CN106709994A - Construction method of forest fire three-dimensional visual scene orienting aviation fire-fighting training - Google Patents
Construction method of forest fire three-dimensional visual scene orienting aviation fire-fighting training Download PDFInfo
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- CN106709994A CN106709994A CN201710053537.8A CN201710053537A CN106709994A CN 106709994 A CN106709994 A CN 106709994A CN 201710053537 A CN201710053537 A CN 201710053537A CN 106709994 A CN106709994 A CN 106709994A
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Abstract
The invention discloses a construction method of a forest fire three-dimensional visual scene orienting aviation fire-fighting training, and relates to the field of aviation fire-fighting/computer simulation. Compared with the existing related methods, the highly vivid effect of ground forest and flame and other details can be guaranteed on the basis of constructing a wide-range three-dimensional terrain environment, and a visual scene system meeting the requirements is provided for a helicopter forest fire extinguishing training system through a relatively simple method. The effect is realized by the method of dividing the core task area and the non-core task area of the terrain, replacing the conventional particle system by using a random particle system and using a dynamic model and surface texture replacement which are relatively simple and can guarantee the effect. Compared with the existing similar systems, the contradiction between large terrain, high fidelity and high operation smoothness can be solved. In the actual application, the method is suitable for visual simulation of the helicopter forest fire extinguishing task and can also be popularized to other similar simulation systems.
Description
Technical field
The present invention relates to aviation fire-fighting/Computer Simulation field, China's aviation Lash-up succor system construction is applied to, especially
It is related to a kind of construction method of the forest fire three-dimensional vision of Aviation fire drill.
Background technology
Helicopter forest extinguishing is the big activity of a dangerous high, technical difficulty, but, due to its extinguishing effect preferably
Therefore the attention of national governments has been obtained.The close fit of the whole helicopter crew of helicopter forest extinguishing action need and
Skilled operation, needs to carry out necessary training usually.But, this mass disaster scene similar to forest fire is difficult to
Reappeared usually, and aircraft operating cost is very high, therefore in terms of the training of complex task, typically adopt in the industry
It is trained with Virtual Simulation.
, at ten meters between hundreds of meters scope, scope of activities is in number for the flying height of the helicopter of execution forest extinguishing task
Kilometer in order to ensure the sense of reality of simulation process, not only needs to build large-scale mountain region model to dozens of kilometres or so,
And need to build fine, dynamic tree modelling and flame and smoke model in fire extinguishing procedure.Additionally, in order to emulate
The display effect of picture is with fluency, it is necessary under certain hardware limitation, it is ensured that model accuracy and the sense of reality, while as far as possible
Reduce the occupancy of computer resource.
Prior art multiplex VegaPrime when realizing that megarelief is modeled is carried out.Vega Prime are a being applied to
The professional simulation software of flight simulation, can build super large-scale ground model.In this kind of flight simulation visual system, fly
Row device flying height is (more than thousands of rice) higher, relatively low to the landform required precision in addition near airports ground, therefore
Ground model details is more coarse；In addition, the emulation for being also not easy to carry out real terrain environment using VegaPrime is built, because
It is relatively low, higher to landform precision, ground vegetation and scene of a fire detail that this is not suitable for helicopter this flying height of fire extinguishing
Artificial tasks.
When carrying out extensive forest modeling, due to the enormous amount of trees, simplified tree modelling is typically considered as.Mesh
Before, BillBoard technologies are a kind of conventional tree modelling simplification technologies, and its principle is replaced using the trees textures of two dimension
Three-dimensional tree modelling, when observation visual angle changes, BillBoard models can be revolved automatically about the direction of its vertical axes
Turn, so that it faces observer forever.Although this technology greatly simplifies tree modelling, but when high-altitude is observed
Model can show linear, lose the sense of reality, therefore be not suitable for being used in the forest vision simulation system towards helicopter fire extinguishing
In system.
For flame and the dynamic model of smog, way general at present is emulated using particIe system.Particle systems
The principle of system is, by an emission source, a large amount of grains with attributes such as speed, direction and life-spans persistently to be launched to space
Son, flame, smog and other effects are simulated by the treatment such as rendering.Shortcoming using particIe system is that substantial amounts of particle can be consumed
Many internal memories and computing resource, reduce the refreshing frame per second of analogue system.In addition, Approach of Particle System conventional at present cannot be simulated
Dying fire phenomenon common in forest fire.In helicopter forest extinguishing task, it is also necessary to put out immediately, otherwise can still ignite week
Enclose forest.
The content of the invention
It is an object of the invention to provide a kind of construction method of the forest fire three-dimensional vision of Aviation fire drill,
So as to solve foregoing problems present in prior art.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of construction method of the forest fire three-dimensional vision of Aviation fire drill, comprises the following steps：
S1, obtains the latitude and longitude information and height distribution map of core simulating area, builds digital complex demodulation；Obtain
Take the high-resolution satellite figure in the range of the longitude and latitude, and map that to DEM, build helicopter fire extinguishing core activity region
Digital geographic model DTM；
S2, obtains the latitude and longitude information and satellite mapping of non-core simulating area, according to the elevation information of its landform, manual structure
The DTM in non-core region is built, and complete emulation dimensional topography on a large scale is made together with core simulating area；
S3, builds the tree modelling after unburned tree modelling and burning；Core simulating area is carried out into mesh generation,
Unburned tree modelling is planted in grid, according to satellite photo information so that tree modelling is covered according to vegetation density
Wood land；
S4, using random particles system constructing flame model and smoke model；
S5, sets initial flame model and smoke model, according to the Mathematical Modeling of propagation of flame, using cellular in point of origin
Automatic machine principle calculates the time of forest cellular around flame ignition, drives flame to be spread between forest cellular, and adopt
The method replaced with model and terrain texture, the dynamically woodland scenery during simulated combustion.
Preferably, S1 comprises the following steps：
S101, the geographical elevation gray-scale map of core simulating area is obtained using open Online Map database；
S102, the gray-scale map is imported in virtual reality engine Unity 3D, is generated using its Terrain landform component
DEM, and the size of the landform of generation is proportionally set；
S103, the high definition satellite image data in the range of target longitude and latitude are downloaded by geographical spatial data website, and will
It is imported among Unity 3D, adjusts the correspondence position of the satellite photo and the landform of S102 generations, is set to the earth's surface of landform
Texture, completes the making of the DTM of fire extinguishing core space.
Preferably, S102 specifically includes following steps：
S1021, under a proportional relationship, is carried out using the altitude information of the nucleus central point included in the gray-scale map
Height correction；
S1022, under a proportional relationship, adjustment generates the size dimension of landform in Unity 3D；
S1023, continuous mapping relations are generated using linear interpolation method, generate real landform threedimensional model.
Preferably, S2 comprises the following steps：
S201, according to the space scale and ratio of target area, flat ground is set up in the core simulating area periphery
Shape；
S202, using with identical method in step S103, download corresponding region low accuracy satel-lite image data, set
It is the satellite imagery of landform；
S203, according to real geographical terrain information, with reference to satellite mapping, has by the landform dataller of Unity 3D, draws
Go out hypsography change；
, be smoothly connected for core space landform and non-core heart district landform using the instrument of Unity 3D by S204, is completed whole
The making of individual landform DTM.
Preferably, S3 comprises the following steps：
S301, using the more simplified Three-dimension Tree model in Unity 3D, adjusts its material and textures, builds two kinds
Tree modelling：Tree modelling that is unburned tree modelling and having burnt；
S302, square net division is carried out by fire extinguishing core space landform；
S303, according to local forest density, implantation number unburned tree modelling, complete in the corresponding earth's surface of each grid
Into building for woodland scenery.
Preferably, S302 will put out a fire specifically, be a basic cellular unit according to 10 meters * 10 meters of spatial dimension
Core space landform carries out mesh generation.
Preferably, S4 comprises the following steps：
S401, sets a naked light probability of happening；
S402, a random number between 0 and 1 is produced using random function, if the random number is less than the naked light
Probability of happening, then generate a particIe system in current cellular；
S403, in Unity 3D, flame model or smoke model is set to by the particIe system, completes flame model
Or the structure of smoke model.
Preferably, S5 comprises the following steps：
S501, according to emulation actual conditions, chooses a cellular in scale Forest Scene as point of origin, by flame model and
Smoke model is placed in the middle of point of origin tree modelling；
S502, sets global wind direction and wind speed, is calculated using flame evolutionary model and currently catches fire cellular to 8 adjacent units
The propagation factor of born of the same parents；
S503, live wire is considered as by the outermost layer cellular of current fire area, is found all adjacent with live wire unburned
Cellular, calculates all of flame propagation factor sum of the cellular to the cellular of catching fire around it, if the result exceed setting
Fiery threshold value, then the cellular become the state of catching fire, flame and smoke model are placed among the cellular；
S504, is the maximum time of each cellular setting sustained combustion, after combustion process exceedes the time, cellular transformation
It is after-flame state, when cellular reaches after-flame state, the tree modelling burnt in the cellular is replaced with into spent tree modelling；
The satellite imagery of the cellular is substituted for the texture under after-flame state simultaneously；Flame and smoke model are finally removed, while should
Cellular is set to zero to the flame propagation factor of cellular around.
The beneficial effects of the invention are as follows：A kind of forest towards helicopter forest extinguishing task provided in an embodiment of the present invention
The construction method of fire three-dimensional vision, compared to existing correlation technique, is constructing the base of large-scale three-dimensional terrain environment
It is helicopter forest extinguishing in relatively simple method on plinth, it is ensured that the high fidelity effect of the details such as ground forest, flame
Training system provides the visual system for meeting and requiring.This effect is the core missions area and non-core by dividing landform
Business area, using random particles system instead of traditional particIe system, using relatively simple but ensure that the dynamic model of effect
The method such as replace with satellite imagery to realize.Compared to existing similar system, megarelief, high fidelity and Gao Yun are solved
Contradiction between row fluency.In actual applications, the method be applicable not only to helicopter forest extinguishing task visualization imitate
Very, while can also be generalized in other similar analogue systems.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the inventive method；
Fig. 2 is the forest combustion analogous diagram made using the inventive method.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.It should be appreciated that specific embodiment described herein is only used to explain the present invention, it is not used to
Limit the present invention.
The purpose of the present invention is to build one piece of virtual forest with real terrain as foundation, set up the flame of forest fire with
The dynamic simulation of smog, for helicopter hot drill task provides the visual system that a set of fidelity is higher, resource occupation is relatively low.
As shown in figure 1, to achieve these goals, the embodiment of the invention provides a kind of the gloomy of Aviation fire drill
The construction method of forest fires calamity three-dimensional vision, comprises the following steps：
S1, obtains the latitude and longitude information and height distribution map of core simulating area, builds digital complex demodulation；Obtain
Take the high-resolution satellite figure in the range of the longitude and latitude, and map that to DEM, build helicopter fire extinguishing core activity region
Digital geographic model DTM；
S2, obtains the latitude and longitude information and satellite mapping of non-core simulating area, according to the elevation information of its landform, manual structure
The DTM in non-core region is built, and complete emulation dimensional topography on a large scale is made together with core simulating area；
S3, builds the tree modelling after unburned tree modelling and burning；Core simulating area is carried out into mesh generation,
Unburned tree modelling is planted in grid, according to satellite photo information so that tree modelling is covered according to vegetation density
Wood land；
S4, using random particles system constructing flame model and smoke model；
S5, sets initial flame model and smoke model, according to the Mathematical Modeling of propagation of flame, using cellular in point of origin
Automatic machine principle calculates the time of forest cellular around flame ignition, drives flame to be spread between forest cellular, and adopt
The method replaced with model and terrain texture, the dynamically woodland scenery during simulated combustion.
Specifically, S1 may include steps of：
S101, the geographical elevation gray-scale map of core simulating area is obtained using open Online Map database；
S102, the gray-scale map is imported in virtual reality engine Unity 3D, is generated using its Terrain landform component
DEM, and the size of the landform of generation is proportionally set；
S103, the high definition satellite image data in the range of target longitude and latitude are downloaded by geographical spatial data website, and will
It is imported among Unity 3D, adjusts the correspondence position of the satellite photo and the landform of S102 generations, is set to the earth's surface of landform
Texture, completes the making of the DTM of fire extinguishing core space.
Specifically, S102 may include steps of：
S1021, under a proportional relationship, is carried out using the altitude information of the nucleus central point included in the gray-scale map
Height correction；
S1022, under a proportional relationship, adjustment generates the size dimension of landform in Unity 3D；
S1023, continuous mapping relations are generated using linear interpolation method, generate real landform threedimensional model.
Specifically, S2 may include steps of：
S201, according to the space scale and ratio of target area, flat ground is set up in the core simulating area periphery
Shape；
S202, using with identical method in step S103, download corresponding region low accuracy satel-lite image data, set
It is the satellite imagery of landform；
S203, according to real geographical terrain information, with reference to satellite mapping, has by the landform dataller of Unity 3D, draws
Go out hypsography change；
, be smoothly connected for core space landform and non-core heart district landform using the instrument of Unity 3D by S204, is completed whole
The making of individual landform DTM.
Specifically, S3 may include steps of：
S301, using the more simplified Three-dimension Tree model in Unity 3D, adjusts its material and textures, builds two kinds
Tree modelling：Tree modelling that is unburned tree modelling and having burnt；
S302, square net division is carried out by fire extinguishing core space landform；
S303, according to local forest density, implantation number unburned tree modelling, complete in the corresponding earth's surface of each grid
Into building for woodland scenery.
Wherein, S302 is specifically as follows, and is a basic cellular unit according to 10 meters * 10 meters of spatial dimension, will go out
Fiery core space landform carries out mesh generation.
Specifically, S4 may include steps of：
S401, sets a naked light probability of happening；
S402, a random number between 0 and 1 is produced using random function, if the random number is less than the naked light
Probability of happening, then generate a particIe system in current cellular；
S403, in Unity 3D, flame model or smoke model is set to by the particIe system, completes flame model
Or the structure of smoke model.
Specifically, S5 may include steps of：
S501, according to emulation actual conditions, chooses a cellular in scale Forest Scene as point of origin, by flame model and
Smoke model is placed in the middle of point of origin tree modelling；
S502, sets global wind direction and wind speed, is calculated using flame evolutionary model and currently catches fire cellular to 8 adjacent units
The propagation factor of born of the same parents；
S503, live wire is considered as by the outermost layer cellular of current fire area, is found all adjacent with live wire unburned
Cellular, calculates all of flame propagation factor sum of the cellular to the cellular of catching fire around it, if the result exceed setting
Fiery threshold value, then the cellular become the state of catching fire, flame and smoke model are placed among the cellular；
S504, is the maximum time of each cellular setting sustained combustion, after combustion process exceedes the time, cellular transformation
It is after-flame state, when cellular reaches after-flame state, the tree modelling burnt in the cellular is replaced with into spent tree modelling；
The satellite imagery of the cellular is substituted for the texture under after-flame state simultaneously；Flame and smoke model are finally removed, while should
Cellular is set to zero to the flame propagation factor of cellular around.
Specific embodiment：
A kind of construction method of the forest fire three-dimensional vision of Aviation fire drill is the embodiment of the invention provides, is adopted
Implemented with following steps：
Step 1：The latitude and longitude information in core simulation objectives region is obtained, the height distribution map in the region is obtained, built
DEM；The high-resolution satellite figure in the range of the longitude and latitude is obtained, is mapped that in DEM, build helicopter fire extinguishing core activity
The DTM in region；
Step 2：The latitude and longitude information and satellite photo of non-core simulating area are obtained, according to the elevation information of its landform,
The DTM in the non-core region of manual construction, makes complete emulation dimensional topography on a large scale together with core simulating area；
Step 3：Build the tree modelling after unburned tree modelling and burning；Core simulating area is carried out into grid to draw
Point, unburned tree modelling is planted in grid, according to satellite photo information so that tree modelling is covered according to vegetation density
Lid wood land；
Step 4：Using random particles system constructing flame and smoke model；
Step 5：Initial flame and smoke model are set in point of origin, according to propagation of flame model, using cellular automata
Principle calculates flaming combustion time, drives flame to be spread between forest cellular, and the side replaced using model and textures
Method, the dynamically woodland scenery during simulated combustion.
In above-mentioned steps 1 and step 2, structure core space specifically includes following steps with non-core heart district DTM's：
Step 1.1：The latitude and longitude information in core simulation objectives region is obtained, specially 40 ° 55 ' 16.55 of north latitude is " to 41 °
03 ' 18.9 " between, between 115 ° 14 ' 18.7 of east longitude " to 115 ° 24 ' 56.1 ", 14.95 kilometers of the length of side, 223.5 squares of public affairs of area
In, 1524 meters of central point height above sea level.The height distribution map in the region is obtained, map must be answered using open Online Map database
The geographical elevation gray-scale map of target area is obtained, form is .raw, and resolution ratio is 128*128, each pixel correspondence actual range
116.8 meters.
Step 1.2：The gray-scale map is imported in virtual reality engine Unity 3D, the ash is read using Terrain components
Degree figure, sets length information, generates dimensional topography.Height correction is highly carried out using central point, ash is set in Unity 3D
The Discrete Mapping relation of degree and height；Linear interpolation method is recycled to generate continuous mapping relations.After accomplishing the setting up generate true
Real landform threedimensional model.
Step 1.3：The high definition satellite image data in the range of above-mentioned longitude and latitude are downloaded by the way that map developing instrument must be answered.Point
Resolution is 2048*2048, and 7.3 meters of actual range is represented per pixel.Be conducted among Unity 3D, adjust the satellite photo with
The correspondence position of landform, is set to the texturing of landform, completes the making of the DTM of fire extinguishing core space.
Step 1.4：According to the space scale and ratio of target area, flat landform is set up in core space periphery.Typically
For, in the case of air quality is preferable, atmospheric visibility is in 20 kms, therefore the present embodiment is outside core missions area
Enclose the level terrain for setting up that the length of side is 40 kilometers；
Step 2.1：Using map developing instrument must be answered to download the satellite mapping in the region, non-core landform is set to
Texturing；According to the textures information, by instruments such as the landform brushes of Unity 3D, hypsography change is generally drawn out
Change.
Step 2.2：The instruments such as the landform brush using Unity 3D carry out core space landform and non-core heart district landform smooth
Connection.
In the step 3, the modeling of tree resources and building for woodland scenery are carried out.Specifically enter according to following steps
OK：
Step 3.1：Using the more simplified Three-dimension Tree model in Unity 3D, its material and textures are adjusted, built
Two kinds of tree modellings：Tree modelling that is unburned tree modelling and having burnt.
Step 3.2：It is that a basic cellular unit enters according to 10 meters * 10 meters of spatial dimension by fire extinguishing core space landform
Row mesh generation.1495*1495 cellular grid is divided altogether.Each grid element intracellular, according to local forest density (satellite mapping G
The depth of passage) implantation number unburned tree modelling, complete building for woodland scenery.
In described step 4, flame and smoke model are generated using random particles system.In order to more preferable simulation is true
The generation of flame and smog, fly away with the randomness for disappearing, and reduce number of particles, the present invention proposes one based on random grain
The method of subsystem.The method sets a naked light probability of happening first, such as have in the forest cellular that 0.6 expression is being burnt
60% appearance naked light, 40% cellular is dying fire.The method is random between 0 and 1 using random function generation one
Number, a particIe system is generated if the random number is less than naked light probability of happening in current cellular.
Detailed implementation method is：
Step 4.1：A particIe system is created in Unity 3D, flame model is set to, is one control pin of its addition
This, is that it sets naked light probability of happening equal to 0.5 according to the random device described in detail in above-mentioned steps.
Step 4.2：A particIe system is created in Unity 3D, smoke model is set to, is one control pin of its addition
This, is that its setting smog probability of happening is 0.9 according to the random device described in detail in above-mentioned steps.
Above-mentioned steps 5 are to carry out the dynamic evolution emulation of forest fire.Detailed step of realizing is：
Step 5.1：According to emulation actual conditions, a cellular in scale Forest Scene is chosen as point of origin.By flame mould
Type and smoke model are placed in the middle of point of origin tree modelling.
Step 5.2：It is that wind direction is south wind, wind speed 1m/s, using based on Rothermel flames to set global wind direction and wind speed
Spread Model and the forest fires evolutionary model of simplification currently catches fire cellular to 8 adjacent propagation factors of cellular to calculate.
Step 5.3：The outermost layer cellular of current fire area is considered as live wire.All cellulars adjacent with live wire are found,
All of flame propagation factor sum of the cellular to the cellular of catching fire around it is calculated, if the result exceedes the threshold that catches fire of setting
Value, then the cellular becomes the state of catching fire, and flame and smoke model are placed among the cellular.
Step 5.4：The burning time for setting each tree wood is 10 minutes.For each cellular set sustained combustion it is maximum when
Between, after combustion process exceedes the time, the cellular is changed into after-flame state.When cellular reaches after-flame state, to this yuan of intracellular
Tree modelling is directly replaced, and will be that the tree modelling of burning replaces with spent tree modelling；Simultaneously by the cellular
Ground Face Map be substituted for meadow textures under after-flame state；Flame and smoke model are finally removed, while by the cellular to week
The flame propagation factor for enclosing cellular is set to zero.
By using above-mentioned technical proposal disclosed by the invention, following beneficial effect has been obtained：The embodiment of the present invention is carried
A kind of construction method of the forest fire three-dimensional vision towards helicopter forest extinguishing task for supplying, compared to existing correlation
Method, on the basis of large-scale three-dimensional terrain environment is constructed, it is ensured that the high fidelity of the details such as ground forest, flame
Effect, provides as helicopter forest extinguishing training system in relatively simple method and meets desired visual system.This effect
Fruit is by dividing the core missions area and non-core mission area of landform, replacing traditional particle systems using random particles system
System, using relatively simple but ensure that the dynamic model and satellite imagery of effect the method such as replace to realize.Compared to
Some similar systems, solve the contradiction between megarelief, high fidelity and operation fluency high.In actual applications, the party
Method is applicable not only to the visual simulating of helicopter forest extinguishing task, while other similar analogue systems can also be generalized to
In.
Each embodiment in this specification is described by the way of progressive, what each embodiment was stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.
Those skilled in the art should be understood that the sequential of the method and step that above-described embodiment is provided can be entered according to actual conditions
Row accommodation, is concurrently carried out also dependent on actual conditions.
All or part of step in the method that above-described embodiment is related to can be instructed by program correlation hardware come
Complete, described program can be stored in the storage medium that computer equipment can read, for performing the various embodiments described above side
All or part of step described in method.The computer equipment, for example：Personal computer, server, the network equipment, intelligent sliding
Dynamic terminal, intelligent home device, wearable intelligent equipment, vehicle intelligent equipment etc.；Described storage medium, for example：RAM、
ROM, magnetic disc, tape, CD, flash memory, USB flash disk, mobile hard disk, storage card, memory stick, webserver storage, network cloud storage
Deng.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, commodity or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, commodity or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", does not arrange
Except also there is other identical element in the process including the key element, method, commodity or equipment.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
Depending on protection scope of the present invention.
Claims (8)
1. a kind of construction method of the forest fire three-dimensional vision of Aviation fire drill, it is characterised in that including following step
Suddenly：
S1, obtains the latitude and longitude information and height distribution map of core simulating area, builds digital complex demodulation；Obtaining should
High-resolution satellite figure in the range of longitude and latitude, and map that to DEM, build the number in helicopter fire extinguishing core activity region
Word geographic model DTM；
S2, obtains the latitude and longitude information and satellite mapping of non-core simulating area, and according to the elevation information of its landform, manual construction is non-
The DTM of nucleus, and complete emulation dimensional topography on a large scale is made together with core simulating area；
S3, builds the tree modelling after unburned tree modelling and burning；Core simulating area is carried out into mesh generation, will not
The tree modelling of burning is planted in grid, according to satellite photo information so that tree modelling covers forest according to vegetation density
Region；
S4, using random particles system constructing flame model and smoke model；
S5, initial flame model and smoke model are set in point of origin, automatic using cellular according to the Mathematical Modeling of propagation of flame
Machine principle calculates the time of forest cellular around flame ignition, drives flame to be spread between forest cellular, and use mould
The method that type and terrain texture are replaced, the dynamically woodland scenery during simulated combustion.
2. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 1, its feature
It is that S1 comprises the following steps：
S101, the geographical elevation gray-scale map of core simulating area is obtained using open Online Map database；
S102, the gray-scale map is imported in virtual reality engine Unity 3D, and DEM is generated using its Terrain landform component,
And the size of the landform of generation is proportionally set；
S103, downloads the high definition satellite image data in the range of target longitude and latitude, and led by geographical spatial data website
Enter among Unity 3D, adjust the correspondence position of the satellite photo and the landform of S102 generations, be set to the satellite imagery of landform,
Complete the making of the DTM of fire extinguishing core space.
3. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 2, its feature
It is that S102 specifically includes following steps：
S1021, under a proportional relationship, height is carried out using the altitude information of the nucleus central point included in the gray-scale map
Correction；
S1022, under a proportional relationship, adjustment generates the size dimension of landform in Unity 3D；
S1023, continuous mapping relations are generated using linear interpolation method, generate real landform threedimensional model.
4. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 3, its feature
It is that S2 comprises the following steps：
S201, according to the space scale and ratio of target area, flat landform is set up in the core simulating area periphery；
S202, using with identical method in step S103, download corresponding region low accuracy satel-lite image data, be set to ground
The satellite imagery of shape；
S203, according to real geographical terrain information, with reference to satellite mapping, has by the landform dataller of Unity 3D, draws out ground
Shape fluctuations；
, be smoothly connected for core space landform and non-core heart district landform using the instrument of Unity 3D by S204, is completed entirely
The making of shape DTM.
5. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 1, its feature
It is that S3 comprises the following steps：
S301, using the more simplified Three-dimension Tree model in Unity 3D, adjusts its material and textures, builds two kinds of trees
Model：Tree modelling that is unburned tree modelling and having burnt；
S302, square net division is carried out by fire extinguishing core space landform；
S303, according to local forest density, the implantation number unburned tree modelling in the corresponding earth's surface of each grid is completed gloomy
Woods landscape is built.
6. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 5, its feature
Be, S302 specifically, be a basic cellular unit according to 10 meters * 10 meters of spatial dimension, by core space landform of putting out a fire
Carry out mesh generation.
7. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 1, its feature
It is that S4 comprises the following steps：
S401, sets a naked light probability of happening；
S402, a random number between 0 and 1 is produced using random function, if the random number occurs less than the naked light
Probability, then generate a particIe system in current cellular；
S403, in Unity 3D, flame model or smoke model is set to by the particIe system, completes flame model or cigarette
The structure of mist model.
8. the construction method of the forest fire three-dimensional vision of Aviation fire drill according to claim 1, its feature
It is that S5 comprises the following steps：
S501, according to emulation actual conditions, chooses a cellular in scale Forest Scene as point of origin, by flame model and smog
Model is placed in the middle of point of origin tree modelling；
S502, sets global wind direction and wind speed, is calculated using flame evolutionary model and currently catches fire cellular to 8 adjacent cellulars
Propagation factor；
S503, live wire is considered as by the outermost layer cellular of current fire area, finds all unburned cellulars adjacent with live wire,
All of flame propagation factor sum of the cellular to the cellular of catching fire around it is calculated, if the result exceedes the threshold that catches fire of setting
Value, then the cellular becomes the state of catching fire, and flame and smoke model are placed among the cellular；
S504, is the maximum time of each cellular setting sustained combustion, and after combustion process exceedes the time, the cellular is changed into combustion
State, when cellular reaches after-flame state, spent tree modelling is replaced with by the tree modelling burnt in the cellular to the greatest extent；Simultaneously
The satellite imagery of the cellular is substituted for the texture under after-flame state；Flame and smoke model are finally removed, while by the cellular
The flame propagation factor to cellular around is set to zero.
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| CN109255842B (en) * | 2018-09-25 | 2020-09-25 | 北京航空航天大学 | Visual simulation-oriented fog dynamic simulation method |
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| CN110975215A (en) * | 2019-11-26 | 2020-04-10 | 国网河南省电力公司检修公司 | Fire-fighting virtual training system establishing method, system and device |
| CN112258644A (en) * | 2020-09-24 | 2021-01-22 | 北京开云互动科技有限公司 | Forest fire spreading simulation control method and device based on virtual simulation |
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Application publication date: 20170524 Assignee: Beijing Kaiyun Interactive Technology Co.,Ltd. Assignor: BEIHANG University Contract record no.: X2021990000531 Denomination of invention: Construction method of three-dimensional forest fire scene for aviation fire fighting training Granted publication date: 20201009 License type: Exclusive License Record date: 20210831 |