CN107918646A - A kind of three-dimensional modeling data processing method and processing device based on protocol mode - Google Patents

A kind of three-dimensional modeling data processing method and processing device based on protocol mode Download PDF

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Publication number
CN107918646A
CN107918646A CN201711091692.5A CN201711091692A CN107918646A CN 107918646 A CN107918646 A CN 107918646A CN 201711091692 A CN201711091692 A CN 201711091692A CN 107918646 A CN107918646 A CN 107918646A
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data
face
model
vertex
grouping information
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CN107918646B (en
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崔树林
庄滨滨
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Zhuhai Baifeng Network Technology Co Ltd
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Zhuhai Baifeng Network Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/13—File access structures, e.g. distributed indices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/17—Details of further file system functions
    • G06F16/174—Redundancy elimination performed by the file system
    • G06F16/1744—Redundancy elimination performed by the file system using compression, e.g. sparse files

Abstract

The present invention provides a kind of highly efficient data processing method and device, storage order and storage content are defined by way of agreement, use binary storage data, only retain most important grid data, some invalid data are rejected, and reach the effect of compressed data by way of memory space dynamic allocation.The technical scheme is that a kind of three-dimensional modeling data processing method based on protocol mode, including：Coding step, model file data are encoded, and are divided into model file head, grouping information and grid data；Compression step, parses three-dimensional model gridding data, the model face data after parsing is converted to gore data, dynamic arranges standard geometric data and data texturing and rejects invalid data, re-writes grouping information and grid data.

Description

A kind of three-dimensional modeling data processing method and processing device based on protocol mode
Technical field
The present invention relates to three-dimensional modeling data coding and the processing method of compression, belongs to the technology that three-dimensional graphics images are handled Field.
Background technology
Commonly used threedimensional model form such as obj, dae etc. on the market, often there are it is several obvious the defects of, when They are all plain text formats so that seldom data, which need to provide substantial amounts of space, to be stored, second, plain text causes text Part parsing needs to expend more times, third, redundant data is relatively more.This model is not easy to directly in transmission over networks, past Used toward needing packing to be in advance previously downloaded to enterprising exercise of user computer in the application.
In practical applications, having much needs the demand of real-time loading threedimensional model, such as is presented three on WebGL websites During dimension module, this requires the size of model must be lacked as far as possible, to prevent user when accessing because the load time is long And the problems such as causing poor user experience.
The content of the invention
The present invention provides a kind of highly efficient data processing method, defined by way of agreement storage order and Storage content, using binary storage data, only retains most important grid data, rejects some invalid data, and lead to The mode for crossing memory space dynamic allocation reaches the effect of compressed data.
On the one hand technical scheme is a kind of three-dimensional modeling data processing method based on protocol mode.This method Including：
Coding step, model file data are encoded, and are divided into model file head, grouping information and grid data；
Compression step, parses three-dimensional model gridding data, the model face data after parsing is converted to gore data, Dynamic arranges standard geometric data and data texturing and rejects invalid data, re-writes grouping information and grid data.
Further, in the coding step：Model file head includes format version number, marshalling number, whether enables ring Border light masking passage, each grouping information the space occupied；Grouping information includes group names, packet vertex data start bit Put, normal data initial position, texture coordinate initial position, ambient light masking passage texture coordinate initial position, vertex number, Face number, each face data take byte number；Vertex of the grid data including all packets, normal, texture coordinate knead dough data, And it is indexed by grouping information.
Further, the compression step reads storehouse instrument using threedimensional model and the model file of coding is solved Analysis, obtains the grid data of model, which reads storehouse instrument and increase income storehouse including Assimp.
Further, the compression step includes：It is unified that the face of quadrangle of model or the face of polygon are converted into triangle Shape face；The grid data of arrangement standard is simultaneously stored in array, then precalculates data volume；Judge whether file carries environment Light covers texture coordinate passage, has and then stores the related data of ambient light masking passage texture coordinate into array.
Further, in the compression step, write-in grouping information includes：Since being organized into groups first, by vertex data Initial position for file header and grouping information occupied space sum, wherein File header information occupied space is recorded as Hsize, Marshalling number is denoted as Gcount, single grouping information length is denoted as Gsize, first marshalling vertex data initial position is denoted as Pbegin, Then Pbegin=Gcount×Gsize+Hsize；Vertex data number is the length of the packet vertex data array, is denoted as Pcount；When Each vertex data is one and and is each worth by x, y, z, the three-dimensional vector of composition and takes 4 bytes, and thus vertex data accounts for Space is Psize=Pcount×3×4；The data start of normal is Nbegin=Pbegin+Pcount+Psize；The number of normal Data amount check according to number, the data amount check on vertex and texture coordinate is consistent, is unified for Pcount；Normal data is equally It is made of a three-dimensional vector, the initial position of texture coordinate data is Ubegin=Nbegin+Psize；Texture coordinate is a two dimension Vector composition, then the initial position of face data is Fbegin=Ubegin+Pcount×2×4；Grouping information is write one by one, until all Marshalling write-in new file.
Further：The byte number shared by the data of face is dynamically changed when arranging grid data；For each face data Record defines the index on three vertex；When vertex data number is less than 215, the space of two bytes just represents all face ropes enough When drawing, the space of two bytes is distributed to each face data；Otherwise the space of nybble is distributed.
Technical scheme second aspect is a kind of three-dimensional modeling data processing unit based on protocol mode, bag Include：Coding module, for model file data to be encoded, is divided into model file head, grouping information and grid data；Compression Model face data after parsing for parsing three-dimensional model gridding data, are converted to gore data, dynamic arranges by module Standard geometric data and data texturing and invalid data is rejected, re-write grouping information and grid data.
Further, the compression module includes：First submodule, face or polygon for the unified quadrangle by model Face be converted into gore；Second submodule, for arranging the grid data of standard and being stored in array, is then counted in advance Calculate data volume；3rd submodule, for judging that file whether with ambient light masking texture coordinate passage, has, ambient light is hidden The related data for covering passage texture coordinate is stored into array.
The technical scheme third aspect is a kind of three-dimensional modeling data processing unit based on protocol mode, bag Include：Memory, it stores instruction；Processor, the above method is realized for performing the instruction.
Technical scheme fourth aspect is a kind of computer-readable recording medium, is stored thereon with computer journey Sequence, the program realize the above method when being executed by processor.
The beneficial effects of the present invention are：Model meshes data are stored with compact binary form, and by dynamic State change face data shared by byte number, reach reduction data space so that model can rapidly in internet into Row transmission, parsing, improve the access speed of Web site.
Beneficial effects of the present invention also reside in：First, use binary storage mode so that the utilization rate higher of file, Make hard-disk capacity less shared by identical data；Second, the space stored by dynamic modification face data so that model volume Smaller；Third, being stored in a binary fashion, it is easier to parse than text storage.
Brief description of the drawings
Fig. 1 is the main flow block diagram of the method according to the invention；
Fig. 2 is the model file data structure schematic diagram of coding step process in the method according to the invention；
Fig. 3 is the compression step flow chart of the method according to the invention.
Embodiment
Carried out clearly below with reference to the technique effect of the design of embodiment and attached drawing to the present invention, concrete structure and generation Chu, complete description, to be completely understood by the purpose of the present invention, scheme and effect.It should be noted that in situation about not conflicting Under, the feature in embodiment and embodiment in the application can be mutually combined.
Fig. 1 show the main flow block diagram of the method for the present invention.The method according to the invention mainly includes coding and compression Two major parts.It is described in greater detail below by some embodiments.
1st, the three-dimensional model gridding data-encoding scheme based on agreement
Model file data are divided into three parts by this method：Model file head, grouping information, grid data (marshalling 1 ... Organize into groups N), as shown in Figure 2.
(1) model file head
Comprising format version number, marshalling number, whether enable AO passages, a grouping information the space occupied.Model head File specific coding mode is as follows：
VERSION：First 4 byte, storage model format version number
GROUP_COUNT：Second 4 byte, the number of storage model marshalling
HAS_AO：Whether the 3rd 4 bytes, storage model sit with the relevant textures of Ambient Occlusion Map Mark passage
GROUP_INFO_SIZE：4th 4 bytes, store the space size shared by a grouping information, to facilitate not To extend
(2) grouping information
It includes group names, packet vertex data initial position, normal data initial position, the texture coordinate start bit Put, AO passage texture coordinates initial position, vertex number, face number, a face data take byte.
Its grouping information is each organized into groups, for recording the position of marshalling title and marshals data storage within the data block, Its data structure is as follows：
NAME:20 bytes are taken, organize into groups noun for storing, therefore 20 bytes cannot be more than by organizing into groups title, otherwise can be cut It is disconnected
POSITION_BEGIN:4 bytes are taken, represent vertex data in the initial position of data block
NORMAL_BEGIN:4 bytes are taken, represent normal data in the initial position of data block
UV_BEGIN:4 bytes are taken, represent texture coordinate data in the initial position of data block
UV2_BEGIN:4 bytes are taken, represent the data of Ambient Occlusion Map texture coordinates in data block Initial position
FACE_BEGIN：4 bytes are taken, represent face data in the initial position of data block
POSITION_COUNT:4 bytes are taken, represent the quantity on the marshalling vertex
FACE_COUNT:4 bytes are taken, represent the quantity in the marshalling face
FACE_SIZE:4 bytes are taken, represent the byte number shared by the marshalling face data individual data, if marshalling institute The model data face number of expression is less than UINT16_MAX, and then FACE_SIZE is equal to 2, otherwise equal to 4.
(3) grid data
Vertex of this part including all packets, normal, texture coordinate, face data, and be indexed by grouping information.
2nd, three-dimensional model gridding data compression flow
In embodiment as shown in Figure 3, the method according to the invention includes the following steps.
Step S1：File format judgement is carried out to the model file of input, see whether for threedimensional model form (obj, Dae etc.) or whether according to above-described embodiment carried out coding.
Step S2：Current Model File parses.
The present invention parses Current Model File using assimp, obtain the vertex of model, normal, texture coordinate, The data such as face index, material information.
Step S3：Model face data conversion.
Whether judgment models face is triangle.Follow-up processing and storage for convenience, the present invention are unified by the four of model The face of side shape or the face of polygon are converted into gore.
Step S4：Normal data arranges.
The data such as vertex, normal, texture coordinate, face are stored in array, calculate data volume subsequently to use.
Step S5：Ambient light masking (Ambient Occlusion, AO) channel data arranges
Judge whether file carries ao texture coordinate passages, have then by the storage of AO texture coordinates related data into array.
Step S6：Write file header
By version number, marshals data, if enable the information such as AO passages, single grouping information occupied space write-in file.
Step S7：Write grouping information
Grouping information, which records, organizes into groups the storage location of relevant data within the data block, by recording each middle data Initial position and data amount check, to be taken out data from data block during resolution file.
Since being organized into groups first, the initial position of its vertex data is the sum of file header and grouping information occupied space, File header information occupied space is recorded as Hsize, marshalling number is denoted as Gcount, single grouping information length extremely Gsize, it is first A marshalling vertex data initial position is denoted as Pbegin, then：
Pbegin=Gcount×Gsize+Hsize
Vertex data number is the length of the packet vertex data array, is denoted as Pcount。
Due to each vertex data be one by x, y, z, the three-dimensional vector of composition, and be each worth and take 4 bytes, because This vertex data the space occupied is：
Psize=Pcount×3×4
The data start of normal is：
Nbegin=Pbegin+Pcount+Psize
The data amount check of normal is consistent with the data amount check of the data amount check on vertex and texture coordinate, in order to save Memory space, does not record the data amount check of normal, texture coordinate, unified to use Pcount。
Normal data is equally made of a three-dimensional vector, therefore the initial position of texture coordinate data is
Ubegin=Nbegin+Psize
Texture coordinate is a bivector composition, therefore the initial position of face data is
Fbegin=Ubegin+Pcount×2×4。
It should be noted that the number in face and vertex are inconsistent, its value is the array length of face data, is denoted as Fcount. In the present invention, the space occupied of face data is variable.Because each face data record be 3 vertex index, because The value in this face is in a limited space, when vertex data number is less than 215, i.e., the space of 2 bytes just represents all enough When face indexes, it is only necessary to the space of 2 bytes is distributed to each face data, therefore, opposite vertexes data is needed exist for and is judged, such as Fruit vertex data number is less than or equal to 215Then single face data occupied space is 2 bytes, and otherwise occupied space is 4 bytes.
The foregoing describe first marshalling associated information calculation method, and so on can calculate each marshalling Information.
Step S8：Write grid data
The data such as vertex, normal, texture coordinate, face are written to specific position according to position as defined in above-mentioned grouping information Put.
It should be appreciated that the embodiment of the present invention can be by computer hardware, the combination of hardware and software or by depositing The computer instruction in non-transitory computer-readable memory is stored up to be effected or carried out.The method can be compiled using standard Journey technology-realized including being configured with the non-transitory computer-readable storage media of computer program in computer program, its In so configured storage medium cause computer operated in a manner of specific and is predefined-according to describing in a particular embodiment Method and attached drawing.Each program can be realized to lead to computer system with the programming language of level process or object-oriented Letter.But, if desired, the program can be realized with compilation or machine language.Under any circumstance, the language can be compiling or The language of explanation.In addition, the program can be run on the application-specific integrated circuit of programming for this purpose.
Further, this method can be realized in suitable any kind of calculating platform is operably coupled to, including But it is not limited to PC, mini-computer, main frame, work station, network or distributed computing environment, single or integrated Computer platform or communicate with charged particle instrument or other imaging devices etc..Each aspect of the present invention can be with storage Machine readable code on non-transitory storage medium or equipment realizes, either moveable to be also integrated into calculating flat Platform, such as hard disk, optically read and/or write-in storage medium, RAM, ROM so that it can be read by programmable calculator, when depositing It can be used for configuring and operate computer to perform process described herein when storage media or equipment are read by computer.In addition, Machine readable code, or part thereof can be transmitted by wired or wireless network.Include with reference to microprocessor when such media or When other data processors realize instruction or the program of steps described above, it is different that invention as described herein includes these and other The non-transitory computer-readable storage media of type.When methods and techniques according to the present invention program, the present invention is also Including computer in itself.
Computer program can be applied to input data to perform function as described herein, so as to change input data with life Into storing to the output data of nonvolatile memory.Output information can also be applied to one or more output equipments as shown Device.In the preferred embodiment of the invention, the data of conversion represent physics and tangible object, including the thing produced on display Reason and the particular visual of physical objects are described.

Claims (10)

  1. A kind of 1. three-dimensional modeling data processing method based on protocol mode, it is characterised in that including：
    Coding step, model file data are encoded, and are divided into model file head, grouping information and grid data；
    Compression step, parses three-dimensional model gridding data, the model face data after parsing is converted to gore data, dynamic Arrangement standard geometric data and data texturing and invalid data is rejected, re-write grouping information and grid data.
  2. 2. the three-dimensional modeling data processing method according to claim 1 based on protocol mode, it is characterised in that described In coding step：
    Model file head includes format version number, marshalling number, whether enables ambient light masking passage, each grouping information occupancy Space；
    Grouping information includes group names, packet vertex data initial position, normal data initial position, texture coordinate start bit Put, ambient light covers passage texture coordinate initial position, vertex number, face number, each face data take byte number；
    Vertex of the grid data including all packets, normal, texture coordinate knead dough data, and rope is carried out by grouping information Draw.
  3. 3. the three-dimensional modeling data processing method according to claim 1 or 2 based on protocol mode, it is characterised in that institute State compression step to parse the model file of coding using threedimensional model reading storehouse instrument, obtain the grid number of model Storehouse instrument is read according to, the threedimensional model to increase income storehouse including Assimp.
  4. 4. the three-dimensional modeling data processing method according to claim 1 or 2 based on protocol mode, it is characterised in that institute Stating compression step includes：
    It is unified that the face of quadrangle of model or the face of polygon are converted into gore；
    The grid data of arrangement standard is simultaneously stored in array, then precalculates data volume；
    Judge that file whether with ambient light masking texture coordinate passage, has the correlation of ambient light masking passage texture coordinate then Data are stored into array.
  5. 5. the three-dimensional modeling data processing method according to claim 2 based on protocol mode, it is characterised in that described In compression step, write-in grouping information includes：
    Since being organized into groups first, by the sum that the initial position of vertex data is file header and grouping information occupied space, wherein File header information occupied space is recorded as Hsize, marshalling number is denoted as Gcount, single grouping information length is denoted as Gsize, it is first A marshalling vertex data initial position is denoted as Pbegin, then Pbegin=Gcount×Gsize+Hsize；
    Vertex data number is the length of the packet vertex data array, is denoted as Pcount；
    When each vertex data be one by x, y, z, the three-dimensional vector of composition, and be each worth and take 4 bytes, thus vertex Data the space occupied is Psize=Pcount×3×4；
    The data start of normal is Nbegin=Pbegin+Pcount+Psize；
    The data amount check of the data amount check of normal, the data amount check on vertex and texture coordinate is consistent, is unified for Pcount；
    Normal data is equally made of a three-dimensional vector, and the initial position of texture coordinate data is Ubegin=Nbegin+Psize；
    Texture coordinate is a bivector composition, then the initial position of face data is Fbegin=Ubegin+Pcount×2×4；
    Grouping information is write one by one, until all marshalling write-in new files.
  6. 6. the three-dimensional modeling data processing method according to claim 5 based on protocol mode, it is characterised in that the pressure Contracting step further comprises：
    The byte number shared by the data of face is dynamically changed when arranging grid data；
    For the index on each three vertex of face data record definition；
    When vertex data number is less than 215, when the space of two bytes just represents all face indexes enough, to each face data point Space with two bytes；Otherwise the space of nybble is distributed.
  7. A kind of 7. three-dimensional modeling data processing unit based on protocol mode, it is characterised in that including：
    Coding module, for model file data to be encoded, is divided into model file head, grouping information and grid data；
    Model face data after parsing for parsing three-dimensional model gridding data, are converted to gore data by compression module, Dynamic arranges standard geometric data and data texturing and rejects invalid data, re-writes grouping information and grid data.
  8. 8. the three-dimensional modeling data processing unit according to claim 7 based on protocol mode, it is characterised in that the pressure Contracting module includes：
    First submodule, gore is converted into for unified by the face of quadrangle of model or the face of polygon；
    Second submodule, for arranging the grid data of standard and being stored in array, then precalculates data volume；
    3rd submodule, for judging that file whether with ambient light masking texture coordinate passage, has then to cover ambient light and leads to The related data of road texture coordinate is stored into array.
  9. A kind of 9. three-dimensional modeling data processing unit based on protocol mode, it is characterised in that including：Memory, its storage refer to Order；Processor, for performing described instruction to realize method any one of claim 1-6.
  10. 10. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the program is by processor Method any one of claim 1-6 is realized during execution.
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CN112162957B (en) * 2020-10-13 2022-05-27 中国空气动力研究与发展中心计算空气动力研究所 Multi-block structure grid data compression storage method, decompression method and device
CN114693817A (en) * 2022-04-13 2022-07-01 广州柏视医疗科技有限公司 Compression and decompression method of 3D grid model

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