CN103559739A - 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 virtual reality technology field, be specifically related to a kind of digital lake three-dimensional visualization simulation method and emulation platform based on OSG.
Background technology
Digital lake is an important area level of digital earth, at aspects such as flood control and disaster reduction, sustainable development, energy utilization, has 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 exchange being crossed to three-dimensional visualization means displays, thereby the 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 POLLUTION SIMULATION, real time data interface.Therefore planning and the task of preventing and reducing natural disasters that, digital lake three-dimensional simulation technique is lake provide decision support more intuitively.
But, in existing digital lake 3-D Visualization Simulation process, mainly adopt traditional 3 d rendering engine 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 the optimizations such as LOD (Level of detail), dynamic tailor to play up function; 4. low to wide-range terrain and lake rendering efficiency.
Summary of the invention
The defect existing for prior art, the invention provides a kind of digital lake three-dimensional visualization simulation method and emulation platform based on OSG, has advantages of 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, the 3-dimensional digital relief block of structure 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, on described 3-dimensional digital landform and geographical environment scene basis, is used 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 obtaining by simulation and weather effect scene, by man-machine interaction mechanism control, are carried out scene update; The concrete following methods that adopts carries out scene update:
S31, is used C++/CLI technical design GUI graphical interfaces;
S32, creates respectively GUI thread and OSG and plays up thread;
Whether the continuous detection of described GUI thread receives the three-dimensional flow field displaying order that operator sends by described GUI graphical interfaces, and when detecting, described GUI thread shows that by the described three-dimensional flow field receiving order sends in message queue;
Described OSG plays up thread circulation and reads the message in message queue, when described OSG plays up thread and reads three-dimensional flow field in message queue and show order, triggers a flow field and shows call back function;
S33, shows that by described flow field 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 it is further carried out to calibration, cutting and concatenation, generate satisfactory 3-dimensional digital relief block;
Described ground object model builds by the following method: adopt the auxiliary modeling software of 3DS MAX or Photoshop 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 that ground object model and earth's surface derivant model are loaded on the geographic position that described 3-dimensional digital relief block is corresponding.
Preferably, S33 is specially:
Described flow field shows that call back function is according to the file name parameter of transmitting, and utilizes file to read class and reads the destination file that Hydrodynamic Model is calculated, and process;
Described flow field shows that call back function appends to result on the model that needs to load, and emulation also loads water flow field, obtains rendering result; Then by this rendering result, upgrade former scene, 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 of transmitting, and utilizes file to read class and reads the destination file that contaminative diffusion model calculates, by animation simulation Pollutants Diffusion process; And/or
Described flow field shows that call back function is according to the file name parameter of transmitting, utilize file to read class and read the destination file that water quality and quantity scheduling model calculates, dynamic drafting diversion route, shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map dynamically, intuitively by GUI graphical interfaces.
The present invention also provides a kind of digital lake 3-D Visualization Simulation platform based on OSG, OsgOcean module, OSG module and GUI graphical interfaces are adopted and continue integrated and loose coupling model-driven technology completion system is integrated, specifically comprise: data Layer, model layer, rendering layer and presentation layer;
Wherein, described data Layer is used 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;
Described model layer is for storing each class model that various modeling softwares create, model layer is the module that data layer data is read and loaded, 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, by OSG module, carries out playing up of required model of place;
Described presentation layer shows for the various rendering result that obtain after rendering layer is processed.
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 day 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 and emulation platform based on OSG provided by the invention, based on OSG, the digital lake three-dimensional visualization simulation method of OsgOcean, C++/CLI and lasting integrated loose coupling model-driven technology, have advantages of easy to operate, be easy to expansion, real-time high-efficiency, can meet the demand of wide-range terrain and massive spatial data 3-D Visualization Simulation, realize the needs of 3-dimensional digital lake real simulation.Can be applied in the fields such as Hydraulic and Hydro-Power Engineering, city planning, the emergency processing of burst time and virtual reality.
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 based on message queue provided by the invention;
Fig. 3 is a kind of concrete schematic flow sheet of the two-wire journey communication mechanism based on message 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, the 3-dimensional digital relief block of structure region, lake; And, build ground object model and earth's surface derivant model;
Concrete, can adopt Geographic Information System (GIS) software as DEM (digital elevation model) data of ArcGIS importing target landform, obtain the initial configuration of target landform, then it is further carried out to the operations such as calibration, cutting and splicing, generate satisfactory 3-dimensional digital relief block.
Ground object model and earth's surface derivant model can adopt some known auxiliary modeling software modelings, such as: adopt the modeling softwares such as 3DS MAX, Photoshop to build ground object model, as: bridge, road etc.; Use the general earth's surface of SpeedTree software building 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, can use Terra Vista software that ground object model and earth's surface derivant model are loaded on corresponding geographic position, also can add some other auxiliary elements simultaneously, as: electric pole, flower bed etc.Wherein, Terra Vista is a terrain modeling software.
S3, on described 3-dimensional digital landform and geographical environment scene basis, is used 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 obtaining by simulation and weather effect scene, by man-machine interaction mechanism control, are carried 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 scene effect to play up, concrete, adopt OSG module, to meeting the digital lake water surface and the water body of landform requirement, play up, by adding the callback operation of multiple sky background and multiple change Water Environment In Lakes, realize and regulate the size of ripples, illumination, the halation on sea, the mist texts in seabed at the reflection of the water surface and refraction, the bottom.By adding weather environment effects module, increased the sense of reality of virtual reality.
Wherein, OSG module is as OO high-order render engine, except increase income and platform-neutral, OSG encapsulates OpenGL, and on this basis, set up 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 exploitation and the management of application program.Can realize real-time, interactive, can adopt multiple LOD technology, can dynamic tailor and rendering primitives, 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 is to realize realistically water field of big area emulation, and it utilizes grid to divide and Fast Fourier Transform (FFT) reappears the structure of the water surface, and can regulate the size of water wave; By Shader Programming with Pascal Language, realize the real situation of lakebed, illumination, the halation of lake surface, the fog effect of lakebed etc. at the reflection of the water surface and refraction, the bottom.Wherein, shader language is also referred to as shading language.
Specifically can adopt the two-wire journey communication mechanism based on message queue shown in Fig. 2, Fig. 3 to carry out scene update:
S31, is used C++/CLI technical design GUI (Graphical User Interface) graphical interfaces, is a kind of user-friendly operation interface;
S32, creates respectively GUI thread and OSG and plays up thread; GUI and OSG are operated on different threads, between them, by message queue, carry out communication, the operation of completion system and control, concrete:
Whether the continuous detection of described GUI thread receives the three-dimensional flow field displaying order that operator sends by described GUI graphical interfaces, and when detecting, described GUI thread shows that by the described three-dimensional flow field receiving order sends in message queue;
Described OSG plays up thread circulation and reads the message in message queue, when described OSG plays up thread and reads three-dimensional flow field in message queue and show order, triggers a flow field and shows call back function;
S33, shows that by described flow field 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 of transmitting, and utilizes file to read class and reads the destination file that Hydrodynamic Model is calculated, and process;
Described flow field shows that call back function appends to result on the model that needs to load, and emulation also loads water flow field, obtains rendering result; Then by this rendering result, upgrade former scene, and be presented on GUI graphical interfaces.
(2) flow field shows that call back function is according to the file name parameter of transmitting, and utilizes file to read class and reads the destination file that contaminative diffusion model calculates, by animation simulation Pollutants Diffusion process;
(3) flow field shows that call back function is according to the file name parameter of transmitting, utilize file to read class and read the destination file that water quality and quantity scheduling model calculates, dynamic drafting diversion route, shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map dynamically, intuitively by GUI graphical interfaces.
Digital lake three-dimensional visualization simulation method provided by the invention, not only there is the functions such as the multiple roaming function, polyphaser control, weather and the environmental characteristics that have in traditional virtual reality system arrange, and the result based on hydrodynamics and calculation result, contaminative diffusion model result of calculation and water quality and quantity scheduling model calculate, realized lake three-dimensional humorously the displaying in flow field, the animation of the emulation of Pollutants Diffusion and water quality and quantity scheduling diversion route play.
Three-dimensional artificial is very consuming time to the calculating of wide-range terrain and real-time rendering, need to be equipped with high-performance computer, and configuration requirement suggestion is as follows: CPU: recommend dominant frequency 2.0GHz and more than, support GPU to programme; Internal memory: recommend 4G and more than; Hard disk: more than recommending 250G; Video card: the video card of selecting support OSG to play up, recommend 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, and employing continues integrated and loose coupling model-driven technology completion system is integrated, specifically comprises: data Layer, model layer, rendering layer and presentation layer; Employing continues integrated and loose coupling model-driven technology completion system is integrated, and system is with good expansibility.
Wherein, described data Layer is used 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;
Described model layer is for storing each class model that various modeling softwares create, model layer is the module that data layer data is read and loaded, 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, by OSG module, carries out playing up of required model of place;
Described presentation layer shows for the various rendering result that obtain after rendering layer is processed.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 day sylphon and the visual display module of spontaneous phenomenon.
The present invention, in conjunction with the powerful three-dimensional rendering ability of OSG, has realized 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, built 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 lasting integrated loose coupling model-driven technology, have advantages of easy to operate, be easy to expansion, real-time high-efficiency, can meet the demand of wide-range terrain and massive spatial data 3-D Visualization Simulation, realize the needs of 3-dimensional digital lake real simulation.Can be applied in the fields such as Hydraulic and Hydro-Power Engineering, city planning, the emergency processing of burst time and virtual reality.
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 be looked protection scope of the present invention.
Claims (7)
1. the digital lake three-dimensional visualization simulation method based on OSG, is characterized in that, comprises the following steps:
S1, the 3-dimensional digital relief block of structure 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, on described 3-dimensional digital landform and geographical environment scene basis, is used 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 obtaining by simulation and weather effect scene, by man-machine interaction mechanism control, are carried out scene update; The concrete following methods that adopts carries out scene update:
S31, is used C++/CLI technical design GUI graphical interfaces;
S32, creates respectively GUI thread and OSG and plays up thread;
Whether the continuous detection of described GUI thread receives the three-dimensional flow field displaying order that operator sends by described GUI graphical interfaces, and when detecting, described GUI thread shows that by the described three-dimensional flow field receiving order sends in message queue;
Described OSG plays up thread circulation and reads the message in message queue, when described OSG plays up thread and reads three-dimensional flow field in message queue and show order, triggers a flow field and shows call back function;
S33, shows that by described flow field call back function carries out scene update.
2. the digital lake three-dimensional visualization simulation method based on OSG according to claim 1, it is characterized in that, 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 it is further carried out to calibration, cutting and concatenation, generate satisfactory 3-dimensional digital relief block;
Described ground object model builds by the following method: adopt the auxiliary modeling software of 3DS MAX or Photoshop 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.
3. the digital lake three-dimensional visualization simulation method based on OSG according to claim 1, it is characterized in that, S2 is specially: use Terra Vista software that ground object model and earth's surface derivant model are loaded on the geographic position that described 3-dimensional digital relief block is corresponding.
4. the digital lake three-dimensional visualization simulation method based on OSG according to claim 1, is characterized in that, S33 is specially:
Described flow field shows that call back function is according to the file name parameter of transmitting, and utilizes file to read class and reads the destination file that Hydrodynamic Model is calculated, and process;
Described flow field shows that call back function appends to result on the model that needs to load, and emulation also loads water flow field, obtains rendering result; Then by this rendering result, upgrade former scene, and be presented on GUI graphical interfaces.
5. the digital lake three-dimensional visualization simulation method based on OSG according to claim 4, is characterized in that, S33 is specially:
Described flow field shows that call back function is according to the file name parameter of transmitting, and utilizes file to read class and reads the destination file that contaminative diffusion model calculates, by animation simulation Pollutants Diffusion process; And/or
Described flow field shows that call back function is according to the file name parameter of transmitting, utilize file to read class and read the destination file that water quality and quantity scheduling model calculates, dynamic drafting diversion route, shows lake systemic circulation, middle circulation and partial circulating diversion water transfer route map dynamically, intuitively by GUI graphical interfaces.
6. the digital lake 3-D Visualization Simulation platform based on OSG, it is characterized in that, OsgOcean module, OSG module and GUI graphical interfaces are adopted and continue integrated and loose coupling model-driven technology completion system is integrated, specifically comprise: data Layer, model layer, rendering layer and presentation layer;
Wherein, described data Layer is used 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;
Described model layer is for storing each class model that various modeling softwares create, model layer is the module that data layer data is read and loaded, 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, by OSG module, carries out playing up of required model of place;
Described presentation layer shows for the various rendering result that obtain after rendering layer is processed.
7. the digital lake 3-D Visualization Simulation platform based on OSG according to claim 6, it is characterized in that, 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 day sylphon and the visual display module of spontaneous phenomenon.
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