CN110866965A - Mapping drawing method and device for three-dimensional model - Google Patents
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Abstract
The specification provides a mapping drawing method and a mapping drawing device for a three-dimensional model, wherein the method comprises the following steps: rasterizing a target mapping model according to preset grids to obtain a grid set corresponding to the target mapping model; extracting a plurality of grids to be processed containing the image content of the target chartlet model from the grid set; calculating position information data of each grid to be processed in the plurality of grids to be processed; and reading the color information data of each grid to be processed in the plurality of grids to be processed, and storing the color information data of each grid to be processed and the corresponding position information data so as to draw the three-dimensional model by each grid to be processed.
Description
Technical Field
The present disclosure relates to the field of internet technologies, and in particular, to a method and an apparatus for mapping a three-dimensional model, a computing device, and a computer-readable storage medium.
Background
In the three-dimensional graphic rendering and mapping process in the prior art, basically, the graphics and mapping areas of the mapping are directly aligned, overlaid and pasted, generally, the mapping and the corresponding mapping areas are both rectangular, and at this time, four vertices of the mapping are aligned with the corresponding vertices of the mapping areas and pasted. However, in the mapping method in the prior art, all data information contained in the mapping needs to be completely read and stored, and data reading and storage are also needed for a large amount of blank areas of the mapping which have no practical significance in mapping, so that large memory consumption is brought to the system, and the program running speed is reduced.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method, an apparatus, a computing device, and a computer-readable storage medium for mapping a three-dimensional model, so as to solve technical defects in the prior art.
According to a first aspect of embodiments of the present specification, there is provided a mapping method for a three-dimensional model, including:
rasterizing a target mapping model according to preset grids to obtain a grid set corresponding to the target mapping model;
extracting a plurality of grids to be processed containing the image content of the target chartlet model from the grid set;
calculating position information data of each grid to be processed in the plurality of grids to be processed;
and reading the color information data of each grid to be processed in the plurality of grids to be processed, and storing the color information data of each grid to be processed and the corresponding position information data so as to draw the three-dimensional model by each grid to be processed.
According to a second aspect of embodiments herein, there is provided a mapping apparatus for a three-dimensional model, including:
the rasterization module is configured to perform rasterization processing on a target map model according to preset grids to obtain a grid set corresponding to the target map model;
a grid extraction module configured to extract a plurality of grids to be processed including image content of the target chartlet model from the grid set;
a data calculation module configured to calculate position information data of each of the plurality of to-be-processed grids;
the data storage module is configured to read the color information data of each to-be-processed grid in the plurality of to-be-processed grids, and store the color information data of each to-be-processed grid and the corresponding position information data, so that each to-be-processed grid draws a three-dimensional model.
According to a third aspect of embodiments herein, there is provided a computing device comprising a memory, a processor and computer instructions stored on the memory and executable on the processor, the processor implementing the steps of the method for mapping a three-dimensional model when executing the instructions.
According to a fourth aspect of embodiments herein, there is provided a computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the method for mapping a three-dimensional model.
According to the method and the device, the target map is subjected to rasterization, each grid with non-blank content is extracted to serve as the grid to be processed, blank areas possibly existing in the map are eliminated, and the position information data and the color information data of each grid to be processed are calculated and stored, so that the system only needs to read and store the relevant data of the grid to be processed in the non-blank areas during rendering, all data of the target map do not need to be read and stored, and a large amount of data storage space and data processing and calculation cost are saved.
Drawings
FIG. 1 is a block diagram of a computing device provided by an embodiment of the present application;
FIG. 2 is a flowchart of a mapping method for a three-dimensional model according to an embodiment of the present disclosure;
FIG. 3 is another flowchart of a mapping method for a three-dimensional model according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a mapping method for a three-dimensional model according to an embodiment of the present disclosure;
FIG. 5 is another flowchart of a mapping method for a three-dimensional model according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a mapping device for a three-dimensional model according to an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The terminology used in the description of the one or more embodiments is for the purpose of describing the particular embodiments only and is not intended to be limiting of the description of the one or more embodiments. As used in one or more embodiments of the present specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, etc. may be used herein in one or more embodiments to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first can also be referred to as a second and, similarly, a second can also be referred to as a first without departing from the scope of one or more embodiments of the present description. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
First, the noun terms to which one or more embodiments of the present invention relate are explained.
Color channel: in a three-dimensional model, each image has one or more color channels, and the default number of color channels in an image depends on its color mode, i.e., the color mode of an image will determine the number of color channels.
RGB channel: each pixel point is represented by 3 color channel values, the RGB color model is a color standard in the industry, and various colors are obtained by changing three color channels of Red (Red), Green (Green), and Blue (Blue) and superimposing the three color channels, RGB represents colors of the three channels of Red, Green, and Blue, and the standard almost includes all colors that can be perceived by human vision, and is one of the most widely used color systems at present.
RGBA channel: RGBA is a color space representing Red (Red), Green (Green), Blue (Blue), and Alpha. Although it is sometimes described as a color space, it is actually just the RGB model with the additional information added, and the Alpha channel is typically used as a transparency parameter. If a pixel has an Alpha channel value of 0, it is completely blank, i.e., transparent and invisible, and a value of 100 means a completely opaque pixel.
Vertex coordinates: the geometric coordinates of the four vertices of the map in the OpenGL coordinate system.
UV coordinates: when the texture mapping scene is drawn, all the mapping files are two-dimensional planes, the horizontal direction is U, the vertical direction is V, and any pixel on the image can be positioned through the two-dimensional UV coordinate system of the planes.
In the present application, a method, an apparatus, a computing device and a computer readable storage medium for mapping a three-dimensional model are provided, which are described in detail in the following embodiments one by one.
FIG. 1 shows a block diagram of a computing device 100, according to an embodiment of the present description. The components of the computing device 100 include, but are not limited to, memory 110 and processor 120. The processor 120 is coupled to the memory 110 via a bus 130 and a database 150 is used to store data.
Computing device 100 also includes access device 140, access device 140 enabling computing device 100 to communicate via one or more networks 160. Examples of such networks include the Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the internet. Access device 140 may include one or more of any type of network interface (e.g., a Network Interface Card (NIC)) whether wired or wireless, such as an IEEE802.11 Wireless Local Area Network (WLAN) wireless interface, a worldwide interoperability for microwave access (Wi-MAX) interface, an ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a bluetooth interface, a Near Field Communication (NFC) interface, and so forth.
In one embodiment of the present description, the above-described components of computing device 100 and other components not shown in FIG. 1 may also be connected to each other, such as by a bus. It should be understood that the block diagram of the computing device architecture shown in FIG. 1 is for purposes of example only and is not limiting as to the scope of the description. Those skilled in the art may add or replace other components as desired.
Computing device 100 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., tablet, personal digital assistant, laptop, notebook, netbook, etc.), a mobile phone (e.g., smartphone), a wearable computing device (e.g., smartwatch, smartglasses, etc.), or other type of mobile device, or a stationary computing device such as a desktop computer or PC. Computing device 100 may also be a mobile or stationary server.
Wherein the processor 120 may perform the steps of the method shown in fig. 2. Fig. 2 is a schematic flow chart diagram illustrating a mapping method of a three-dimensional model according to an embodiment of the present application, including steps 202 to 208.
Step 202: and rasterizing the target mapping model according to preset grids to obtain a grid set corresponding to the target mapping model.
In the embodiment of the application, a system firstly obtains a three-dimensional model and a target map which need to be rendered, then performs rasterization processing on the target map model according to preset grids, divides the whole target map into a plurality of grids, and obtains a grid set corresponding to the target map model.
Step 204: and extracting a plurality of grids to be processed containing the image content of the target chartlet model from the grid set.
In the embodiment of the application, the system divides the grids in the grid set into two types, wherein one type is a completely blank grid with all blank grid contents, and the other type is a non-blank grid with the image contents of the target chartlet model, and the non-blank grid is extracted to be used as the grid to be processed so as to form the target chartlet only by the non-blank grid.
Step 206: and calculating the position information data of each grid to be processed in the plurality of grids to be processed.
In the embodiment of the application, after the system acquires the multiple to-be-processed grids, the system calculates the position information data of each to-be-processed grid in the multiple to-be-processed grids, so as to obtain the position of each to-be-processed grid mapped on the three-dimensional model.
Optionally, in the above embodiment, the calculating the position information data of each of the multiple to-be-processed grids includes:
and respectively calculating the vertex coordinates and the UV coordinates of the four vertexes of each grid to be processed in the coordinate system of the three-dimensional model. Wherein the UV coordinates are used to map points on the three-dimensional model surface with points on the target mapping plane.
Step 208: and reading the color information data of each grid to be processed in the plurality of grids to be processed, and storing the color information data of each grid to be processed and the corresponding position information data so as to draw the three-dimensional model by each grid to be processed.
In the embodiment of the application, the system further reads the color information data of each to-be-processed grid in the plurality of to-be-processed grids, and stores the color information data of each to-be-processed grid and the corresponding position information data, so that the system can cover each to-be-processed grid on the surface of the three-dimensional model when the system performs three-dimensional model rendering.
According to the method and the device, the target map is subjected to rasterization, each grid with non-blank content is extracted to serve as the grid to be processed, blank areas possibly existing in the map are eliminated, and the position information data and the color information data of each grid to be processed are calculated and stored, so that the system only needs to read and store the relevant data of the grid to be processed in the non-blank areas during rendering, all data of the target map do not need to be read and stored, and a large amount of data storage space and data processing and calculation cost are saved.
In an embodiment of the present application, as shown in fig. 3, the rasterizing the target map model according to the preset mesh to obtain a grid set corresponding to the target map model includes steps 302 to 304:
step 302: and determining the number of the grids according to the image content of the target map model.
In the embodiment of the present application, as shown in fig. 4, after the system acquires the target map, the system determines the number of the grids according to the image of the target map model through self judgment of the system or request of the user, the number and size of the grids depend on the distribution of the blank areas in the target map, and since the blank areas are invisible, for the convenience of understanding of those skilled in the art, it is assumed that the "blank areas" of the edge of the target map shown in fig. 4 are the blank areas, that is, the system performs relatively complete division on the "blank areas" of the edge of the target map and the image content of the target map by trying different numbers and sizes of grids.
Step 304: and segmenting the target mapping model according to the resolution of the grid to form the grid set.
In the embodiment of the present application, after the system determines the number of the meshes, the system segments the target map model according to the resolution of the meshes to form the grid set, as shown in fig. 4, and after the system determines that the number of the meshes is 64, the system segments the target map model according to the resolution of 8 × 8 to form the grid set including 64 grids.
The target map is subjected to rasterization processing according to the resolution of the preset grid to obtain a grid set, and the target map can be simply and reasonably divided so as to be convenient for later extraction and optimization.
In another embodiment of the present application, as shown in fig. 5, the extracting multiple to-be-processed grids including the image content of the target map model from the grid set includes steps 502 to 506:
step 502: judging whether the image content of each grid to be processed in the grid set is completely blank; if yes, go to step 504; if not, go to step 506.
Step 504: discarding the grid to be processed.
Step 506: and reserving and extracting the grid to be processed.
In an embodiment of the present application, a system discards or retains each to-be-processed grid in a grid set by determining whether image content of each to-be-processed grid in the grid set is completely blank, so as to obtain a plurality of to-be-processed grids including image content of the target chartlet model, where the determining whether image content of each pixel grid in the grid set is completely blank includes:
and judging whether the numerical values of the RGB channels of each pixel in each grid to be processed in the grid set are all (0, 0, 0), or judging whether the numerical values of the Alpha channels in the RGBA channels of each pixel in each grid to be processed in the grid set are all 0.
In the embodiment of the application, when the target map is in an RGB format, the system determines whether all of the RGB channel values of each pixel in each grid to be processed in the grid set are (0, 0, 0), if so, it indicates that the grid to be processed is a completely black blank grid, and if not, it indicates that the grid to be processed is a non-blank grid having a specific color including white; under the condition that the target map is in an RGBA format, the system judges whether all numerical values of Alpha channels in RGBA channels of each pixel in each grid to be processed in the grid set are 0, if so, the grid to be processed is a completely black blank grid, and if not, the grid to be processed is a non-blank grid with specific colors including white.
Optionally, in the above embodiment, the reading the color information data of each of the multiple to-be-processed grids includes:
reading the value of each channel in the RGB channel of each pixel in each grid to be processed, or reading the value of each channel in the RGBA channel of each pixel in each grid to be processed.
According to different picture formats, the method and the device determine whether the grid to be processed is a blank grid or a non-blank grid with chartlet content by judging the numerical value of the corresponding color channel of each pixel in each grid to be processed, the accuracy is high, the reliability is good, and misjudgment caused by special conditions can be avoided.
Corresponding to the above method embodiment, the present specification further provides an embodiment of a mapping device for a three-dimensional model, and fig. 6 shows a schematic structural diagram of the mapping device for a three-dimensional model according to an embodiment of the present specification. As shown in fig. 6, the apparatus includes:
the rasterizing module 601 is configured to perform rasterization processing on a target map model according to preset grids to obtain a grid set corresponding to the target map model;
a grid extraction module 602 configured to extract a plurality of grids to be processed including image content of the target map model from the grid set;
a data calculation module 603 configured to calculate position information data of each of the plurality of grids to be processed;
a data storage module 604, configured to read the color information data of each of the multiple to-be-processed grids, and store the color information data of each of the to-be-processed grids and the corresponding position information data, so that each of the to-be-processed grids draws a three-dimensional model.
Optionally, the rasterizing module 601 includes:
a mesh determination unit configured to determine the number of meshes from image content of the target map model;
and the grid segmentation unit is configured to segment the target map model according to the resolution of the grid to form the grid set.
Optionally, the grid extracting module 602 includes:
the grid screening unit is configured to judge whether the image content of each grid to be processed in the grid set is completely blank; if yes, executing a discarding unit; if not, executing a reservation unit;
the discarding unit is configured to discard the grid to be processed;
the reserving unit is configured to reserve and extract the grid to be processed.
Optionally, the grid screening unit includes:
and the color channel unit is configured to judge whether the numerical values of the RGB channels of each pixel in each grid to be processed in the grid set are all (0, 0, 0) or judge whether the numerical values of the Alpha channels in the RGBA channels of each pixel in each grid to be processed in the grid set are all 0.
Optionally, the data calculation module 603 includes:
a coordinate calculation unit configured to calculate vertex coordinates and UV coordinates of four vertices of each of the grids to be processed, respectively.
Optionally, the data storage module 604 includes:
a data reading unit configured to read a numerical value of each of RGB channels of each pixel in each of the to-be-processed grids, or read a numerical value of each of RGBA channels of each pixel in each of the to-be-processed grids.
According to the method and the device, the target map is subjected to rasterization, each grid with non-blank content is extracted to serve as the grid to be processed, blank areas possibly existing in the map are eliminated, and the position information data and the color information data of each grid to be processed are calculated and stored, so that the system only needs to read and store the relevant data of the grid to be processed in the non-blank areas during rendering, all data of the target map do not need to be read and stored, and a large amount of data storage space and data processing and calculation cost are saved.
An embodiment of the present application further provides a computing device, including a memory, a processor, and computer instructions stored on the memory and executable on the processor, where the processor executes the instructions to implement the following steps:
rasterizing a target mapping model according to preset grids to obtain a grid set corresponding to the target mapping model;
extracting a plurality of grids to be processed containing the image content of the target chartlet model from the grid set;
calculating position information data of each grid to be processed in the plurality of grids to be processed;
and reading the color information data of each grid to be processed in the plurality of grids to be processed, and storing the color information data of each grid to be processed and the corresponding position information data so as to draw the three-dimensional model by each grid to be processed.
An embodiment of the present application further provides a computer readable storage medium, which stores computer instructions, and the instructions, when executed by a processor, implement the steps of the mapping method for three-dimensional models as described above.
The above is an illustrative scheme of a computer-readable storage medium of the present embodiment. It should be noted that the technical solution of the computer-readable storage medium and the technical solution of the mapping method for three-dimensional models described above belong to the same concept, and details that are not described in detail in the technical solution of the computer-readable storage medium can be referred to the description of the technical solution of the mapping method for three-dimensional models described above.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The computer instructions comprise computer program code which may be in the form of source code, object code, an executable file or some intermediate form, or the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The preferred embodiments of the present application disclosed above are intended only to aid in the explanation of the application. Alternative embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.
Claims (14)
1. A method for mapping a three-dimensional model is characterized by comprising the following steps:
rasterizing a target mapping model according to preset grids to obtain a grid set corresponding to the target mapping model;
extracting a plurality of grids to be processed containing the image content of the target chartlet model from the grid set;
calculating position information data of each grid to be processed in the plurality of grids to be processed;
and reading the color information data of each grid to be processed in the plurality of grids to be processed, and storing the color information data of each grid to be processed and the corresponding position information data so as to draw the three-dimensional model by each grid to be processed.
2. The method according to claim 1, wherein the rasterizing the target map model according to the preset mesh to obtain the grid set corresponding to the target map model comprises:
determining the number of the grids according to the image content of the target map model;
and segmenting the target mapping model according to the resolution of the grid to form the grid set.
3. The method of claim 2, wherein the extracting the plurality of grids to be processed including the image content of the target map model from the grid set comprises:
judging whether the image content of each grid to be processed in the grid set is completely blank;
if so, discarding the grid to be processed;
if not, reserving and extracting the grid to be processed.
4. The method of claim 3, wherein determining whether the image content of each pixel grid in the grid set is completely blank comprises:
and judging whether the numerical values of the RGB channels of each pixel in each grid to be processed in the grid set are all (0, 0, 0), or judging whether the numerical values of the Alpha channels in the RGBA channels of each pixel in each grid to be processed in the grid set are all 0.
5. The method of claim 1, wherein the calculating the location information data for each of the plurality of grids to be processed comprises:
and respectively calculating the vertex coordinates and the UV coordinates of the four vertexes of each grid to be processed.
6. The method of claim 4, wherein the reading the color information data of each of the plurality of grids to be processed comprises:
reading the value of each channel in the RGB channel of each pixel in each grid to be processed, or reading the value of each channel in the RGBA channel of each pixel in each grid to be processed.
7. An apparatus for mapping a three-dimensional model, comprising:
the rasterization module is configured to perform rasterization processing on a target map model according to preset grids to obtain a grid set corresponding to the target map model;
a grid extraction module configured to extract a plurality of grids to be processed including image content of the target chartlet model from the grid set;
a data calculation module configured to calculate position information data of each of the plurality of to-be-processed grids;
the data storage module is configured to read the color information data of each to-be-processed grid in the plurality of to-be-processed grids, and store the color information data of each to-be-processed grid and the corresponding position information data, so that each to-be-processed grid draws a three-dimensional model.
8. The apparatus of claim 7, wherein the rasterization module comprises:
a mesh determination unit configured to determine the number of meshes from image content of the target map model;
and the grid segmentation unit is configured to segment the target map model according to the resolution of the grid to form the grid set.
9. The apparatus of claim 8, wherein the grid extraction module comprises:
the grid screening unit is configured to judge whether the image content of each grid to be processed in the grid set is completely blank; if yes, executing a discarding unit; if not, executing a reservation unit;
the discarding unit is configured to discard the grid to be processed;
the reserving unit is configured to reserve and extract the grid to be processed.
10. The apparatus of claim 9, wherein the grid screening unit comprises:
and the color channel unit is configured to judge whether the numerical values of the RGB channels of each pixel in each grid to be processed in the grid set are all (0, 0, 0) or judge whether the numerical values of the Alpha channels in the RGBA channels of each pixel in each grid to be processed in the grid set are all 0.
11. The apparatus of claim 7, wherein the data computation module comprises:
a coordinate calculation unit configured to calculate vertex coordinates and UV coordinates of four vertices of each of the grids to be processed, respectively.
12. The apparatus of claim 10, wherein the data storage module comprises:
a data reading unit configured to read a numerical value of each of RGB channels of each pixel in each of the to-be-processed grids, or read a numerical value of each of RGBA channels of each pixel in each of the to-be-processed grids.
13. A computing device comprising a memory, a processor, and computer instructions stored on the memory and executable on the processor, wherein the processor implements the steps of the method of any one of claims 1-6 when executing the instructions.
14. A computer-readable storage medium storing computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 6.
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