CN114147969B - Model preprocessing annular texture blanking method, device, equipment and storage medium - Google Patents
Model preprocessing annular texture blanking method, device, equipment and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 79
- 238000007781 pre-processing Methods 0.000 title claims abstract description 56
- 238000007639 printing Methods 0.000 claims abstract description 54
- 238000010146 3D printing Methods 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims description 24
- 229920005989 resin Polymers 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 20
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
The invention provides a model preprocessing annular texture blanking method, device and equipment and a storage medium, and relates to the technical field of 3D printing. The specific implementation scheme is as follows: in a computer model preprocessing link, continuously subdividing triangular grids of the 3D model until two types of triangular grids with fineness less than a preset value are generated; selecting reference points for each two-class triangular mesh plane, enabling the reference points to displace by L+DeltaX millimeters along the normal vector direction of the mesh, and generating a plurality of three-class triangular meshes by the reference points and each endpoint of the mesh to form a 3D model with three-class triangular mesh protrusions or depressions; after the 3D model is sliced, a slicing mask image with irregular saw-tooth-shaped image edges is obtained, and after the 3D model is printed, stacked and reconstructed layer by layer, partial blanking of the annular texture on the surface of the 3D model manufactured by exposure printing is finally realized.
Description
Technical Field
The application relates to the technical field of 3D printing, in particular to a model preprocessing annular texture blanking method, a device, equipment and a storage medium.
Background
In the current photocuring 3D printing, because the photocuring printing manufacture of the 3D model is formed by photocuring stacking of resin layers formed by exposing a plurality of layers of slice images, when the cube model is printed, the side surface of the model is smooth and has no annular texture; however, when printing a model with multiple curved surfaces, the side and Z-axis directions of the model inevitably have annular textures similar to contour lines, which are very noticeable especially in low resolution printing machines or under reflective conditions. This is because in the prior art, the resolution of the mask slice image obtained after the 3D model is sliced according to the uniform layer thickness needs to be consistent with the resolution of the developing mask screen, so that the 3D model mask slice image under the continuous unit pixels is affected by the resolution of the developing mask screen, the arc-shaped edge of the 3D model mask slice image inevitably has a clearer regular saw-tooth-shaped structure, and when the multi-layer arc-shaped edge regular saw-tooth-shaped resin molding layers are stacked to form a step layer similar to an arc-shaped surface, the regular saw-tooth-shaped structure between different layers of the exposure molding model can form annular textures on the side surface of the model. However, the formation of the annular texture in the Z-axis direction of the mold is achieved because the current photo-curing 3D printing technology is based on stacking of multiple resin molding layers in the Z-axis direction, and thus the formation of the annular stacked texture is unavoidable when the upper arc surface is printed on the stack.
When the surface of the model needs to be printed with a pattern with a smaller pattern, the existence of the annular texture can interfere the sight of people, and particularly under the condition of light reflection, the pattern with the detailed characteristic can not be highlighted. It is therefore desirable to propose a suitable method to achieve blanking of the model part loop texture.
Disclosure of Invention
Aiming at the problem of realizing the side annular texture of the model in the background technology, in order to realize the blanking of the side annular texture of the model, the invention provides a model preprocessing annular texture blanking method, which is characterized in that triangular grids of a 3D model are continuously subdivided in a computer model preprocessing link until two types of triangular grids with fineness smaller than a preset value are generated; selecting reference points for each two-class triangular mesh plane, enabling the reference points to displace by L+DeltaX millimeters along the normal vector direction of the mesh, and generating a plurality of three-class triangular meshes by the reference points and each endpoint of the mesh to form a 3D model with three-class triangular mesh protrusions or depressions; after the 3D model is sliced, a slicing mask image with irregular saw-tooth-shaped image edges is obtained, and after the 3D model is printed, stacked and reconstructed layer by layer, partial blanking of the annular texture on the surface of the 3D model manufactured by exposure printing is finally realized.
The technical method adopted by the application of the invention is as follows:
according to a first aspect of the present invention, there is provided a model preprocessing ring texture blanking method, in a computer model preprocessing step, a computer control unit continuously subdivides a triangular mesh of a 3D model, and adds protrusion or depression features to the triangular mesh generated after subdivision, so as to implement partial blanking of a part of ring texture on a surface of the 3D model manufactured by final exposure printing, the method comprising:
the computer runs a 3D printing model preprocessing program to load a 3D model;
the control unit traverses and splices all X groups of triangular grids forming the 3D model;
the control unit subdivides all the X groups of triangular grids by using a three-dimensional grid subdivision algorithm to generate two types of triangular grids with fineness less than a preset value;
the control unit selects M reference points from each class II triangular mesh plane;
the control unit enables the reference point to displace L+DeltaX mm along the normal vector direction of the grid, and then a plurality of three types of triangular grids are generated by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
the control unit layers the 3D model slice with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters and acquires all N layers of slice mask images;
The control unit stores all N layers of slice mask image data in the computer storage unit;
the 3D printing apparatus imports the slice mask image data and the printing parameters and performs exposure printing manufacturing.
Further, the model preprocessing annular texture blanking method further comprises the step that the control unit performs antialiasing processing on all N layers of slice mask images layer by layer.
Preferably, in the model preprocessing ring texture blanking method, the control unit subdivides all the X groups of triangular grids to generate two types of triangular grids with fineness smaller than a preset value, and the method comprises the following steps:
the SS02 and the control unit traverse and splice all X groups of triangular grids forming the 3D model;
the SS04 and the control unit acquire all edge length data included in a K group of triangular grids in all X groups of triangular grids;
the SS06 and the control unit judge whether the side lengths of the obtained group of triangular grids are smaller than a preset value Z mm or not; if the obtained side lengths of the group of triangular grids are smaller than the preset value Z mm, performing step SS14; if the obtained side lengths of the group of triangular grids are not smaller than the preset value Z mm, performing step SS08;
SS08, the control unit takes the midpoint of one longest edge in the group and obtains the midpoint coordinate;
The SS10 and the control unit are connected with the diagonal end points of the triangular grids at the middle points of the longest sides so as to divide one triangular grid into two triangular grids;
the SS12 and the control unit judge whether the side lengths of all triangular grids included in the group are smaller than a preset value Z mm or not; if all the triangular mesh side lengths included in the group are not smaller than the preset value Z mm, performing step SS08; if all the triangular mesh side lengths included in the group are judged to be smaller than the preset value Z mm, step SS14 is carried out;
the SS14 and the control unit judge whether all the X groups of triangular grids are processed and subdivided; if all the processing subdivision is judged to be completed for all the X groups of triangular grids, step SS18 is carried out; if it is judged that all the processing subdivision is not completed for all the X groups of triangular grids, step SS16 is performed;
SS16, the control unit obtains the length data of all the side lines included in the K+1th group of triangular grids in all the X groups of triangular grids, and the next step is SS06;
the SS18 and the control unit subdivide all the X groups of triangular grids into two types of triangular grid data with side lengths smaller than Z millimeters, and temporarily store the two types of triangular grid data in the storage unit;
and SS20, ending the flow.
Preferably, a three-dimensional grid subdivision algorithm apparatus adopted in the step S106 includes:
The triangular grid acquisition module is used for traversing and splicing all X groups of triangular grids forming the 3D model;
the triangular grid side length acquisition module is used for acquiring all side line length data included in a K-th group of triangular grids in all X groups of triangular grids;
the first comparison module of the triangular side length is used for judging whether each side length of the obtained group of triangular grids is smaller than a preset value Z mm;
the longest side midpoint acquiring module is used for acquiring a midpoint of one longest side in the group and acquiring midpoint coordinates;
the triangular grid bipartition module is used for connecting the diagonal end points of the triangular grid where the midpoint of the longest edge is positioned so as to bipartite one triangular grid into two triangular grids;
the triangular side length second comparison module is used for judging whether the side length of all triangular grids included in the group is smaller than a preset value Z mm or not;
the triangular mesh subdivision completion judging module is used for judging whether all the X groups of triangular meshes are processed and subdivided completely;
the second-class triangular mesh data temporary storage module is used for subdividing all the X groups of triangular meshes into second-class triangular mesh data with the side length smaller than Z millimeters, and temporarily storing the second-class triangular mesh data in the storage unit;
and the ending module is used for ending the flow.
Preferably, the reference point is the centroid, or the orthocenter, or the inner center, or the outer center of the triangle.
Preferably, X, M, N is a positive integer and L, Z is a positive integer or decimal; the DeltaX is an error value less than L; the K is a positive integer which increases from 1.
According to a second aspect of the present application, there is provided a model-preprocessing annular texture blanking apparatus, comprising:
the model loading module is used for loading the 3D model;
the triangular grid acquisition module is used for traversing and splicing all X groups of triangular grids forming the 3D model;
the second-class triangular grid generation module is used for subdividing all the X groups of triangular grids by utilizing a three-dimensional grid subdivision algorithm to generate second-class triangular grids with fineness less than a preset value;
the reference point selection module is used for selecting M reference points in each class II triangular mesh plane;
three types of triangular grid generating modules are used for enabling the reference point to displace L+DeltaX millimeters along the normal vector direction of the grid, and generating a plurality of three types of triangular grids by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
the model slicing module is used for layering the 3D model slices with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters and acquiring all N layers of slice mask images;
The storage module is used for storing all N layers of slice mask image data in the computer storage unit;
and the importing and exposing printing module is used for importing the slicing mask image data and the printing parameters and carrying out exposing printing.
Further, the model preprocessing annular texture blanking device further comprises:
and the antialiasing picture processing module is used for performing antialiasing processing on all N-layer slice mask images layer by layer.
According to a third aspect of the present application, there is provided a non-transitory computer readable storage medium storing a computer program which, when executed by a control unit, implements the steps of a model pre-processing annular texture blanking method.
According to a fourth aspect of the present application, there is provided a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the steps of a model pre-processing annular texture blanking method.
According to a fifth aspect of the present application, there is provided an electronic device comprising: at least one control unit; and a memory unit in communication with the at least one control unit; wherein the storage unit stores instructions executable by the at least one control unit to enable the at least one control unit to perform the steps of a model pre-processing annular texture blanking method.
According to a sixth aspect of the present application, there is provided a 3D printing apparatus for performing the steps of a model pre-processing annular texture blanking method, comprising: the device comprises a controller, a developing mask screen, a motor, a memory, a UVLED light source module, a display and operation unit, a forming platform, a liquid tank, a lifting column, a bottom film, photosensitive resin and a base; the controller, the developing mask screen, the UVLED light source module and the liquid tank are connected to the base; the motor is connected with the forming platform; the lifting column is fixedly connected to the base; the motor is arranged on the lifting column to realize electric driving lifting and drive the forming platform to lift or descend along with the lifting column; the bottom film is arranged at the bottom of the liquid tank and used for transmitting light; cheng Fangguang sensitive resin liquid in the liquid tank; the controller is electrically connected with the developing mask screen, the motor, the memory, the UVLED light source module and the display and operation unit; the memory stores imported slice mask image data and printing parameters; the controller reads slice mask image data and printing parameters in the memory; the controller sets the printing parameters as control parameters during printing; the controller loads the slice mask image data into a developing mask screen for mask exposure; the controller controls the motor to drive the forming platform to perform lifting movement according to printing parameters; the user sends an operation instruction to the controller through the display and operation unit, so that the controller responds to the instruction and sends a control signal to control each controlled unit to complete the instruction action, and man-machine interaction operation is realized; the controller outputs signals and data to the display and operation unit so as to display a 3D model slice mask preview image, machine control parameters, system setting options and system operation parameters; the controller controls the motor to drive the forming platform to perform lifting movement according to printing parameters; the controller controls the UVLED light source module to light up or turn off; the UVLED light source module emits ultraviolet light and visible light to expose and irradiate the photosensitive resin in the liquid tank through a mask image and a bottom film in the developing mask screen so as to solidify and form the photosensitive resin; the molding platform is used for attaching the molded resin layer of the mold after curing molding in the curing molding process to enable the molded resin layer to continuously lift and grow until the 3D printing is completed; the 3D printing equipment adopts a rising type LCD photo-curing 3D printer or a sinking type LCD photo-curing 3D printer.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method provided by the application, triangular grids of the 3D model are directly and continuously subdivided in a computer model preprocessing link until two types of triangular grids with fineness smaller than a preset value are generated; selecting reference points for each two-class triangular mesh plane, enabling the reference points to displace by L+DeltaX millimeters along the normal vector direction of the mesh, and generating a plurality of three-class triangular meshes by the reference points and each endpoint of the mesh to form a 3D model with three-class triangular mesh protrusions or depressions; after the 3D model is sliced, a slicing mask image with irregular saw-tooth-shaped image edges is obtained, and after the 3D model is printed, stacked and reconstructed layer by layer, the partial blanking of the annular texture on the surface of the 3D model manufactured by exposure printing is finally realized, and particularly, the partial blanking of the annular texture on the side part of the 3D model can be realized.
2. According to the method provided by the application, the characteristic processing of the model surface is directly finished in the computer model preprocessing link by means of the quick calculation force of the computer, and the partial blanking of the annular texture on the model surface can be realized finally without other special processing in the follow-up normal slicing link and the printing link, so that the special division and the efficient execution of the model preprocessing and the printing link are facilitated.
3. According to the method provided by the application, after the characteristic treatment of the model surface is directly finished in the computer model pretreatment link by means of the rapid calculation force of the computer, the antialiasing treatment can be further carried out on the slice image in the normal slice link, and the surface finish of the exposure molding model is improved due to the combination of the antialiasing treatment function, and meanwhile, the annular textures on the side part of the model can be blanked.
4. The invention correspondingly provides a specific three-dimensional grid subdivision algorithm, and the triangular grids are continuously subdivided by utilizing a bipartite mode, so that each large triangular grid can be finally subdivided into the smallest triangular grid meeting the fineness requirement, and the projections or the depressions are produced on the basis, so that the original 3D model can generate fine projections or depression features under the condition that the original large structural features are kept unchanged, the surface finish of the exposure molding model can be finally controlled, and the annular textures on the side part of the model can be blanked.
Drawings
FIG. 1 is a flow chart of an embodiment 1 of a model pre-processing annular texture blanking method of the present invention;
FIG. 2 is a flow chart of embodiment 2 of the model pre-processing annular texture blanking method of the present invention;
FIG. 3 is a flow chart of an embodiment of a three-dimensional grid subdivision algorithm in accordance with the present invention;
FIG. 4 is a schematic perspective view of a 3D model triangular mesh assembly according to the present invention;
FIGS. 5A-E are schematic views of the subdivision of the triangular mesh of the 3D model and the generation of protrusions or depressions in accordance with the present invention;
FIG. 6A is a schematic block diagram of an embodiment 1 of a model pre-processing ring texture blanking apparatus of the present invention;
FIG. 6B is a schematic block diagram of an embodiment 2 of a model pre-processing ring texture blanking apparatus of the present invention;
FIG. 7 is a schematic diagram of an embodiment of a three-dimensional mesh subdivision algorithm apparatus in accordance with the present invention;
FIGS. 8A-B are schematic diagrams of model pretreatment slices of the present invention;
FIGS. 9A-B illustrate the edge implementation effect contrast of mask images before and after blanking of the model pre-processed annular texture of the present invention;
FIGS. 10A-B are graphs of 3D model surface implementation effects before and after blanking of the model pre-processed annular texture of the present invention;
FIG. 11 is a block diagram illustrating an embodiment of an electronic device implementing the model pre-processing ring texture blanking method of the present invention;
FIG. 12 is a schematic diagram of preprocessing a 3D model slice for an embodiment of the electronic device of the present invention;
FIG. 13 is a block diagram of a 3D printing device implementing the method model pre-processing ring texture blanking method of the present invention;
FIG. 14 is a schematic diagram of a 3D printing apparatus implementing the method model pre-processing annular texture blanking method of the present invention;
FIG. 15 is a schematic view of a 3D printing apparatus for importing slicing mask image data and printing parameters according to embodiment 1 of the present invention;
fig. 16 is a schematic diagram of a process for 3D printing fabrication using the method of the present invention.
Description of the reference numerals:
3D model 1; a triangular mesh 2; an electronic device 12; a 3D printing device 13; a mobile storage device 14; a computer program 120; a control unit 121; a storage unit 122;
a print control program 130; a controller 131; a memory 132; a display and operation unit 133; a UVLED light source module 134; developing the mask screen 135; a liquid tank 136; a forming platform 137; a motor 138; a base 139; a base film 1361; a photosensitive resin 1362; a mold resin layer 1371; a shaping mold 1372; lifting columns 1381;
model loading module 702; a triangular mesh acquisition module 704; a class II triangular mesh generation module 706; a reference point selection module 708; three types of triangular mesh generation modules 710; a model slicing module 712; an antialiasing picture processing module 713; a storage module 714; an import and exposure print module 716; entity model 718;
triangle mesh side length acquisition module 802; triangle side length first comparison module 804; a longest edge midpoint acquisition module 808; triangle mesh bipartite module 810; triangle side length second comparison module 812; a triangular mesh subdivision completion determination module 814; a class II triangular mesh data temporary storage module 818; and an end module 820.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of an embodiment 1 of the method for blanking a model-preconditioned annular texture. In the method shown in embodiment 1, in the preprocessing link of the computer model, the triangular mesh of the 3D model is continuously subdivided by the computer control unit, and the triangular mesh generated after subdivision is added with protruding or recessed features, so that partial blanking of the annular texture on the surface of the 3D model manufactured by final exposure printing is realized. As shown in the figure, a model preprocessing annular texture blanking method embodiment 1 includes the following steps:
s102, a computer runs a 3D printing model preprocessing program to load a 3D model;
s104, traversing and splicing all X groups of triangular grids forming the 3D model by the control unit;
s106, the control unit subdivides all the X groups of triangular grids by using a three-dimensional grid subdivision algorithm to generate two types of triangular grids with fineness less than a preset value;
s108, the control unit selects M reference points from each class II triangular mesh plane;
s110, the control unit enables the reference point to displace L+DeltaX millimeters along the normal vector direction of the grid, and then a plurality of three types of triangular grids are generated by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
S112, layering the 3D model slice with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters by the control unit, and acquiring all N layers of slice mask images;
s114, the control unit stores all N layers of slice mask image data in the computer storage unit;
s116, the 3D printing equipment imports the slicing mask image data and the printing parameters and performs exposure printing manufacturing.
FIG. 2 is a flow chart of embodiment 2 of the method for blanking a model-preconditioning annular texture. The method of example 2 is augmented with a step S113 as compared to fig. 1. As shown in the figure, a model preprocessing annular texture blanking method embodiment 2 includes the following steps:
s102, a computer runs a 3D printing model preprocessing program to load a 3D model;
s104, traversing and splicing all X groups of triangular grids forming the 3D model by the control unit;
s106, the control unit subdivides all the X groups of triangular grids by using a three-dimensional grid subdivision algorithm to generate two types of triangular grids with fineness less than a preset value;
s108, the control unit selects M reference points from each class II triangular mesh plane;
s110, the control unit enables the reference point to displace L+DeltaX millimeters along the normal vector direction of the grid, and then a plurality of three types of triangular grids are generated by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
S112, layering the 3D model slice with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters by the control unit, and acquiring all N layers of slice mask images;
s113, the control unit performs antialiasing treatment on all N layers of slice mask images layer by layer;
s114, the control unit stores all N layers of slice mask image data in the computer storage unit;
s116, the 3D printing equipment imports the slicing mask image data and the printing parameters and performs exposure printing manufacturing.
FIG. 3 is a flow chart of an embodiment of a three-dimensional grid subdivision algorithm in accordance with the present invention. The three-dimensional grid Subdivision algorithm provided by the embodiment is different from a Loop Subdivision algorithm (Loop Subdivision) or a butterfly Subdivision algorithm (Butterfly Subdivision), and adopts a triangular grid Loop Subdivision mode until the side length of all triangular grids is smaller than the preset length. As shown, a three-dimensional mesh subdivision algorithm includes the steps of:
the SS02 and the control unit traverse and splice all X groups of triangular grids forming the 3D model;
the SS04 and the control unit acquire all edge length data included in a K group of triangular grids in all X groups of triangular grids;
the SS06 and the control unit judge whether the side lengths of the obtained group of triangular grids are smaller than a preset value Z mm or not; if the obtained side lengths of the group of triangular grids are smaller than the preset value Z mm, performing step SS14; if the obtained side lengths of the group of triangular grids are not smaller than the preset value Z mm, performing step SS08;
SS08, the control unit takes the midpoint of one longest edge in the group and obtains the midpoint coordinate;
the SS10 and the control unit are connected with the diagonal end points of the triangular grids at the middle points of the longest sides so as to divide one triangular grid into two triangular grids;
the SS12 and the control unit judge whether the side lengths of all triangular grids included in the group are smaller than a preset value Z mm or not; if all the triangular mesh side lengths included in the group are not smaller than the preset value Z mm, performing step SS08; if all the triangular mesh side lengths included in the group are judged to be smaller than the preset value Z mm, step SS14 is carried out;
the SS14 and the control unit judge whether all the X groups of triangular grids are processed and subdivided; if all the processing subdivision is judged to be completed for all the X groups of triangular grids, step SS18 is carried out; if it is judged that all the processing subdivision is not completed for all the X groups of triangular grids, step SS16 is performed;
SS16, the control unit obtains the length data of all the side lines included in the K+1th group of triangular grids in all the X groups of triangular grids, and the next step is SS06;
the SS18 and the control unit subdivide all the X groups of triangular grids into two types of triangular grid data with side lengths smaller than Z millimeters, and temporarily store the two types of triangular grid data in the storage unit;
And SS20, ending the flow.
In particular, it should be explained that, before the control unit acquires all the X groups of triangular meshes and does not subdivide, each group of triangular meshes includes only one triangular mesh; after two triangular grids are divided into two at a time, the generated two or more triangular grids which are subdivided for a plurality of times are still included under the group of triangular grids; when three sides or two sides are equal in length, the control unit randomly selects one side to take the middle point and divides the middle point into two parts; according to the above steps, even if the two sides are equal in length or the three sides are equal in length, after the longest side is taken for three times to take the middle point and two halves are carried out, all triangular grids can be subdivided into two triangular grids with each side smaller than a preset value Z mm.
Fig. 4 is a schematic perspective view of the 3D model triangular mesh of the present invention. As shown in the figure, after the computer runs the 3D printing model preprocessing software and loads the 3D model; a triangular mesh model 1 of the 3D model can be obtained; the surface of the whole 3D model is approximately constituted by the triangular mesh 2.
Fig. 5A-E are schematic views of the subdivision of the triangular mesh of the 3D model and the generation of protrusions or depressions according to the present invention. Wherein fig. 5A, 5B correspond to the three-dimensional grid subdivision algorithm embodiment process of fig. 3; taking the group of triangular grids 2 taken from fig. 4 as an example in fig. 5A, the control unit obtains three-side length data of A1A2, A2A3 and A1A3 in the group of triangular grids; assuming that the three-side length data of A1A2, A2A3 and A1A3 in the group of triangular grids are all larger than a preset value Z millimeter through judgment, taking a midpoint B1 for the longest side A1A3 in the group of triangular grids; then the midpoint B1 is connected with the diagonal endpoint A2 so as to divide the group of triangular grids A1A2A3 into two parts of S1 and S2, thereby forming two new triangular grids A1A2B1 and A2A3B1 in the group; assuming that the three side lengths of the two new triangular grids A1A2B1 and A2A3B1 in the group are smaller than a preset value Z millimeter, the two new triangular grids A1A2B1 and A2A3B1 are two types of triangular grids 21; assuming that the control unit judges that the three sides of the two new triangular grids A1A2B1 and A2A3B1 respectively still have sides larger than the preset value Z millimeter, the two new triangular grids cannot be called as the two-class triangular grid 21, and are required to be subdivided;
On the basis of fig. 5A, assuming that the side lengths of the triangular grids of the two parts S1 and S2 are not less than the preset value Z mm, the middle points B2 and B3 need to be taken, and the diagonal end points B1 are respectively connected so as to divide the triangular grids of the two parts S1 and S2 into four parts S11, S12, S21 and S22, if the side lengths of the triangular grids of the four parts S11, S12, S21 and S22 are less than the preset value Z mm, the triangular grids of the four parts are two-class triangular grids 21;
fig. 5C is a view of fig. 5B, in which centroid points C1, C2, C3, and C4 are taken as reference points for the triangular meshes of the four parts S11, S12, S21, and S22, respectively;
FIG. 5D is a graph of FIG. 5C, in which centroid reference points C1, C2, C3, C4 are displaced by L1 mm or L2 mm along the direction of the normal vector of the grid to generate protrusion points P1, P2, P3, P4, and specifically, L1 may be equal to L2 or L1 may not be equal to L2 as required; if L1 is equal to L2, the protrusion heights of the respective protrusion points P1, P2, P3 and P4 on the surface of the subsequent model are basically equal; if L1 is not equal to L2, the protrusion height of each protrusion point on the surface of the subsequent model is high or low; in this embodiment, if L1 is equal to L2 and is greater than 0, then the subsequent model surface generates protruding features outwards; if L1 is equal to L2 and is smaller than 0, generating concave features inwards on the surface of the subsequent model;
Fig. 5E is a 3D model with three types of triangular mesh 211 protrusions formed by connecting centroid reference points C1, C2, C3, and C4 with the end points of each two types of triangular mesh 21 on the basis of fig. 5D.
FIG. 6A is a schematic block diagram of an embodiment 1 of a model-preconditioning annular texture blanking apparatus of the present invention. As shown in the figure, corresponding to the method embodiment of fig. 1, the present application accordingly provides a model preprocessing annular texture blanking apparatus, including:
a model loading module 702 for loading a 3D model;
the triangular mesh acquisition module 704 is used for traversing and splicing all X groups of triangular meshes forming the 3D model;
the second-class triangular mesh generation module 706 is configured to subdivide all the X groups of triangular meshes by using a three-dimensional mesh subdivision algorithm to generate a second-class triangular mesh with fineness less than a preset value;
a reference point selection module 708, configured to select M reference points in each class two triangular mesh plane;
three types of triangular grid generating modules 710, configured to displace the reference point by l+Δx millimeters along the normal vector direction of the grid, and generate a plurality of three types of triangular grids from the reference point and each endpoint of the grid, so as to form a 3D model with three types of triangular grid protrusions or recesses;
a model slicing module 712, configured to layer the 3D model slice with three types of triangular mesh protrusions or depressions according to a preset layer thickness of H millimeters and obtain all N-layer slice mask images;
A storage module 714 for storing all N-layer slice mask image data in a computer storage unit;
an import and exposure printing module 716 for importing the slice mask image data and the printing parameters and performing exposure printing;
in addition, a solid model 718 is also included, and a solid model with the ring texture being partially blanked is obtained after exposure printing.
FIG. 6B is a schematic block diagram of an embodiment 2 of a model pre-processing ring texture blanking apparatus of the present invention. As shown in the figure, corresponding to the embodiment of fig. 1, an antialiasing image processing module 713 is added on the basis of fig. 6A to perform antialiasing processing on all N-layer slice mask images layer by layer in the model preprocessing ring texture blanking device provided by the present invention.
Fig. 7 is a schematic diagram of an embodiment of a three-dimensional grid subdivision algorithm apparatus according to the present invention. As shown in the figure, corresponding to the method embodiment of fig. 3, the present application accordingly provides a three-dimensional grid subdivision algorithm apparatus, including:
the triangular mesh acquisition module 704 is used for traversing and splicing all X groups of triangular meshes forming the 3D model;
a triangle mesh side length obtaining module 802, configured to obtain all side length data included in a kth group of triangle meshes in all the X groups of triangle meshes;
A triangle side length first comparison module 806, configured to determine whether each side length of the acquired set of triangle meshes is smaller than a preset value Z mm;
a longest edge midpoint acquiring module 808, configured to acquire a midpoint for one longest edge in the set and acquire a midpoint coordinate;
triangle mesh bipartition module 810 for connecting the diagonal end points of the triangle mesh where the midpoint of the longest edge is located so as to bipartite one triangle mesh into two triangle meshes;
a triangle side length second comparing module 812, configured to determine whether all triangle mesh side lengths included in the group are smaller than a preset value Z mm;
the triangle mesh subdivision completion judging module 814 is configured to judge whether all the X groups of triangle meshes are processed for subdivision completion;
the second-class triangular mesh data temporary storage module 818 is configured to subdivide all the X groups of triangular meshes into second-class triangular mesh data with a side length smaller than Z millimeters, and temporarily store the second-class triangular mesh data in the storage unit;
an end module 820 is used to end the process.
Fig. 8A-B are schematic diagrams of pre-treatment slices of the model of the present invention. As shown in fig. 8A, taking a spherical 3D model as an example, after a computer runs a 3D printing model preprocessing program to load the 3D model, according to the embodiment of the method of fig. 1 of the present application, protruding or recessed features are added to the spherical 3D model, then slicing the 3D model into 7 layers according to a preset layer thickness H millimeter, and obtaining all L01-L07 slice mask images on an XY cross-section plane as shown in fig. 8B, wherein the center of each layer of mask image is white, the periphery is black, and after loading a developing mask, the white part is used for exposing the image through uv led uv light, and the black part is used for blocking the penetration of the uv led uv light; in particular, since the spherical 3D model is subjected to the processing of steps S102 to S110 in the embodiment 1 of the method of the present invention in the preprocessing step of the computer model, the white contour edge of each slice mask image of the L01-L07 layer has irregular saw teeth, which is to partially blank the annular texture of the surface of the spherical solid model finally printed and molded.
Fig. 9A-B are graphs of the edge effects of mask images before and after the model pre-processing ring texture blanking of the present invention. As shown in the figure, the left picture in FIG. 9A is a one-page slicing mask image obtained after the 3D printing model preprocessing program is run by a computer and the spherical 3D model is loaded for slicing, wherein the gray value of the white part is 255 and the gray value of the black part is 0; amplifying a section of image of the white edge to obtain a right image, wherein the white edge of the image is visible to have clear saw teeth which are not subjected to anti-saw tooth treatment; the left picture in fig. 9B is a slice mask image of a page processed by the method of embodiment 1 of the present invention, and a section of the image with the white edge is enlarged to obtain a right image, and the white edge of the image is seen to have irregular saw teeth as shown in fig. 8B.
FIGS. 10A-B are graphs of the 3D model surface implementation effects before and after blanking of the model-pretreated annular texture of the present invention. As shown in the figure, the left picture in FIG. 10A is a model preview picture obtained by re-stacking and reconstructing all layers of slice mask images according to a set layer thickness after loading a spherical 3D model to obtain all slice mask images without using the 3D printing model preprocessing program in the embodiment 1 of the method of the present invention, and the preview picture basically shows the surface characteristics of the model after 3D printing and manufacturing, and corresponds to the description in the background art. In the figure, a block of image taken by a broken line box is enlarged to obtain a right image, and the image is seen to form annular textures similar to contour lines in the Z-axis direction, because the current photocuring 3D printing technology is realized based on stacking of multiple resin molding layers in the Z-axis direction, and therefore, the annular stacking textures are inevitably formed when the upper arc-shaped surface is printed in a stacking manner. The formation of the annular texture at the position of the dotted circle of the 3D spherical side surface is the annular texture naturally formed when the arc-shaped surface is formed by approximately stacking the regular saw-tooth-shaped structural layers of different layers. The aim of the embodiment 1 of the method is to process the surface of a spherical 3D model into a convex or concave characteristic in a pretreatment link of a computer model; the slicing again yields the slice image with irregular saw tooth mask shown in fig. 9B, such that the circular texture of this kind of 3D spherical side dashed circle location is blanked.
In fig. 10B, the left picture is that in the case of embodiment 1 of the method of the present invention, after the spherical 3D model is loaded by the computer running the 3D printing model preprocessing program, the surface of the spherical 3D model is processed to have the protrusion or depression characteristics in the computer model preprocessing link; after all slice mask images are obtained through slicing treatment, after the multi-layer irregular saw tooth mask slice images shown in fig. 9B are obtained, the slice mask images processed by all layers are re-stacked and reconstructed into an integral model preview according to the set layer thickness, the preview basically shows the surface characteristics of the model after 3D printing manufacture, and meanwhile, the actual effect of partial blanking of the annular texture of the surface of the model is realized after a certain surface finish of the model is lost; it can be seen that the method of the present invention is temporarily unable to blank out the ring texture that is hidden from view in the Z-axis direction. The image taken by the broken line box in the figure is enlarged to obtain a right image, the image is formed by stacking irregular structural layers, and irregular edge notches as shown in fig. 9B can be seen in detail.
FIG. 11 is a block diagram illustrating an embodiment of an electronic device implementing the model pre-processing ring texture blanking method of the present invention. The electronic device 12 is illustrated as an example of a control unit 121. As shown, an electronic device 12 includes a control unit 121 and a storage unit 122; the storage unit 122 stores therein a computer program 120 or instructions executable by the control unit 121, the computer program 120 or instructions being executed by the control unit 121 to enable the control unit 121 to implement steps S112-S114 of a model preprocessing loop texture blanking method as described in method embodiment 1 of the present invention.
The storage unit 122 is a third aspect of the present invention, and a non-transitory computer readable storage medium is provided. The storage unit 122 stores instructions executable by the at least one control unit 121, so that the at least one control unit 121 can implement steps S112-S114 of a model preprocessing annular texture blanking method according to the embodiment 1 of the present invention. The non-transitory computer readable storage medium of the present invention stores computer instructions for enabling a computer to implement steps S112-S114 of a model preprocessing loop texture blanking method as described in method embodiment 1 of the present invention.
The storage unit 122 is used as a non-transitory computer readable storage medium, and is used to store a non-transitory software program, a non-transitory computer executable program, and modules, such as program instructions/modules corresponding to steps S112-S114 of a model-preprocessing annular texture blanking method according to embodiment 1 of the present invention. The control unit 121 executes various functional applications of the server and data processing by executing the non-transitory computer program 120, instructions, and modules stored in the storage unit 122, i.e., implements steps S112-S114 in the above-described embodiment corresponding to fig. 1.
The storage unit 122 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created when the electronic device 12 uses the method, and the like. In addition, the memory unit 122 may include a high-speed random access memory unit, and may further include a non-transitory memory unit, such as at least one magnetic disk storage unit, a flash memory device, or other non-transitory solid-state storage unit. In some embodiments, the storage unit 122 may optionally include a storage unit remotely located with respect to the control unit 121, which may be connected to the support structure-generated electronics via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Various implementations of the systems and techniques described here can be realized in digital electronic circuitry, integrated circuitry, application specific ASIC (application specific integrated circuit), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable control unit, which may be a dedicated or general purpose programmable control unit, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input unit, and at least one output device.
These computing programs 120 (also referred to as programs, software applications, or code) include machine instructions for a programmable control unit, and may be implemented in a high-level procedural and/or object-oriented programming language, and/or in assembly/machine language. As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus, and/or device (e.g., magnetic discs, optical disks, storage units, programmable Logic Devices (PLDs)) used to provide machine instructions and/or data to a programmable control unit, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal used to provide machine instructions and/or data to a programmable control unit.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, provided that the desired results of the disclosed embodiments are achieved, and are not limited herein.
FIG. 12 is a schematic diagram of preprocessing a 3D model slice for an embodiment of the electronic device of the present invention. As shown, a user loads a 3D model by running 3D slicing software through the electronic device 12, completes slicing after surface treating the spherical 3D model to have protruding or recessed features and obtains a plurality of slice mask images to slice cross-sectional positions; on the basis, in combination with step S116 of method embodiment 1 of the present application, after loading, exposing, printing and forming a plurality of slice mask images by the 3D printing device 15, a forming model for realizing blanking of a part of annular texture is obtained;
FIG. 13 is a block diagram of a 3D printing device implementing the method model pre-processing ring texture blanking method of the present invention. As shown, a 3D printing apparatus 13 includes a controller 131 and a memory 132; the memory 132 stores a print control program 130 or instructions executable by the controller 131, and the print control program 130 or instructions are executed by the controller 131 to enable the controller 131 to execute step S116 of the model preprocessing annular texture blanking method described in method embodiment 1 of the present invention.
Fig. 14 is a schematic diagram of a 3D printing apparatus implementing the method model pre-processing ring texture blanking method of the present invention. The 3D printing apparatus is merely for illustration, description and explanation, and is not a limitation of the present invention. As shown, there is provided a 3D printing apparatus for performing a model preprocessing loop texture blanking method as described in method embodiment 1 of the present invention, which includes: a controller 131, a memory 132, a display and operation unit 133, a uv led light source module 134, a developing mask screen 135, a liquid tank 136, a molding stage 137, a motor 138, a base 139, a base film 1361, a photosensitive resin 1362, and a lift column 1381; the controller 131, the UVLED light source module 134, the developing mask screen 135 and the liquid tank 136 are connected to the base 139; the motor 138 is connected with the forming platform 137; the lifting column 1381 is fixedly connected to the base 139; the motor 138 is mounted on the lifting column 1381 to realize electric driving lifting and driving the forming platform 137 to lift or descend along with the lifting column; the bottom film 1361 is arranged at the bottom of the liquid tank 136 and is used for transmitting light; a Cheng Fangguang sensitive resin 1362 liquid in said liquid bath; the controller 131 is electrically connected with the developing mask screen 135, the motor 138, the memory 132, the UVLED light source module 134 and the display and operation unit 133; the memory 132 stores the imported slice mask image and printing parameters; the controller 131 reads the processed slice mask image and the printing parameters in the memory 132; the controller 131 sets the printing parameters as control parameters at the time of printing; the controller 131 loads the obtained 3D model slice mask image after the protrusion or depression surface feature treatment into the developing mask screen 135 for mask exposure; the controller 131 controls the motor 138 to drive the molding platform 137 to perform lifting motion according to the printing execution parameters; the user sends an operation instruction to the controller 131 through the display and operation unit 133, so that the controller 131 responds to the instruction and sends a control signal to control each controlled unit to complete the instruction action, and man-machine interaction operation is realized; the controller 131 outputs signals and data to the display and operation unit 133 so as to display the 3D model slice mask preview image, the machine control parameters, the system setting options, and the system operation parameters; the controller 131 controls the motor 138 to drive the forming platform 137 to perform lifting movement according to the printing parameter; the controller 131 controls the uv led light source module 134 to light up or off; the uv led light source module 134 emits uv light and visible light, and the uv led light source module irradiates the photosensitive resin 1362 in the liquid tank 136 through the mask image and the bottom film 1361 in the developing mask screen 135 to cure and form the photosensitive resin 1362; the molding platform 137 is used for attaching the molded mold molding resin layer 1371 after curing and molding in the curing and molding process to enable the mold molding resin layer to continuously lift and grow until the 3D printing is completed; the 3D printing apparatus 13 employs a rising LCD photo-curing 3D printer or a sinking LCD photo-curing 3D printer.
Fig. 15 is a schematic diagram of a slice mask image data and printing parameter importing 3D printing apparatus according to embodiment 1 of the present invention. As shown in the figure, the user uses the mobile storage device 14 to import the obtained 3D model slice mask image data and printing parameters processed by the protrusion or depression surface features in the electronic device 12 into the 3D printing device 13, and then the 3D printing device 13 performs exposure printing according to the obtained mask image data and printing parameters.
Fig. 16 is a schematic diagram of a process for 3D printing fabrication using the method of the present invention. As shown in the figure, the electronic device 12 uses a computer, and in combination with the method embodiment 1 of the present invention, the surface of the spherical 3D model is processed to have the protrusion or recess feature, and then slicing is completed, and slice mask image data and printing parameters are obtained; then, exposure printing is performed by the 3D printing apparatus 13, resulting in a molding model 1372 having a ring texture blanking effect.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (11)
1. A model-pretreated annular texture blanking method, comprising:
the computer runs a 3D printing model preprocessing program to load a 3D model;
the control unit traverses and splices all X groups of triangular grids forming the 3D model;
the control unit subdivides all the X groups of triangular grids by using a three-dimensional grid subdivision algorithm to generate two types of triangular grids with fineness less than a preset value;
the control unit selects M reference points from each class II triangular mesh plane;
the control unit enables the reference point to displace L+DeltaX mm along the normal vector direction of the grid, and then a plurality of three types of triangular grids are generated by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
the control unit layers the 3D model slice with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters and acquires all N layers of slice mask images;
the control unit stores all N layers of slice mask image data in the computer storage unit;
the 3D printing device imports the slicing mask image data and the printing parameters and performs exposure printing.
2. A model preprocessing annular texture blanking method according to claim 1, further comprising the control unit performing antialiasing processing on all N-layer slice mask images layer by layer.
3. The model preprocessing ring texture blanking method as claimed in claim 1, wherein the control unit subdivides all the X groups of triangular meshes to generate two types of triangular meshes with fineness less than a preset value, and the method comprises the following steps:
the SS02 and the control unit traverse and splice all X groups of triangular grids forming the 3D model;
the SS04 and the control unit acquire all edge length data included in a K group of triangular grids in all X groups of triangular grids;
the SS06 and the control unit judge whether the side lengths of the obtained group of triangular grids are smaller than a preset value Z mm or not; if the obtained side lengths of the group of triangular grids are smaller than the preset value Z mm, performing step SS14; if the obtained side lengths of the group of triangular grids are not smaller than the preset value Z mm, performing step SS08;
SS08, the control unit takes the midpoint of one longest edge in the group and obtains the midpoint coordinate;
the SS10 and the control unit are connected with the diagonal end points of the triangular grids at the middle points of the longest sides so as to divide one triangular grid into two triangular grids;
the SS12 and the control unit judge whether the side lengths of all triangular grids included in the group are smaller than a preset value Z mm or not; if all the triangular mesh side lengths included in the group are not smaller than the preset value Z mm, performing step SS08; if all the triangular mesh side lengths included in the group are judged to be smaller than the preset value Z mm, step SS14 is carried out;
The SS14 and the control unit judge whether all the X groups of triangular grids are processed and subdivided; if all the processing subdivision is judged to be completed for all the X groups of triangular grids, step SS18 is carried out; if it is judged that all the processing subdivision is not completed for all the X groups of triangular grids, step SS16 is performed;
SS16, the control unit obtains the length data of all the side lines included in the K+1th group of triangular grids in all the X groups of triangular grids, and the next step is SS06;
the SS18 and the control unit subdivide all the X groups of triangular grids into two types of triangular grid data with side lengths smaller than Z millimeters, and temporarily store the two types of triangular grid data in the storage unit;
and SS20, ending the flow.
4. A model preprocessing annular texture blanking method according to claim 1, characterized in that the reference point is the centroid, or the orthocenter, or the inner or outer center of a triangle.
5. A model-preconditioning annular texture blanking apparatus, comprising:
the model loading module is used for loading the 3D model;
the triangular grid acquisition module is used for traversing and splicing all X groups of triangular grids forming the 3D model;
the second-class triangular grid generation module is used for subdividing all the X groups of triangular grids by utilizing a three-dimensional grid subdivision algorithm to generate second-class triangular grids with fineness less than a preset value;
The reference point selection module is used for selecting M reference points in each class II triangular mesh plane;
three types of triangular grid generating modules are used for enabling the reference point to displace L+DeltaX millimeters along the normal vector direction of the grid, and generating a plurality of three types of triangular grids by the reference point and each endpoint of the grid so as to form a 3D model with three types of triangular grid protrusions or depressions;
the model slicing module is used for layering the 3D model slices with three types of triangular grid protrusions or depressions according to a preset layer thickness of H millimeters and acquiring all N layers of slice mask images;
the storage module is used for storing all N layers of slice mask image data in the computer storage unit;
and the importing and exposing printing module is used for importing the slicing mask image data and the printing parameters and carrying out exposing printing.
6. The model pre-processing annular texture blanking apparatus of claim 5, further comprising: and the antialiasing picture processing module is used for performing antialiasing processing on all N-layer slice mask images layer by layer.
7. The model preprocessing loop texture blanking apparatus as set forth in claim 5, wherein said class two triangular mesh generation module includes:
The triangular grid acquisition module is used for traversing and splicing all X groups of triangular grids forming the 3D model;
the triangular grid side length acquisition module is used for acquiring all side line length data included in a K-th group of triangular grids in all X groups of triangular grids;
the first comparison module of the triangular side length is used for judging whether each side length of the obtained group of triangular grids is smaller than a preset value Z mm;
the longest side midpoint acquiring module is used for acquiring a midpoint of one longest side in the group and acquiring midpoint coordinates;
the triangular grid bipartition module is used for connecting the diagonal end points of the triangular grid where the midpoint of the longest edge is positioned so as to bipartite one triangular grid into two triangular grids;
the triangular side length second comparison module is used for judging whether the side length of all triangular grids included in the group is smaller than a preset value Z mm or not;
the triangular mesh subdivision completion judging module is used for judging whether all the X groups of triangular meshes are processed and subdivided completely;
the second-class triangular mesh data temporary storage module is used for subdividing all the X groups of triangular meshes into second-class triangular mesh data with the side length smaller than Z millimeters, and temporarily storing the second-class triangular mesh data in the storage unit;
and the ending module is used for ending the flow.
8. A non-transitory computer readable storage medium storing a computer program which, when executed by a control unit, implements the steps of the model preprocessing loop texture blanking method as claimed in claim 1.
9. A computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the steps of the model pre-processing annular texture blanking method of claim 1.
10. An electronic device, comprising: at least one control unit; and a memory unit in communication with the at least one control unit; wherein the storage unit stores instructions executable by the at least one control unit to enable the at least one control unit to perform the steps of the model pre-processing annular texture blanking method as claimed in claim 1.
11. A 3D printing apparatus for performing the steps of the model preprocessing loop texture blanking method as claimed in claim 1, comprising: the device comprises a controller, a developing mask screen, a motor, a memory, a UVLED light source module, a display and operation unit, a forming platform, a liquid tank, a lifting column, a bottom film, photosensitive resin and a base; the controller, the developing mask screen, the UVLED light source module and the liquid tank are connected to the base; the motor is connected with the forming platform; the lifting column is fixedly connected to the base; the motor is arranged on the lifting column to realize electric driving lifting and drive the forming platform to lift or descend along with the lifting column; the bottom film is arranged at the bottom of the liquid tank and used for transmitting light; cheng Fangguang sensitive resin liquid in the liquid tank; the controller is electrically connected with the developing mask screen, the motor, the memory, the UVLED light source module and the display and operation unit; the memory stores imported slice mask image data and printing parameters; the controller reads slice mask image data and printing parameters in the memory; the controller sets the printing parameters as control parameters during printing; the controller loads the slice mask image data into a developing mask screen for mask exposure; the controller controls the motor to drive the forming platform to perform lifting movement according to printing parameters; the user sends an operation instruction to the controller through the display and operation unit, so that the controller responds to the instruction and sends a control signal to control each controlled unit to complete the instruction action, and man-machine interaction operation is realized; the controller outputs signals and data to the display and operation unit so as to display a 3D model slice mask preview image, machine control parameters, system setting options and system operation parameters; the controller controls the motor to drive the forming platform to perform lifting movement according to printing parameters; the controller controls the UVLED light source module to light up or turn off; the UVLED light source module emits ultraviolet light and visible light to expose and irradiate the photosensitive resin in the liquid tank through a mask image and a bottom film in the developing mask screen so as to solidify and form the photosensitive resin; the molding platform is used for attaching the molded resin layer of the mold after curing molding in the curing molding process to enable the molded resin layer to continuously lift and grow until the 3D printing is completed; the 3D printing equipment adopts a rising type LCD photo-curing 3D printer or a sinking type LCD photo-curing 3D printer.
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