WO2007125780A1 - 編構造モデル生成プログラム、編構造モデル生成装置、及び編構造モデル生成方法 - Google Patents
編構造モデル生成プログラム、編構造モデル生成装置、及び編構造モデル生成方法 Download PDFInfo
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- WO2007125780A1 WO2007125780A1 PCT/JP2007/058326 JP2007058326W WO2007125780A1 WO 2007125780 A1 WO2007125780 A1 WO 2007125780A1 JP 2007058326 W JP2007058326 W JP 2007058326W WO 2007125780 A1 WO2007125780 A1 WO 2007125780A1
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- knitting structure
- knitting
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/001—Texturing; Colouring; Generation of texture or colour
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/12—Cloth
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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
Definitions
- Knitting structure model generation program knitting structure model generation device, and knitting structure model generation method
- the present invention relates to a technique for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space generated on a computer.
- a knitted fabric is configured by combining several knitting patterns such as tack and knit, a symbol representing each knitting pattern is defined, and this symbol can be arranged to represent the structure of the knitted fabric. It has been made conventionally.
- a symbol representing a basic knitting pattern for example, a stitch symbol diagram standardized by Japanese Industrial Standard Qis) is known!
- Patent Document 1 a two-dimensional image is generated by selecting a modularized stitch image from a library in advance, and the two-dimensional image is used as one layer, and a plurality of layers are stacked.
- a technique for simulating a knitted fabric is disclosed.
- Patent Document 1 WO2003-0332204
- An object of the present invention is to easily estimate what kind of knitted fabric is knitted from the knitted structure data represented by a predetermined symbol in the knitting pattern of the yarn constituting the knitted fabric.
- a knitting structure model generation program for generating a model, a knitting structure model generation device, and a knitting structure model generation method for generating a model, a knitting structure model generation device, and a knitting structure model generation method.
- a knitting structure model generation program is a knitting structure model generation program for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, and Knitting structure data acquisition means for acquiring knitting structure data represented by symbols corresponding to the knitting pattern constituting the knitting pattern, and a node indicating a connection point of the yarn constituting the knitting material on a predetermined plane in the virtual three-dimensional space.
- the nodes arranged in the virtual three-dimensional space are connected by edges corresponding to yarns, and simplified knitting
- the computer functions as a simplified model generation means for generating a structural model.
- a knitting structure model generation apparatus is a knitting structure model generation apparatus that generates a knitting structure model of a knitted fabric in a virtual three-dimensional space, and the knitting structure of the knitted fabric forms a knitting structure.
- a knitting structure data acquisition means for acquiring knitting structure data represented by symbols according to patterns, and nodes indicating the connecting points of the yarns constituting the knitted fabric on a predetermined plane in a virtual three-dimensional space are in a grid pattern
- the nodes arranged in the virtual three-dimensional space are connected by the edge corresponding to the yarn, and the simplified knitting structure model And a simplified model generating means for generating.
- a knitting structure model generation method is a knitting structure model generation method for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, in which a computer, the knitting structure of the knitted fabric forms a knitting structure
- the knitting structure data represented by symbols corresponding to the knitting pattern to be acquired is acquired, and the computer arranges nodes indicating the connecting points of the yarns constituting the knitted fabric in a predetermined plane in a virtual three-dimensional space in a grid pattern.
- the computer connects the nodes arranged in the virtual three-dimensional space according to the acquired knitting structure data with an edge representing the connection relation between the nodes, and generates a simplified knitting structure model.
- knitting structure data in which a knitting pattern is represented by a predetermined symbol is acquired, and nodes arranged in a predetermined plane in the virtual three-dimensional space according to the knitting structure data, Connected by edges corresponding to yarns, a simplified knitted structure model is generated.
- a knitting structure model generation program provides a knitting structure of a knitted fabric in a virtual three-dimensional space.
- a knitting structure model generation program for generating a model, in which nodes indicating connection points of yarns constituting the knitted fabric are arranged in a grid on a predetermined plane in a virtual three-dimensional space, and each node corresponds to a yarn
- Each of the simple knitting structure model is obtained based on the simple model obtaining means for acquiring the simple knitting structure model connected by the edge to be processed and the edges constituting the simple knitting structure model obtained by the simple model obtaining means.
- a computer is made to function as a Dell generation means.
- a knitting structure model generation device is a knitting structure model generation device that generates a knitting structure model of a knitted fabric in a virtual three-dimensional space, and the knitting structure is placed on a predetermined plane in the virtual three-dimensional space.
- Simplified model obtaining means for obtaining a simplified knitting structure model in which nodes indicating connecting points of the constituent yarns are arranged in a grid and each node is connected by an edge corresponding to the yarn, and the simplified model obtaining means Based on the edges that make up the simplified knitting structure model obtained by the above, the stress acting on each node is obtained, and a predetermined external force is applied to each node in the direction intersecting the array plane of each node.
- a three-dimensional model generation means for generating a three-dimensional knitting structure model by solving the equation of motion.
- a knitting structure model generation method is a knitting structure model generation method for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, in which a computer is placed on a predetermined plane in the virtual three-dimensional space. Nodes indicating the connection points of the yarns constituting the knitted fabric are arranged in a lattice pattern, and a simple knitted structure model in which each node is connected by an edge corresponding to the yarn is obtained.
- a feature is that a three-dimensional knitting structure model is generated by obtaining a stress to be applied, applying a predetermined external force to each node in a direction intersecting the array plane of each node, and solving a motion equation of each node. .
- FIG. 1 is a block diagram showing a hardware configuration of a knitted structure model generation device according to an embodiment of the present invention.
- FIG. 2 A functional block diagram of the knitting structure model generation device is shown.
- FIG. 3 is a flowchart showing a main routine of the knitting structure model generation device.
- FIG. 4 is a diagram schematically showing a knitting structure of a knitted fabric
- FIG. 4A shows a knitting structure composed only of a knitting knitting pattern
- FIG. 4B shows a knitting structure in which a knitting pattern of a welt is arranged in the center
- FIG. 4C shows a knitting structure in which a tuck knitting pattern is arranged in the center.
- FIGS. 5A to 5C are diagrams showing knitting structure data corresponding to FIGS. 4A to 4C, respectively.
- FIG. 6 is a flowchart showing a simplified knitting structure model generation process shown in step S3 of FIG.
- FIG. 7 A diagram showing nodes arranged in the XY plane when the knitting structure data is 3 rows X 3 columns.
- FIG. 8 is a diagram showing a state where nodes are connected to each other.
- FIG. 9 is a diagram for explaining the processing in step S 13.
- FIG. 10 is a diagram for explaining the processing in step S 13.
- FIG. 11A and FIG. 11B are diagrams for explaining the processing in step S13.
- FIG. 12 is a flowchart showing details of the tack process shown in step S 16.
- FIG. 13 is a diagram for explaining the processing in step S21.
- FIG. 14 is a diagram for explaining tack processing.
- FIG. 15 is a flowchart showing details of the welt process.
- FIG. 16 is a diagram illustrating a welt process.
- FIG. 17 is a diagram illustrating a welt process.
- FIG. 18 is a diagram for explaining a welt process.
- FIG. 19 is a flowchart showing a process for generating a solid knitting structure model.
- FIG. 21 is a diagram showing the movement of the welt to the initial position with respect to the node.
- FIG. 21A shows a front view
- FIG. 21B shows a cross-sectional view from the top view.
- FIG. 22 is a diagram showing the movement of the tack node to the initial value
- FIG. 22A shows a front view
- FIG. 22B shows a cross-sectional view from the top view.
- FIG. 23 shows a perspective view of a node near the welt when the processes of steps S42 to S47 are repeatedly executed to some extent.
- FIG. 24 is a graph showing the external force acting on the third and fourth nodes of the welt, with the vertical axis indicating the external force and the horizontal axis indicating the distance.
- FIG. 25 is a diagram showing a simplified side view of the solid knitting structure model shown in FIG. 24.
- FIG. 26A and FIG. 26B are diagrams showing connection of nodes when a tack exists at the right end.
- FIGS. 27A and 27B are diagrams showing connection of nodes when a tack exists at the left end.
- FIG. 28 is a diagram illustrating calculation of stress.
- FIG. 29 is a diagram showing a circle set for a node.
- FIG. 30 is a diagram illustrating setting of a yarn path.
- FIG. 31 is a diagram for explaining a process for calculating a thread cross-sectional row.
- FIG. 32 is a diagram showing a rendering result of a 3D structure model.
- FIG. 33 is a diagram showing a three-dimensional knitting structure model when the knitting structure model shown in FIG. 32 is displayed in a reduced scale.
- FIG. 34 is a diagram showing a rendering result of a three-dimensional knitting structure model including a knitting pattern of a tack.
- FIG. 1 is a block diagram showing a hardware configuration of a knitted structure model generation device according to an embodiment of the present invention.
- the knitting structure model generation device is composed of a normal computer equal power, input device 1, ROM (read only memory) 2, CPU (central processing unit) 3, RAM (random access memory). 4), an external storage device 5, a display device 6, and a recording medium drive device 7.
- Each block is connected to an internal bus, and various data are input / output through this bus, and various processes are executed under the control of the CPU 3.
- the input device 1 includes a keyboard, a mouse and the like, and is used by a user to input various data.
- ROM2 stores system programs such as BIOS (Basic Input / Output System).
- BIOS Basic Input / Output System
- the external storage device 5 is configured with a hard disk drive or the like, and stores a predetermined OS (Operating System), a knitting structure model generation program, and the like.
- the CPU 3 reads a knitting structure model generation program or the like from the external storage device 5 and controls the operation of each block.
- the RAM 4 is used as a work area for the CPU 3.
- the display device 6 is composed of a liquid crystal display device or the like, and displays various images under the control of the CPU 3.
- the recording medium driving device 7 includes a CD-ROM drive, a flexible disk drive, and the like.
- the knitting structure model generation program is stored in a computer-readable recording medium 8 such as a CD-ROM and distributed to the yard.
- the user installs the knitting structure model generation program in the computer by causing the recording medium driving device 7 to read the recording medium 8.
- the knitting structure model generation program can be stored in a computer on the Internet and downloaded from this server to install the knitting structure model generation program in the computer.
- FIG. 2 shows a functional block diagram of the main model structure model generation apparatus.
- the knitting structure model generating apparatus includes a control unit 10, a storage unit 20, an input unit 30, and a display unit 40.
- the control unit 10 is composed of CPU 3 equal power, and includes the functions of a knitting structure data acquisition unit 11, a node arrangement unit 12, a simplified model generation unit 13, a 3D model generation unit 14, a rendering unit 15, and a display control unit 16. Yes. These functions are realized by the CPU 3 executing the knitting structure model generation program.
- the knitting structure data acquisition unit 11 acquires knitting structure data input by the user operating the input unit 30.
- the knitting structure data is data in which symbols predetermined for the knitting pattern constituting the knitting structure of the knitted fabric are arranged in a matrix with predetermined rows X predetermined columns.
- the knitted structure of the knitted fabric is a double-sided knitting composed of a front surface and a back surface.
- a knitted structure of a knitted fabric knitted by the arm is adopted.
- Three knitting patterns are used: knit, felt, and tack.
- the knitted patterns of the knit, welt, and tack arranged on the front surface are represented by the symbols “: K:”, “W”, and “T”, respectively, and the knit pattern, the welt, and the tuck arranged on the back surface.
- the knitting pattern of the tack is represented by the symbols “k”, “w”, and “t”, respectively.
- the node arrangement unit 12 arranges the nodes in a grid pattern in a predetermined plane in the virtual three-dimensional space according to the number of rows and columns of the knitting structure data acquired by the knitting structure data acquisition unit 11.
- the node indicates a connection point of yarns constituting the knitting pattern.
- the node arrangement unit 12 arranges the nodes in a predetermined plane so that four nodes are assigned to one symbol representing the knitting pattern. Of the four nodes assigned to a symbol, the upper left node is the first node, the upper right node is the second node, the lower left node is the third node, and the lower right node. This node is called the fourth node.
- the node arrangement unit 12 assigns the third and fourth nodes assigned to a certain symbol to the symbols positioned below and adjacent to the symbol, respectively. Share with first and second nodes. Therefore, the number of nodes arranged in a predetermined plane in the vertical direction matches the number of rows of the knitting structure data, and the number of nodes in the horizontal direction is a value obtained by doubling the number of columns of the knitting structure data. Note that the number of nodes in the vertical direction matches the number of rows of data because each node located at the upper end is shared with a node located at the lower end of the same column.
- the simplified model generation unit 13 connects the nodes arranged by the node arrangement unit 12 using edges corresponding to yarns in accordance with a node coupling rule predetermined for each knitting pattern, A simplified knitting structure model is generated.
- the generated simplified knitting structure model is stored in the simplified model storage unit 21 as necessary.
- the three-dimensional model generation unit 14 uses each node constituting the simplified knitting structure model generated by the simplified model generation unit 13 as a material point of the knitted fabric, applies a predetermined external force to each node, and The stress acting on each node is obtained from the connection relation of, and the solid knitting structure model is generated by solving the equation of motion of each node.
- the generated 3D knitting structure model is stored in the 3D model storage unit 22 as necessary.
- the rendering unit 15 renders the 3D knitting structure model generated by the 3D model generation unit 14 or the 3D knitting structure model stored in the 3D model storage unit 22.
- the display control unit 16 causes the display unit 40 to display the simple knitting structure model generated by the simple model generation unit 13 or the simple knitting structure model stored in the simple model storage unit 21. Further, the display control unit 16 causes the display unit 40 to display the 3D knitting structure model rendered by the rendering unit 15.
- the storage unit 20 includes the external storage device 5 shown in FIG. 1, and includes a simplified model storage unit 21 and a three-dimensional model storage unit 22.
- the simplified model storage unit 21 stores the simplified knitting structure model generated by the simplified model generation unit 13.
- the solid model storage unit 22 stores the solid knitting structure model generated by the solid model generation unit 14.
- the input unit 30 includes the input device 1 shown in FIG. 1, and is used when a user inputs knitting structure data.
- the display unit 40 includes the display device 6 shown in FIG. 1, and displays the simplified knitting structure model and the rendered three-dimensional knitting structure model under the control of the display control unit 16.
- FIG. 3 is a flowchart showing a main routine of the knitting structure model generating apparatus.
- step S1 when the input unit 30 is operated and knitting structure data is input by the user (YES in S1), the knitting structure data acquisition unit 11 acquires the knitting structure data input to the input unit 30. To do.
- step S1 when the knitting structure data by the user is not input to the input unit 30 (NO in S1), the process returns to step S1.
- FIG. 4 is a diagram schematically showing a knitted structure of a knitted fabric
- FIG. 4A shows a knitted structure composed only of a knitted knitted pattern
- FIG. 4B shows a knitted pattern of a welt arranged in the center
- FIG. 4C shows a knitting structure in which a tuck knitting pattern is arranged in the center.
- the upper diagram shows a front view of the knitted structure
- the lower diagram shows a top view of the second row of yarns.
- the yarns in which three loops are formed in the first to third columns are arranged in the first and third rows, and two yarns are arranged in the first and third columns.
- the yarns with the loop are arranged in the 2nd row, connected to the loop force in the 3rd row and the 2nd column, and the loop in the 1st row and the 2nd column, indicating that the welt knitting pattern is included.
- the second row is the front surface and the first and third rows are the back surface, as shown in the lower part of Fig. 4B, the first and third loops of the yarn in the second row It can be seen that the area corresponding to is closed on the back side, and the area corresponding to the loop in the second row is flat along the back side.
- FIGS. 5A to 5C are diagrams showing knitting structure data for FIGS. 4A to 4C, respectively.
- the first and third columns represent the back surface
- the second column represents the front surface
- the knit knitting pattern is arranged in 3 rows x 3 columns.
- the first and third columns are arranged with lowercase “k” symbols
- the second column is arranged with uppercase “K” symbols!
- the knitting structure data shown in Fig. 5 (b) includes the knitting pattern of the welt in the 2nd row and the 2nd column, as shown in Fig. 4 (b). Therefore, lower case “k” is arranged in each row of the first and third columns, and “K, W, ⁇ ” is arranged in the first to third rows of the second column.
- the knitting structure data shown in FIG. 5C is that the first and third rows represent the back surface and the second row represents the front surface. In each row, lower case “k” is arranged, and “ ⁇ , ⁇ , ⁇ ” is arranged in the 1st to 3rd rows of the second column.
- FIGS. 4A to 4C the knitting structure data of 3 rows ⁇ 3 columns is shown, but this is only an example, depending on the size of the knitting structure. The number of rows and the number of columns are appropriately changed.
- step S3 shown in FIG. 3 the node arrangement unit 12 arranges the nodes in a predetermined plane, and the simplified model generation unit 13 connects the arranged nodes to form a simplified knitting structure model to be described later.
- a generation process is executed to generate a simplified knitting structure model.
- step S4 the display control unit 16 causes the display unit 40 to display the knitting structure model generated by the simplified model generation unit 13.
- step S5 when the input to the input unit 30 is instructed by the user to generate a 3D knitting structure model (YES in S5), the 3D model generation unit 14 displays the simplified knitting structure generated by the simplified model generation unit 13. A three-dimensional structure model is generated from the model (S6).
- step S5 when the input unit 30 does not accept the instruction to generate the solid knitting structure model by the user (NO in S5), the process returns to step S5.
- the display control unit 16 is designated when the input of the user force designating the simplified knitting structure model generated in the past by the simplified model generating unit 13 is input to the input unit 30.
- the simplified structure model may be read from the simplified model storage unit 21 and displayed on the display unit 40.
- step S7 the rendering unit 15 renders the 3D knitting structure model generated in step S6, and the display control unit 16 displays the rendered 3D knitting structure model on the display unit 40 (S8). ).
- the input control unit 16 receives a user input from the user who designates the 3D knitting structure model generated in the past by the 3D model generation unit 14, the display control unit 16 displays the specified 3D knitting structure model. It may be read from the three-dimensional model storage unit 22 and displayed on the display unit 40.
- FIG. 6 is a flowchart showing the simplified knitting structure model generation process shown in step S3 of FIG.
- the node arrangement unit 12 arranges the nodes in a grid pattern in the XY plane in the virtual three-dimensional space according to the knitting structure data acquired by the knitting structure data acquisition unit 11.
- FIG. 7 is a diagram showing nodes arranged in the XY plane when the knitting structure data is 3 rows ⁇ 3 columns.
- the node array unit 12 assigns four nodes to one symbol representing the knitting pattern. Of the four nodes assigned to each symbol, the upper left node is the first node Nl, the right The upper node is the second node N2, the lower left node is the third node N3, and the lower right node is the fourth node N4.
- the node arrangement unit 12 is configured such that the third node N3 and the fourth node N4 assigned to a certain symbol are assigned to the symbols adjacent to the lower side of the symbol, respectively. Arrange each node to be shared with N1 and second node N2. For example, as shown in Figure 7, the third node N3 and the fourth node N4 assigned to the symbol in the first row and first column are assigned to the symbol in the second row and first column, respectively.
- the node arrangement unit 12 includes four nodes as shown in FIG. Arranged in the vertical direction, 6 nodes, which are 3 times the number of columns of the knitting structure data, are arranged in the horizontal direction, and a total of 24 nodes are arranged in the XY plane. In Fig. 7, the four nodes are arranged in the vertical direction. The upper node is shared with the lower node, so in reality, three nodes are arranged in the vertical direction. .
- step S12 shown in FIG. 6 the simplified model generation unit 13 connects nodes adjacent in the vertical direction using the first edge, and connects nodes adjacent in the horizontal direction to the first. Connect using edges.
- the first edge is associated with the first elastic constant used when calculating the stress acting on each node when the node is the mass point of the knitted fabric.
- a second edge described later is associated with a second elastic constant that is smaller than the first elastic constant.
- FIG. 8 is a diagram showing a state where nodes are connected to each other. As shown in FIG. 8, it can be seen that nodes adjacent in the horizontal direction and nodes adjacent in the vertical direction are connected by the first edge E1. Note that two or three first edges E1 are connected to the nodes arranged at the upper end, the lower end, the left end, and the right end. On the other hand, the nodes existing inside are divided by the fact that the four first edges E1 are connected.
- step S 13 shown in FIG. 6 the simplified model generation unit 13 connects the nodes located at the upper end and the lower end, and connects the nodes located at the left end and the right end to create a simplified knitting structure model. Make a torus. 9 to 11 are diagrams for explaining the processing in step S13.
- the simplified model generation unit 13 selects nodes NL1 to NL4 located at the left end. Are connected to the rightmost nodes NR1 to NR4 located in the same row by the first edge El, respectively, and the nodes NU1 to NU10 located at the upper end are respectively connected to the lowermost nodes ND1 to ND10 located in the same column. Connect with wedge E1.
- a simple knitting structure model as shown in FIG. 10 when used as one knitting structure unit, a simple knitting structure model in which a plurality of the knitting structure units are arranged in a matrix is generated. Even if the nodes are not arranged over the entire area of the simplified knitting structure model, the entire area can be represented only by arranging the nodes only in the area of the knitting structure unit, and the data amount of the simplified knitting structure model can be reduced. It can be greatly reduced. This can be compared to connecting the upper side and the lower side of the rectangular plane shown in FIG. 11A and connecting the left side and the right side to transform the plane into a torus shape shown in FIG. 11B.
- step S14 the simplified model generation unit 13 includes only the knitting pattern of the knit in the knitting structure data acquired by the knitting structure data acquisition unit 11, and includes the knitting pattern of the welt and tack. If not (YES in S14), the simplified knitting structure model for the knitting structure data has been completed, and the process ends. On the other hand, if the knitting structure data includes a welt or tuck knitting pattern other than knit (NO in S14), the process proceeds to step S15.
- step S15 when the knitting structure data includes a tucked knitting pattern (YES in S15), the simplified model generation unit 13 performs subsequent processing on the nodes arranged in the XY plane.
- the tack process described below is executed (S16). As a result, a simplified knitting structure model having a tuck knitting pattern is generated.
- step S15 if a tack knitting pattern is included (NO in S15), the process proceeds to step S17.
- step S 17 when the knitting structure data includes a welt knitting pattern (YES in S 17), the simplified model generation unit 13 executes a welt process described later (S 18). As a result, a simplified knitting structure model having a welt knitting pattern is generated. On the other hand, if the step S 17 includes the knitting pattern of! /,! /,! / (NO in S 17), the processing is terminated through the welt processing.
- FIG. 12 is a flowchart showing details of the tack process shown in step S16 of FIG.
- step S21 the simplified model generation unit 13 performs the tacking of the knitting structure data.
- the third node N3 and the fourth node N 4 assigned to the target tack indicating 1 tack are deleted and connected to each of the third node N3 and the fourth node N4. Delete the first edge E1.
- FIG. 13 is a diagram for explaining the processing in step S21. As shown in FIG. 13, the third node N3 and the fourth node N4 allocated to the target task T are deleted, and the four first nodes connected to the third node N3 are deleted. It can be seen that the edge E1 is deleted and the four first edges E1 connected to the fourth node N4 are deleted.
- the simplified model generation unit 13 applies the first node N1 assigned to the target tack T and the lower knit K adjacent to the lower side of the tack T.
- the assigned third node N3 is connected to the first edge E1 (S22), and the second node N2 assigned to the target tack T and the fourth node assigned to the lower knit K are connected.
- the node N 4 is connected by the first edge E1 (S23).
- the simplified model generation unit 13 adjoins the left side of the target tack T, the fourth node N4 of the left knit k, and the first node N1 of the target tack T. Are connected at the first edge E1 (S24), and the third node N3 of the right knit k adjacent to the right side of the target tack T and the second node N2 of the target tack T are connected by the first edge E1. Connect (S25).
- a simplified knitting structure model including the knitting pattern of the attention tack T shown in FIG. 14 is generated. It should be noted that the simplified model generation unit 13 repeatedly executes the above processing using each tack symbol included in the knitting structure data as a target tack.
- FIG. 15 is a flowchart showing details of the welt process shown in step S18 of FIG. 16 to 18 are diagrams for explaining the welt processing.
- the welt process will be described with reference to FIGS.
- the simplified model generation unit 13 compares the first node N1 and the first node N1 assigned to the target welt W indicating one welt among the welts constituting the knitting structure data. Delete the first edge E1 that connects the third node N3 (S31), and delete the first edge E1 that connects the second node N2 and the fourth node N4 assigned to the target welt W (S32).
- the simplified model generation unit 13 deletes the first edge E1 that connects the first node N1 and the third node N3 assigned to the lower knit K adjacent to the lower side of the target welt W. (S33), lower knit K The first edge El connecting the allocated second node N2 and fourth node N4 is deleted (S34).
- the simplified model generation unit 13 includes a first node N1 assigned to the target welt W and a third node assigned to the lower knit K adjacent to the lower side. N3 is connected at the first edge E1 (S35), and the second node N2 assigned to the target welt W is connected to the fourth node N4 assigned to the lower neighbor K. Connect using the first edge E 1 (S36).
- the force that widely displays the distance between the third node N3 and the fourth node N4 of the target welt W is actually the target welt.
- the interval between the third node N3 and the fourth node N4 of W is the same as the interval shown in FIG.
- the simplified model generation unit 13 connects the first node N1 and the third node N3 assigned to the target welt W with the second edge E2, and The second node N2 and the fourth node N4 assigned to the attention belt W are connected by the second edge E2 (S38).
- the simplified model generation unit 13 connects the first node N1 and the third node N3 assigned to the lower knit K with the second edge E2, and The second node N2 assigned to the knit K and the fourth node N4 are connected by the second edge E2 (S39).
- the simplified model generation unit 13 executes the above processing using each welt constituting the knitting structure data as a target welt.
- FIG. 19 is a flowchart showing the process of generating the solid knitting structure model.
- the three-dimensional model generation unit 14 arranges the simplified knitting structure model generated by the simple model generation unit 13 on the XY plane, and moves each node to a predetermined initial position.
- FIG. 20 is a diagram showing a simplified knitting structure model in which only the knitting pattern of the 3 rows ⁇ 3 columns knit arranged in the virtual three-dimensional space is effective. As shown in FIG. 20, x, y, and z axes orthogonal to each other are set in the virtual three-dimensional space, and the simplified knitting structure model is arranged on the XY plane.
- FIG. 20 is a diagram showing a simplified knitting structure model in which only the knitting pattern of the 3 rows ⁇ 3 columns knit arranged in the virtual three-dimensional space is effective.
- x, y, and z axes orthogonal to each other are set in the virtual three-dimensional space, and the simplified knitting structure model is arranged on the XY plane.
- the nodes arranged in the 1st, 2nd, 5th, and 6th columns from the left indicate the nodes on the back, and are arranged in the 3rd and 4th columns from the left.
- Node shows surface node Yes. Then, each node on the back surface is slid by a certain distance in the ⁇ Z direction, and each node on the front surface is slid by a certain distance in the + Z direction, thereby moving to a predetermined initial position.
- the slide amount of each node on the back surface and the slide amount of each node on the front surface may be the same or different values.
- FIG. 21 is a diagram showing movement of the welt W to the initial position with respect to the node
- FIG. 21A shows a front view
- FIG. 21B shows a cross-sectional view from the top view.
- the third node N3 and the fourth node N4 of the welt W are not slid in the Z direction and are located on the XY plane.
- the first nodes N1 and N2 of the welt W are the nodes on the surface, they are slid by a certain distance in the Z direction.
- the fourth node N4 of the knit K adjacent to the left side and the third node N3 of the knit K adjacent to the right side are slid a certain distance in the z direction because they are nodes on the back side. .
- FIG. 22 is a diagram showing the movement of the tack T to the initial value with respect to the node
- FIG. 22A shows a front view
- FIG. 22B shows a cross-sectional view from the top view.
- the first node N1 and the second node N2 of the tack T are the nodes on the surface, which are slid a predetermined distance in the z direction, and the fourth of the knit K adjacent to the left side.
- the node N4 of the back is a node on the back surface, and is slid a predetermined distance in the z direction
- the third node N3 of the knit K adjacent to the right side is a node on the back surface, and it is understood that the node is slid a predetermined distance in the z direction.
- the shape of the cross-sectional sight of the tack T has a mountain shape like the shape of the cross-sectional sight of the knit K.
- step S42 shown in FIG. 19 the three-dimensional model generation unit 14 calculates an external force that acts on the third node N3 and the fourth node N4 of the welt W.
- FIG. 23 shows a perspective view of a node in the vicinity of the welt W when the processes of steps S42 to S47 are repeatedly executed to some extent.
- the three-dimensional model generation unit 14 includes the first node N1 and the second node N2 of the welt W and the third knit K of the knit K adjacent to the lower side of the welt W.
- the distance between the rectangular plane constituted by the node N3 and the fourth node N4 and the third node N3 is calculated as the distance between the third node N3 and the surface of the solid knitting structure model.
- the three-dimensional model generation unit 14 calculates the distance between the rectangular surface and the fourth node N4 as the distance between the fourth node N4 and the surface of the three-dimensional knitting structure model.
- the three-dimensional model generation unit 14 includes the second node N2 and the fourth node N4 of the knit k adjacent to the left side of the welt W, and the first node of the knit k adjacent to the right side of the welt W.
- the distance between the rectangular plane constituted by N1 and the third node N3 and the third node N3 is calculated as the distance between the third node N3 and the back surface of the solid knitting structure model.
- the three-dimensional model generation unit 14 calculates the distance between the fourth node N4 and the rectangular surface as the distance between the fourth node N4 and the back surface of the three-dimensional knitting structure model.
- step S43 the three-dimensional model generation unit 14 obtains an external force acting on each of the third nodes N3 and N4 of the welt W using the distance calculated in step S42.
- FIG. 24 is a graph showing the external force acting on the third node N3 and the fourth node N4 of the welt, where the vertical axis indicates the external force and the horizontal axis indicates the distance.
- the external force is defined by a function that is inversely proportional to the distance.
- F AZd.
- F is an external force
- A is a constant
- d is the distance between the third node N3 or N4 of the felt W and the front or back surface of the solid knitting structure model.
- the external force is defined by a function inversely proportional to the distance.
- the thread force welt corresponding to the first edge E1 connecting the third node N3 and the fourth node N4 of the welt W In order to reproduce the repulsive force generated by contacting the yarn corresponding to the first edge E1 that connects the first node N1 of W and the third node N3 of the lower knit K of the welt W is there.
- FIG. 25 is a diagram showing a simplified side view of the three-dimensional knitting structure model shown in FIG.
- the upper side of the rectangular frame indicates the front surface of the three-dimensional knitting structure model
- the lower side indicates the back surface of the three-dimensional knitting structure model
- step S44 shown in FIG. 19 the solid model generation unit 14 uses the equations (1) to (4) to connect the nodes connected by the first edge E1 or the second edge E2. Calculate the distance between them. [Picture] d xi— Xj
- 2 (i) ij
- the three-dimensional model generation unit 14 applies an expression to nodes located inside other than the upper end, the lower end, the right end, and the left end, such as the node Nil and the node Ni2 shown in FIG. Use (1) to calculate the distance.
- dij represents the distance between the nodes Pi and Pj located inside
- xi, yi, zi represents the x, y, z components of Pi, respectively
- xj, yj, zj Show the X, y, and z components of Pj, respectively.
- the three-dimensional model generation unit 14 calculates the distance between the left end and right end nodes as in the node NL2 and the node NR2 shown in FIG. 9, using the formula (2) or (3).
- xi> xj the distance between nodes is calculated using equation (2).
- xi ⁇ xj the distance between nodes is calculated using equation (3).
- the case of xi> xj corresponds to the case where Pj is located at the left end and Pi is located at the right end in FIG. 9, and the case where xi ⁇ xj is the case where Pj is located at the right end in FIG. This is the case when Pi is located at the left end.
- w represents the initial value of the distance between the leftmost node of the simplified knitting structure model and the rightmost node located on the same line as the node.
- Equation (2) the first term on the right side is the force xi—xj—w. Simplify the position of node Pj in the X direction
- the three-dimensional model generation unit 14 calculates the distance between the upper end and lower end nodes using Formula (4) or (5), as in the nodes NU2 and ND2 shown in FIG. However, if yi> yj, the distance between nodes is calculated using equation (4). If yi ⁇ yj, the distance between nodes is calculated using equation (5).
- the case of yi> yj corresponds to the case where Pj is located at the upper end and Pi is located at the lower end in FIG. 9, and the case of yi ⁇ yj is the case where Pj is located at the lower end in FIG. This is the case when Pi is located at the top.
- h represents the initial value (vertical width initial value) of the distance between the rightmost node of the solid knitting structure model and the lowermost node located in the same column with respect to the node.
- Equation (4) the second term on the right side is the force yi—yj—h. This is the top node so that if it is transformed into yi— (yj + h) Move the position in the y direction of Pj to the position where h, which is the initial value of the vertical width of the simplified knitting structure model, is added, and the distance between the moved node and the lower end node Pi is the upper node and lower end This means that it is calculated as the distance to the other node. As a result, the distance between the nodes connected across the upper end force and the lower end is corrected to the distance between adjacent nodes located inside, so that a three-dimensional knitting structure model can be generated more comfortably. it can.
- the three-dimensional model generation unit 14 changes the knit K located at the left end of the same row to the knit K ′ adjacent to the right side. Instead, instead of connecting the second node N2 of tack T and the third node N3 of knit K 'with the first edge ⁇ , the second node ⁇ 2 of tack ⁇ and Connect the 3rd node ⁇ 3 of the knit ⁇ on the left end with the 1st edge E1 so that it can be removed.
- the three-dimensional model generation unit 14 uses the equation (7) or the equation (8) to calculate the third node ⁇ 3 of the knit ⁇ located at the left end shown in Fig. 26 ⁇ and the right end tack ⁇ Calculate the distance from the second node ⁇ 2. yj) (6) yj) (7)
- the three-dimensional model generation unit 14 adjoins the knit K located at the right end of the same row to the left side of the same row.
- the first node E1 is connected to the fourth node N4 of the knit and the fourth node N4 of the knit so as to be tacked.
- the three-dimensional model generation unit 14 uses the fourth node N4 of the knit K located at the right end shown in FIG. 27B and the right end tack T using Equation (6) or Equation (9). Calculate the distance to the first node N1. Specifically, when the first node N1 of the leftmost tuck T is the node Pj and the fourth node N4 of the rightmost knit K is the node Pi, using the equation (6), between the nodes Pi and Pj If the first node N1 of the leftmost tack T is the node Pi and the fourth node N4 of the rightmost knit K is the node Pj, the nodes Pi and Pj are calculated using equation (9). Calculate the distance between. As a result, the nodes Pi and Pj are corrected to the extent of the distance between the nodes located inside, so that a three-dimensional knitting structure model can be generated without a sense of incongruity.
- step S45 shown in FIG. 19 the three-dimensional model generation unit 14 calculates the stress acting on each node using the distance between the nodes calculated in step S44.
- the solid model generation unit 14 calculates the second and third terms on the right side of Equation (10) as stress.
- the third term in equation (10) is expressed as equation (11).
- Pi is the node to which the equation of motion applies and Pj is the other node connected to Pi Mi represents the mass of the node Pi, ci represents the viscous resistance of the node Pi, kij represents the viscoelastic constant, and vi represents the velocity of the node Pi.
- Pi, Pj, vi, and fi are vector vectors consisting of three components: x, y, and z.
- ki1, ki2, and ki3 represent the first elastic constant
- the node P4 is connected to the node Pi.
- ki4 is represented by a second elastic constant smaller than the first elastic constant because it is connected by the second edge E2.
- the first elastic constant is associated with the first edge E1
- the second elastic constant is associated with the second edge E2.
- the three-dimensional model generation unit 14 calculates the second term of the equation (10) by multiplying the velocity vi of the node Pi obtained by solving the equation of motion of the equation (10) by the viscous resistance ci.
- the viscosity resistance ci may be the same value for all nodes, or may be changed depending on how many first and second edges are connected to each node.
- step S46 shown in FIG. 19 the three-dimensional model generation unit 14 calculates the position and velocity of each node Pi by solving the equation of motion shown in Expression (10) established for each node Pi.
- the fi on the left side of Equation (10) indicates the external force that acts on each node Pi calculated in step S43.
- mi represents the mass of the mass point of the knitted fabric.
- the value of mi may be the same value for all nodes, or may be a different value.
- As the value of mi a value determined in advance from the relationship between the type of knitted fabric and the size of the knitted fabric when the knitted fabric is represented by the node and the number of nodes is adopted.
- the three-dimensional model generation unit 14 solves the equation of motion of each node using the equation (12) representing the difference equation of the equation of motion shown in the equation (10).
- step S47 the three-dimensional model generation unit 14 determines whether or not the solution of the equation of motion shown in Equation (12) has converged within a predetermined range, and if it is determined that it has converged (YES in S47), The process proceeds to step S48, and if it is determined that it has not converged (NO in S47), the process returns to step S42. In other words, the equation of motion is repeatedly calculated until the solution of the equation of motion shown in Equation (12) converges.
- the convergence of the solution of the equation of motion means that the difference between the latest solution and the previously calculated solution is larger than the predetermined value for Pi indicating the position of each node or vi indicating the velocity shown in Equation (12). This is the case when the size is smaller. Alternatively, it may be determined that the solution has converged when the number of calculations of the equation of motion reaches a predetermined number.
- step S48 the three-dimensional model generation unit 14 sets a circle for setting a yarn in the three-dimensional knitted structure model according to the edge connected to each node. Specifically, as shown in Fig. 29, when setting the thread corresponding to the edge EA, EB connected to the node Pi, the circumference passes through the node Pi, and the center Ol is on the edge EA and EB side. Set a circle C1 with a predetermined radius so that it is located at. Also, when setting the thread corresponding to edge EB and EC connected to node Pj, set circle C2 with a predetermined radius so that it passes through node Pj and center 02 is located on edge EB and EC side. .
- the circles CI and C2 have a radius that is determined in advance according to the physical properties of the yarn. A different value may be used for each node, or the same value may be used.
- step S49 the three-dimensional model generation unit 14 sets a circle having a radius larger than that of the circle set to each node in a concentric shape. Specifically, as shown in FIG. 30, a circle C3 having a larger radius than the circle C1 set for the node Pi is set concentrically, and a circle C4 having a larger radius than the circle C2 set for the node Pj is set. To be concentric.
- step S50 shown in FIG. 19 the three-dimensional model generation unit 14 sets two lines that smoothly connect two circles set for each node as thread paths. Specifically, as shown in Fig. 30, if a thread path P (k) that smoothly connects the circle C1 and the circle C4 is set,
- the radius of C4 is the thickness of the thread where the distance between P (k) and P (k) is determined according to the type of thread
- K is a parameter for expressing the yarn path, and ⁇ ⁇ k ⁇ Let ⁇ be the domain.
- step S51 the three-dimensional model generation unit 14 performs a process of smoothing the two set yarn paths.
- the three-dimensional model generation unit 14 calculates a first-order term when a Fourier series expansion is performed on the function (original function) representing the set yarn path, and calculates the first-order term that calculates the original function force.
- the original function is smoothed by expanding the function obtained by subtracting the Fourier series to the low-order (eg, third-order term).
- the three-dimensional model generation unit 14 divides the original function into three components X, y, and z, and executes the above-described processing for each component.
- step S52 shown in FIG. 19 the three-dimensional model generation unit 14 obtains a circle having a diameter of a straight line connecting the end points of the two smoothed yarn paths as the yarn cross section. Specifically, as shown in Fig. 31, P (k) indicating a point on one of the two yarn paths is set to be the same as k.
- a circle whose diameter is P (k) indicating a point on the other thread path is obtained as a thread cross section. So
- P (k) indicating one point on the circumference of the yarn cross-section is expressed by equation (13). [0103] P L (k) -P R (k) ⁇ P L (k) -P f 'P L (k) -P R (k).
- (P (k) -P (k)) Z2 in the first term is a group indicating the radius of the thread cross section as shown in FIG.
- the coefficient of si ⁇ ⁇ in the second term indicates the outer product of vector C and basis vector ⁇ , and indicates basis vector B on the yarn cross section.
- ⁇ is a variable for expressing the circumference of the yarn cross section using basis vectors A and B.
- the third term (P (k) + P (k)) Z2 indicates the center O of the yarn cross section.
- step S53 shown in FIG. 19 the three-dimensional model generation unit 14 connects the circumferences of the yarn cross-sectional rows with polygons, and sets the circumferential surface of the yarn as a three-dimensional knitted structure model.
- FIG. 32 is a diagram showing a rendering result of the 3D knitting structure model generated by the 3D model generation unit 14. As shown in FIG. 32, it can be seen that an infinite number of yarns are knitted according to the knitting pattern.
- FIG. 33 is a diagram showing a three-dimensional knitting structure model when the knitting structure model shown in FIG. 32 is displayed in a reduced scale. As shown in FIG. 33, it can be seen that a realistic three-dimensional knitting structure model is generated by executing the above-described processing.
- FIG. 34 shows a rendering result of the three-dimensional knitting structure model including the tuck knitting pattern. As shown in FIG. 34, in the tuck knitting pattern, since two yarns are connected to the first node N1 and the second node N2, the first node N1 and the second node N2 are connected as shown by the arrows. It can be seen that as a result of the force that narrows the width with node N2, a three-dimensional knitted structure model with many holes formed is generated.
- a solid knitted structure model of the knitted fabric is generated by solving the equation of motion of each node when a given external force is applied and each node is the mass point of the knitted fabric.
- a knitted structure model can be obtained.
- the simplified knitting structure model is displayed on the display unit 40.
- the present invention is not limited to this, and printing may be performed on recording paper using output means such as a printer.
- output means such as a printer.
- a double-sided knitted fabric is used.
- the present invention is not limited to this, and the present invention may be applied to a single-sided knitted fabric.
- the lower knit K is described as being adjacent to the attention tack T. Even if the knit is not adjacent, the same row and force as the attention tack T are shown. A knit located on the lower side may be adopted as the lower knit.
- a knitting structure model generation program is a knitting structure model generation program for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, and the knitting structure of the knitted fabric is converted into a knitting pattern constituting the knitting structure.
- Nodes for arranging knitting structure data acquisition means for acquiring knitting structure data represented by corresponding symbols, and nodes indicating the connecting points of the yarns constituting the knitting in a predetermined plane in a virtual three-dimensional space In accordance with the knitting structure data acquired by the arrangement means and the knitting structure data acquisition means, the nodes arranged in the virtual three-dimensional space are connected by edges corresponding to yarns, and a simplified knitting structure that simply represents the knitted fabric
- the computer is made to function as a simplified model generation means for generating a model.
- a knitting structure model generation device is a knitting structure model generation device that generates a knitting structure model of a knitted fabric in a virtual three-dimensional space, and the knitting structure of the knitted fabric forms a knitting structure.
- a knitting structure data acquisition means for acquiring knitting structure data represented by symbols according to patterns, and nodes indicating the connecting points of the yarns constituting the knitted fabric on a predetermined plane in a virtual three-dimensional space are in a grid pattern Obtained by the node arranging means arranged in the above and the knitting structure data obtaining means.
- simple model generating means for connecting nodes arranged in the virtual three-dimensional space by edges corresponding to yarns and generating a simplified knitted structure model.
- a knitting structure model generation method is a knitting structure model generation method for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, in which a computer, the knitting structure of the knitted fabric forms a knitting structure
- the knitting structure data represented by symbols corresponding to the knitting pattern to be acquired is acquired, and the computer arranges nodes indicating the connecting points of the yarns constituting the knitted fabric in a predetermined plane in a virtual three-dimensional space in a grid pattern.
- the computer connects the nodes arranged in the virtual three-dimensional space according to the acquired knitting structure data with an edge representing the connection relation between the nodes, and generates a simplified knitting structure model.
- knitting structure data in which a knitting pattern is represented by a predetermined symbol is acquired, and nodes arranged in a predetermined plane of a virtual three-dimensional space according to the knitting structure data are Connected by edges corresponding to yarns, a simplified knitted structure model is generated.
- the knitting structure data has a data structure in which symbols corresponding to the knitting pattern are arranged in a matrix, and the node arrangement means are adjacent in a lattice shape.
- One node is assigned to each symbol, and the four nodes assigned to each symbol are the first node located in the upper left, the second node located in the upper right, the third node located in the lower left, 4th node located in the lower right, and among the symbols indicating the knitting pattern constituting the knitting structure data, the third and fourth assigned to the attention symbol which is the one symbol of interest.
- the node is preferably shared with the first and second nodes assigned to the adjacent symbol below the symbol of interest.
- the first to fourth nodes located at the upper left, upper right, lower left, and lower right adjacent to each other in a lattice shape are assigned to each symbol.
- each node is arranged so that the third and fourth nodes assigned to a certain symbol are shared with the first and second nodes assigned to the symbols adjacent to the lower side of the symbol. . So, for example, 2 If the edges of the book are connected, it can be shown that two threads are connected to this node.
- the knitting structure data includes a knitting knitting pattern
- the simplified model generation means connects nodes adjacent in the vertical direction and the horizontal direction with edges. So, it is preferable to generate a simplified knitting structure model.
- the knitting structure data includes a knitting pattern of knit and tack, and attention is the one tack symbol of interest among the knitting patterns constituting the knitting structure data.
- the left knit symbol indicating the knit knitting pattern is adjacent to the left side of the tuck symbol
- the right knit symbol indicating the knit knitting pattern is adjacent to the right side of the attention tuck symbol
- the lower side of the attention tuck symbol is below.
- There is a lower knitting symbol indicating a knitting pattern of the knit and the simplified model generating means connects nodes adjacent in the vertical direction and the horizontal direction with edges, and the third and fourth assigned to the attention tack symbol.
- the edge connected to the third and fourth nodes are deleted, the first node and the second node assigned to the attention tack symbol are connected by two edges, and the attention tack is selected.
- the third node assigned to the right knit symbol and the second node assigned to the attention tack symbol are connected by an edge, and the above processing is executed using the symbol of each tack as the attention tack symbol. I prefer that.
- the edge includes a first edge indicating a first stress acting on each node, and a second edge indicating a second stress weaker than the first stress.
- the knitting structure data includes a knitting pattern of knit and welt, and the knitting structure data includes Among the constituent symbols, the lower knit symbol indicating the knitting pattern of the knit is adjacent to the lower side of the target welt symbol which is the one of the target welt symbols, and the simplified model generation means is adjacent in the vertical and horizontal directions. And the first edge that connects the first and third nodes assigned to the target welt symbol and the second and fourth nodes is deleted.
- the first edge connected between the first and third nodes assigned to the lower knit symbol and between the second and fourth nodes is deleted, and the first edge assigned to the noted welt symbol is deleted.
- the third node are connected by a second edge
- the second and fourth nodes assigned to the target welt symbol are connected by a second edge
- the second node assigned to the lower knit symbol is connected.
- 1st and 2nd 3 nodes are connected by the second edge
- the second and fourth nodes assigned to the lower knit symbol are connected by the second edge
- the first node assigned to the target welt symbol is connected.
- the node is connected to the third node assigned to the lower knit symbol at the first edge
- the second node assigned to the noted welt symbol is assigned to the lower knit symbol. It is preferable to connect the fourth node with the first edge and perform the above processing using each welt symbol as the target welt symbol.
- the simplified model generation means connects each of the nodes positioned at the left end to the node positioned at the right end of the same row, and each of the nodes positioned at the upper end. It is preferable to generate a simplified knitting structure model by connecting to a node located at the lower end of the same row.
- the node indicates the mass point of the knitted fabric
- the edge indicates the stress acting on the mass point
- the simplified knitting structure model generated by the simplified model generating means configures the simplified knitting structure model generated by the simplified model generating means.
- the stress acting on each node is obtained based on the edge to be
- the computer further functions as a three-dimensional model generating means for generating a three-dimensional knitted structure model by applying a predetermined external force in a direction intersecting with the arrangement plane of each node and solving a motion equation of each node.
- a stress corresponding to the type of edge to be connected is applied to each node, and a predetermined external force is applied to each node.
- a three-dimensional knitted structure model of the knitted fabric is generated, so that a three-dimensional knitted structure model that takes into account the mechanical characteristics of the knitted fabric can be obtained.
- the predetermined external force is in a direction that intersects with the arrangement surface of the nodes, the node is easily moved in the direction that intersects with the arrangement surface, and the knitting pattern of the yarn can be represented more three-dimensionally.
- the knitted fabric is a double-sided knitted knitted fabric having a front surface and a back surface
- the three-dimensional model generation means includes third and fourth nodes assigned to the symbols of the welt. It is preferable to apply a repulsive force that is inversely proportional to the distance to the front surface and the distance to the back surface as an external force!
- the solid model generation means sets two circles having different radii to each node in a concentric circle shape, and sets two circles set as a certain attention node and the attention node. It is preferable to set two lines that smoothly connect two circles set to other nodes connected to the node by edges as thread paths.
- the three-dimensional model generation means is a first order when the three-dimensional model generation means performs Fourier series expansion on the original function representing the yarn path. It is preferable to smooth the thread path by subtracting the original function force and subtracting the original function force and expanding the Fourier function to a predetermined low-order term and then adding the first-order term. Good. [0135] According to this configuration, since the first-order term is subtracted from the original function force, and the Fourier series expansion up to the lower-order term is performed on the subtracted function, the first-order term is added.
- a smoother yarn can be set as a three-dimensional knitting structure model while maintaining continuity.
- a knitting structure model generation program is a knitting structure model generation program for generating a knitting structure model of a knitted article in a virtual three-dimensional space, and the knitting structure model generation program is provided on a predetermined plane in the virtual three-dimensional space.
- Simplified model acquisition means for acquiring a simplified knitting structure model in which nodes indicating connection points of yarns constituting the knitted fabric are arranged in a grid and each node is connected by an edge corresponding to the yarn, and the simplified model acquisition Based on the edges constituting the simplified knitting structure model obtained by the means, the stress acting on each node constituting the simplified knitting structure model is obtained, and for each node, the arrangement plane of each node intersects.
- the computer is caused to function as a solid model generating means for generating a solid knitted structure model.
- a knitting structure model generation apparatus is a knitting structure model generation apparatus that generates a knitting structure model of a knitted fabric in a virtual three-dimensional space, and is arranged on a predetermined plane in the virtual three-dimensional space.
- Simplified model obtaining means for obtaining a simplified knitting structure model in which nodes indicating connection points of yarns constituting the knitted fabric are arranged in a grid and each node is connected by an edge corresponding to the yarn, and the simplified model obtaining means Based on the edges that make up the simplified knitting structure model obtained by the above, the stress acting on each node is obtained, and a predetermined external force is applied to each node in the direction intersecting the array plane of each node.
- a three-dimensional model generation means for generating a three-dimensional knitting structure model by solving the equation of motion of
- the knitting structure model generation method is a knitting structure model generation method for generating a knitting structure model of a knitted fabric in a virtual three-dimensional space, in which a computer has a predetermined structure in a virtual three-dimensional space. Nodes indicating connection points of yarns constituting the knitted fabric are arranged in a plane on a plane, and a simple knitted structure model in which each node is connected by an edge corresponding to the yarn is obtained, and the computer obtains the simple model.
- the stress acting on each node of the simplified knitting structure model is obtained based on the edges constituting the simplified knitting structure model obtained by the means, and each node is predetermined in the direction intersecting the array plane of each node.
- Give each external force It is characterized by generating a 3D knitting structure model by solving equations of motion acting on nodes.
- a stress corresponding to the type of edge to be connected is applied to each node, and a predetermined external force is applied to each node.
- a three-dimensional knitted structure model of the knitted fabric is generated, so that a three-dimensional knitted structure model that takes into account the mechanical characteristics of the knitted fabric can be obtained.
- the predetermined external force is in a direction that intersects with the arrangement surface of the nodes, the node is easily moved in the direction that intersects with the arrangement surface, and the knitting pattern of the yarn can be represented more three-dimensionally. it can.
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US12/226,645 US7738990B2 (en) | 2006-04-25 | 2007-04-17 | Knitting structure model generating program, knitting structure model generating device and knitting structure model generating method |
AU2007244539A AU2007244539B2 (en) | 2006-04-25 | 2007-04-17 | Knitting structure model generating program, knitting structure model generating device and knitting structure model generating method |
EP07741762A EP2015205B1 (en) | 2006-04-25 | 2007-04-17 | Knitting structure model generating program, knitting structure model generating device and knitting structure model generating method |
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JP2006121365A JP5089912B2 (ja) | 2006-04-25 | 2006-04-25 | 編構造モデル生成プログラム、編構造モデル生成装置、及び編構造モデル生成方法 |
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JP4944023B2 (ja) * | 2005-05-27 | 2012-05-30 | 株式会社島精機製作所 | ニットシミュレーション装置とシミュレーション方法及びそのプログラム |
JP4808596B2 (ja) * | 2006-11-21 | 2011-11-02 | デジタルファッション株式会社 | 編構造モデル生成プログラム、編構造モデル生成装置、及び編構造モデル生成方法 |
US20090112353A1 (en) * | 2007-09-28 | 2009-04-30 | Smartpatterns Inc. | System and method for design of stitched objects |
KR101356987B1 (ko) * | 2009-11-26 | 2014-01-29 | 가부시키가이샤 시마세이키 세이사쿠쇼 | 니트 디자인 장치와 디자인 방법, 디자인 프로그램 |
JP5516192B2 (ja) * | 2010-07-28 | 2014-06-11 | 富士通株式会社 | モデル作成装置、モデル作成プログラムおよびモデル作成方法 |
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Also Published As
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EP2015205B1 (en) | 2013-03-06 |
JP5089912B2 (ja) | 2012-12-05 |
AU2007244539B2 (en) | 2012-03-01 |
EP2015205A1 (en) | 2009-01-14 |
US20090171496A1 (en) | 2009-07-02 |
EP2015205A4 (en) | 2010-11-10 |
JP2007293636A (ja) | 2007-11-08 |
AU2007244539A1 (en) | 2007-11-08 |
US7738990B2 (en) | 2010-06-15 |
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