CN112365584B - Method for generating printing effect on three-dimensional clothing model - Google Patents
Method for generating printing effect on three-dimensional clothing model Download PDFInfo
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- CN112365584B CN112365584B CN202011321200.9A CN202011321200A CN112365584B CN 112365584 B CN112365584 B CN 112365584B CN 202011321200 A CN202011321200 A CN 202011321200A CN 112365584 B CN112365584 B CN 112365584B
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- 238000007639 printing Methods 0.000 claims abstract description 129
- 230000000694 effects Effects 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000009877 rendering Methods 0.000 claims abstract description 12
- 238000013507 mapping Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000007645 offset printing Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000004744 fabric Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007641 inkjet printing Methods 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000003854 Surface Print Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/005—General purpose rendering architectures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T19/00—Manipulating 3D models or images for computer graphics
- G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2210/00—Indexing scheme for image generation or computer graphics
- G06T2210/16—Cloth
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- Computer Graphics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Software Systems (AREA)
- Architecture (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Printing Methods (AREA)
Abstract
The invention discloses a method for generating a printing effect on a three-dimensional clothing model, which comprises the following steps: importing a three-dimensional clothing model and rendering in real time; reading user input, and positioning one point on the surface of the three-dimensional clothing model as a printing target position; acquiring the normal direction, UV coordinates and sheet information of the printing target position; calculating the corresponding relation between the size of the three-dimensional clothing model and the UV coordinates to obtain a UV coordinate range corresponding to the printing size; traversing grid vertexes of the same plate with the printing target position, and screening vertex data with UV coordinates in a printing UV coordinate range; copying the vertex data to obtain a printing model, and outwards shifting the printing model along the normal direction of the printing target position; and calculating UV coordinates of the printing model, and mapping the printing pattern onto the three-dimensional clothing model to obtain the effect of sheet printing. The invention simulates based on UV coordinates and plate information, and realizes the effect of generating real plate printing in the three-dimensional clothing model.
Description
Technical Field
The invention relates to the field of three-dimensional clothing design, in particular to a method for generating a printing effect on a three-dimensional clothing model.
Background
The computer aided clothing design for the beginning development of the 70 th century simplifies the steps of clothing design, sample discharging, stacking, discharging and the like, and makes the computer board making become the main stream means. With the improvement of the hardware performance of the computer and the development of the software technology, the computer can assist the two-dimensional clothing to make a board, and can also perform virtual sewing on the board through simulation to generate a three-dimensional clothing model, thereby more intuitively meeting the requirements of clothing design.
The three-dimensional clothing model makes the trend of clothing design three-dimensional. A designer or consumer who does not know the knowledge of the panels and does not have the skills of typing can also design the garment through an intuitive three-dimensional model, for example, by replacing the model map to observe the effects of different fabrics, replacing the part model to achieve the combined effects of the garment of different sleeves, pockets, collars, etc. And a real garment printing effect is generated on the three-dimensional garment model, which is also a difficult problem in three-dimensional garment design.
The printing technology of the three-dimensional clothing model at the present stage mostly adopts a projection method which is effective for all types of three-dimensional grid models. Although there are two different ideas of delayed rendering direct rendering and forward rendering generating models in the implementation of the method, the essence is to use one projection box to determine the printed rendering area. A good printing effect can be obtained for a flat model surface, but the folds of the garment model surface deform the printing effect, and the depth of the projection box is difficult to determine. If the projection box is too deep, the upper layer or the lower layer model of the target surface is printed, if the projection box is too shallow, the printing is incomplete due to uneven clothing surface.
The three-dimensional clothing model regenerated after printing on the plate sheet has the principle similar to the real printing manufacturing process and also has the real printing effect. However, for the three-dimensional garment model which is generated, no related technology can generate a real garment printing effect on the surface of the model at present.
The specification with the publication number of CN 110801068A discloses a manufacturing method of ink-jet printing clothes, which comprises the following steps: establishing a layout; making a clothing model according to the layout; establishing a curved surface coordinate grid on the clothing model; projecting the printed pattern onto the garment model in a parallel light source orthographic projection mode, wherein part of the printed pattern is distributed at the butt-joint sewing position of the garment model; positioning the printed pattern according to the curved surface coordinate grid to obtain a plurality of curved surface positioning data; establishing a printed pattern plane design diagram according to the curved surface positioning data; carrying out an inkjet printing process on the cloth according to the printed pattern plane design drawing, and then carrying out a cutting process to obtain a plurality of printed pattern cut pieces; and manufacturing the printed pattern cut pieces into finished products of the clothing. The main purpose of the invention is to enable the ink-jet printing to achieve good patterning effect at the butt-joint sewing position, rather than generating a real printing effect on a three-dimensional clothing model.
Disclosure of Invention
The invention aims to provide a method for generating a printing effect on a three-dimensional clothing model, which realizes the effect of obtaining a real plate printing effect on the three-dimensional clothing model.
A method of creating a printing effect on a three-dimensional garment model, comprising the steps of:
(1) Importing a three-dimensional clothing model and rendering in real time;
(2) Reading user input, and positioning one point on the surface of the three-dimensional clothing model as a printing target position;
(3) Acquiring the normal direction, UV coordinates and sheet information of the printing target position;
(4) Calculating the corresponding relation between the size of the three-dimensional clothing model and the UV coordinates to obtain a UV coordinate range corresponding to the printing size;
(5) Traversing grid vertexes of the same plate with the printing target position, and screening vertex data with UV coordinates in a printing UV coordinate range;
(6) Copying the vertex data obtained in the step (5) to obtain a printing model, and outwards shifting the printing model along the normal direction of the printing target position to enable the printing model to be rendered on the surface of the three-dimensional clothing model;
(7) And calculating the UV coordinates of the offset printing model, and mapping the printing pattern onto the three-dimensional clothing model to obtain the plate printing effect.
The invention utilizes the characteristics of the three-dimensional clothing model to obtain the real clothing printing effect: the three-dimensional garment model requires texture mapping to reveal the fabric, so the three-dimensional garment model includes UV coordinates; the models belonging to the same plate are made of the same fabric, and the same material is used for rendering, so that the UV coordinate continuity is realized; and 3, virtually sewing by panel simulation software to obtain a three-dimensional clothing model, wherein the model grid of the three-dimensional clothing model is provided with panel information.
In step (1), the three-dimensional garment model is imported to include a model mesh and vertex data located in the model mesh, the vertex data including UV coordinates and slab information.
And rendering the imported three-dimensional clothing model in real time to meet the real-time interaction requirement of a user and displaying the printing effect generated in the subsequent step in real time.
Preferably, in the step (2), the user input means that the user clicks a positioning point where the print is required to be designed on the surface of the three-dimensional clothing model on the screen by using a mouse.
In the step (2), the print target position is obtained by generating a ray which starts from a camera and passes through the positioning point according to the screen coordinates returned by the mouse click event, and intersecting the ray with the triangular mesh of the three-dimensional clothing model to obtain the intersected triangle closest to the camera as the print target position of the print.
In the step (3), the method for obtaining the normal direction, the UV coordinates and the plate information of the printing target position comprises the following steps:
Firstly, acquiring a triangle where the printing target position is located and three vertexes forming the triangle; because the triangle of each plate has no connectivity in the model manufacture, one triangle does not belong to two plates at the same time, the plate information of the first vertex of the triangle is read as the plate information of the printing target position; and finally, carrying out interpolation calculation on the UV coordinates of the three vertexes of the triangle where the printing target position is located and the normal direction to obtain the UV coordinates of the printing target position.
Preferably, the interpolation calculation of the UV coordinates uses the following formula:
Wherein o is the print target position; a. b and c are three vertexes of a triangle where the printing target position is located, and d is the midpoint of the bc side; the od is the distance between the o and d points; v o is the UV coordinates of the o-point.
The principle and formula of the interpolation calculation of the normal direction and the interpolation calculation of the UV coordinates are the same.
Preferably, the three-dimensional garment model and the printed pattern are both practical in size and have a length in millimeters.
In the step (4), the calculation of the printing UV coordinate range comprises the following steps: calculating the space distance between three vertexes of the printing target position and the distance of UV coordinates between the three vertexes; respectively calculating the ratio of the UV coordinate distance to the space distance, and taking the average value of the three ratios as the corresponding relation between the size of the three-dimensional clothing model and the UV coordinate; and finally multiplying the UV coordinate range by the size of the printing to obtain the UV coordinate range of the printing. The printing effect is generated on the plate where the printing target position is located, so that the UV coordinates of the model grids to be screened are guaranteed to be continuously unified, and the method meets the production practice.
In the step (6), the printing model is outwards shifted along the normal direction of the printing target position. The offset distance is sufficient to enable the printing model to be correctly rendered on the three-dimensional garment model, and to avoid penetration.
In step (7), said mapping of the printed pattern to said three-dimensional garment model comprises the steps of: the offset UV coordinate ranges of the printing are normalized and mapped between [0,1], and assuming that the UV coordinate ranges of the printing are [ alpha, b ], the UV coordinate with the value P is mapped asCalculating to obtain UV coordinates P new after printing size correction; and performing texture mapping on the three-dimensional clothing model by using the pattern to be printed, and rendering the effect of plate printing.
Compared with the prior art, the invention has the main advantages that:
(1) Based on the UV coordinates of the three-dimensional clothing model and the plate information, the effect of generating real and attractive plate printing on the three-dimensional clothing model is realized for the first time;
(2) The method provided by the invention is visual and simple to realize; the time complexity of the algorithm is O (n) relative to the model grid number n, and the method has expandability.
Drawings
FIG. 1 is a flow chart of a method for creating a printing effect on a three-dimensional garment model according to an embodiment of the present invention;
FIG. 2 is a schematic view of the three-dimensional model imported by the user in S1 shown in FIG. 1;
FIG. 3 is a schematic illustration of a user-specified print pattern according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the printing effect generated in S7 shown in FIG. 1;
Fig. 5 is a schematic diagram showing a close-up view of the printing effect generated in S7 shown in fig. 1.
Detailed Description
As shown in fig. 1, a method for generating a printing effect on a three-dimensional garment model includes the steps of:
s1, importing a three-dimensional clothing model and rendering on a screen in real time;
S2, reading user input, and positioning one point on the surface of the three-dimensional clothing model as a printing target position of printing; s3, acquiring the normal direction, UV coordinates and sheet information of the printing target position;
S4, calculating the corresponding relation between the size of the three-dimensional clothing model and the UV coordinates to obtain a UV coordinate range corresponding to the printing size;
s5, traversing grid vertexes of the same plate with the printing target position, and screening vertex data with UV coordinates in a printing UV coordinate range;
S6, copying the vertex data obtained in the step S5 to obtain a printing model, and outwards shifting the printing model along the normal direction of the printing target position;
and S7, calculating the UV coordinates of the offset printing model, and mapping the printing pattern onto the three-dimensional clothing model to obtain the plate printing effect.
The following description will be made by taking printing at the right rear shoulder of the three-dimensional sanitary model as an example:
Step S1 is performed to import a three-dimensional sweater model as shown in fig. 2, which includes a model mesh and vertex data located in the model mesh, the vertex data including UV coordinates and slab information, and the UV coordinates being in millimeters, into the system. The system renders the sanitary wear model on a computer screen in real time.
Step S2 is performed, the user observes the model to confirm the positioning point of the surface print of the garment, in this embodiment the right back shoulder of the sanitary garment, as shown in FIG. 4.
And clicking the positioning point by using a mouse, generating a ray which is sent out by a camera and passes through the positioning point by using screen coordinates returned by a mouse clicking event, calculating the intersection point of the ray and the triangle mesh of the three-dimensional clothing model, which is closest to the camera, and obtaining the intersected triangle closest to the camera as the printing target position of the printing.
Step S3, firstly, obtaining a triangle where the printing target position obtained in the step S2 is located and three vertexes forming the triangle; because the triangle of each plate has no connectivity in the model manufacture, one triangle does not belong to two plates at the same time, the plate information of the first vertex of the triangle is read as the plate information of the printing target position; and finally, carrying out interpolation calculation on the UV coordinates of the three vertexes of the triangle where the printing target position is located and the normal direction to obtain the UV coordinates of the printing target position.
The interpolation calculation adopts the following formula:
Wherein o is the print target position; a. b and c are three vertexes of a triangle where the printing target position is located, and d is the midpoint of the bc side; the od is the distance between the o and d points; v o is the UV coordinates of the o-point.
The principle and formula of the interpolation calculation of the normal direction and the interpolation calculation of the UV coordinates are the same.
Step S4, calculating the space distance between three vertexes of the triangle and the distance of UV coordinates between the three vertexes; respectively calculating the ratio of the UV coordinate distance to the space distance, and taking the average of the three ratios as the corresponding relation between the model size and the UV coordinate; and finally multiplying the UV coordinate range by the size of the printing to obtain the UV coordinate range of the printing. The printing effect is generated on the plate where the printing target position is located, so that the UV coordinates of the grid to be screened are guaranteed to be continuously unified, and the printing target position meets the production practice.
And S5, traversing the grid data of the same plate with the printing target position, and screening out grid vertexes with UV coordinates in the printing UV range obtained in the step S4.
And S6, copying the screened vertexes to form a printing model. In order to properly render the printing model over the garment model while avoiding penetration, the printing model is offset outwardly by 0.001mm along the normal direction at the printing target location.
Step S7 is performed to map the printed pattern to the three-dimensional clothing model, and the method comprises the following steps: the UV coordinate range of the offset printing is normalized and mapped between [0,1] so as to carry out texture mapping on the printing model; assuming the UV coordinate range of the print is [ alpha, b ], the UV coordinate of value P should be mapped asCalculating to obtain UV coordinates P new after printing size correction; the three-dimensional clothing model is subjected to texture mapping by the pictures shown in fig. 3, and printing effects are rendered in real time, so that the plate printing effects on the model are as shown in fig. 4 and 5, and the effects are attractive and natural.
Claims (7)
1. A method of creating a printing effect on a three-dimensional garment model, comprising the steps of:
(1) Importing a three-dimensional clothing model and rendering in real time; the three-dimensional clothing model is imported and comprises model grids and vertex data located in the model grids, wherein the model grids are triangular grids, and the vertex data comprise UV coordinates and plate information;
(2) Reading user input, and positioning one point on the surface of the three-dimensional clothing model as a printing target position;
(3) Acquiring a triangle where the printing target position is located and three vertexes forming the triangle, and acquiring the normal direction, UV coordinates and sheet information of the printing target position;
(4) Calculating the corresponding relation between the size of the three-dimensional clothing model and the UV coordinates to obtain a UV coordinate range corresponding to the printing size, wherein the method comprises the following steps: calculating the space distance between three vertexes of the printing target position and the distance of UV coordinates between the three vertexes; respectively calculating the ratio of the UV coordinate distance to the space distance, and taking the average value of the three ratios as the corresponding relation between the size of the three-dimensional clothing model and the UV coordinate; finally multiplying the printing size to obtain a printing UV coordinate range;
(5) Traversing grid vertexes of the same plate with the printing target position, and screening vertex data with UV coordinates in a printing UV coordinate range;
(6) Copying the vertex data obtained in the step (5) to obtain a printing model, and outwards shifting the printing model along the normal direction of the printing target position;
(7) And calculating the UV coordinates of the offset printing model, and mapping the printing pattern onto the three-dimensional clothing model to obtain the plate printing effect.
2. The method of claim 1, wherein in step (2), the user input includes a user clicking a location point on the surface of the three-dimensional clothing model where the print is to be designed using a mouse.
3. The method for generating a printing effect on a three-dimensional garment model according to claim 2, wherein in the step (2), the printing target position is obtained by generating a ray which starts from a camera and passes through the positioning point according to the screen coordinates returned by the mouse click event, and intersecting the ray with the triangular mesh of the three-dimensional garment model to obtain the intersected triangle closest to the camera as the printing target position of the printing.
4. The method of generating a printing effect on a three-dimensional garment model according to claim 1, wherein in step (3), the normal direction, UV coordinates and tile information of the printing target position are acquired, comprising the steps of:
and reading the sheet information of the first vertex of the triangle as the sheet information of the printing target position, and finally carrying out interpolation calculation on the UV coordinates and the normal direction of the three vertices of the triangle where the printing target position is located to obtain the UV coordinates of the printing target position.
5. The method of generating a printing effect on a three-dimensional garment model according to claim 4, wherein the interpolation of UV coordinates uses the formula:
Wherein o is the print target position; a. b and c are three vertexes of a triangle where the printing target position is located, and d is the midpoint of the bc side; the od is the distance between the o and d points; v o is the UV coordinates of the o-point.
6. The method of claim 1, wherein the three-dimensional garment model and the printing model are each sized in mm.
7. A method of creating a printing effect on a three-dimensional garment model as claimed in claim 1, wherein in step (7) said mapping of the printed pattern to said three-dimensional garment model comprises the steps of: the offset printing UV coordinate range is mapped between [0,1] in a normalized mode, and UV coordinates P new after printing size correction are obtained through calculation; and performing texture mapping on the three-dimensional clothing model by using the pattern to be printed, and rendering the effect of plate printing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113111403A (en) * | 2021-03-29 | 2021-07-13 | 虞健 | Internet-based clothing pattern arrangement method, system and storage medium |
| CN113096229B (en) * | 2021-04-20 | 2022-06-21 | 浙江凌迪数字科技有限公司 | Real-time rendering method of glittering fabric in realistic clothing rendering |
| CN113398583A (en) * | 2021-07-19 | 2021-09-17 | 网易（杭州）网络有限公司 | Applique rendering method and device of game model, storage medium and electronic equipment |
| CN117315209B (en) * | 2023-10-17 | 2024-05-03 | 武汉亘星智能技术有限公司 | Clothing stacking method, device, equipment and medium based on energy model |
| CN118246257B (en) * | 2024-05-30 | 2024-07-30 | 浙江凌迪数字科技有限公司 | Method for generating a panel of a garment model, electronic device, storage medium, and computer program product |
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