CN103985148B - Rotor wing underwashing visual simulation method and system based on offshore flight - Google Patents
Rotor wing underwashing visual simulation method and system based on offshore flight Download PDFInfo
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- CN103985148B CN103985148B CN201410160087.9A CN201410160087A CN103985148B CN 103985148 B CN103985148 B CN 103985148B CN 201410160087 A CN201410160087 A CN 201410160087A CN 103985148 B CN103985148 B CN 103985148B
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Abstract
The invention discloses a rotor wing underwashing visual simulation method based on offshore flight. The method comprises the steps that S1, texture pictures of water surface ripples in the underwashing process of a helicopter rotor wing are acquired; S2, the position of a helicopter in a virtual scene is acquired, the local coordinates of the texture pictures are converted into projection coordinates, and the collected texture pictures are rendered to the virtual scene in a dynamic effect mode according to the projection coordinates; S3, an OSG is called to render a particle simulation system of an engine, and lifted water mist is added. The invention further provides a rotor wing underwashing visual simulation system based on offshore flight. According to the rotor wing underwashing visual simulation method and system based on offshore flight, the visual effect of the helicopter close to a sea surface can be truly simulated, and the adaptive capacity of a pilot for executing low level tasks can be enhanced.
Description
Technical field
The present invention relates to Scene Simulation field, more particularly to a kind of rotor downwash what comes into a driver's based on Layer Near The Sea Surface flight is imitative
True method and system.
Background technology
Vision emulation system is used for the simulation of scene out of my cabin, there is provided scene out of my cabin true to nature, is the important of aviation simulator
Ingredient.Image forming apparatus in vision emulation system generate the quality of picture quality, the height direct relation of performance and
Can pilot make correct judgement to scene, have very important significance.
Ocean Development of Module in vision emulation system occupies an important position, and exploitation of the China in this field is also located
In initial stage, with regard to washing under lifting airscrew, the motion of rotor, partial air are attached to rotor surface, and air is also compressed.
Rotor upper surface pressure is little, and lower surface pressure is big, between rotor upper and lower surface produces lift, due to height during helicopter flight
Constant, the big air of lower surface pressure can flow downwards, form downwash flow, and rotor downwash what comes into a driver's includes Layer Near The Sea Surface vortex flow
The circular wave that the water smoke and main rotor kicked up blows open.Existing vision emulation system is rested on mostly and builds test vortex flow
It is on aerodynamic model, also unprecedented that rotor downwash is emulated.
Therefore, existing aviation simulator vision emulation system is more weak to ocean Development of Module strength, for close sea
Special-effect (such as rotor downwash) exploitation in face still belongs to blank, drastically influence pilot for visually sentencing when being close to sea
Read, and the subject training of special circumstances (as altimeter is bad) can not be launched.
The content of the invention
The present invention proposes a kind of rotor downwash simulation method flown based on Layer Near The Sea Surface and system, realizes based near
The rotor downwash vision simulation of sea flight, is that pilot builds a training environment true to nature, improves pilot for pressing close to
Ability of emergency management during sea.
A kind of rotor downwash simulation method flown based on Layer Near The Sea Surface proposed by the present invention, is comprised the following steps：
S1, the texture picture for obtaining water surface ripple when washing under lifting airscrew；
The texture picture local coordinate system is converted into projection coordinate by S2, position of the acquisition helicopter in virtual scene,
The texture picture of collection is rendered in virtual scene with dynamic effect according to the projection coordinate；
S3, the particle simulation system for calling OSG rendering engines, add the water smoke kicked up.
Preferably, the texture picture size be 512 × 512 pixels, 32 colors, the tga forms with transparent channel.
Preferably, the S2 is comprised the following steps：
S2-A, arranges what comes into a driver's matrix V iewMatrix and the projection matrix ProjectMatrix of projection camera, obtains model
What comes into a driver's projection matrix value MVP, the MVP=ViewMatrix × ProjectMatrix；
S2-B, arranges the displacement factor OffValue of texture picture scaling, obtains the zoom factor ScaleValue of texture,
Formula used is：ScaleValue=1.0f-mod (TimeSimu+OffValue, 1.0f), in formula, TimeSimu is each frame
Image from counter；
S2-C, according to texture scale coefficient S caleValue that step S2-B is obtained, obtains texture scale matrix
ScaleMatrix；
The texture scale square that S2-D, the model what comes into a driver's projection matrix MVP obtained according to step S2-A and step S2-C are obtained
Battle array ScaleMatrix, modeling try to achieve the coordinate Coord for being rendered into texture picture in virtual scene, and institute's established model is：
Coord=mr × MVP × ScaleMatrix × ViewMatrixInverse × gl_ModelViewMatrix ×
gl_Vertex
In a model, mr is translation matrix, is that texture picture needs mobile distance in virtual scene；
ViewMatrixInverse is what comes into a driver's inverse of a matrix matrix；Gl_ModelViewMatrix is model what comes into a driver's matrix, is that OSG draws
The built-in variable held up；Gl_Vertex is model vertices local coordinate, is the built-in variable of OSG engines；
S2-E, according to the texture coordinate Coord that S2-D is obtained is rendered into raised grain in virtual scene.
Preferably, the projection camera is placed in lifting airscrew center position, and direction is vertically downward.
Preferably, the projector distance of the projection matrix ProjectMatrix is 20 meters, and projection ratio is 1:1.
Preferably, the S3 is comprised the following steps：
S3-A, writes the action algorithm of ripple picture, arranges ripple power effect, produces the transparent dough sheet of water smoke；
S3-B, OSG particle simulation system arranges water smoke size and life cycle according to vehicle flight speeds.
Preferably, using the action algorithm of PhotsShop software programming ripple pictures, ripple power effect is set, is made
Go out the transparent dough sheet of water smoke.
A kind of rotor downwash vision emulation system flown based on Layer Near The Sea Surface that the present invention is also proposed, including：
Texture picture acquisition module, the texture picture of water surface ripple when washing under lifting airscrew for obtaining；
Rendering module, and the texture picture acquisition module, for obtaining position of the helicopter in virtual scene, by institute
State texture picture local coordinate system and be converted into projection coordinate, according to the projection coordinate by the texture picture for gathering with dynamic effect wash with watercolours
Contaminate in virtual scene；
Water smoke add module, is connected with the rendering module, for calling the particle simulation system of OSG rendering engines, is added
Plus the water smoke kicked up.
Preferably, the rendering module includes：
Submodule is set, for arranging what comes into a driver's matrix V iewMatrix and the projection matrix of projection camera
ProjectMatrix, obtains model what comes into a driver's projection matrix value MVP, the MVP=ViewMatrix × ProjectMatrix；
Superposition submodule, is connected with the setting submodule, for being superimposed using four identical ripple pictures,
The displacement factor OffValue of ripple picture is respectively 0.2,0.4,0.6,0.8, obtains four scalings by different displacement factors
Coefficient S caleValue；
Texture scale matrix submodule, is connected with the superposition submodule, for according to four texture scale coefficients
ScaleValue, is obtained four texture scale matrix ScaleMatrix, and ScaleMatrix is 4 × 4 matrixes；
Submodule is rendered, is connected with the texture scale matrix submodule, for taking advantage of the texture of scaled matrix by four
Picture is rendered in scene.
In the present invention, sea ripple is combined with vortex flow water smoke and is rendered, really can be close to sea by helicopter simulating
When what comes into a driver's effect, strengthen pilot perform low latitude task adaptability, can improve pilot perform task success rate, drop
The accident rate of low operation on the sea；And the sustainable expansion for departing from the special project flight training of altimeter instrument, practicality height.
Description of the drawings
Fig. 1 is a kind of rotor downwash simulation method flow process flown based on Layer Near The Sea Surface that the embodiment of the present invention is proposed
Figure；
Fig. 2 is a kind of rotor downwash vision emulation system structure flown based on Layer Near The Sea Surface that the embodiment of the present invention is proposed
Figure.
Specific embodiment
As shown in figure 1, a kind of rotor downwash vision simulation flown based on Layer Near The Sea Surface that Fig. 1 is the embodiment of the present invention to be proposed
Method flow diagram.
With reference to Fig. 1, the embodiment of the present invention proposes a kind of rotor downwash simulation method flown based on Layer Near The Sea Surface, bag
Include following steps：
S1, by performing the analysis and process of approximately level task video data to conventional helicopter, obtains under a rotor
The texture picture of water surface ripple when washing, for example, picture size is 512 × 512 pixels, and 32 colors, form are band transparent channel
Tga forms.
S2, obtains position of the helicopter in virtual scene, the texture picture local coordinate system is converted into projection coordinate,
The texture picture is rendered in virtual scene with dynamic effect according to the projection coordinate, is comprised the following steps：
S2-A, arranges what comes into a driver's matrix V iewMatrix and the projection matrix ProjectMatrix of projection camera, wherein, throws
Shade machine is placed in lifting airscrew center position, and direction is vertically downward；The projection of projection matrix ProjectMatrix is set
Distance is 20 meters, and projection ratio is 1:1, what comes into a driver's matrix V iewMatrix is multiplied with projection matrix ProjectMatrix and obtain
Model what comes into a driver's projection matrix MVP；
S2-B, is superimposed using four identical ripple pictures, the displacement factor OffValue difference of ripple picture
For 0.2,0.4,0.6,0.8, four zoom factor ScaleValue, the calculating of ScaleValue are obtained by different displacement factors
Formula is：ScaleValue=1.0f-mod (TimeSimu+OffValue, 1.0f), in formula, TimeSimu is each two field picture
From counter；
S2-C, according to four texture scale coefficient Ss caleValue that S2-B is obtained, is obtained four texture scale matrixes
ScaleMatrix, ScaleMatrix are 4 × 4 matrixes, and form is：
ScaleValue, 0.0,0.0,0.0,0.0, ScaleValue, 0.0,0.0,0.0,0.0, ScaleValue,
0.0,0.0,0.0,0.0,1.0 }.
S2-D, the texture picture that four are taken advantage of scaled matrix is rendered in scene, and formula used is：Coord=mr ×
MVP × ScaleMatrix × ViewMatrixInverse × gl_ModelViewMatrix × gl_Vertex, in formula, mr is
Translation matrix, in virtual scene, is moved to the left a half-distance of former texture width, move down the half of former texture height away from
From now four texture pictures are in the underface of lifting airscrew；MVP is model what comes into a driver's projection matrix；ScaleMatrix is
Texture scale matrix；ViewMatrixInverse is what comes into a driver's inverse of a matrix matrix；Gl_ModelViewMatrix is model what comes into a driver's
Matrix, is the built-in variable of OSG engines；Gl_Vertex is model vertices local coordinate, is the built-in variable of OSG engines.Go straight up to
Dynamic ripple below machine is exhaled from centre to surrounding, and dither cycle, and effect is true to nature.
S3, calls the particle simulation system of OSG rendering engines, dynamic addition water smoke.Comprise the following steps：
S3-A, using one particle dough sheet with transparent texture of PhotoShop software development；
S3-B, the correspondence setting of number of particles and foundation following table life cycle in particle simulation system.
| Air speed (km/h) | Particle weight (individual/second) | Transmission interval (second) |
| 0～20 | 3600 | 0.1 |
| 20～60 | 2000 | 0.2 |
| 60～120 | 900 | 0.3 |
| More than 120 | 20 | 0.5 |
As shown in Fig. 2 a kind of rotor downwash vision simulation flown based on Layer Near The Sea Surface that Fig. 2 is the embodiment of the present invention to be proposed
System construction drawing.
With reference to Fig. 2, a kind of rotor downwash vision emulation system flown based on Layer Near The Sea Surface provided in an embodiment of the present invention, bag
Include：
Texture picture acquisition module 10, the texture picture of water surface ripple when washing under lifting airscrew for obtaining；
Rendering module 20, is connected with the texture picture acquisition module 10, for obtaining helicopter in virtual scene
The texture picture local coordinate system is converted into projection coordinate by position, according to the projection coordinate by gather texture picture with
Dynamic effect is rendered in virtual scene；
Water smoke add module 30, is connected with the rendering module 20, for calling the particle simulation system of OSG rendering engines
System, adds the water smoke kicked up.
Wherein, the rendering module 20 includes：Submodule 21 is set, for arranging the what comes into a driver's matrix of projection camera
ViewMatrix and projection matrix ProjectMatrix, obtains model what comes into a driver's projection matrix value MVP, the MVP=
ViewMatrix×ProjectMatrix；Superposition submodule 22, is connected with the setting submodule 21, for using four phases
Same ripple picture is superimposed, and the displacement factor OffValue of ripple picture is respectively 0.2,0.4,0.6,0.8, by difference
Displacement factor obtain four zoom factor ScaleValue；Texture scale matrix submodule 23, is superimposed submodule 22 with described
Connection, for according to four texture scale coefficient Ss caleValue, four texture scale matrix ScaleMatrix being obtained,
ScaleMatrix is 4 × 4 matrixes；Submodule 24 is rendered, is connected with the texture scale matrix submodule 23, for by four
The texture picture of scaled matrix is taken advantage of to be rendered in scene.
In the present invention, sea ripple is combined with vortex flow water smoke and is rendered, really can be close to sea by helicopter simulating
When what comes into a driver's effect, strengthen pilot perform low latitude task adaptability, can improve pilot perform task success rate, drop
The accident rate of low operation on the sea；And the sustainable expansion for departing from the special project flight training of altimeter instrument, practicality height.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept equivalent or change in addition, should all be included within the scope of the present invention.
Claims (7)
1. it is a kind of based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that comprise the following steps：
S1, the texture picture for obtaining water surface ripple when washing under lifting airscrew；
The texture picture local coordinate system is converted into projection coordinate by S2, position of the acquisition helicopter in virtual scene, according to
The texture picture of collection is rendered in virtual scene by the projection coordinate with dynamic effect；
S3, the particle simulation system for calling OSG rendering engines, add the water smoke kicked up；
The S2 is comprised the following steps：
S2-A, arranges what comes into a driver's matrix V iewMatrix and the projection matrix ProjectMatrix of projection camera, obtains model what comes into a driver's
Projection matrix MVP, the MVP=ViewMatrix × ProjectMatrix；
S2-B, arranges the displacement factor OffValue of texture picture scaling, obtains the zoom factor ScaleValue of texture, used
Formula is：ScaleValue=1.0f-mod (TimeSimu+OffValue, 1.0f), in formula, TimeSimu is each two field picture
From counter；
S2-C, according to texture scale coefficient S caleValue that step S2-B is obtained, obtains texture scale matrix
ScaleMatrix；
The texture scale matrix that S2-D, the model what comes into a driver's projection matrix MVP obtained according to step S2-A and step S2-C are obtained
ScaleMatrix, modeling try to achieve the coordinate Coord for being rendered into texture picture in virtual scene, and institute's established model is：
Coord=mr × MVP × ScaleMatrix × ViewMatrixInverse × gl_ModelViewMatrix × gl_
Vertex
In a model, mr is translation matrix, is that texture picture needs mobile distance in virtual scene；
ViewMatrixInverse is what comes into a driver's inverse of a matrix matrix；Gl_ModelViewMatrix is model what comes into a driver's matrix, is that OSG draws
The built-in variable held up；Gl_Vertex is model vertices local coordinate, is the built-in variable of OSG engines；
S2-E, according to the texture picture coordinate Coord that S2-D is obtained is rendered into raised grain in virtual scene.
2. it is according to claim 1 based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that it is described
Texture picture size be 512 × 512 pixels, 32 colors, the tga forms with transparent channel.
3. it is according to claim 1 based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that it is described
Projection camera is placed in lifting airscrew center position, and direction is vertically downward.
4. it is according to claim 1 based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that it is described
The projector distance of projection matrix ProjectMatrix is 20 meters, and projection ratio is 1:1.
5. it is according to claim 1 based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that it is described
S3 is comprised the following steps：
S3-A, writes the action algorithm of the texture picture of water surface ripple, arranges ripple power effect, produces the transparent area of water smoke
Piece；
S3-B, OSG particle simulation system arranges water smoke size and life cycle according to vehicle flight speeds.
6. it is according to claim 5 based on Layer Near The Sea Surface fly rotor downwash simulation method, it is characterised in that utilize
The action algorithm of the texture picture of PhotoShop software programming water surface ripples, arranges ripple power effect, produces the saturating of water smoke
Bright dough sheet.
7. it is a kind of based on Layer Near The Sea Surface fly rotor downwash vision emulation system, it is characterised in that include：
Texture picture acquisition module, the texture picture of water surface ripple when washing under lifting airscrew for obtaining；
Rendering module, is connected with the texture picture acquisition module, for obtaining position of the helicopter in virtual scene, by institute
State texture picture local coordinate system and be converted into projection coordinate, according to the projection coordinate by the texture picture for gathering with dynamic effect wash with watercolours
Contaminate in virtual scene；
Water smoke add module, is connected with the rendering module, for calling the particle simulation system of OSG rendering engines, addition to raise
The water smoke for rising；
The rendering module includes：
Submodule is set, for arranging what comes into a driver's matrix V iewMatrix and the projection matrix ProjectMatrix of projection camera, is obtained
Obtain model what comes into a driver's projection matrix MVP, the MVP=ViewMatrix × ProjectMatrix；
Superposition submodule, is connected with the setting submodule, for being superimposed using four identical ripple pictures, ripple
The displacement factor OffValue of picture is respectively 0.2,0.4,0.6,0.8, obtains four zoom factors by different displacement factors
ScaleValue；
Texture scale matrix submodule, is connected with the superposition submodule, for according to four texture scale coefficients
ScaleValue, is obtained four texture scale matrix ScaleMatrix, and ScaleMatrix is 4 × 4 matrixes；
Submodule is rendered, is connected with the texture scale matrix submodule, for taking advantage of the texture picture of scaled matrix by four
It is rendered in scene.
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| EP3094082A1 (en) * | 2015-05-13 | 2016-11-16 | AIM Sport Vision AG | Digitally overlaying an image with another image |
| CN105654542B (en) * | 2015-12-22 | 2018-11-20 | 成都艾尔伯特科技有限责任公司 | virtual airport model surface texture projection rendering method |
| CN113221259B (en) * | 2021-07-08 | 2021-09-21 | 北京航空航天大学 | Helicopter task simulation flow construction method for offshore oil spill disposal |
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