CN103559739B - Digital lake three-dimensional visualized simulation method and simulation platform based on OSG - Google Patents
Digital lake three-dimensional visualized simulation method and simulation platform based on OSG Download PDFInfo
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Abstract
The invention provides a digital lake three-dimensional visualized simulation method and simulation platform based on an OSG. The digital lake three-dimensional visualized simulation method includes the following steps that a three-dimensional digital terrain model, a ground feature model and an earth surface derivative model of the region where a lake is located are built; the ground feature model and the earth surface derivative model are loaded to the corresponding geographical positions of the three-dimensional digital terrain model to obtain a three-dimensional digital terrain and geographical environment scene; based on the three-dimensional digital terrain and geographical environment scene, an OSD module is used as a bottom layer three-dimensional rendering engine for scene rendering; meanwhile, an OsgOcean module is utilized to further simulate a simulation rendering water current and weather effect to obtain a three-dimensional digital lake terrain environment scene; a water current scene and a weather effect scene obtained through simulation are updated under the control of a man-machine interaction mechanism. The digital lake three-dimensional visualized simulation method and simulation platform have the advantages of being convenient to operate, easy to expand, efficient, and capable of achieving real-time performance and meeting the requirement for wide-range terrain and mass spatial data three-dimensional visualized simulation.
Description
Technical field
The invention belongs to technical field of virtual reality, be specifically related to a kind of digital lake three-dimensional visualization simulation method based on OSG and emulation platform.
Background technology
Digital lake is an important area level of digital earth, in flood control and disaster reduction, sustainable development, energy utilization etc., have vital role.In recent years, along with the development of 3-D Visualization Simulation analogue technique, the data three-dimensional visual of digital lake mathematical model is born thereupon.That is: main topography and geomorphology three-dimensional demonstration and several data information are displayed by three-dimensional visualization means, thus past in lake, the present and following various actions are described, integrated as: relevant water conservancy business models such as flood dynamical evolution, dam break simulation, water pollutions simulation, Real-time data interface.Therefore, the planning that is lake of digital lake three-dimensional simulation technique and the task of preventing and reducing natural disasters provide decision support more intuitively.
But, in existing digital lake 3-D Visualization Simulation process, the traditional 3 d rendering engine of main employing is as OpenGL (Open Graphics Library), DirectX (full name: Direct eXtension, be called for short DX) play up, mainly there is the following shortcoming in it: 1. equal OO low order engine of right and wrong, and the object in design scenario and operation scenario is more difficult; 2. use element figure, write complex scene more difficult; 3. do not support that LOD (Level of detail), dynamic tailor etc. optimizations play up function; 4. to wide-range terrain and lake rendering efficiency low.
Summary of the invention
For the defect that prior art exists, the invention provides a kind of digital lake three-dimensional visualization simulation method based on OSG and emulation platform, there is the advantage that rendering efficiency is high.
The technical solution used in the present invention is as follows:
The present invention also provides a kind of digital lake three-dimensional visualization simulation method based on OSG, comprises the following steps:
S1, builds the 3-dimensional digital relief block of region, lake; And, build ground object model and earth's surface derivant model;
S2, is loaded into described ground object model and described earth's surface derivant model on the corresponding geographic position of described 3-dimensional digital relief block, obtains 3-dimensional digital landform and geographical environment scene;
S3, in described 3-dimensional digital landform and geographical environment scene basis, uses OSG module to carry out scene rendering as bottom 3 d rendering engine; Meanwhile, adopt the further analog simulation of OsgOcean module to play up current and weather effect, obtain 3-dimensional digital lake terrain environment scene; Wherein, the current scene obtained by simulation and weather effect scene are controlled by human-computer interaction mechanism, carry out scene update; Concrete employing following methods carries out scene update:
S31, uses C++/CLI technical design GUI graphical interfaces;
S32, creates GUI thread respectively and OSG plays up thread;
Described GUI thread constantly detects the three-dimensional flow field displaying order whether receiving operator and sent by described GUI graphical interfaces, and upon this detection, the described three-dimensional flow field received is shown that order is sent in message queue by described GUI thread;
Described OSG plays up thread loops and reads message in message queue, when described OSG play up the thread three-dimensional flow field read in message queue show order time, triggers a flow field displaying call back function;
By described flow field, S33, shows that call back function carries out scene update.
Preferably, in S1, described 3-dimensional digital relief block builds by the following method: adopt Geographic Information System (GIS) software to import the dem data of target landform, obtain the initial configuration of target landform, again calibration, cutting and concatenation are performed further to it, generate satisfactory 3-dimensional digital relief block;
Described ground object model builds by the following method: adopt 3DS MAX or Photoshop to assist modeling software to build ground object model;
Described earth's surface derivant model builds by the following method: use SpeedTree software building earth's surface derivant model.
Preferably, S2 is specially: use Terra Vista software ground object model and earth's surface derivant model to be loaded on geographic position corresponding to described 3-dimensional digital relief block.
Preferably, S33 is specially:
Described flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading Hydrodynamic Model calculating, row relax of going forward side by side;
Described flow field shows that result is attached on the model of needs loading by call back function, emulates and loads water flow field, obtaining rendering result; Then upgrade former scene by this rendering result, and be presented on GUI graphical interfaces.
Preferably, S33 is specially:
Described flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading contaminative diffusion model calculating, by animation simulation Pollutants Diffusion process; And/or
Described flow field shows that call back function is according to the file name parameter transmitted, file is utilized to read the destination file of class reading water quality and quantity scheduling model calculating, dynamic drafting diversion route, dynamically, intuitively shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map by GUI graphical interfaces.
The present invention also provides a kind of digital lake 3-D Visualization Simulation platform based on OSG, by OsgOcean module, OSG module and GUI graphical interfaces adopt continuous integrating and loose coupling model-driven methodologies completion system integrated, specifically comprise: data Layer, model layer, rendering layer and presentation layer;
Wherein, described data Layer, for storing basic data, comprising: geographical spatial data, Hydrodynamic Model result of calculation, contaminative diffusion model result of calculation, water quality and quantity scheduling model result of calculation and model data;
Each class model that described model layer creates for storing various modeling software, model layer is the module reading data layer data and load, and comprises camera and roam module, three-dimensional model loading and administration module, file read module, Virtual City Model and three-dimensional large scale terrain;
Described rendering layer is the nucleus module of 3-D Visualization Simulation platform, carries out playing up of required model of place by OSG module;
Described presentation layer is used for the various rendering result obtained after rendering layer process to show.
Preferably, described presentation layer comprises Three-dimensional Terrain Visualization display module, the visual display module of three-dimensional waterbody, the visual display module of three-dimensional building, the visual display module of three-dimensional flow field, the visual display module of diversion route, the visual display module of contamination and sky sylphon and the visual display module of spontaneous phenomenon.
Beneficial effect of the present invention is as follows:
Digital lake three-dimensional visualization simulation method based on OSG provided by the invention and emulation platform, based on OSG, the digital lake three-dimensional visualization simulation method of OsgOcean, C++/CLI and continuous integrating loose coupling model-driven methodologies, there is easy to operate, to be easy to expansion, real-time high-efficiency advantage, the demand of wide-range terrain and massive spatial data 3-D Visualization Simulation can be met, achieve the needs of 3-dimensional digital lake real simulation.The fields such as Hydraulic and Hydro-Power Engineering, city planning, time burst emergency processing and virtual reality can be applied in.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the digital lake three-dimensional visualization simulation method based on OSG provided by the invention;
Fig. 2 is the schematic flow sheet of the two-wire journey communication mechanism of Effect-based operation queue provided by the invention;
Fig. 3 is a kind of concrete schematic flow sheet of the two-wire journey communication mechanism of Effect-based operation queue provided by the invention;
Fig. 4 is the structural representation of the digital lake 3-D Visualization Simulation platform based on OSG provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, the invention provides a kind of digital lake three-dimensional visualization simulation method based on OSG, comprise the following steps:
S1, builds the 3-dimensional digital relief block of region, lake; And, build ground object model and earth's surface derivant model;
Concrete, Geographic Information System (GIS) software such as ArcGIS can be adopted to import DEM (digital elevation model) data of target landform, obtain the initial configuration of target landform, then the operations such as calibration, cutting and splicing are performed further to it, generate satisfactory 3-dimensional digital relief block.
The auxiliary modeling software modeling that ground object model and earth's surface derivant model can adopt some known, such as: adopt the modeling softwares such as 3DS MAX, Photoshop to build ground object model, as: bridge, road etc.; Use SpeedTree software building general earth's surface derivant model, as: trees flowers and plants model etc.Wherein, SpeedTree is a special Three-dimension Tree modeling software
S2, is loaded into described ground object model and described earth's surface derivant model on the corresponding geographic position of described 3-dimensional digital relief block, obtains 3-dimensional digital landform and geographical environment scene;
Concrete, Terra Vista software can be used ground object model and earth's surface derivant model to be loaded on corresponding geographic position, also can to add some other auxiliary elements simultaneously, as: electric pole, flower bed etc.Wherein, Terra Vista is a terrain modeling software.
S3, in described 3-dimensional digital landform and geographical environment scene basis, uses OSG module to carry out scene rendering as bottom 3 d rendering engine; Meanwhile, adopt the further analog simulation of OsgOcean module to play up current and weather effect, obtain 3-dimensional digital lake terrain environment scene; Wherein, the current scene obtained by simulation and weather effect scene are controlled by human-computer interaction mechanism, carry out scene update.
For making the digital lake virtual emulation scene of generation more true to nature and natural, in the present invention, also need to play up scene effect, concrete, adopt OSG module, to meeting the digital lake water surface that landform requires and water body is played up, by adding the callback operation of multiple sky background and multiple change Water Environment In Lakes, realize the effect such as illumination, the halation on sea, the mist in seabed regulating the size of ripples, the reflection of the water surface and refraction, the bottom.By adding weather environment effects module, add the sense of reality of virtual reality.
Wherein, OSG module is as OO high-order render engine, except increasing income with except platform-neutral, OSG encapsulates OpenGL, and on this basis, establish an OO Development Framework, make developer can break away from numerous and diverse programming on bottom layer details, can rapidly and efficiently complete the structure of three-dimensional scenic and play up, be convenient to Develop Application System and management.Real-time, interactive can be realized, multiple LOD technology, dynamic cutting and rendering primitives can be adopted, support playing up and interactive operation of megarelief, mass data.Adopt OSG module as bottom 3 d rendering engine, and use OsgOcean module as current render engine.Wherein, OsgOcean is the expansion water body module of OSG, and feature to realize water field of big area emulation realistically, and it utilizes stress and strain model and Fast Fourier Transform (FFT) to reappear the structure of the water surface, and can regulate the size of water wave; The real situation of lakebed, the reflection of the water surface and refraction, water-bed illumination, the halation of lake surface, the fog effect etc. of lakebed is realized by Shader Programming with Pascal Language.Wherein, shader language is also referred to as shading language.
The two-wire journey communication mechanism of the Effect-based operation queue shown in Fig. 2, Fig. 3 specifically can be adopted to carry out scene update:
S31, using C++/CLI technical design GUI (Graphical User Interface) graphical interfaces, is the user-friendly operation interface of one;
S32, creates GUI thread respectively and OSG plays up thread; Make GUI and OSG operate on different threads, carry out communication by message queue between them, the operation of completion system and control, concrete:
Described GUI thread constantly detects the three-dimensional flow field displaying order whether receiving operator and sent by described GUI graphical interfaces, and upon this detection, the described three-dimensional flow field received is shown that order is sent in message queue by described GUI thread;
Described OSG plays up thread loops and reads message in message queue, when described OSG play up the thread three-dimensional flow field read in message queue show order time, triggers a flow field displaying call back function;
By described flow field, S33, shows that call back function carries out scene update.
In this step, specifically comprise following three kinds of situations:
(1) flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading Hydrodynamic Model calculating, row relax of going forward side by side;
Described flow field shows that result is attached on the model of needs loading by call back function, emulates and loads water flow field, obtaining rendering result; Then upgrade former scene by this rendering result, and be presented on GUI graphical interfaces.
(2) flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading contaminative diffusion model calculating, by animation simulation Pollutants Diffusion process;
(3) flow field shows that call back function is according to the file name parameter transmitted, file is utilized to read the destination file of class reading water quality and quantity scheduling model calculating, dynamic drafting diversion route, dynamically, intuitively shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map by GUI graphical interfaces.
Digital lake three-dimensional visualization simulation method provided by the invention, not only there is in traditional virtual reality system the multiple roaming function had, the function such as polyphaser controls, weather and environmental characteristics are arranged, and based on the result that hydrodynamics and calculation result, contaminative diffusion model result of calculation and water quality and quantity scheduling model calculate, achieve the animation broadcasting that the three-dimensional displaying in flow field humorously in lake, the emulation of Pollutants Diffusion and water quality and quantity dispatch diversion route.
The calculating of three-dimensional artificial to wide-range terrain and real-time rendering is very consuming time, need be equipped with high-performance computer, configuration requirement suggestion as follows: CPU: recommend dominant frequency 2.0GHz and more than, support GPU programme; Internal memory: recommend 4G and more than; Hard disk: recommend more than 250G; Video card: select the video card supporting that OSG plays up, recommends NViDIA Quadro series video card.
As shown in Figure 4, the present invention also provides a kind of digital lake 3-D Visualization Simulation platform based on OSG, adopt continuous integrating and loose coupling model-driven methodologies completion system integrated, specifically comprise: data Layer, model layer, rendering layer and presentation layer; Adopt continuous integrating and loose coupling model-driven methodologies completion system integrated, system is with good expansibility.
Wherein, described data Layer, for storing basic data, comprising: geographical spatial data, Hydrodynamic Model result of calculation, contaminative diffusion model result of calculation, water quality and quantity scheduling model result of calculation and model data;
Each class model that described model layer creates for storing various modeling software, model layer is the module reading data layer data and load, and comprises camera and roam module, three-dimensional model loading and administration module, file read module, Virtual City Model and three-dimensional large scale terrain; By the setting of self-defined camera and multiple Roam Path, operator can realize the roaming of three-dimensional scenic fast, easily;
Described rendering layer is the nucleus module of 3-D Visualization Simulation platform, carries out playing up of required model of place by OSG module;
Described presentation layer is used for the various rendering result obtained after rendering layer process to show.Presentation layer comprises Three-dimensional Terrain Visualization display module, the visual display module of three-dimensional waterbody, the visual display module of three-dimensional building, the visual display module of three-dimensional flow field, the visual display module of diversion route, the visual display module of contamination and sky sylphon and the visual display module of spontaneous phenomenon.
The present invention, in conjunction with the powerful three-dimensional rendering ability of OSG, achieves the three-dimensional artificial of digital lake by improving OsgOcean module.By adding more feature atural object three-dimensional model and house, the model such as trees, electric pole, construct the 3-dimensional digital lake simulated environment of a wide-range terrain, to realize the three-dimension virtual reality emulation of Lake Water network regulation degree, for decision maker provides visual effect directly perceived, true to nature, and for aid decision making.
Provided by the invention based on OSG, the digital lake three-dimensional visualization simulation method of OsgOcean, C++/CLI and continuous integrating loose coupling model-driven methodologies, there is easy to operate, to be easy to expansion, real-time high-efficiency advantage, the demand of wide-range terrain and massive spatial data 3-D Visualization Simulation can be met, achieve the needs of 3-dimensional digital lake real simulation.The fields such as Hydraulic and Hydro-Power Engineering, city planning, time burst emergency processing and virtual reality can be applied in.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (1)
1., based on a digital lake three-dimensional visualization simulation method of OSG, it is characterized in that, comprise the following steps:
S1, builds the 3-dimensional digital relief block of region, lake; And, build ground object model and earth's surface derivant model;
S2, is loaded into described ground object model and described earth's surface derivant model on the corresponding geographic position of described 3-dimensional digital relief block, obtains 3-dimensional digital landform and geographical environment scene;
S3, in described 3-dimensional digital landform and geographical environment scene basis, uses OSG module to carry out scene rendering as bottom 3 d rendering engine; Meanwhile, adopt the further analog simulation of OsgOcean module to play up current and weather effect, obtain 3-dimensional digital lake terrain environment scene; Concrete, OsgOcean module is as current render engine, and OsgOcean is the expansion water body module of OSG, realizes water field of big area emulation realistically, utilizes stress and strain model and Fast Fourier Transform (FFT) to reappear the structure of the water surface, and the size of adjustable water wave; The real situation of lakebed, the reflection of the water surface and refraction, water-bed illumination, the halation of lake surface, the fog effect of lakebed is realized by Shader Programming with Pascal Language;
Wherein, the current scene obtained by simulation and weather effect scene are controlled by human-computer interaction mechanism, carry out scene update; The two-wire journey communication mechanism of concrete employing Effect-based operation queue carries out scene update:
S31, uses C++/CLI technical design GUI graphical interfaces;
S32, creates GUI thread respectively and OSG plays up thread; Make GUI and OSG operate on different threads, carry out communication by message queue between them, the operation of completion system and control, concrete:
Described GUI thread constantly detects the three-dimensional flow field displaying order whether receiving operator and sent by described GUI graphical interfaces, and upon this detection, the described three-dimensional flow field received is shown that order is sent in message queue by described GUI thread;
Described OSG plays up thread loops and reads message in message queue, when described OSG play up the thread three-dimensional flow field read in message queue show order time, triggers a flow field displaying call back function;
By described flow field, S33, shows that call back function carries out scene update;
S33 is specially:
Described flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading Hydrodynamic Model calculating, row relax of going forward side by side;
Described flow field shows that result is attached on the model of needs loading by call back function, emulates and loads water flow field, obtaining rendering result; Then upgrade former scene by this rendering result, and be presented on GUI graphical interfaces;
Described flow field shows that call back function is according to the file name parameter transmitted, and utilizes file to read the destination file of class reading contaminative diffusion model calculating, by animation simulation Pollutants Diffusion process; And/or
Described flow field shows that call back function is according to the file name parameter transmitted, file is utilized to read the destination file of class reading water quality and quantity scheduling model calculating, dynamic drafting diversion route, dynamically, intuitively shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map by GUI graphical interfaces;
Wherein, in S1, described 3-dimensional digital relief block builds by the following method: adopt Geographic Information System (GIS) software to import the dem data of target landform, obtain the initial configuration of target landform, again calibration, cutting and concatenation are performed further to it, generate satisfactory 3-dimensional digital relief block;
Described ground object model builds by the following method: adopt 3DS MAX or Photoshop to assist modeling software to build ground object model;
Described earth's surface derivant model builds by the following method: use SpeedTree software building earth's surface derivant model;
Wherein, S2 is specially: use Terra Vista software ground object model and earth's surface derivant model to be loaded on geographic position corresponding to described 3-dimensional digital relief block.
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| CN110992469B (en) * | 2019-11-29 | 2024-01-23 | 四川航天神坤科技有限公司 | Visualization method and system for massive three-dimensional model data |
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| CN102243770B (en) * | 2011-07-19 | 2013-02-20 | 南昌航空大学 | Method for quickly drawing realistic rendering of naval battlefield based on OSG |
| CN102651180B (en) * | 2012-04-09 | 2015-05-20 | 上海交通大学 | OSG-based (open scene graph-based) electric-electronic virtual experiment simulation system |
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