KR102305843B1 - Method and apparatus for generating slice data of 3d printer - Google Patents

Abstract

The present invention relates to a method and an apparatus for generating slice data of a 3D printer. The apparatus for generating slice data of a 3D printer of the present invention comprises: a memory which stores 3D modeling data; and a control unit which is connected to the memory, converts the 3D modeling data that has been stored therein into face buffer data, scans a face based on the face buffer data so as to retrieve the lowest height and highest height of the slice, designates the scope of a slice according to the face scan result, corrects an overlapping face for the specified slice scope, and then executes a slicing operation based on the modified face.

Description

Method and apparatus for generating slice data of a 3D printer

The present invention relates to a method for generating data, and more particularly, to a method and apparatus for generating slice data of a 3D printer.

3D printing refers to a technology that creates three-dimensional objects by injecting various raw materials based on data designed in three dimensions. 3D printing, called the third industrial revolution, is expected to bring about revolutionary industrial innovation by changing the technological paradigm in several fields, including manufacturing.

Methods for making three-dimensional objects include the additive manufacturing (AM) manufacturing method, which manufactures three-dimensional objects by stacking specific solid materials layer by layer, and the subtractive manufacturing method, which cuts or cuts the three-dimensional object through machining. Manufacturing) is divided into manufacturing methods. The cutting manufacturing method is usually called a 4-axis or 5-axis processing machine, and since it has already been commercialized and widely used in industrial fields, the technology mainly used in 3D printers refers to the additive manufacturing method.

Additive manufacturing methods are classified according to the method of operation or material. The FDM (Fused Deposition Modeling) method is a method that melts a plastic material and sprays it from a nozzle to laminate it. The SLS (Selective Laser Sintering) method is a method of manufacturing a product by thinly spreading a powder material on the field and sintering only the selected part with a laser, and has advantages such as high precision and use of various raw materials. In addition, the 3DP (3 Dimension Printing) method is similar to the SLS method, where the powder material is thinly spread, but it is hardened by spraying an adhesive instead of a laser. In addition, there are a LOM (Laminated Object Manufacturing) method using a metal material and a DLP (Digital Light Processing) method using a photocurable resin.

3D printing proceeds through 3D modeling, STL (Standard Tessellation Language) or AMF (Additive Manufacturing Format) file conversion, image data conversion, and physical printing using a host.

3D modeling is the step of constructing the shape of an object in three dimensions using CAD (Computer Aided Design) software, animation modeling software such as Maya and MAX, and medical data such as 3D scanner, CT, and MRI. Thereafter, the 3D modeling data must be converted into a file in the form of mesh data such as STL and OBJ for designing the additive process of 3D printing. File conversion to mesh data is supported by popular CAD software.

The converted mesh data file is converted into face buffer data using various slicer programs. The converted face buffer data is finally converted into image data or image data and path data. That is, the slicer program slices 3D modeling data received from CAD software or the like, and then converts it into image data or image data and path data.

On the other hand, 3D printers require a supporter, which is an object that fixes the output so that it does not deviate from its intended position while 3D printing is in progress. At this time, while the 3D model is being generated, since the supporter must fix the 3D model, the 3D model and the supporter come into contact with each other, and as shown in FIG. 1 , the overlapping area where the supporter 310 and the 3D model 320 overlap each other (130) will occur.

FIG. 2 is a diagram illustrating a slice screen of a 3D model and a supporter in contact with each other of FIG. 1 . Specifically, FIG. 2A shows an intended slice screen, and FIG. 2B shows an actual slice screen.

Referring to (a) of FIG. 2 , cross-sectional views II-I, II-II, and III-III of the 3D model and the supporter in contact with each other of FIG. 1 are shown in order from the top. As shown in the cross-sectional view II-II of FIG. 2A , in the intended slice screen, the area 210 indicated by the dotted line is the excluded area.

However, as described above, since the overlapping region 130 occurs between the supporter 310 and the 3D model 320 that are in contact with each other, as shown in FIG. A region 210 that is included is displayed as an included region. As a result, an error occurs in that the overlapping region 130 is not recognized during the slicing process, resulting in the opposite result.

Domestic Patent Publication No. 10-2018-0101732 Domestic Patent Publication No. 10-2018-0067389

The present specification has been devised to solve the above-described problems, and a method for generating slice data of a 3D printer that can prevent an error from not recognizing an overlapping region of a supporter and a 3D model in the slicing process of the 3D model, and The purpose is to provide a device.

According to an embodiment of the present specification, for achieving the above object, an apparatus for generating slice data of a 3D printer according to the present specification includes: a memory for storing 3D modeling data; and the 3D modeling data connected to the memory is converted into face buffer data, and the face is scanned based on the face buffer data to search for the lowest height of the slice and the highest height of the slice. and a control unit for specifying a slice range according to the slice range, correcting face overlap for the specified slice range, and executing a slicing operation based on the modified face.

Preferably, when several models exist as a result of examining face overlap, the control unit combines several models into one.

Preferably, the control unit extracts the face buffer data included between the height of the previous slice and the height of the current slice from the face buffer, and the position value of the triangle data constituting the image data of each slice, the height of the previous slice, and the current By comparing the height of each slice, the position of the pixel to be changed is extracted from the image buffer in which the position value of each pixel constituting the image data is stored, the image color is set at the position of the extracted pixel, and the image buffer is converted into an image file It is characterized in that it is stored as

Preferably, the control unit sets the exclusion area when the face direction is upward, and sets the exclusion area when the face direction faces other directions, and then sets the extracted area in consideration of the inclusion area and exclusion area of the triangle data. It is characterized in that the image color is set at the position of the pixel.

Preferably, the controller maintains the allocation of the image buffer until the slicing is finished.

According to another embodiment of the present specification, a method for generating slice data of a 3D printer according to the present specification includes, by an apparatus for generating slice data of a 3D printer, converting 3D modeling data into face buffer data; scanning, by the apparatus for generating slice data of the 3D printer, a face based on the face buffer data to search for a lowest height of a slice and a highest height of a slice; specifying, by the apparatus for generating slice data of the 3D printer, a slice range according to a face scan result; modifying, by the apparatus for generating slice data of the 3D printer, face overlap for a specified slice range; and executing, by the apparatus for generating slice data of the 3D printer, a slicing operation based on the corrected pace.

Preferably, in the step of correcting the face overlap, the slice data generating apparatus of the 3D printer combines several models into one when there are several models.

Preferably, in the step of correcting the face overlap, the slice data generating apparatus of the 3D printer calculates which direction the face faces in space according to the order of points stored in the face buffer data.

Preferably, in the step of correcting the overlapping of faces, the slice data generating apparatus of the 3D printer cuts off boundary faces overlapping each other and removes faces corresponding to the inside of each other, thereby calculating face data that correctly expresses the outline characterized.

Preferably, the executing of the slicing operation comprises: determining, by the apparatus for generating slice data of the 3D printer, whether the current slice value is equal to the total number of slices; extracting, by the apparatus for generating slice data of the 3D printer, a face included between a height of a previous slice and a height of a current slice from a face buffer when it is determined that the current slice value is different from the total number of slices; and executing, by the device for generating slice data of the 3D printer, a partial rendering operation on the extracted face, until the device for generating slice data of the 3D printer equals the current slice value to the total number of slices. The step of determining whether the current slice value is equal to the total number of slices or the step of executing the partial rendering operation may be repeatedly performed.

Preferably, in the step of setting the image color at the position of the extracted pixel, the slice data generating apparatus of the 3D printer sets the image color only at the position of the pixel that is allowed to change.

According to another embodiment of the present specification, an apparatus for generating slice data of a 3D printer according to the present specification includes: a memory for storing 3D modeling data; and the 3D modeling data connected to the memory is converted into face buffer data, and the face is scanned based on the face buffer data to search for the lowest height of the slice and the highest height of the slice. Specifies the slice range according to the specified slice range, and creates multiple image buffers equal to the number of image pixels in each slice * the total number of slices for the specified slice range, and the image buffer corresponding to the minimum height of the slice and the image buffer corresponding to the maximum height of the slice After setting all values corresponding to between the values as rendering targets, the control unit converts the image buffer of the corresponding range into an image file and stores the converted image file.

As described above, according to the present specification, by providing a method and an apparatus for generating slice data of a 3D printer that conducts face overlap inspection in advance, it is possible to reduce the amount of fatal computation at the overlapping position.

In addition, by providing a method and apparatus for generating slice data of a 3D printer that does not process the buffer into another buffer or do not require repeated scanning, the calculation time does not increase sensitively according to the size of 3D modeling data. As a result, the calculation process is relatively simple, and high-speed computing using a graphics processing unit (GPU) can be optimized.

1 is a view showing a state in which a 3D model is fixed by a supporter;
Figure 2 is a view showing a slice screen of the 3D model and the supporter in contact with each other of Figure 1;
3 is a block diagram showing a schematic configuration of the inside of the slice data generating apparatus of the 3D printer according to the first embodiment of the present invention;
4 is a flowchart showing a slicing method in consideration of the overlapping portion of the model according to the first embodiment of the present invention;
5 is a flowchart illustrating a slicing operation method according to a first embodiment of the present invention;
6 is a flowchart illustrating a partial rendering operation method of a 3D model according to a first embodiment of the present invention;
7 is a block diagram showing a schematic configuration of the inside of a slice data generating apparatus of a 3D printer according to a second embodiment of the present invention;
8 is a flowchart illustrating a slicing method in consideration of overlapping regions of a model according to a second embodiment of the present invention;
9 is a flowchart illustrating a parallel slicing operation method according to a second embodiment of the present invention, and
10 is a flowchart illustrating a method of performing a parallel slicing operation by the number of image pixels according to the second embodiment of the present invention.

It should be noted that the technical terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. In addition, the technical terms used in this specification should be interpreted in the meaning generally understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise defined in this specification, and excessively inclusive. It should not be construed in the meaning of a human being or in an excessively reduced meaning. In addition, when the technical terms used in the present specification are incorrect technical terms that do not accurately express the spirit of the present invention, they should be understood by being replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to the context before and after, and should not be interpreted in an excessively reduced meaning.

Also, as used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

In addition, the suffixes "module" and "part" for the components used in this specification are given or mixed in consideration of the ease of writing the specification, and do not have distinct meanings or roles by themselves.

Also, terms including an ordinal number such as first, second, etc. used herein may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

3 is a block diagram showing a schematic configuration of the inside of the slice data generating apparatus of the 3D printer according to the first embodiment of the present invention.

Referring to FIG. 3 , the slice data generating apparatus 300 of the 3D printer according to the first embodiment of the present invention includes a memory 310 , a loading unit 320 , a conversion unit 330 , a face buffer 332 , and a slice It may include a range designation unit 340 , a face overlap inspection unit 350 , a pixel position extraction unit 360 , an image buffer 362 , and an image color setting unit 370 . Here, the loading unit 320 , the conversion unit 330 , the face buffer 332 , the slice range designation unit 340 , the face overlap inspection unit 350 , the pixel position extraction unit 360 , the image buffer 362 , and The image color setting unit 370 may be configured as a single control unit.

The memory 310 stores 3D modeling data and image files. Also, the memory 310 may store a slice range designated by the slice range designation unit 340 .

The memory 310 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory), and a RAM. (RAM, Random Access Memory) SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory) magnetic memory, magnetic disk, It may include at least one type of storage medium among optical disks. In addition, the slice data generating apparatus 300 of the 3D printer may operate a web storage that performs a storage function of the memory 310 on the Internet.

The loading unit 320 loads 3D modeling data from the memory 310 .

The conversion unit 330 converts the 3D modeling data retrieved from the memory 310 through the loading unit 320 into phase buffer data and stores the converted 3D modeling data in the phase buffer 332 . Here, the face buffer data represents the coordinate values of the vertices with respect to the faces constituting the 3D model.

The slice range designation unit 340 scans the face buffer 332 to search for the lowest height (Z minimum value) and the highest slice height (Z maximum value) of the slice by scanning the face buffer 332 , and the slice range according to the scan result of the face buffer 332 . specify

The face overlap test unit 350 checks the face overlap with respect to the slice range designated by the slice range designation unit 340 and corrects a face corresponding to the overlapped space. In this case, when there are several models, the face overlap inspection unit 350 may combine several models into one.

As such, since the slice data generating apparatus 300 of the 3D printer according to the first embodiment of the present invention performs the face overlap test in advance, it is possible to reduce the fatal computation amount at the overlapping position.

The pixel position extractor 360 extracts the face buffer data included between the height Za of the previous slice and the height Zb of the current slice from the face buffer 332 , and triangle data constituting the image data of each slice. The position of the pixel to be changed is extracted from the image buffer 362 in which the position value (x, y) of each pixel constituting the image data is stored by comparing the position value of , the height of the previous slice and the height of the current slice, respectively.

Then, the image color setting unit 370 sets an exclusion area when the face direction is up (z+), and sets it as an inclusion area when the face direction faces other directions, and then sets the inclusion area and exclusion area of the triangle data. In consideration of , an image color is set at the position of the corresponding pixel, and the image buffer 362 is stored as an image file. Here, the image color setting unit 370 sets the image color only at positions of pixels that are allowed to be changed. Also, the image color setting unit 370 maintains the allocation of the image buffer 362 until the slicing is finished.

As such, since the slice data generating apparatus 300 of the 3D printer according to the first embodiment of the present invention does not process the buffer into another buffer or does not require repeated scanning, the calculation time is sensitive depending on the size of the 3D modeling data. does not increase significantly In addition, the slice data generating apparatus 300 of the 3D printer according to the first embodiment of the present invention can optimize high-speed computing using a graphics processing unit (GPU) because the calculation process is relatively simple.

4 is a flowchart illustrating a slicing method in consideration of overlapping regions of a model according to the first embodiment of the present invention.

Referring to FIG. 4 , the slice data generating apparatus 300 of the 3D printer converts 3D modeling data into face buffer data and stores it in the face buffer 332 ( S410 ).

The slice data generating apparatus 300 of the 3D printer scans the face buffer 332 to search for a minimum height (Z minimum) and a maximum height (Z maximum) of a slice (S420).

The slice data generating apparatus 300 of the 3D printer designates a slice range according to the scan result of the face buffer 332 (S430).

The slice data generating apparatus 300 of the 3D printer checks the overlap of the faces for the specified slice range and corrects the faces corresponding to the overlapped space (S440). In this case, when there are several models, the slice data generating apparatus 300 of the 3D printer may combine several models into one.

Here, the slice data generating apparatus 300 of the 3D printer may calculate which direction the face faces in space according to the order of points stored in the face buffer data. Through this, the slice data generating apparatus 300 of the 3D printer may know whether the face is the back side or the front side of the object. As a result, the slice data generating apparatus 300 of the 3D printer may know whether a face representing another object exists inside a certain 3D object. Also, the slice data generating apparatus 300 of the 3D printer may detect overlapping portions of faces of different objects. Accordingly, the slice data generating apparatus 300 of the 3D printer cuts off boundary faces overlapping each other and removes faces corresponding to the inside of each other, thereby calculating face data that correctly expresses the outline.

Next, the slice data generating apparatus 300 of the 3D printer performs a slicing operation based on the corrected pace (S450).

5 is a flowchart illustrating a slicing operation method according to the first embodiment of the present invention.

Referring to FIG. 5 , the slice data generating apparatus 300 of the 3D printer designates a current slice value as 0 ( S510 ).

The slice data generating apparatus 300 of the 3D printer determines whether the current slice value is equal to the total number of slices (S520), and when it is determined that the current slice value is equal to the total number of slices, the slicing operation is terminated.

When the slice data generating apparatus 300 of the 3D printer determines that the current slice value is different from the total number of slices, the 3D printer slice data generating apparatus 300 selects a face included between the height Za and the height of the current slice from the face buffer 332 (Za). Extract (S530).

The slice data generating apparatus 300 of the 3D printer performs a partial rendering operation on the extracted face (S540).

Finally, the slice data generating apparatus 300 of the 3D printer increases the current slice value by 1 ( S550 ), and returns to step S520 .

6 is a flowchart illustrating a partial rendering operation method of a 3D model according to the first embodiment of the present invention.

Referring to FIG. 6 , the slice data generating apparatus 300 of the 3D printer compares the position value of the triangle data constituting the image data of each slice with the height of the previous slice and the height of the current slice, each composing image data. The position of the pixel to be changed is extracted from the image buffer 362 in which the position values (x, y) of the pixel are stored ( S610 ).

The slice data generating apparatus 300 of the 3D printer sets an exclusion region when the face direction is up (z+), and sets it as an inclusion region when the face direction faces other directions (S620).

The face is data representing the outer surface of a three-dimensional object (eg, a model, a supporter). And, one face is composed of three or more points.

As such, since the face is composed of three or more points, the direction of the face can be set using the order in which the points are stored.

On the other hand, there are two methods for setting the direction of the face.

First, if you promise in advance whether to save clockwise (CW) or counterclockwise (CCW) when viewed from the front, and save all face buffer data according to the rules, whether all faces are viewed from the front or from the back You can easily calculate what you are looking at.

Second, we have data (expressed as a vector) about the front or back direction in advance, so that we can easily calculate whether all faces are viewed from the front or from the back.

The slice data generating apparatus 300 of the 3D printer sets the image color at the position of the corresponding pixel in consideration of the inclusion and exclusion regions of the triangle data ( S630 ). In this case, the slice data generating apparatus 300 of the 3D printer sets the image color only at the position of the pixel for which the change is allowed.

Finally, the slice data generating apparatus 300 of the 3D printer stores the image buffer 362 as an image file (S640). Here, the slice data generating apparatus 300 of the 3D printer maintains the allocation of the image buffer 362 until the slicing is finished.

The above-described method may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of implementation by hardware, the method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). , FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers and microprocessors, and the like.

In the case of implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above. The software code may be stored in the memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may transmit and receive data to and from the processor by various known means.

7 is a block diagram showing a schematic configuration of the inside of the slice data generating apparatus of the 3D printer according to the second embodiment of the present invention.

Referring to FIG. 7 , an apparatus 700 for generating slice data of a 3D printer according to a second embodiment of the present invention includes a memory 710 , a loading unit 720 , a conversion unit 730 , a face buffer 732 , and a slice It may include a range designator 740 , an image buffer generator 750 , an image buffer 752 , and a parallel slicing operator 760 . Here, the loading unit 720 , the conversion unit 730 , the face buffer 732 , the slice range designation unit 740 , the image buffer generation unit 750 , the image buffer 752 , and the parallel slicing operation unit 760 are It may consist of one control unit. The slice data generating apparatus 700 of the 3D printer according to the second embodiment of the present invention does not require an error checking operation, that is, a face overlapping checking operation, unlike the slice data generating apparatus 300 of the 3D printer of FIG. 3 . .

The memory 710 stores 3D modeling data and image files. Also, the memory 710 may store a slice range designated by the slice range designation unit 740 .

The memory 710 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory), and a RAM. (RAM, Random Access Memory) SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory) magnetic memory, magnetic disk, It may include at least one type of storage medium among optical disks. In addition, the slice data generating apparatus 700 of the 3D printer may operate a web storage that performs a storage function of the memory 710 on the Internet.

The loading unit 720 loads 3D modeling data from the memory 710 .

The conversion unit 730 converts the 3D modeling data retrieved from the memory 710 through the loading unit 720 into phase buffer data and stores the converted 3D modeling data in the phase buffer 732 .

The slice range designation unit 740 scans the face buffer 732 to search for the lowest height (Z minimum value) and the highest slice height (Z maximum value) of the slice by scanning the face buffer 732 , and the slice range according to the scan result of the face buffer 732 . specify

The image buffer generation unit 750 generates a plurality of image buffers 752 as many as the number of image pixels (X, Y) * the total number of slices (Z) of each slice for the slice range specified by the slice range designation unit 740 . do.

The parallel slicing operation unit 760 scans the face buffer 732 to extract the face buffer data from the face buffer 732 , and the minimum height (Zmin) of the slice at the coordinates (x, y) of the extracted face buffer data and the slice Calculates the maximum height (Zmax) of the slice, the image buffer corresponding to the minimum height of the slice (image buffer[x][y][Zmin]) and the image buffer corresponding to the maximum height of the slice (image buffer[x][y]) ][Zmax]) is set as the rendering target, and the image buffer in the range is converted into an image file and saved.

8 is a flowchart illustrating a slicing method in consideration of overlapping regions of models according to a second embodiment of the present invention.

Referring to FIG. 8 , the apparatus 700 for generating slice data of the 3D printer converts 3D modeling data into face buffer data and stores it in the face buffer 732 ( S810 ).

The slice data generating apparatus 700 of the 3D printer scans the face buffer 732 to search for a minimum height (Z minimum) and a maximum height (Z maximum) of a slice (S820).

The slice data generating apparatus 700 of the 3D printer designates a slice range according to the scan result of the face buffer 732 (S830).

The slice data generating apparatus 700 of the 3D printer performs a parallel slicing operation on a specified slice range ( S840 ).

9 is a flowchart illustrating a parallel slicing operation method according to a second embodiment of the present invention.

Referring to FIG. 9 , the slice data generating apparatus 700 of the 3D printer generates a plurality of image buffers 752 as many as the number of image pixels (X, Y) * total number of slices (Z) of each slice for a specified slice range. do (S910).

The slice data generating apparatus 700 of the 3D printer performs a parallel slicing operation for each image buffer 752 by the number of image pixels (X, Y) ( S920 ).

The slice data generating apparatus 700 of the 3D printer converts the image buffer 752 into an image file and stores it (S930)

10 is a flowchart illustrating a method of performing a parallel slicing operation by the number of image pixels according to the second embodiment of the present invention.

Referring to FIG. 10 , the slice data generating apparatus 700 of the 3D printer designates a current scan value as 0 ( S1010 ).

The slice data generating apparatus 700 of the 3D printer determines whether the current scan value is equal to the total number of faces ( S1020 ), and when it is determined that the current scan value is equal to the total number of faces, the parallel slicing operation is terminated.

When it is determined that the current scan value is different from the total number of faces, the slice data generating apparatus 700 of the 3D printer determines whether the face to be scanned currently includes the coordinates (x, y) (S1030), and the current scan value is When it is determined that the coordinates (x, y) are included, the minimum height (Zmin) of the slice and the maximum height (Zmax) of the slice at the coordinates (x, y) of the extracted face are calculated ( S1040 ).

The slice data generating apparatus 700 of the 3D printer includes an image buffer (image buffer[x][y][Zmin]) corresponding to the minimum height of the slice and an image buffer (image buffer[x][ y] [Zmax]) and set all coordinate values corresponding to the rendering target (S1050).

Then, the slice data generating apparatus 700 of the 3D printer increases the current scan value by 1 (S1060), and returns to step S1020.

Meanwhile, when it is determined that the slice data generating apparatus 700 of the 3D printer does not include the coordinates (x, y), the slice data generating apparatus 700 increases the current scan value by 1 ( S1060 ) and returns to step S1020 .

The above-described method may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of implementation by hardware, the method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). , FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers and microprocessors, and the like.

In the case of implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above. The software code may be stored in the memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may transmit and receive data to and from the processor by various known means.

The embodiments disclosed herein have been described above with reference to the accompanying drawings. As such, the embodiments shown in each drawing should not be construed as being limited, and may be combined with each other by those skilled in the art having read the contents of the present specification, and when combined, it may be construed that some components may be omitted.

Here, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical ideas disclosed in the present specification.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the embodiments disclosed in the present specification, and do not represent all the technical ideas disclosed in the present specification, so various equivalents that can replace them at the time of the present application It should be understood that there may be water and variations.

310: memory 320: loading unit
330: conversion unit 332: face buffer
340: slice range designation unit 350: face overlap inspection unit
360: pixel position extractor 362: image buffer
370: image color setting unit 710: memory
720: loading unit 730: conversion unit
732: face buffer 740: slice range designator
750: image buffer generator 752: image buffer
760: parallel slicing operation unit

Claims (13)

a memory for storing 3D modeling data; and
It is connected to the memory and converts the 3D modeling data stored in the memory into face buffer data, scans the face based on the face buffer data to search for the lowest height of the slice and the highest height of the slice, and then according to the face scan result A control unit that specifies a slice range, corrects face overlap for the specified slice range, and executes a slicing operation based on the corrected face;
As a result of examining the face overlap, the control unit merges several models into one if there are several models,
The control unit extracts face buffer data included between the height of the previous slice and the height of the current slice from the face buffer, and calculates the position value of the triangle data constituting the image data of each slice, the height of the previous slice, and the height of the current slice. Extracting the position of the pixel to be changed from the image buffer in which the position value of each pixel constituting the image data is compared with each other, setting the image color at the position of the extracted pixel, and then storing the image buffer as an image file,
When the face direction is upward, the control unit sets the excluded area, and when the face direction faces any other direction, sets it as the inclusive area. set the image color,
The control unit maintains the allocation of the image buffer until the slicing is finished.
delete delete delete delete converting, by the apparatus for generating slice data of a 3D printer, 3D modeling data into face buffer data;
scanning, by the apparatus for generating slice data of the 3D printer, a face based on the face buffer data to search for a lowest height of a slice and a highest height of a slice;
specifying, by the apparatus for generating slice data of the 3D printer, a slice range according to a face scan result;
modifying, by the apparatus for generating slice data of the 3D printer, face overlap for a specified slice range; and
Including, by the device for generating slice data of the 3D printer, a slicing operation based on the corrected pace;
In the step of correcting the face overlap,
The slice data generating apparatus of the 3D printer combines several models into one when there are several models,
The slice data generating apparatus of the 3D printer calculates which direction the face faces in space according to the order of the points stored in the face buffer data,
The slice data generating apparatus of the 3D printer cuts off boundary faces overlapping each other and removes faces corresponding to the inside of each other, thereby calculating face data that correctly expresses the outline,
The step of executing the slicing operation includes:
determining, by the apparatus for generating slice data of the 3D printer, whether a current slice value is equal to the total number of slices;
extracting, by the apparatus for generating slice data of the 3D printer, a face included between a height of a previous slice and a height of a current slice from a face buffer when it is determined that the current slice value is different from the total number of slices; and
Including, by the apparatus for generating slice data of the 3D printer, performing a partial rendering operation on the extracted face;
determining, by the apparatus for generating slice data of the 3D printer, whether the current slice value is equal to the total number of slices until the current slice value is equal to the total number of slices; or executing the partial rendering operation do it repeatedly,
The step of executing the partial rendering operation comprises:
The slice data generating device of the 3D printer compares the position value of the triangle data constituting the image data of each slice, the height of the previous slice, and the height of the current slice, respectively, and the position value of each pixel constituting the image data is stored. extracting the position of the pixel to be changed from the image buffer;
setting, by the apparatus for generating slice data of the 3D printer, an exclusion region when the direction of the face faces upward, and as an inclusion region when the direction of the face faces other directions;
setting, by the apparatus for generating slice data of the 3D printer, an image color at the position of the extracted pixel in consideration of the inclusion and exclusion regions of the triangle data; and
Including, by the apparatus for generating slice data of the 3D printer, the image buffer as an image file;
In the step of setting the image color to the position of the extracted pixel,
The slice data generating method of the 3D printer, characterized in that the slice data generating apparatus of the 3D printer sets the image color only at the positions of the pixels that are allowed to be changed. delete delete delete delete delete delete delete

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