comes into a driver's management module passes through parsing three-dimensional scenic
Configuration file constructs three-dimensional scenic using tree, and according to many factors such as scene configuration relationship, viewpoint position, judgement
Scene shows relationship, the level of detail that both which scene was shown, which scene is not shown and scene is shown.Meanwhile what comes into a driver's pipe
Reason module also safeguards that the incidence relation between three-dimensional scenic and multimedia information data judges whether to need according to user's operation
Load, display multimedia messages, and the multimedia messages display module of application layer is notified to carry out display processing.
Viewpoint/interactive controlling: supporting multi-point touch interaction, there is user gesture to carry out identification function, can be by multi-point touch
Gesture identification is converted to operation or other interactive operations, control command to viewpoint, touches to avoid different operating system and multiple spot
Interaction data difference brought by equipment is controlled, to improve system to the adaptability of different application environment.
3 d rendering engine: it is mainly used for the photo-realistic images of drawing three-dimensional scene.In this system design, three-dimensional rendering
Engine is separated with what comes into a driver's management, viewpoints' integration, actually realizes the separation of data and method for drafting, therefore 3 d rendering engine
It can be developed according to demand, in the case where meeting interface and data standard using the difference 3D such as OpenGL, D3D API,
To adapt to different application environments.
Multimedia display: providing all kinds of multimedia documents, the display of data and interactive function, supports to general image, view
The display of frequency and webpage.
C, service layer: service layer is packaged function provided by podium level, using service form as types of applications system
Support is provided, wherein mainly including three classes service: Visualization Service, data service and interactive controlling service.
D, application layer: application layer includes three-dimensional guide to visitors display platform and management and two modules of application service platform.
Three-dimensional guide to visitors display platform: main that the virtual emulation number of cultural attractions and tourist attraction based on three-dimensional is provided
Word interactive service, combining geographic information technology is in a manner of completely new guide to visitors, and by the theme culture at scenic spot, Amenities, characteristic is excellent
The depth of gesture authentic image is shown.
Management and application service platform: system-oriented administrative staff provide the management function of system data, specifically include that
The data management functions such as relevant information typing, modification and the backup at scenic spot, geography information, the management function of three-dimensional modeling data,
Data correlation relation editting function and system metadata visual analyzing function etc..Unified Network virtual tourism portal is realized
The end effect PC is as shown in figure 16；
(2) mobile solution platform
Three-dimensional artificial engine based on independent research and " loaded on intelligent wireless terminal device threedimensional model method and
System " (application number of invention patent: the technologies such as 201610438526.7) solve that all kinds of threedimensional model precision are high, data volume is big,
The not high problem of service efficiency on mobile terminal of mobile telephone realizes the extensive three-dimensional scenic output conversion of mobile intelligent terminal
With external publication.
Network virtual tourism service system mobile client have hot spot promotion, route planning, guide to visitors navigation, VR experience and
The functions such as service guide realize that effect case is as shown in figure 17, VR experience effect is as shown in figure 18.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to the technology of the present invention side
The various changes and improvements that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (1)
1. a kind of network virtual touring system and its construction method, include the following steps:
(1) tourist attraction three-dimensional scene models are created
Using oblique photograph technology of taking photo by plane, tourist attraction three dimensional topographic data is acquired；Using three-dimensional laser scanning technique, trip is acquired
Swim the data such as scenic spot building, trees, vegetation, communal facility and service facility, comprehensive tourist attraction three dimensional topographic data and three-dimensional
Model data constructs virtual tourism three-dimensional scenic；
(2) building network virtual tourism frame
1. system general frame
Network virtual tourism service system includes: information resources typing, data acquisition and normalization processing, data center, core
The part such as engine, three-dimensional visualization and application management and united portal forms；Network virtual tourism service system general frame is such as
Shown in Fig. 1；
2. system business framework
System mixes reality technology using d engine as core, using three-dimensional panorama outdoor scene, three-dimensional modeling emulation technology constructs number
The virtual tour system based on internet and mobile Internet is realized at the virtual scenic spot of word；The rendering of system foreground realization terminal model,
Virtual tourism experience, three-dimensional guide to visitors of travelling, voice profile and user's interaction etc.；System background implementation model depositary management reason, virtual trip
Swim scene management and tourist service platform management etc.；D engine platform realizes threedimensional model management, three-dimensional scenic management, camera
Management, memory management, animation management and user's interaction etc.；Data interaction realizes that system is interacted with the Various types of data of user；
3. system function framework
System is that B/S framework is made of internet foreground, back-stage management two large divisions；Internet foreground is deployed in public internet
On, external data interface supports microblogging, wechat, APP, and client can support general Windows/Android/iOS, number of users
Public internet can be deployed according to center and is also deployed in internal lan, and user can set related data to be publicly-owned according to demand
Or private permission；
Model management: there are the management functions such as tourist attraction three-dimensional scenic, facility model；
Scene management: there is threedimensional model load, conversion, the configuration of scene organization design, camera hotspot location, model grade exhibition
Show, memory loads the functions such as release；
Content Management: there is landscape video active information service system of scenic introduction, scenic spot cultural activity, service guide, Trip distribution and Notice to Visitors etc.
Function；
Tourism guide to visitors: there is theme scenic spot, classical sight spot introduction, hot spot promotion, Panoramic Warping, travel-line planning, scenic spot to lead
Look at navigation, classic travel route visit and VR experience etc. functions；
Virtual community: the strategy that has the function of to travel, tourism form a team, my world, my collection, I form a team, my footprint etc.；
System administration: mainly realizing user's registration, log in, user authority management, System menu management and System Operation Log note
The functions such as record management；
(3) network virtual touring system designs
1. information resources input system
Data information data digitalization: in the way of digital scan, words input etc. to the various data of tourist attraction at
Reason forms digitized document data；
3 D scanning system: utilizing the Airborne Laser Scan, carries out to the building of tourist attraction, historical relic, all kinds of service facilities
Scanning, forms corresponding point cloud data, establishes data basis for the three-dimensional modeling of tourist attraction；
Geography of tourism information acquisition system: building tourist attraction GIS-Geographic Information System, emphasis are the amendment of scenic spot coordinate points, are established
The accurate coordinate-system in scenic spot lays the foundation for scenic spot three-dimensional guide to visitors；
2. data acquisition and normalization
Data acquisition is handled with normalization: being carried out at normalization to unstructured, the semi-structured and structured data of acquisition typing
Reason；
3. data center
Data center stores the data type of large amount of complex, which passes through its external file data type and rule, pipe
A variety of multimedia messages are managed, and additions and deletions are provided for various information resources and change Cha Gongneng；
Using the mechanism of subfield, Multiple Value Field and variable-length field, allow to create it is many different types of non-structured or
The field of arbitrary format, so that the very strict table structure of relational database is breached, so that unstructured data is stored
And management；
Unstructured and structural data is all defined as storage unit, so that the basic element of non-structural database is exactly media
File itself, can the various unstructured datas of storage and management, realize System data management to Content Management
Conversion；
4. core engine
Network virtual tourism platform is run based on internet and mobile Internet, and scene data amount is very big, virtual roaming,
Virtual guide to visitors and real-time three-dimensional scene human-computer interaction are its basic functions, but apply above-mentioned any engine technique, are all existed
Need to download huge support environment, different operating system and browser need to download the plug-in unit of different editions, call different
Graphic package interface brings very big limitation for the exploitation of system；
Core engine progressive transmission mechanism with high performance makes to need to preload when dummy scene roaming, transmits and cache
Scene and model data amount reach minimum, loaded by multithreading streaming, roam tourist in virtual scene glibly, together
When to network bandwidth requirement minimum；
(1) core engine structure
The dedicated core engine emphasis of virtual tourism based on WebGL exploitation solves virtual scene threedimensional model precision height, data
Amount is big, the not high problem of service efficiency on internet, PC terminal and mobile terminal；The engine is without installing any plug-in unit
It is directly run by Internet-browser, is suitable for PC and mobile phone terminal；Engine is by api interface layer, logic control layer and application
Interface layer composition, main functional modules have: model cootrol, model load, collision detection, scene management, memory management, camera control
System etc.；
Class libraries, programming interface and the GIS GIS data interface provided based on WebGL is realized engine bottom architecture and set
Meter；In addition many three-dimensional scenics, model built in engine be such as: building, historical relic, lake water, four seasons tree, compass, day sylphon three-dimensional
Model；
Logic control is mainly realized camera position and visual field management and is controlled, scene location controls, the detection of camera physical impacts, three
Tie up scene, the management of model hierarchical loading, scene switching management, navigation guide to visitors management, the management of GIS GIS-Geographic Information System and memory
Load the functions such as release management；
Application interface is mainly realized hot spot switching, automatic roaming, manual navigation, location-based service, Map Services, scene switching, is led
Boat guide to visitors and camera direction orientation show function；
(2) key technology
The progressive download of virtual scene designs: virtual tourism scene is big, building and tree modelling are more, data volume greatly and user terminal
The contradiction of memory space embodies to become apparent in the mobile terminal of small memory space, in order to solve the contradiction, to virtual field
The walking of scape real time roaming first carries out multiresolution classification modeling to model, further according to object using progressive download mechanism is based on
With at a distance from viewpoint, the factors such as the deviation angle of object and sight descend carrier on demand while not reducing roaming visual effect
There is the model data of different resolution, to reduce the network delay of scene downloading；
Light-weight technologg technology: due to the network speed of internet and the limitation of bandwidth, online (super) extensive WebVR virtual scene with
The instant downloading of threedimensional model is always a bottleneck problem；The virtual tourism scene of threedimensional model building is enterprising in Web page
Row plays glibly, must reduce the dough sheet number and texture of scene, and make model of place using reuse mechanism；According to lightweight
Modeling → WebVR Script Programming → back-stage management realizes virtual scene with supporting framework → light-weighted engine scheduling technology
3D roaming；Design exempts from plug-in unit simulation engine technology based on WebGL efficiently to dispatch the other scene of millions of patch-levels, uses
Family becomes more smooth in online virtual roaming experience；
Intelligent buffer technology: caching technology is to provide the most effective means of mobile intelligent terminal three-dimensional performance, and simulation engine is by net
Network three-dimensional information service system is divided into multiple separate physical levels, can effectively realize multilayer caching mechanism, builds efficient
Cache hierarchy frame；Using three-dimensional model information data pre-fetching mechanism, in advance including fetching portion data in database service
The number for reducing three-dimensional serviced component access three-dimensional space data library is deposited, it can be fast using the operation of relevant database SQL query
Three-dimensional element similar in fast batch extracting three-dimensional space avoids repeatedly accessing database；Network front end caching: it uses and gradually obtains
The data of certain proportion scale are spliced in client, and the area data once accessed is buffered in client local, are reduced
Interaction times between network transmission volume and network；
Extensive three-dimensional virtual scene progressive download and transmission mechanism: d engine being capable of basis using layering 1od loading method
User's view distance judges, to be loaded into different model and textures, model grade is divided into three-level according to model meshes number
LOD1 LOD2 LOD3；Model pinup picture is divided into 1024x1024512x512256x256 simultaneously；If user's view distance is higher than
10m model will call lod3 texturing that will call 256x256 size material；The model energy for just using the low material of grid number small in this way
Enough load more multi-models faster；
5. three-dimensional visualization and application management
The displaying of virtual tourism guide to visitors, the amusement and recreation based on three-dimensional scenic, tourism are mainly realized in three-dimensional visualization and application management
The consumption service of scenic spot periphery and information (text, picture, video and three-dimensional scenic etc.) dynamically load management；Emphasis solves three dimensional field
The problems such as quick load and three-dimensional scenic roaming of scape and threedimensional model；
(1) threedimensional model load strategy
Threedimensional model includes solid information, link information, and attribute information passes through the spy of solid and connection to threedimensional model
Sign is extracted, and using the algorithm of progressive compression geometry and link information, and combines the attribute compression algorithm of texture, precision, coordinate etc.,
Effective compression processing is carried out to the three-dimensional modeling data of server end storage；It is built on the basis of geometry, connection, attributes extraction
Vertical three-dimensional scenic and model attributes identification code, the transmission of implementation model quick-searching；In order to ensure being passed to each client data
Defeated correctness, and prevent the repetition of data from transmitting carries out normalization processing to data in server end, guarantee three-dimensional scenic and
The fast and effective load of model；
(2) three-dimensional range
By roaming time axis, scene set loads trigger switch in roaming scence, and roaming camera adds once triggering in scene
Load switch will load the model of next scene in the route, without rendering after the completion of load；It will be not take up for rending model and be
System running memory；Rendering trigger switch is touched when current scene roaming finishes, next scene carries out rendering user can be without appointing
How wait continue to roam next scene；
Threedimensional model preview:
Threedimensional model preview process, engine owners backstage allocation models preview relevant information are simultaneously saved to database, such as: model
Preview triggers approach, preview model path etc..When three-dimensional program initialization, to background request model preview related data, it will count
The initialization of model preview correlation is carried out according to d engine is transferred to；User is operated by UI or the trigger modes such as mouse, keyboard operation
Type preview, relevant information initialization model preview scene that d engine includes according to trigger event, load preview model, model
Scene is back to three-dimensional program three-dimensional program after the completion of load to repeat to render the scene, generation can comprehensive, multi-angle preview
The interface of model is for program user preview；
Region automatic roaming:
Region automatic roaming process, camera when engine owners configure automatic roaming key point camera position and the position by backstage
Direction and save to database；When three-dimensional program initialization, automatic roaming related data is obtained from backstage and is initialized automatic
Roam module；Program user is sent by the interface UI starts automatic roaming request, and d engine starts after receiving request from animation
Trip；
Optimization switches between region:
Switching flow brief introduction between region: the information such as picture brief introduction and the character introduction in each region are arranged by backstage in engine owners
And save to database, user operates Zone switched by UI, and to the relevant information in the background request region, d engine is requested
Model load progress and real-time exhibition；Model load is completed, and camera jumps to the region；
Optimize map handoff scenario:
Map Switch is to three-dimensional scenic process brief introduction: picture brief introduction and the text of scenic spot hot spot are arranged by backstage for engine owners
The relevant informations such as word introduction are simultaneously saved to database, and user clicks the hot spot on map, and mapping module obtains the hot topic scape
Point information, feeds back to three-dimensional program；The corresponding picture brief introduction of the three-dimensional PROGRAMMED REQUESTS hot spot, character introduction and pattern number
According to model load is completed, into the hot spot；
6. united portal
System united portal includes uniform data center and uniform user interfaces, shows and issues by the website WEB/WAP and is virtual
Touring system, and third party's business platform can be linked, united portal supports Android and iOS system application.
(1) united portal system
United portal uses SOA framework, designs by four-layer structure, including data Layer, podium level, service layer and application layer；
A, data Layer: including four class data
Fundamental Geographic Information Data: including information such as tourist attraction geographical location, total arrangement, scenic spots plan and sight spot distributions
Necessary multi-scale geographic information data both include the geographic elements such as sight spot zoning, the tourist road stored with vector format
Data also include the data such as remote sensing image, the digital terrain model stored with grid format；
Three-dimensional modeling data: three-dimensional modeling data mainly includes virtual tourism scenic spot three-dimensional scenic, scenic area and scenic spot, all kinds of facilities etc.
Geometrical model and data texturing, wherein geometrical model supports a variety of commercial or universal data formats such as 3ds, Obj, OSG and IVE,
Texture then supports many generals image data format such as BMP, JPG, PNG and TGA；
Multi-medium data: including the various multi-medium datas to describe in detail to tourist attraction, above-mentioned general purpose image data is removed
Outside format, the web datas formats such as video and audios file format and HTML such as WMA, WAV, AVI, FLA are also supported；
Tourist attraction information: including internal control application data, the various multi-medium datas that the scenic spot externally serviced is discussed in detail,
Including general image, video and audio and webpage format；
B, podium level: podium level be system realize core, including data engine, agent data, what comes into a driver's management, viewpoints' integration,
6 functional modules such as 3 d rendering engine and multimedia display；
Data engine: the main input and output for realizing Various types of data can be such that system supports more by the extension to data engine
The data of polymorphic type；
Agent data: being the nucleus module of system data scheduling, management, provides data for modules such as what comes into a driver's management, three-dimensional renderings
It supports, including the functions such as data search, calling, inquiry and statistics；When the modules such as what comes into a driver's management, three-dimensional rendering are needed using a certain
When data, data application is submitted to agent data by interface, agent data module carries out in the data pool of its maintenance first
Search, if data have been loaded into memory, then at once to the module feedback related data for proposing data application；Not yet such as data
It loads, then the data input function for calling data to draw, load related data into data pool and is fed back；Meanwhile agent data mould
Block safeguards data pool (data buffer storage), when a certain data do not use, then has the release of agent data module to recycle
Memory；Agent data module uses multi-threading, effectively improves the efficiency that data are loaded, safeguarded；
What comes into a driver's management: for constructing, safeguarding the logical relation of three-dimensional scenic；What comes into a driver's management module passes through parsing three-dimensional scenic configuration
File constructs three-dimensional scenic using tree, and according to many factors such as scene configuration relationship, viewpoint positions, judges scene
Display relationship, the level of detail that both which scene was shown, which scene is not shown and scene is shown；Meanwhile what comes into a driver's manages mould
Block also safeguards the incidence relation between three-dimensional scenic and multimedia information data, according to user's operation, judge whether to need to load,
It shows multimedia messages, and the multimedia messages display module of application layer is notified to carry out display processing；
Viewpoint/interactive controlling: supporting multi-point touch interaction, there is user gesture to carry out identification function, can be by multi-point touch gesture
It identifies, be converted to operation or other interactive operations, control command to viewpoint, set to avoid different operating system and multi-point touch
Standby brought interaction data difference, to improve system to the adaptability of different application environment；
3 d rendering engine: it is mainly used for the photo-realistic images of drawing three-dimensional scene；In this system design, 3 d rendering engine
It is separated with what comes into a driver's management, viewpoints' integration, actually realizes the separation of data and method for drafting, therefore 3 d rendering engine can be with
According to demand, it in the case where meeting interface and data standard, is developed using the difference 3D such as OpenGL, D3D API, with suitable
Answer different application environments；
Multimedia display: providing all kinds of multimedia documents, the display of data and interactive function, support to general image, video with
And the display of webpage；
C, service layer: service layer is packaged function provided by podium level, provides by types of applications system of service form
Support, wherein mainly including three classes service: Visualization Service, data service and interactive controlling service；
D, application layer: application layer includes three-dimensional guide to visitors display platform and management and two modules of application service platform；
Three-dimensional guide to visitors display platform: the main virtual emulation digitlization that cultural attractions and tourist attraction based on three-dimensional are provided
Interactive service, combining geographic information technology is in a manner of completely new guide to visitors, and by the theme culture at scenic spot, Amenities, special advantage is true
The depth of real image is shown；
Management and application service platform: system-oriented administrative staff provide the management function of system data, specifically include that scenic spot
The data management functions such as relevant information typing, modification and backup, geography information, the management function of three-dimensional modeling data, data
Incidence relation editting function and system metadata visual analyzing function etc.；
(2) mobile solution platform
Three-dimensional artificial engine based on independent research and " method of threedimensional model is loaded on intelligent wireless terminal device and is
System " technology, solves that all kinds of threedimensional model precision are high, data volume is big, the not high problem of service efficiency on mobile terminal of mobile telephone,
Realize the extensive three-dimensional scenic output conversion and externally publication of mobile intelligent terminal；
Network virtual tourism service system mobile client has hot spot promotion, route planning, guide to visitors navigation, VR experience and service
The functions such as guide.
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| CN110634184B (en) * | 2019-09-11 | 2023-01-17 | 西安恒歌数码科技有限责任公司 | Loading method of mass oblique photography data |
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| CN113485851A (en) * | 2021-05-13 | 2021-10-08 | 北京创奇视界科技有限公司 | Virtual reality adapter for convenient development of simulation three-dimensional engine |
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