JP2018176597A - Data generation device for three-dimensional creation, three-dimensional creation device, and path data generation program for three-dimensional creation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain gaps from overlapping in the laminating direction of a creation material when a three-dimensional shape is created using a three-dimensional creation method for creating a three-dimensional shape by continuously discharging a creation material along a contour set up on the basis of two-dimensional data of a sliced surface formed by slicing the three-dimensional shape data and by continuously discharging a creation material to the inside of the contour.SOLUTION: A path data generation device 10 for three-dimensional creation continuously discharges a creation material in accordance with a contour set up on the basis of two-dimensional data of a sliced surface formed by slicing three-dimensional data of a three-dimensional shape, and generates path data showing a discharging path of the creation material so that the creation material is continuously discharged to the inside of the contour. When the contours overlap each other in the laminating direction of the creation material, at least one of the number or a thickness of contours on at least one layer among layers with overlapped contours is modified.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a three-dimensional modeling route data generation apparatus, a three-dimensional modeling apparatus, and a three-dimensional modeling route data generation program.

  Patent Document 1 discloses a method of correcting a computer aided design model of a three-dimensional object, wherein the method comprises setting a limit wall width and providing at least one slice layer polyline of the computer aided design model. Providing at least one slice layer polyline, wherein the at least one slice layer polyline comprises a first portion and a second portion, and a first between the first portion and the second portion. Determining the distance, and providing the second distance between the first portion and the second portion if the first distance is less than the limit wall width; Adjusting the position of the two parts, wherein the second distance is approximately equal to or greater than the limit wall width, of the first and second portions The method comprises the adjusting the location, is disclosed.

  U.S. Pat. No. 5,959,015 describes a method of forming a three-dimensional object using an extrusion-based layered deposition system, generating a build path defining a void area to build up a layer of the three-dimensional object; A method is disclosed comprising the steps of generating at least one intermediate path in the void area and generating a remaining path based at least in part on said at least one intermediate path.

JP-A-2010-533086 Japanese Patent Application Publication No. 2009-525207

  The present invention continuously discharges a modeling material according to an outline set based on two-dimensional data of a sliced surface obtained by slicing three-dimensional shape data, and continuously discharges the modeling material inside the outline. A three-dimensional modeling data generation apparatus capable of suppressing a gap from overlapping in a stacking direction of modeling materials when modeling a three-dimensional shape using a three-dimensional modeling method of modeling a three-dimensional shape An object of the present invention is to provide an apparatus and a three-dimensional modeling route data generation program.

  In order to achieve the above object, the invention of a three-dimensional modeling data generation apparatus according to claim 1 is an outline set based on two-dimensional data of a sliced surface obtained by slicing three-dimensional shape data of a three-dimensional shape. And a generation unit that generates path data representing a discharge path of the modeling material so that the modeling material is continuously discharged according to the shape line, and the modeling material is continuously discharged to the inside of the contour line; A changing unit that changes the ejection path by changing at least one of the number and thickness of at least one of the layers in which the outlines overlap, when the outlines overlap in the stacking direction of the layers; Equipped with

  In the invention according to claim 2, the changing unit changes at least one of the number and the thickness of the outlines of the layers at both ends in the stacking direction among the layers in which the outlines overlap.

  The three-dimensional modeling apparatus of the invention according to a third aspect of the present invention is a discharge unit for discharging a modeling material, and the three-dimensional modeling path data generated by the three-dimensional modeling data generation apparatus according to the first or second aspect. It has an acquisition part to acquire, and a control part which controls the discharge part so that the modeling material may be discharged according to the path data for three-dimensional modeling acquired by the acquisition part.

  In the invention according to claim 4, when the control unit is continuously discharged the modeling material into the contour line, the amount of the modeling material to be discharged at the folded portion of the discharge path is The amount of discharge of the modeling material by the discharge unit is controlled so as to be larger than the modeling material discharged in a portion other than the folded portion.

  In the invention according to claim 5, when the shaping material is continuously discharged to the inside of the outline, the control unit is the layer of the layers at both ends in the stacking direction among the layers in which the outline overlaps. The amount of discharge of the modeling material by the discharge unit is controlled such that the amount of the modeling material discharged in the folded portion of the discharge path is larger than the amount of the modeling material discharged in the portion other than the folded portion.

  In the invention according to claim 6, in the control unit, when the modeling material is continuously discharged into the inside of the outline, the amount of the modeling material discharged in the folded portion of the discharge path is Control is performed to slow the moving speed of the discharge portion so that the amount of the material to be discharged is larger than that of the portion other than the folded portion.

  In the invention according to claim 7, when the shaping material is continuously discharged to the inside of the outline, the control unit is the layer of the layers at both ends in the stacking direction among the layers in which the outline overlaps. The moving speed of the discharge portion is controlled to be slow so that the amount of the modeling material discharged in the folded portion of the discharge path is larger than the amount of the modeling material discharged in the portion other than the folded portion.

  The route data generation program for three-dimensional modeling of the invention according to claim 8 generates route data for three-dimensional modeling for causing the computer to function as each unit of the data creation apparatus for three-dimensional modeling according to claim 1 or 2 It is a program.

  According to the first, third, and eighth aspects of the present invention, the forming material is continuously discharged in accordance with the contour line set based on the two-dimensional data of the slice plane obtained by slicing the three-dimensional shape data. When forming a three-dimensional shape using a three-dimensional forming method of forming a three-dimensional shape by continuously discharging the forming material into the inside, it is possible to suppress that a gap overlaps in the stacking direction of the forming material It has an effect of.

  According to the second aspect of the present invention, a minute hole is formed as compared with the case where at least one of the number and thickness of contour lines other than the layers at both ends in the stacking direction among the layers where the contour lines overlap is changed. It has the effect of being suppressed.

  According to the fourth aspect of the present invention, the formation of minute holes is suppressed as compared with the case where the discharge amount of the modeling material is made the same between the folded portion of the discharge path and the portion other than the folded portion. Have the effect of

  According to the fifth aspect of the present invention, the discharge amount is increased so that the amount of the modeling material to be discharged in the turn-back portion of the discharge path is increased for the layers other than the layers at both ends in the stacking direction among the layers where the outlines overlap. As compared with the case of control, it is possible to reduce the clearance of the three-dimensional shaped surface.

  According to the sixth aspect of the present invention, the formation of a minute hole is suppressed as compared with the case where the moving speed of the discharge portion is made the same between the folded portion of the discharge path and the portion other than the folded portion. Have the effect of

  According to the seventh aspect of the present invention, in the layer where the outline overlaps, the layers other than the layers at both ends in the stacking direction are such that the amount of the modeling material discharged in the folded portion of the discharge path is increased. As compared with the case of reducing the moving speed, it is possible to reduce the gap between the surfaces of the three-dimensional shape.

It is a figure which shows the structural example of the production | generation apparatus of the path | route data for three-dimensional modeling. It is a figure which shows an example of a three-dimensional shape. It is a flow chart which shows an example of a flow of generation processing of course data for three-dimensional modeling. It is a perspective view which shows an example of a three-dimensional shape. It is a side view showing an example of a three-dimensional shape. It is a figure for demonstrating the path | route data for three-dimensional modeling. It is a figure for demonstrating the path | route data for three-dimensional modeling at the time of increasing the number of outlines to two. It is a figure which shows the structural example of a three-dimensional modeling apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, with reference to FIG. 1, the structure of the production | generation apparatus 10 of the path | route data for three-dimensional modeling which concerns on this Embodiment is demonstrated.

  The generation device 10 is configured of, for example, a personal computer, and includes the controller 12. The controller 12 includes a central processing unit (CPU) 12A, a read only memory (ROM) 12B, a random access memory (RAM) 12C, a non-volatile memory 12D, and an input / output interface (I / O) 12E. The CPU 12A, the ROM 12B, the RAM 12C, the non-volatile memory 12D, and the I / O 12E are connected to one another via the bus 12F.

  Further, the I / O 12E is connected to the operation unit 14, the display unit 16, the communication unit 18, and the storage unit 20. The CPU 12A is an example of a generation unit and a change unit.

  The operation unit 14 includes an input device such as a mouse, a keyboard, and a touch panel that receives an instruction from the user of the generation device 10.

  The display unit 16 includes, for example, display devices such as a liquid crystal display and an organic EL (Electro Luminescence) display.

  The communication unit 18 is connected to a communication line such as the Internet and a LAN (Local Area Network), for example, and has an interface for performing data communication with an external device such as a personal computer connected to the communication line.

  The storage unit 20 is configured by a non-volatile storage device such as a hard disk, and stores a generation program of three-dimensional modeling path data, which will be described later, three-dimensional shape data, and the like. The CPU 12A reads and executes a generation program of three-dimensional modeling route data stored in the storage unit 20.

  FIG. 2 is a view showing an example of a three-dimensional shape 32 represented by three-dimensional shape data. As shown in FIG. 2, the generator 10 represents a three-dimensional shape 32 using a three-dimensional coordinate space represented by orthogonal X, Y, and Z axes.

  In the present embodiment, as a data format of three-dimensional shape data, a data format in which the three-dimensional shape 32 is represented by a set of voxels 34 is used, but other data format may be used.

  Here, the voxel 34 is a basic element of the three-dimensional shape 32. For example, a rectangular parallelepiped is used, but not limited to a rectangular parallelepiped, a sphere or a cylinder may be used. The desired three-dimensional shape 32 is represented by stacking the voxels 34. Further, in each voxel 34, an attribute representing the property of the voxel 34 such as color, intensity, material, texture, etc. is designated, and the color or material of the three-dimensional shape 32 is determined by the presence or absence of the voxel 34 and the attribute of the voxel 34. Etc. are expressed. Hereinafter, the color designated as the attribute of the voxel 34 is referred to as color information.

  Here, the "material" is information representing the genre of the material such as resin, metal, rubber, information representing the material name such as ABS or PLA, information representing the trade name of the commercially available material, product number, etc. It includes at least one piece of information indicating material names, abbreviations, numbers and the like defined by standards such as ISO and JIS, and information indicating material characteristics such as thermal conductivity, conductivity, magnetism and the like.

  Further, the "texture" includes not only the color but also an attribute representing an appearance or touch, in addition to the reflectance, transmittance, gloss, surface property and the like of the three-dimensional shape data.

  Note that the attribute includes an attribute pattern set using at least one information of a period, a mathematical expression, and other three-dimensional shape data. The attribute pattern is to continuously change the color, material, texture, etc. of the three-dimensional shape data according to repetition of a constant cycle, gradation, expression represented by a slope or a mathematical expression, other three-dimensional shape data, etc. Filling or continuously changing the indicated range of the three-dimensional shape data with the indicated shape.

  As described above, the three-dimensional shape 32 is represented by a set of voxels 34. Specifically, for example, it is represented by an element value n of X, Y, Z coordinates in a three-dimensional coordinate space. Here, n is an integer of 0 or more. If coordinates in the three-dimensional coordinate space are represented by (X, Y, Z), n is an integer of 1 or more when voxels 34 exist at the coordinates (X, Y, Z). On the other hand, n is 0 if voxels 34 do not exist at the coordinates (X, Y, Z). Thereby, a three-dimensional shape 32 is represented.

  When n is 1 or more, n represents an attribute of a voxel. For example, in the case of n = 2, it indicates that the material of the voxel is A and the color is red, and if n = 3, it indicates that the material is B and the color is green, and so on. That is, the value of n and the attribute of the voxel correspond one to one.

  Further, the shape of the three-dimensional shape 32 is not limited, and may be any shape as long as it is a shape represented using three-dimensional shape data.

  In the present embodiment, the molding material is continuously discharged in accordance with the outline that defines the outer surface of the three-dimensional shape set based on the two-dimensional data of the sliced surface obtained by slicing the three-dimensional shape data. When forming a three-dimensional shape by using a three-dimensional forming method of forming a three-dimensional shape by continuously discharging the forming material into the inside of the three-dimensional forming route data defining a path for discharging the forming material The case of generating. The three-dimensional formation route data is, for example, data including a discharge route of the formation material and a thickness of the formation material.

  As a three-dimensional modeling method as described above, that is, a three-dimensional modeling method in which a three-dimensional shape is modeled by continuously discharging a modeling material like one-stroke writing, for example, a thermoplastic resin is melted and laminated to form three-dimensional Although there are a hot melt lamination method (FDM: Fused Deposition Modeling) etc. which model a shape, it is not restricted to this.

  Next, with reference to FIG. 3, an operation of the generation device 10 according to the present embodiment will be described. The CPU 12A reads and executes a generation program for three-dimensional modeling route data, whereby the generation process shown in FIG. 3 is executed. The generation process illustrated in FIG. 3 is executed, for example, when execution of a generation program is instructed by a user operation.

  In the present embodiment, in order to simplify the description, the case of generating path data for three-dimensional shaping of a three-dimensional shape 40 of a rectangular parallelepiped as shown in FIG. 4 will be described.

  In step S100, three-dimensional shape data is read from the storage unit 20.

  In step S102, slice data (two-dimensional data) is generated based on the three-dimensional shape data. Specifically, as shown in FIG. 5, a plane parallel to the ground plane (XY plane) to which the three-dimensional shape 40 is grounded is set as the slice plane S, and the three-dimensional shape 40 is predetermined in the Z axis Slice data is generated by slicing at an interval d. The generated slice data is data representing the outline of the three-dimensional shape 40 in the slice plane S.

  In step S104, voxel data is generated by converting the slice data generated in step S102 into voxel data. The voxel data is data representing the three-dimensional shape 40 by voxels of a predetermined shape such as a rectangular parallelepiped, for example. Therefore, in step S104, the area surrounded by the outline represented by the slice data generated in step S102 is divided into a plurality of voxels.

  In step S106, based on the slice data generated in step S104, path data representing a discharge path of the build material is generated.

  In the present embodiment, since a three-dimensional forming method of forming a three-dimensional shape by continuously discharging the forming material like one-stroke writing is used, the outline of the discharge area where the forming material is discharged based on the slice data. And a path for continuously discharging the forming material to the inside of the obtained outline and the outline.

  In the case of the three-dimensional shape 40 shown in FIG. 5, the shape in the XY plane when sliced on the slice surface S is rectangular. In this case, as shown in FIG. 6, the path 52A in which the build material 50 is continuously discharged according to the outline of the three-dimensional shape 40, and the build material 50 is continuously discharged while being folded back inside the outline. Path data representing the path 52 including the path 52B is generated.

  By the way, as shown in FIG. 6, a gap 54 in which no modeling material exists is generated between the modeling material 50 discharged along the path 52A and the modeling material 50 discharged along the path 52B.

  In the case of a rectangular parallelepiped such as the three-dimensional shape 40, the two-dimensional shape in each slice plane is the same rectangular shape. In this case, since the gaps 54 of the respective layers occur at the same position, the plurality of minute holes are formed in the three-dimensional shape 40 by the gaps 54 of the plurality of layers overlapping in the stacking direction of the modeling material, that is, the Z axis direction. It will

  Therefore, in step S108, it is determined whether or not there is a layer in which the outlines overlap in the stacking direction of the forming materials, and if it exists, the process proceeds to step S110, and if it does not exist, the process proceeds to step S112.

  In step S110, at least one of the number and thickness of the outline of at least one layer of the layers where the outlines overlap is changed.

  For example, the contour of the top layer is increased to two in the Z direction, and the contours of the other layers are left alone. In this case, as shown in FIG. 7, the path 56A in which the build material 50 is continuously discharged in accordance with the two increased outlines, and the form material 50 is continuously discharged while being folded back inside the outline. Path data is generated that is representative of the path 56 that includes the path 56B. Also, for layers other than the top layer, path data representing the path 52 shown in FIG. 6 is generated.

  Thereby, as shown in FIG. 7, the position in the XY plane of the gap 58 generated between the modeling material 50 discharged along the path 56A and the modeling material 50 discharged along the path 56B is It does not overlap with the position in the XY plane of the gap 54 shown in FIG. For this reason, formation of a plurality of minute holes in the three-dimensional shape 40 is suppressed.

  In addition, the number of outlines of not only the top layer but the bottom layer may be increased similarly to the top layer. Also, for example, the thickness of the contour line of the top layer may be thicker than that of other layers. Thereby, the position of the gap generated in the uppermost layer in the XY plane and the position in the XY plane of the gaps generated in the layers other than the uppermost layer are different, and a plurality of minute holes are formed in the three-dimensional shape 40 Be suppressed. Also in this case, not only the thickness of the top layer, but also the thickness of the lowermost layer may be made the same as the thickness of the top layer.

  In step S112, the three-dimensional modeling route data generated by performing the above-described processing is stored in the storage unit 20.

  As described above, in the present embodiment, when there is a layer in which the outlines overlap in the stacking direction of the modeling material, at least one of the number and the thickness of the outlines of at least one layer is changed among the layers in which the outlines overlap. Do. Thereby, the gaps overlap in the stacking direction of the modeling material, and the formation of minute holes is suppressed.

  Next, a three-dimensional modeling apparatus for modeling a three-dimensional shape using the three-dimensional modeling route data generated by the three-dimensional modeling route data generation apparatus 10 will be described.

  In FIG. 8, the structure of the three-dimensional modeling apparatus 100 which concerns on this Embodiment was shown. As shown in FIG. 12, the three-dimensional modeling apparatus 100 includes a discharge head 102, a discharge head drive unit 104, a modeling table 106, a modeling table drive unit 108, an acquisition unit 110, and a control unit 112.

  The discharge head 102 as an example of the discharge unit discharges a forming material for forming the three-dimensional shape 40. The ejection head 102 is driven by the ejection head driving unit 104, and is two-dimensionally scanned on the XY plane.

  The forming table 106 is driven by the forming table drive unit 108 and is moved up and down in the Z-axis direction.

  The acquisition unit 110 acquires the three-dimensional formation path data generated by the three-dimensional formation path data generation device 10.

  The control unit 112 drives the discharge head driving unit 104 to two-dimensionally scan the discharge head 102 so that the modeling material is discharged according to the three-dimensional modeling route data acquired by the acquisition unit 110, and the discharge head 102. Control the discharge of the molding material.

  In addition, the control unit 112 drives the forming table driving unit 108 to lower the forming table 106 by a predetermined interval d each time the formation of each layer is finished.

  Here, the three-dimensional modeling path data generated by the three-dimensional modeling path data generation apparatus 10 is a third order in which at least one of the number and thickness of the contour lines of at least one layer in the layers where the contour lines overlap is changed. It is route data for original modeling. For this reason, it is suppressed that the gap generated between the modeling material discharged along the contour line and the modeling material discharged while being folded back to the inside of the contour line overlaps in the stacking direction, and the minute holes are small. It is suppressed from being formed.

  Note that the acquiring unit 110 may acquire three-dimensional modeling route data in which at least one of the number and the thickness of at least one of the outlines of the overlapping layers is not changed. That is, the three-dimensional modeling path data generated in step S106 of FIG. 3 may be acquired.

  In this case, when the molding material is continuously discharged into the outline, the control unit 112 is configured to discharge the amount of the molding material discharged in the folded portion of the discharge path in a portion other than the folded portion. The discharge amount of the modeling material by the discharge head 102 may be controlled so as to be larger than the material (first control). The control of the discharge amount may be performed, for example, by changing the discharge pressure, or may be performed by raising the temperature of the shaping material to lower the viscosity. Thus, as compared with the case where the amount of the forming material discharged in the return portion of the discharge path and the amount of the forming material discharged in the other portion are the same, the shape discharged along the contour line The gap generated between the material and the ejected molding material while being folded back inside the contour line becomes smaller, and the formation of minute holes is suppressed. In addition, when the first control described above is applied to the layers at both ends in the stacking direction among the layers in which the outlines overlap, the gap generated on the surface is reduced.

  In addition, when the molding material is continuously discharged into the outline, the control unit 112 is a molding material in which the amount of the molding material discharged in the return portion of the discharge path is discharged in a portion other than the return portion. The moving speed of the ejection head 102 may be controlled to be slower (second control) so as to be higher than the above. As a result, as compared with the case where the moving speed of the discharge head is made the same between the folded portion of the discharge path and the portion other than the folded portion, it is folded back inside the molding material and the contour line discharged along the contour line. The gap generated between the material and the discharged molding material is reduced, and the formation of a minute hole is suppressed. In addition, when the control for reducing the moving speed of the ejection head 102 described above is applied to the layers at both ends in the stacking direction among the layers in which the outlines overlap, the gap generated on the surface is reduced.

  In addition, three-dimensional modeling route data in which at least one of the number and the thickness of at least one of the outlines of the overlapping layers is changed is acquired, and the first control or the second control is performed. It may be performed. Thereby, the gap generated between the modeling material discharged along the contour line and the modeling material discharged while being folded back to the inside of the contour line is further reduced, and the formation of minute holes is further suppressed Be done.

  As mentioned above, although this invention was demonstrated using each embodiment, this invention is not limited to the range as described in each embodiment. Various changes or improvements can be added to each embodiment without departing from the scope of the present invention, and a form to which the changes or improvements are added is also included in the technical scope of the present invention.

  For example, the process of generating the route data for three-dimensional formation shown in FIG. 3 may be realized by hardware such as an application specific integrated circuit (ASIC). In this case, the processing speed can be increased as compared to the case of software implementation.

  Moreover, although the form by which the production | generation program of the path | route data for three-dimensional modeling was installed in ROM12B was demonstrated by each embodiment, it is not limited to this. The generation program of the path data for three-dimensional modeling according to the present embodiment may be provided in the form of being recorded in a computer readable storage medium. For example, a form in which a program for generating route data for three-dimensional modeling according to the present invention is recorded on an optical disc such as a CD (Compact Disc) -ROM and a DVD (Digital Versatile Disc) -ROM, or a USB (Universal Serial Bus) memory and You may provide in the form recorded on semiconductor memory, such as a memory card. In addition, the generation program of the route data for three-dimensional modeling according to the present embodiment may be acquired from the external device via the communication line connected to the communication unit 18.

DESCRIPTION OF SYMBOLS 10 Three-dimensional modeling route data generation device 12 Controller 14 Operation unit 16 Display unit 18 Communication unit 20 Memory unit 32 Three-dimensional shape 34 Voxel 40 Three-dimensional shape 50 Modeling material 52, 56 Pathway 54, 58 Clearance 100 Three-dimensional modeling device 102 Ejection head 104 Ejection head drive unit 106 Modeling table 108 Modeling table drive unit 110 Acquisition unit 112 Control unit

Claims (8)

The forming material is continuously discharged in accordance with the outline set based on the two-dimensional data of the sliced surface obtained by slicing the three-dimensional shape data of the three-dimensional shape, and the forming material is continuously formed inside the outline. A generation unit that generates path data representing an ejection path of the modeling material so as to be ejected;
When the outlines overlap in the stacking direction of the modeling material, a changing unit that changes at least one of the number and thickness of the outlines of at least one layer of the layers in which the outlines overlap;
3D modeling data generator equipped with The three-dimensional modeling data generation apparatus according to claim 1, wherein the changing unit changes at least one of the number and thickness of the outlines of the layers at both ends in the stacking direction among the layers where the outlines overlap. A discharge unit that discharges the modeling material;
An acquisition unit for acquiring route data for three-dimensional formation generated by the data generation apparatus for three-dimensional formation according to claim 1 or 2;
A control unit configured to control the discharge unit such that the modeling material is discharged according to the three-dimensional modeling route data acquired by the acquisition unit;
3D modeling device equipped with The control unit is configured to discharge the amount of the modeling material discharged at the turnback portion of the discharge path at a portion other than the turnback portion when the modeling material is continuously discharged inside the outline. The three-dimensional forming apparatus according to claim 3, wherein the discharge amount of the forming material by the discharge unit is controlled so as to be larger than the forming material. The control unit is configured to discharge at a turn-back portion of the discharge path of the layers at both ends in the stacking direction among the layers on which the outline overlaps, when the modeling material is continuously discharged inside the outline. The three-dimensional modeling apparatus according to claim 4, wherein the discharge amount of the modeling material by the discharge unit is controlled such that the amount of the modeling material is larger than that of the modeling material discharged in a portion other than the folded portion. . The control unit is configured to discharge the amount of the modeling material discharged at the turnback portion of the discharge path at a portion other than the turnback portion when the modeling material is continuously discharged inside the outline. The three-dimensional shaping apparatus according to claim 3, wherein the moving speed of the discharge unit is controlled to be slower than the shaping material. The control unit is configured to discharge at a turn-back portion of the discharge path of the layers at both ends in the stacking direction among the layers on which the outline overlaps, when the modeling material is continuously discharged inside the outline. The three-dimensional shaping apparatus according to claim 6, wherein the moving speed of the discharge unit is controlled to be slow so that the amount of the shaping material is larger than that of the shaping material discharged in the portion other than the folded portion.   A three-dimensional modeling path data generation program for causing a computer to function as each unit of the three-dimensional modeling data generation apparatus according to claim 1 or 2.