CN106201510B - A kind of communication means of UE4 particIe system and external data - Google Patents
A kind of communication means of UE4 particIe system and external data Download PDFInfo
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- CN106201510B CN106201510B CN201610541275.5A CN201610541275A CN106201510B CN 106201510 B CN106201510 B CN 106201510B CN 201610541275 A CN201610541275 A CN 201610541275A CN 106201510 B CN106201510 B CN 106201510B
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Abstract
The invention discloses the communication means of a kind of UE4 particIe system and external data, and the invention belongs to field of virtual reality, including multiple transmitters, each transmitter emits specific particle, and the particle that multiple transmitters emit jointly forms a complete particIe system.The present invention realizes the communication of UE4 and external data, the simulation effect of particIe system can be controlled by external data, the real-life scene of simulation and event that both can be more life-like also greatly improve the real-time of simulation；In academic research, the data that algorithm can also be obtained are transmitted in particIe system, are shown in visual form, are increased learning value.
Description
Technical field
The invention belongs to field of virtual reality, and in particular to a kind of communication means of UE4 particIe system and external data.
Background technique
Unreal Engine4 (hereinafter referred to as UE4) is the illusory engine of the newest release of Epic Games company, is one
Money is used for the virtual reality software of three-dimensional scenic building, and the crowd including game, animation, virtual reality can be made using the engine
More contents equally can be used for many industries such as indoor design, military simulation.In visual editor, exploit person
Member directly can freely be put to the object in virtual scene and the control of attribute, and is all real-time rendering.UE4 is same
When provide absolutely open source code, exploitation staff development class can be allowed to realize desired result.These all make
UE4 can preferably simulate real-life scene and event and interact in real time with the external world.
UE4 provides powerful particIe system simultaneously, preferably can be used to simulate irregular such as cloud, fire, plant
Natural scene.ParticIe system dimensional Modeling Technology different from the past, the scene of simulation is resolved into many random distributions by it
Fine particle, each particle have one's own attribute and over time constantly variation, so as to dynamic
Simulation natural scene variation.The basic thought of particIe system is: need to scene to be simulated resolve into a large amount of point particle,
Line particle or face particle simulate the dynamic change of scene by controlling the motion profile of a large amount of particles.Wherein each grain
Son has the attribute of oneself, and specific attribute feature is by needing scene to be simulated to determine.The change of particle effect is exactly to pass through to repair
Change the parameter realization of particle.
In some particle effects that current UE 4 provides, the most of special effect of simulation that can be very true to nature, these are special
What effect effect was related to is transmitted inside UE4 with internal data, this be to the exploitation of UE4 it is inadequate, it is some based on UE4's
The simulation of reality scene is also unable to reach real-time vivid effect.And in the research of particIe system, the irregularities such as fire, smog
The algorithm of body is research emphasis therein, and during the data for obtaining algorithm are converted into real-time simulation, communication becomes
Intermediate portions therein, if lacking the communication with external data, the researching value of the science will have a greatly reduced quality, also can not
More true analog natural scene.
Summary of the invention
For the above-mentioned technical problems in the prior art, the invention proposes a kind of UE4 particIe system and external numbers
According to communication means, design rationally, overcome the deficiencies in the prior art, have good promotion effect.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of UE4 particIe system, including multiple transmitters, each transmitter emit specific particle, and multiple transmitters are total
Particle with transmitting forms a complete particIe system.
In addition, the present invention is also mentioned that the communication means of a kind of UE4 particIe system and external data, using as described above
UE4 particIe system carries out in accordance with the following steps:
Step 1: each transmitter includes different module, changes the dynamic of particle by addition, removing module, passes through a little
The data type that module understands module intrinsic parameter is hit, the size by changing parameter observes the change that particIe system simulates effect；
Step 2: the particIe system of original state is created in the editing machine of UE4
Several transmitters are added in particIe system as needed, addition includes Required mould in each transmitter
Including block, Spawn module, Lifetime module, InitialSize module, InitialVelocity module, Color module
Module；
Step 3: newly-built C++ class simultaneously binds the particIe system created in step 2
Step 3.1: newly-built C++ class
Step 3.1.1: opening UE4 editing machine, creates C++ class, inherits Actor parent；
Step 3.1.2: after newly-built C++ class, UE4 automatically opens Microsoft Visual Studio, and puts up basic
Program frame, generate .cpp the and .h file of class；
Step 3.2: binding particIe system
Step 3.2.1: the path of particIe system is found；
Step 3.2.2: it is bound in step 2 in the .cpp file of C++ class by Cast<UParticleSystem>function
The particIe system of creation；
Step 4: the interface function of modification particIe system parameter is write in Microsoft Visual Studio
Step 4.1: opening the installation site of UE4, read the source code program of particIe system, find the operation mould of particIe system
Formula finds the function in particIe system about parameter；
Step 4.2: writing interface function
Step 4.2.1: pass through MyEffect- > Emitters [i] function and find the transmitter to be modified；
Step 4.2.2: passing through MyEmitter- > LODLevels [i] function and find the module to be modified in transmitter,
The parameter to be modified is found under module, and data received in interface function are assigned to the parameter to be modified, different parameters pair
Different interface functions is answered, wherein the received data type of interface function wants consistent with the data type of parameter of modification；
Step 5: writing function and read text data
Step 5.1: finding the platform file interface of UE4
The source code of IPlatformFile is found in the source code program of UE4, and finds the interface of IPlatformFile；
Step 5.2: the format for the text file to be read is set in txt file；
Step 5.3: writing text interface function: writing the function for reading text in .cpp file
Step 5.3.1: finding the path of the text file of reading, binds text by FPlatformFileManager function
This document；
Step 5.3.2: the data in text file are cached and is converted by LoadFileToString function
String format；
Step 5.4: reading text data
Step 5.4.1: each of a line data are read according to space；
Step 5.4.2: the data conversion of reading is assigned at data type required for parameter by grain by Atof function
Received parameter in subsystem interface function；
Step 5.4.3: after having read a line, next line to the last a line is and then read；
Step 5.4.4: the final data read in complete text realize the communication of particIe system and external data.
Advantageous effects brought by the present invention:
The invention proposes the communication means of a kind of UE4 particIe system and external data, compared with prior art, the present invention
The communication of UE4 and external data is realized, the simulation effect of particIe system can be controlled by external data, it both can be more
The real-life scene of simulation true to nature and event, also greatly improve the real-time of simulation；It, can also in academic research
It is transmitted in particIe system with the data for obtaining algorithm, is shown in visual form, increase learning value.
Detailed description of the invention
Fig. 1 is the flow diagram of the communication means of a kind of UE4 particIe system of the present invention and external data.
Specific embodiment
With reference to the accompanying drawing and specific embodiment invention is further described in detail:
Embodiment 1:
A kind of UE4 particIe system based on text file, including multiple transmitters, each transmitter emit specific grain
Son, the particle that multiple transmitters emit jointly form a complete particIe system.
Embodiment 2:
On the basis of the above embodiments, the present invention is also mentioned that a kind of UE4 particIe system based on text file and external
The communication means (as shown in Figure 1) of data carries out in accordance with the following steps:
Step 1: adding or deleting transmitter, the transmitter module of particIe system, changes module parameter, observation simulation effect
Fruit.
In the editing interface of UE4 particIe system, add or delete particIe system transmitter and transmitter it is each
Module changes parameter, observation simulation effect.ParticIe system is made of multiple transmitters, and each transmitter emits specific particle,
Multiple transmitters emit particle jointly and form a complete particIe system.Each transmitter includes different module.It can lead to
Cross addition, removing module changes the dynamic of particle.The data type that parameter can be understood after click module in details panel, leads to
Cross the change for changing the size observation particIe system simulation effect of parameter.The essential attribute of particle mainly include the following types:
Material: being present in Required module, is the material applied in particle, and material is done more true to nature, particle
System is simulated more accurate.
Rate: being present in Spawn module, refers to the production rate of particle, that is, the particle of particIe system transmitting per second
Quantity.By the Rate for changing particle, thus it is possible to vary the entire size of particIe system and the closeness of transmitting.
Lifetime: being present in Lifetime module, and the life cycle (in seconds) of single particle, numerical value is bigger,
The particle time-to-live is longer.
StartSize: being present in InitialSize module, refers to the initial size of particle, passes through change
The numerical value of StartSize can change particle in the size in three directions (x, y, z) respectively.
StartVelocity: being present in InitialVelocity module, refers to the initial velocity of particle, passes through change
The numerical value of StartVelocity can change particle in the rate in three directions (x, y, z) respectively.
ColorOverLife: being present in Color module, refers to the variation at any time of the color of particle and changes.
AlphaOverLife: being present in Color module, refers to the variation at any time of the transparency of particle and changes.
Step 2: particIe system is created in editing machine
ParticIe system is created in UE4 editing machine, transmitter is added as needed, adds corresponding mould in the transmitter
Block.Target component (parameter that will be changed by interface function) sets initial value, creates the particIe system of an original state.
Step 3: newly-built C++ class simultaneously binds the particIe system created before
1, C++ class is created
UE4 editing machine is opened, C++ class is created, inherits Actor parent.
After creating C++ class, UE4 can automatically open Microsoft Visual Studio (hereinafter referred to as VS), and put up
Basic program frame generates .cpp the and .h file of class.
2, particIe system is bound
The path for finding particIe system passes through Cast<UParticleSystem>in the .cpp file of C++ class
(StaticLoadObject (UParticleSystem::StaticClass (), NULL, * EffectName.ToS tring
())) function (the function passage path finds the particIe system of creation, wherein EffectName be particIe system path) tie up
The particIe system created before fixed.
Step 4: the interface function of particIe system is write
1, the operational mode and parametric function of particIe system are found
Bind particIe system after, open the installation site of UE4, Epic Games 4.9 Engine Source
Runtime Engine Classes the source code program of particIe system is found in Particles file, find particIe system
About the function of parameter in operational mode and particIe system.
2, interface function is write
The interface function of modification particIe system parameter is write in VS.The interface of the corresponding particIe system of each parameter
Function.Wherein interface function can receive data parameters.In interface function, pass through MyEffect- > Emitters [i] function
(transmitter in position particles system) finds transmitter Emitters [i] to be modified, pass through in the transmitter MyEmitter- >
LODLevels [i] function (module in location transmitters) finds the module Module to be modified, and finding under module will modify
Parameter.Data received in interface function are assigned to the parameter to be modified.Different parameters corresponds to different interface functions.
Wherein the received data type of interface function wants consistent with the data type of parameter of modification.
Step 5: it writes function and reads text data, realize the communication of external data and particIe system
1, UE4 platform file interface is found
For its portability so C++ java standard library cannot be used directly when carrying out file I/O operation in UE4, UE4 is provided
IPlatformFile (platform file I/O interface).Found in the source code program of UE4 the source code of IPlatformFile with
And the interface modes of IPlatformFile.
2, data format in text is set
First have to the format that the file of reading is set in txt file.It can be distinguished by space, line feed etc. in UE4
Data.In text file, the data type of data is floating type.The data of every a line indicate the parameter to be modified, for example, often
First data of a line are the rates to be modified, and second to fourth data is the every number of the initial size ... to be modified
It is separated according between data by space.
3, text interface function is write
The function for reading text is write in .cpp file.The path for finding the text file of reading first, passes through
FPlatformFileManager::Get () .GetPlatformFile () .FileExists (* CompleteFilePath))
Function (function of management text, passage path bind text file, and wherein CompleteFilePath is the path of text) is tied up
Determine text file.By the data in text file by LoadFileToString function (by the data buffer storage in text at word
Accord with the format of string) it caches and is converted into string format.
4, text data is read
Read each of a line data according to space (" "), by data by Atof function (change data format
Function) it is converted into data type required for parameter, it is assigned to received parameter in particIe system interface function head.Read one
After row, next line to the last a line is read according to line feed T (" n ").It is final to read the data completed in entire text, it realizes
The communication of particIe system and external data.
The present invention realizes the communication of UE4 particIe system and external data, can control particle systems by external data
The simulation effect of system, the real-life scene of simulation and event that both can be more life-like, also greatly improves simulation
Real-time；In academic research, the data that algorithm can also be obtained are transmitted in particIe system, are showed in visual form
Out, learning value is increased.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (1)
1. a kind of communication means of UE4 particIe system and external data, it is characterised in that: use a kind of UE4 particIe system, this is
System includes multiple transmitters, and each transmitter emits specific particle, and the particle composition one that multiple transmitters emit jointly is complete
Whole particIe system；Specifically carry out in accordance with the following steps:
Step 1: the particIe system of original state is created in the editing machine of UE4；
Several transmitters are added in particIe system as needed, in each transmitter addition include Required module,
Mould including Spawn module, Lifetime module, InitialSize module, InitialVelocity module, Color module
Block；
Step 2: newly-built C++ class simultaneously binds the particIe system created in step 1；
Step 2.1: newly-built C++ class；
Step 2.1.1: opening UE4 editing machine, creates C++ class, inherits Actor parent；
Step 2.1.2: after newly-built C++ class, UE4 automatically opens Microsoft Visual Studio, and puts up basic journey
Sequence frame generates .cpp the and .h file of class；
Step 2.2: binding particIe system；
Step 2.2.1: the path of particIe system is found；
Step 2.2.2: it finds in step 1 and creates by Cast<UParticleSystem>function in the .cpp file of C++ class
ParticIe system and bound；
Step 3: the interface function of modification particIe system parameter is write in Microsoft Visual Studio；
Step 3.1: passing through MyEffect- > Emitters [i] function and find the transmitter to be modified；
Step 3.2: passing through MyEmitter- > LODLevels [i] function and find the module to be modified in transmitter, under module
The parameter to be modified is found, data received in interface function are assigned to the parameter to be modified, different parameters is corresponding different
Interface function, wherein the received data type of interface function want with modification the data type of parameter it is consistent；
Step 4: writing function and read text data；
Step 4.1: setting the format for the text file to be read；
Step 4.2: the interface function for reading text is write in .cpp file；
Step 4.2.1: finding the path of the text file of reading, manages text simultaneously by FPlatformFileManager function
Bind text file；
Step 4.2.2: the data in text file are cached by LoadFileToString function and are converted into character
String format；
Step 4.3: reading text data；
Step 4.3.1: each of a line data are read；
Step 4.3.2: by Atof function by the data conversion of reading at data type required for parameter, and it is assigned to particle
Received parameter in system interface function；
Step 4.3.3: after having read a line, next line to the last a line is and then read；
Step 4.3.4: the final data read in complete text realize the communication of particIe system and external data.
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| CN108762617A (en) * | 2018-05-31 | 2018-11-06 | 苏州蜗牛数字科技股份有限公司 | UI interactive systems, method and storage medium in a kind of VR environment |
| CN111930362A (en) * | 2020-07-23 | 2020-11-13 | 上海珀立信息科技有限公司 | Prefab development system and creation method based on UE4 platform |
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| CN104571993A (en) * | 2014-12-30 | 2015-04-29 | 北京像素软件科技股份有限公司 | Processing method of particle system, display card and mobile application platform |
| CN105204988A (en) * | 2014-06-30 | 2015-12-30 | 北京安兔兔科技有限公司 | Testing method and system of electronic equipment game performance |
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| CN105204988A (en) * | 2014-06-30 | 2015-12-30 | 北京安兔兔科技有限公司 | Testing method and system of electronic equipment game performance |
| CN104571993A (en) * | 2014-12-30 | 2015-04-29 | 北京像素软件科技股份有限公司 | Processing method of particle system, display card and mobile application platform |
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