CN117774328A - Three-dimensional model compensation method and device for three-dimensional printing and storage medium - Google Patents

Abstract

The invention discloses a three-dimensional model compensation method and device for three-dimensional printing and a storage medium. Wherein the method comprises the following steps: acquiring a three-dimensional surface grid generated based on a target model; determining a target surface voxel and spatial angle information of the target surface voxel based on the three-dimensional surface grid; determining an axial distance compensation value for generating distance adjustment for the target surface voxels by the forming platform based on the space angle information; when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and a slice printing process is performed on the correction model. The invention solves the technical problem that the three-dimensional printing efficiency is not ideal because the compensation is realized by carrying out secondary slicing on the three-dimensional model in the related technology.

Description

Three-dimensional model compensation method and device for three-dimensional printing and storage medium

Technical Field

The invention relates to the technical field of three-dimensional printing, in particular to a three-dimensional model compensation method and device for three-dimensional printing and a storage medium.

Background

The photo-curing three-dimensional printing technology is realized based on the principle of layer-by-layer forming of a two-dimensional cut-layer pixel diagram of three-dimensional data. However, because the light intensity data that can be stored in the sliced pixels is limited (generally 256 levels, that is, the pixel value is between 0 and 255), or the light intensity deviates from the actual data intensity, the thickness of each layer formed may be greater than the actual thickness, and the actual phenomenon is that, for example, a pair of male and female parts are too closely attached after being printed respectively, and cannot be embedded normally. In the related art, after slicing, the slices of the front and rear layers are processed (such as intersection, boolean operation and the like), and then new slices are generated to realize three-dimensional printing, so that the printing practicability is not ideal, and the production efficiency is reduced.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a three-dimensional model compensation method, a device and a storage medium for three-dimensional printing, which at least solve the technical problem that the three-dimensional printing efficiency is not ideal because the compensation is realized by carrying out secondary slicing on a three-dimensional model in the related technology.

According to an aspect of an embodiment of the present invention, there is provided a three-dimensional model compensation method for three-dimensional printing, including: acquiring a three-dimensional surface grid generated based on a target model; determining a target surface voxel and spatial angle information of the target surface voxel based on the three-dimensional surface grid; determining an axial distance compensation value for generating distance adjustment for the target surface voxels by the forming platform based on the space angle information; when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and a slice printing process is performed on the correction model.

Optionally, determining the target surface voxel, and the spatial angle information of the target surface voxel, based on the three-dimensional surface grid, comprises: determining a target surface voxel based on the three-dimensional surface grid and rays, wherein the rays are axially parallel to a light source of the light source device, an origin of the rays is in the same plane as a light emitting plane of the light source device, and the light source device is used for emitting curing light; determining a target grid to which a target surface body belongs and a normal line of the target grid in the three-dimensional surface grid, wherein the target grid belongs to the three-dimensional surface grid; determining a target included angle between the ray and the normal; based on the target angle, spatial angle information is determined.

Optionally, determining, based on the spatial angle information, an axial distance compensation value for generating a distance adjustment for the target surface voxel by the modeling platform includes: acquiring a preset angle interval and determining a preset compensation value corresponding to the preset angle interval; and under the condition that the target included angle is matched with the preset angle interval, determining the preset compensation value as an axial distance compensation value.

Optionally, determining, based on the spatial angle information, an axial distance compensation value for generating a distance adjustment for the target surface voxel by the modeling platform includes: determining a surface voxel type of the target surface voxel based on the target included angle; determining an axial distance compensation value for generating distance adjustment for the target surface voxel by the forming platform under the condition that the surface voxel type is indicated as a first surface voxel type; the method further comprises the steps of: in case the surface voxel type is indicated as the second surface voxel type, it is determined that the profiled platform does not perform a distance adjustment of the target surface voxel in the light source axis direction.

Optionally, generating a correction model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels includes: determining a first surface voxel and a second surface voxel in a plurality of target surface voxels, wherein the first surface voxel and the second surface voxel are respectively determined based on two intersection points obtained by the same ray passing through the three-dimensional surface grid, one of the first surface voxel and the second surface voxel is of a second surface voxel type, and the other of the first surface voxel type; in the case that the first surface voxel is of a first surface voxel type and the second surface voxel is of a second surface voxel type, the distance adjustment of the first surface voxel is determined in such a way that: adjusting the distance of the first surface voxel towards the direction of the second surface voxel, wherein the adjusting distance is an axial distance compensation value corresponding to the first surface voxel; and adopting a mode of performing distance adjustment on the first surface voxels and the second surface voxels, and performing distance adjustment on the plurality of target surface voxels based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels to generate a correction model of the target model.

Optionally, determining an axial distance compensation value for distance adjustment of the three-dimensional printing nozzle to the target surface voxel in the light source axial direction based on the spatial angle information includes: determining the inclination angle of the plane where the target model and the forming platform are located and the number of printing layers required by the target model to execute three-dimensional printing processing; based on the inclination angle, the number of print layers, and the spatial angle information, an axial distance compensation value is determined.

Optionally, determining an axial distance compensation value for distance adjustment of the three-dimensional printing nozzle to the target surface voxel in the light source axial direction based on the spatial angle information includes: determining a target photosensitive material for performing printing of the target model, light transmittance of the target photosensitive material, a curing depth, and a tensile strength; an axial distance compensation value is determined based on the light transmittance, the curing depth, the tensile strength, and the spatial angle information.

According to another aspect of the embodiment of the present invention, there is provided a three-dimensional model compensation apparatus for three-dimensional printing, including: the grid acquisition module is used for acquiring a three-dimensional surface grid generated based on the target model; a voxel determining module for determining a target surface voxel based on the three-dimensional surface grid and spatial angle information of the target surface voxel; the compensation determining module is used for determining an axial distance compensation value for generating distance adjustment on the object surface voxels by the forming platform based on the space angle information; and the printing correction module is used for generating a correction model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels and executing slice printing processing on the correction model.

According to another aspect of the embodiments of the present invention, there is provided a nonvolatile storage medium storing a plurality of instructions adapted to be loaded and executed by a processor any one of the three-dimensional model compensation methods for three-dimensional printing.

According to another aspect of an embodiment of the present invention, there is provided an electronic apparatus including: the system comprises one or more processors and a memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement any one of the three-dimensional model compensation methods for three-dimensional printing.

In the embodiment of the invention, a three-dimensional surface grid generated based on a target model is obtained; determining a target surface voxel and spatial angle information of the target surface voxel based on the three-dimensional surface grid; determining an axial distance compensation value for generating distance adjustment for the target surface voxels by the forming platform based on the space angle information; when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and a slice printing process is performed on the correction model. The method achieves the purpose of completing three-dimensional printing without layering processing slicing and secondary slicing processing, achieves the technical effect of improving three-dimensional printing efficiency, and further solves the technical problem that the three-dimensional printing efficiency is not ideal due to the fact that secondary slicing is needed to be carried out on a three-dimensional model to realize compensation in the related technology.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a flow chart of an alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of an alternative 3D printing device provided in accordance with an embodiment of the present invention;

FIG. 3 is a voxel schematic diagram of an alternative three-dimensional model compensation method for three-dimensional printing provided according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of geometric features of an alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic illustration of geometric features of another alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

FIG. 6 is a schematic application diagram of an alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic application diagram of another alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

FIG. 8 is a flow chart of an alternative three-dimensional model compensation method for three-dimensional printing provided in accordance with an embodiment of the present invention;

fig. 9 is a schematic diagram of an alternative three-dimensional model compensation device for three-dimensional printing according to an embodiment of the present invention.

Wherein, the above reference numerals include the following reference numerals:

21-a forming platform; 22-a tray; 23-light source mechanism.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For convenience of description, the following will describe some terms or terms related to the embodiments of the present application:

three-dimensional surface grid refers to a grid formed by storing surface patches of a three-dimensional object and connecting all the patches.

Voxel, which refers to coordinates at a specific resolution, typically exists as an integer, which can also be understood as a shaped rectangle in space.

Surface voxels refer to voxels that are rasterized with points where rays intersect the three-dimensional surface grid, because the three-dimensional surface grid of the sampled object only holds the surface information of the three-dimensional object, when the voxels are sampled.

Arccos, the inverse of the trigonometric function cos.

In accordance with an embodiment of the present invention, there is provided a method embodiment for three-dimensional model compensation for three-dimensional printing, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.

Fig. 1 is a flowchart of a three-dimensional model compensation method for three-dimensional printing according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:

Step S102, acquiring a three-dimensional surface grid generated based on a target model;

it will be appreciated that a three-dimensional surface mesh of the object model is obtained for obtaining surface information of the object model.

Alternatively, the target model may be a model in the fields of dentistry, orthopedics, earphone, and the like. The three-dimensional printing method for the target model is photo-curing three-dimensional printing, which is a three-dimensional printing device for stacking printed objects layer by using photo-curing materials (such as photosensitive resin). Laser or other light source is used to irradiate the liquid resin to cure it into solid in specific area, and the printing process is to cure the resin layer by layer and form three-dimensional structure of the object by gradual stacking. It can be understood that the light source device penetrates through the tray containing the photosensitive resin from bottom to top, so that the resin is solidified on the forming platform, and the forming platform slowly moves upwards to realize layer-by-layer three-dimensional printing.

When 3D printing is performed, a 3D model of a printed piece can be established first, then the 3D model of the printed piece is sliced layer by layer, when printing, the first slice model can be started, each slice model is printed in sequence on the basis of the previous slice model which is successfully printed, and finally a complete 3D model of the printed piece is obtained, wherein the printed piece is a printed object in 3D printing. Fig. 2 is a schematic diagram of an optional 3D printing apparatus according to an embodiment of the present invention, as shown in fig. 2, where, when each layer of slice model is printed, a projection image may be generated according to a shape of the layer of slice model, and the projection image may be sent to a light source mechanism 23, such as an optical machine, where the light source mechanism is the light source apparatus; the light source means 23 may project a projected image onto a print area, i.e. onto a print surface, within the tray 22 filled with a polymerizable liquid, such as a photosensitive material, which will solidify under the irradiation of light from the light source means 23 to form a solid or semi-solid polymer between the shaping table 21 and the build surface, whereupon the movement of the shaping table 21 may be controlled to separate the solid or semi-solid polymer layer by layer from the build surface, eventually forming a pattern matching the projected image.

The size of the 3D printer that can support the print object at maximum is the print format, and can be identified by the specification of the pixels of the light source mechanism 23. The structured surface is the surface where light contacts the polymerizable liquid, and the polymerizable liquid may be a resin or any other polymerizable material. As shown in fig. 2, when the light-curing 3D printing is performed by adopting the downward projection method, light irradiates the resin on the bottom layer of the tray through the bottom of the tray, and a curing layer is formed between the molding platform and the bottom of the tray, and at this time, the construction surface may be the upper surface of the release film disposed on the bottom of the tray. In addition, the photo-curing printing can be performed by adopting an upward projection mode, and light rays are irradiated on the resin from above, and at the moment, the structural surface is the surface of the resin contacted with the light rays. It should be noted that the method for processing the projection area of the light source mechanism provided by the invention can be applied to a 3D printing device adopting any one of the above projection modes.

The light source mechanism of the present invention may be any Display component capable of displaying exposure image information in the art, specifically may be a laser Display device capable of displaying a projection image, or may be a projection device capable of projecting a projection image, for example, may be any one or any combination of a DLP projection module, an LCD projection module, an LCOS (Liquid CrystalOn Silicon ) projection module, an OLED projection module, a Micro-Led (Micro light emitting diode ) module, a Mini-Led (Mini light emitting diode, sub-millimeter light emitting diode) module, an LCD module, an OLED module, and a SXRD (Silicon X-Tal Re-active Display) projection module, or may be a Micro-OLED module or a Mini-OLED module.

It is contemplated that to be able to simultaneously mold a larger size or number of prints, as shown in fig. 2, multiple light source mechanisms may be arranged to project a larger swath in combination to meet printing needs. At this time, in order to ensure that the printed model is complete, and no gap exists in the middle, the projection areas of the light source mechanisms can be partially overlapped, so that the light source mechanisms project light together, and the 3D model is printed on a large format.

Step S104, determining a target surface voxel and space angle information of the target surface voxel based on the three-dimensional surface grid;

it will be appreciated that processing the three-dimensional surface mesh of the entire target model may result in surface voxels for which spatial angle information may be obtained. By importing a three-dimensional surface mesh, the voxel resolution can be set.

Alternatively, by employing antialiasing rasterization, the target surface voxels may be determined from a three-dimensional surface grid. Antialiasing rasterization is a processing technique for improving image sharpness and reducing aliasing distortion in the image, and when processing a three-dimensional surface grid, antialiasing rasterization can help determine target surface voxels, i.e., pixels or volume elements on a surface, thereby improving the accuracy and precision of the surface representation.

Optionally, each surface voxel in the three-dimensional surface grid may be smoothed by antialiasing rasterization to reduce aliasing and stair-step effects, which may be achieved by a variety of algorithms. Such as bilinear differences, bicubic interpolation, or gaussian filtering, etc. These algorithms may apply a smoothing filter on each surface voxel of the three-dimensional surface grid to smooth the surface and reduce aliasing. After the smoothing process, the shape and position of each surface voxel are more accurate, so that the accuracy and the accuracy of target surface representation are improved, and the three-dimensional printing processing capability of the target model is further improved.

In an alternative embodiment, determining the target surface voxel, and the spatial angle information of the target surface voxel, based on the three-dimensional surface grid, comprises: determining a target surface voxel based on the three-dimensional surface grid and rays, wherein the rays are axially parallel to a light source of the light source device, an origin of the rays is in the same plane as a light emitting plane of the light source device, and the light source device is used for emitting curing light; determining a target grid to which a target surface body belongs and a normal line of the target grid in the three-dimensional surface grid, wherein the target grid belongs to the three-dimensional surface grid; determining a target included angle between the ray and the normal; based on the target angle, spatial angle information is determined.

It will be understood that the ray is axially parallel to the light source of the light source device, and the ray may be regarded as a ray emitted from the light source device, the origin of the ray is in the same plane as the light emitting plane of the light source device, the light emitting plane is used for the plane of the light source device emitting the curing ray, and the direction of the ray is also consistent with the direction of the light emitted by the light source. By the interaction of the rays with the three-dimensional surface grid, the target surface voxels, i.e. the surface voxels that intersect the rays, can be precisely located. After the target surface voxel is determined, its target grid in the three-dimensional surface grid may be further determined to help describe the spatial location and properties of the target surface voxel. Each of the three-dimensional surface meshes may generate a normal representing the orientation of the mesh surface. For calculating the target angle between the ray and the normal of the target mesh, the direction and angle in space of the voxels of the target surface are provided as spatial angle information for assisting in determining the distance compensation of the three-dimensional printing.

Optionally, the light source axis of the light source device is a Z axis of the spatial coordinate system, the light emitting plane of the light source device is a plane formed by XY axes, and by moving a ray parallel to the positive direction of the Z axis on the XY plane, the origin of the ray is in the XY plane, which can be expressed as (X, Y, 0), X represents the coordinate on the X axis, and Y represents the coordinate on the Y axis. Determining an intersection point Z of the ray taking each (x, y, 0) as an origin and the three-dimensional surface grid, obtaining coordinates of surface voxels of the (x, y, Z), wherein Z is expressed as coordinates on a Z axis, and recording a normal line of a patch of the three-dimensional surface grid intersected by the current ray. The distance of the molding stage is adjusted in the Z-axis (i.e., the axis parallel to the rays).

Step S106, determining an axial distance compensation value for generating distance adjustment for the target surface voxels by a forming platform based on the space angle information, wherein the forming platform is used for bearing the photosensitive material solidified by the light source equipment;

it will be appreciated that the modeling stage will gradually move up to carry the photosensitive material cured by the light source device, and based on the spatial angle information, an axial distance compensation value is determined that produces a distance adjustment to the target surface voxel.

In an alternative embodiment, determining an axial distance compensation value for generating a distance adjustment for a target surface voxel by a modeling platform based on spatial angle information includes: acquiring a preset angle interval and determining a preset compensation value corresponding to the preset angle interval; and under the condition that the target included angle is matched with the preset angle interval, determining the preset compensation value as an axial distance compensation value.

It will be appreciated that the spatial angle information is a target angle, and a predetermined angle interval may be obtained, where the predetermined angle interval corresponds to a predetermined compensation value. In case the target angle matches the predetermined angle interval, the predetermined compensation value may be determined as an axial distance compensation value. Through the processing, the axial distance compensation value for generating distance adjustment on the target surface voxels of the forming platform can be determined according to the target included angle of the target surface voxels.

Alternatively, the predetermined angle interval may be plural, such as (0, 10), [15, 20] and the like, and the Z-axis distance to be compensated for in the interval may be set according to specific requirements.

In an alternative embodiment, determining an axial distance compensation value for generating a distance adjustment for a target surface voxel by a modeling platform based on spatial angle information includes: determining a surface voxel type of the target surface voxel based on the target included angle; determining an axial distance compensation value for generating distance adjustment for the target surface voxel by the forming platform under the condition that the surface voxel type is indicated as a first surface voxel type; the method further comprises the steps of: in case the surface voxel type is indicated as the second surface voxel type, it is determined that the profiled platform does not perform a distance adjustment of the target surface voxel in the light source axis direction.

It will be appreciated that the type of target surface voxel is determined based on the calculated target included angle, and that different included angles may correspond to different surface voxel types, each type having its particular attribute or characteristic. In case the surface voxel type is indicated as the first surface voxel type, it may be determined that a distance compensation of the target surface voxel is required and a specifically adapted axial distance compensation value is determined. And in the case that the surface voxel type is indicated as the second surface voxel type, it is determined that no distance adjustment of the target surface voxel by the modeling platform is required.

Alternatively, using each surface voxel, it can be determined that the normal, i.e., normal Z-axis component, of the target grid in the three-dimensional surface grid is denoted as a, and is taken into the formula Arccos (-a), and the target angle with the Z-axis (i.e., axially of the light source, parallel to the ray direction) is denoted as b. If b is a negative number, the surface voxel is an upper surface voxel (i.e. second surface voxel type) and b is a positive number, which is a lower surface voxel (i.e. first surface voxel type), the general Z-axis compensation adjusts only the lower surface voxel.

And (3) searching the target included angle in a preset angle interval, and judging that the angle b is smaller than the interval maximum value and larger than the interval minimum value in the preset angle interval, so as to obtain the Z-axis distance to be compensated in the interval.

In an alternative embodiment, generating a modified model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels comprises: determining a first surface voxel and a second surface voxel in a plurality of target surface voxels, wherein the first surface voxel and the second surface voxel are respectively determined based on two intersection points obtained by the same ray passing through the three-dimensional surface grid, one of the first surface voxel and the second surface voxel is of a second surface voxel type, and the other of the first surface voxel type; in the case that the first surface voxel is of a first surface voxel type and the second surface voxel is of a second surface voxel type, the distance adjustment of the first surface voxel is determined in such a way that: adjusting the distance of the first surface voxel towards the direction of the second surface voxel, wherein the adjusting distance is an axial distance compensation value corresponding to the first surface voxel; and adopting a mode of performing distance adjustment on the first surface voxels and the second surface voxels, and performing distance adjustment on the plurality of target surface voxels based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels to generate a correction model of the target model.

It will be appreciated that for a plurality of target surface voxels in the entire three-dimensional surface grid, a first surface voxel and a second surface voxel may be determined as intersections of the rays with the three-dimensional surface grid, both of which may be considered to occur in pairs, one of which must be of the first surface voxel type and the other of which is of the second surface voxel type. Since only the first surface voxel type is needed to perform the distance adjustment, in case the first surface voxel is of the first surface voxel type and the second surface voxel is of the second surface voxel type, the adjustment is performed by moving the first surface voxel in the direction of the second surface voxel, the distance moved being the axial distance compensation value corresponding to the first surface voxel. The above distance adjustment ensures printing accuracy, especially when complex or special-shaped models are processed. And (3) using the axial distance compensation values respectively corresponding to the plurality of target surface voxels to carry out distance adjustment on the plurality of target surface voxels, so that a correction model of the target model can be generated without carrying out piece-by-piece compensation correction after the slicing.

Alternatively, the first surface voxels appearing in pairs are denoted as vs and the second surface voxels are denoted as ve, and may be paired into voxel lattices in a direction perpendicular to the shaping platform, resulting in voxel columns formed by pairwise paired voxel lattices vs, ve. FIG. 3 is a schematic voxel diagram of an alternative three-dimensional model compensation method for three-dimensional printing, as shown in FIG. 3, in which a target model to be printed is represented by a circle, the direction of an arrow indicates the injection of a curing light, and a surface voxel is represented by a small rectangle, the curing light has two intersecting points with the circle, two intersecting points respectively correspond to one surface voxel, the upper surface voxel of one surface voxel of the two surface voxels, namely, the second surface voxel, is denoted as ve, the first surface voxel of the lower surface voxel of the other surface voxel is denoted as vs, and the ve and vs are paired two by two, so as to generate a new voxel column. Vs is distance-adjusted in the ve direction, and the dashed line represents the adjusted axial distance compensation value.

The distance adjustment is performed on the plurality of target surface voxels using the axial distance compensation values corresponding to the plurality of target surface voxels, respectively. Meaning that each surface voxel is individually adjusted according to its specific included angle or type to meet the precision requirement of three-dimensional printing, ensuring that each part printed achieves the best effect.

In an alternative embodiment, determining an axial distance compensation value for distance adjustment of the three-dimensional printing nozzle to the target surface voxel in the light source axis based on the spatial angle information, comprises: determining the inclination angle of the plane where the target model and the forming platform are located and the number of printing layers required by the target model to execute three-dimensional printing processing; based on the inclination angle, the number of print layers, and the spatial angle information, an axial distance compensation value is determined.

It will be appreciated that the smaller the area of the light source device that is impinged upon the photosensitive material by the energy in the curing light, the greater the projected energy density, the faster the curing, the greater the probability of easily producing a deviation in the cured thickness, and the greater the compensation value required. Similarly, if the target model is tilted, the larger the area of the curing light impinging on the photosensitive material, the smaller the projected energy density, the slower the curing, and the smaller the compensation value required. Therefore, the axial distance compensation value needs to be adjusted according to the inclination angle of the plane of the target model and the forming platform. The more layers that need to be printed for the same voxel in the target model, similarly, means that the more layers that are cured by continuous exposure in the axial direction of the light source, the more errors are accumulated, and thus the larger the compensation value. From the above, the combination of the inclination angle, the number of printing layers, and the spatial angle information based on the target model is beneficial to determining the axial distance compensation value with high accuracy.

Alternatively, the tilt angle of the object model may be expressed in terms of the normal to the surface voxel, i.e. the tilt angle is based on the angle of the normal to the surface voxel with respect to the light source axis. Fig. 4 is a schematic diagram of geometric characteristics of an alternative three-dimensional model compensation method for three-dimensional printing according to an embodiment of the present invention, as shown in fig. 4, X1 to X5 are schematic geometric diagrams of models with different inclination angles, a black thick line is an axial direction of a light source, it is easy to understand that a normal direction of X1 is perpendicular to the axial direction of the light source, and an angle with the largest angle in X1 to X5 is decreasing from X1 to X5, so that a magnitude relation of an axial distance compensation value may also be expressed as X1 < X2 < X3 < X4 < X5, and an axial distance compensation value of X1 may be set to 0, that is, not compensated.

Fig. 5 is a schematic diagram of geometric characteristics of another alternative three-dimensional model compensation method for three-dimensional printing according to an embodiment of the present invention, as shown in fig. 5, X6 to X10 are schematic diagrams of model geometric diagrams of the required number of printing layers, and a black thick line is an axial diagram of a light source, and it is easy to understand that from X6 to X10, the number of printing layers gradually increases, so that the magnitude relation of the axial distance compensation value may also be expressed as X6 < X7 < X8 < X9 < X10.

In an alternative embodiment, determining an axial distance compensation value for distance adjustment of the three-dimensional printing nozzle to the target surface voxel in the light source axis based on the spatial angle information, comprises: determining a target photosensitive material for performing printing of the target model, light transmittance of the target photosensitive material, a curing depth, and a tensile strength; an axial distance compensation value is determined based on the light transmittance, the curing depth, the tensile strength, and the spatial angle information.

It will be appreciated that determining the target photosensitive material for performing the printing target model, with respect to the properties of the material itself, the optical transmittance (i.e., light transmittance) and the depth of cure of the material, the optical transmittance of the same thickness of different materials, and the depth of cure of different materials, the depth of cure referring to the thickness value resulting from curing the material at the same exposure time, will result in different materials having different axial distance compensation values under the same geometric characteristics. The geometric light transmittance, the curing depth, the tensile strength and the spatial angle information can enable the accuracy of the axial distance compensation value to be higher.

Alternatively, the higher the optical transmittance under the same condition, the larger the axial distance compensation value, the higher the curing depth, and the transmittance, and on the other hand, the mechanical properties (tensile strength) of the material are also affected, and different materials can have different axial distance compensation values under the same geometric characteristics, and the lower the material strength is, the larger the axial distance compensation value is. Because the intrinsic properties of the material are complex effects of recombination, the actual measurement values are mainly taken as main, table 1 shows the performance schematic of the photosensitive materials, and HP2.0, PAT10 and PAH10 respectively represent three different photosensitive materials. The curing depth is exemplified by curing within 2 seconds, MPa is expressed in units of megapascals and mm is expressed in units of millimeters. The axial distance compensation values shown in table 1 are the maximum compensation values when the normal and horizontal angles of the target model are 0 degrees, and specific values in the table are only shown.

TABLE 1

Material	Transmittance of light	Depth of cure	Mechanical properties	Axial distance compensation value
					HP2.0	12％	0.16mm	42MPa	0.15mm
PAT10	82％	0.24mm	38MPa	0.45mm
					PAH10	70％	0.18mm	106MPa	0.24mm

In step S108, when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and the slice printing process is performed on the correction model.

It will be appreciated that the three-dimensional surface grid may have a plurality of target surface voxels, the axial distance compensation values of which are determined separately, and that a modified model of the target model may be generated without slicing. And the slice printing process is carried out on the correction model, only one slice is needed, and compared with the related two-slice mode, the three-dimensional printing efficiency can be better.

Through the step S102, a three-dimensional surface mesh generated based on the target model is obtained; step S104, determining a target surface voxel and space angle information of the target surface voxel based on the three-dimensional surface grid; step S106, determining an axial distance compensation value for generating distance adjustment for the target surface voxels by a forming platform based on the space angle information, wherein the forming platform is used for bearing the photosensitive material solidified by the light source equipment; in step S108, when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and the slice printing process is performed on the correction model. The method can realize the purpose of completing three-dimensional printing processing without layering processing slicing and secondary slicing processing, achieves the technical effect of improving the three-dimensional printing efficiency, and further solves the technical problem that the three-dimensional printing efficiency is not ideal due to the fact that secondary slicing is needed to be carried out on a three-dimensional model to realize compensation in the related technology.

Based on the above embodiment and the optional embodiment, the present invention proposes an optional embodiment, which is applied to three-dimensional printing of dental models, and can compensate for tooth modeling and three-dimensional printing compensation for tooth planting due to differences in tooth inclination angles of different models. The implant holes and the tooth model may be used as target models.

Fig. 6 is an application schematic diagram of an alternative three-dimensional model compensation method for three-dimensional printing according to an embodiment of the present invention, as shown in fig. 6, 3 dental models corresponding to fig. 6 are respectively identified as A1, A2, and A3, and the angles of inclination of the anterior teeth of the models A1, A2, and A3 are different, and three angles of inclination B1, B2, and B3 are respectively corresponding to each other. It can be understood that the compensation of the models A1, A2 and A3 in the axial direction of the light source is not the same, and the model accuracy requirement is met under the condition of tooth inclination in different models.

Fig. 7 is a schematic diagram of an application of another three-dimensional model compensation method for three-dimensional printing, which is provided according to an embodiment of the present invention, and is shown in fig. 7, in which a dental implant model is shown, C1 represents a top view of the implant model, C2 represents a side perspective view of the implant model, the implant model includes a plurality of implant holes, two holes D1 and D2 are labeled in an example, and it can be seen from the side perspective view of C2 that the inclination angles of D1 and D2 are different, which coincides with a natural growth angle of teeth, especially, a component with a high precision requirement, such as an implant hole needs to perform three-dimensional printing compensation processing on different inclination angles of the implant holes.

Fig. 8 is a schematic flow chart of an alternative three-dimensional model compensation method for three-dimensional printing, which is provided by the embodiment of the invention, wherein the three-dimensional surface grid of the target model is subjected to antialiasing rasterization, and a surface voxel grid of the three-dimensional surface grid, which is perpendicular to the direction of a forming platform, is obtained by adopting a mode that the three-dimensional surface grid is axially intersected with a light source of curing light, so that the voxel grid, gray scale and the normal direction of the target grid can be bound.

By pairing the upper surface voxels and the lower surface voxels in a direction perpendicular to the molding platform, a voxel column can be obtained. The light source axial direction is perpendicular to the forming platform and the light emitting platform of the light source equipment, the target grid of each lower surface voxel is calculated respectively, and the target angle is obtained from the normal direction of the target grid to the rotation angle perpendicular to the forming platform direction (namely, the light source axial direction).

And (3) carrying out table lookup in a preset angle interval by adopting the target angle to obtain the preset compensation distance (namely the preset compensation value) under the angle. Each lower surface voxel is reduced by a corresponding compensation distance towards the upper surface voxel direction, so that a new lower surface voxel is obtained. By adopting the mode, a correction model can be generated based on the target model, the processed voxels are converted into two-dimensional images of each layer, namely, slices, and the two-dimensional images can be led into a printer for exposure to finish the three-dimensional printing processing of the target model.

At least the following effects are achieved by the above alternative embodiments: the model printed in the photo-curing three-dimensional mode is subjected to single slicing treatment, two slicing treatments in the related technology are not needed, and correction treatment on the slices is not needed, so that better printing practicability is achieved, the time for processing after manual work is shortened, and the production efficiency is improved.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

In this embodiment, a three-dimensional model compensation device for three-dimensional printing is further provided, and the device is used for implementing the foregoing embodiments and preferred embodiments, and is not described again. As used below, the terms "module," "apparatus" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

According to an embodiment of the present invention, there is further provided an apparatus embodiment for implementing a three-dimensional model compensation method for three-dimensional printing, and fig. 9 is a schematic diagram of a three-dimensional model compensation apparatus for three-dimensional printing according to an embodiment of the present invention, as shown in fig. 9, and the three-dimensional model compensation apparatus for three-dimensional printing includes: the apparatus is described below as a mesh acquisition module 902, a voxel determination module 904, a compensation determination module 906, and a print correction module 908.

A grid acquisition module 902, configured to acquire a three-dimensional surface grid generated based on the target model;

a voxel determining module 904, coupled to the grid acquisition module 902, for determining a target surface voxel based on the three-dimensional surface grid, and spatial angle information of the target surface voxel;

a compensation determination module 906, coupled to the voxel determination module 904, for determining an axial distance compensation value for generating a distance adjustment for the target surface voxel by the modeling platform based on the spatial angle information;

the print correction module 908 is connected to the compensation determination module 906, and is configured to generate a correction model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels, and perform a slice print process on the correction model, in the case where the plurality of target surface voxels are present.

In the three-dimensional model compensation device for three-dimensional printing provided by the embodiment of the invention, a three-dimensional surface grid generated based on a target model is acquired through a grid acquisition module 902; a voxel determining module 904, coupled to the grid acquisition module 902, for determining a target surface voxel based on the three-dimensional surface grid, and spatial angle information of the target surface voxel; a compensation determination module 906, coupled to the voxel determination module 904, for determining an axial distance compensation value for generating a distance adjustment for the target surface voxel by the modeling platform based on the spatial angle information; the print correction module 908 is connected to the compensation determination module 906, and is configured to generate a correction model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels, and perform a slice print process on the correction model, in the case where the plurality of target surface voxels are present. The method achieves the purpose of completing three-dimensional printing without layering processing slicing and secondary slicing processing, achieves the technical effect of improving three-dimensional printing efficiency, and further solves the technical problem that the three-dimensional printing efficiency is not ideal due to the fact that secondary slicing is needed to be carried out on a three-dimensional model to realize compensation in the related technology.

It should be noted that each of the above modules may be implemented by software or hardware, for example, in the latter case, it may be implemented by: the above modules may be located in the same processor; alternatively, the various modules described above may be located in different processors in any combination.

Here, the mesh acquisition module 902, the voxel determination module 904, the compensation determination module 906, and the print correction module 908 correspond to steps S102 to S108 in the embodiment, and the modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in the embodiment. It should be noted that the above modules may be run in a computer terminal as part of the apparatus.

It should be noted that, the optional or preferred implementation manner of this embodiment may be referred to the related description in the embodiment, and will not be repeated herein.

The three-dimensional model compensation device for three-dimensional printing may further include a processor and a memory, the grid acquisition module 902, the voxel determination module 904, the compensation determination module 906, the print correction module 908, and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel may be provided with one or more. The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

Embodiments of the present invention provide a nonvolatile storage medium having a program stored thereon, which when executed by a processor, implements a three-dimensional model compensation method for three-dimensional printing.

The embodiment of the invention provides an electronic device, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the following steps are realized when the processor executes the program: acquiring a three-dimensional surface grid generated based on a target model; determining a target surface voxel and spatial angle information of the target surface voxel based on the three-dimensional surface grid; determining an axial distance compensation value for generating distance adjustment for the target surface voxels by the forming platform based on the space angle information; when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and a slice printing process is performed on the correction model. The device herein may be a server, a PC, etc.

The invention also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with the method steps of: acquiring a three-dimensional surface grid generated based on a target model; determining a target surface voxel and spatial angle information of the target surface voxel based on the three-dimensional surface grid; determining an axial distance compensation value for generating distance adjustment for the target surface voxels by the forming platform based on the space angle information; when there are a plurality of target surface voxels, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plurality of target surface voxels, and a slice printing process is performed on the correction model.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.

Claims (10)

1. A three-dimensional model compensation method for three-dimensional printing, comprising:

acquiring a three-dimensional surface grid generated based on a target model;

determining a target surface voxel, and spatial angle information of the target surface voxel, based on the three-dimensional surface grid;

determining an axial distance compensation value for generating distance adjustment for the target surface voxels by a forming platform based on the spatial angle information;

when the target surface voxels are plural, a correction model of the target model is generated based on the axial distance compensation values corresponding to the plural target surface voxels, and a slice printing process is performed on the correction model.

2. The method of claim 1, wherein determining a target surface voxel based on the three-dimensional surface grid, and spatial angle information of the target surface voxel, comprises:

determining the target surface voxel based on the three-dimensional surface grid and rays, wherein the rays are axially parallel to a light source of a light source device, an origin of the rays is in the same plane as a light emitting plane of the light source device, and the light source device is used for emitting solidified light;

Determining a target grid to which the target surface body belongs and a normal line of the target grid in the three-dimensional surface grid, wherein the target grid belongs to the three-dimensional surface grid;

determining a target angle between the ray and the normal;

and determining the space angle information based on the target included angle.

3. The method of claim 2, wherein determining an axial distance compensation value for a distance adjustment of the target surface voxel by a shaping platform based on the spatial angle information comprises:

acquiring a preset angle interval and determining a preset compensation value corresponding to the preset angle interval;

and under the condition that the target included angle is matched with the preset angle interval, determining the preset compensation value as the axial distance compensation value.

4. The method of claim 2, wherein determining an axial distance compensation value for a distance adjustment of the target surface voxel by a shaping platform based on the spatial angle information comprises:

determining a surface voxel type of the target surface voxel based on the target included angle;

determining the axial distance compensation value for which the shaping platform generates a distance adjustment for the target surface voxel, in case the surface voxel type is indicated as a first surface voxel type;

The method further comprises the steps of: in the case that the surface voxel type is indicated as a second surface voxel type, it is determined that the shaping platform does not perform a distance adjustment of the target surface voxel in the light source axis direction.

5. The method of claim 4, wherein generating a modified model of the target model based on the axial distance compensation values for each of the plurality of target surface voxels comprises:

determining a first surface voxel and a second surface voxel in the plurality of target surface voxels, wherein the first surface voxel and the second surface voxel are respectively determined based on two intersection points obtained by the same ray passing through the three-dimensional surface grid, one of the first surface voxel and the second surface voxel is of the second surface voxel type, and the other of the first surface voxel type;

when the first surface voxel is of the first surface voxel type and the second surface voxel is of the second surface voxel type, determining that the distance adjustment is performed on the first surface voxel is as follows: adjusting the distance of the first surface voxel to the direction of the second surface voxel, wherein the adjusting distance is an axial distance compensation value corresponding to the first surface voxel;

And adopting a mode of performing distance adjustment on the first surface voxels and the second surface voxels, and performing distance adjustment on the plurality of target surface voxels based on axial distance compensation values corresponding to the plurality of target surface voxels respectively to generate a correction model of the target model.

6. The method according to any one of claims 1 to 5, wherein determining an axial distance compensation value for distance adjustment of the target surface voxel by the three-dimensional printing nozzle in the light source axial direction based on the spatial angle information comprises:

determining the inclination angle of the plane where the target model and the forming platform are located and the number of printing layers required by the target model to execute three-dimensional printing processing;

and determining the axial distance compensation value based on the inclination angle, the number of printing layers and the spatial angle information.

7. The method according to any one of claims 1 to 5, wherein determining an axial distance compensation value for distance adjustment of the target surface voxel by the three-dimensional printing nozzle in the light source axial direction based on the spatial angle information comprises:

determining a target photosensitive material performing printing of the target model, a light transmittance of the target photosensitive material, a curing depth, and a tensile strength;

The axial distance compensation value is determined based on the light transmittance, the cure depth, the tensile strength, and the spatial angle information.

8. A three-dimensional modeling apparatus for three-dimensional printing, comprising:

the grid acquisition module is used for acquiring a three-dimensional surface grid generated based on the target model;

a voxel determining module for determining a target surface voxel based on the three-dimensional surface grid, and spatial angle information of the target surface voxel;

the compensation determining module is used for determining an axial distance compensation value for generating distance adjustment on the target surface voxels by the forming platform based on the space angle information;

and the printing correction module is used for generating a correction model of the target model based on the axial distance compensation values respectively corresponding to the plurality of target surface voxels and executing slice printing processing on the correction model.

9. A non-volatile storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the three-dimensional model compensation method for three-dimensional printing of any one of claims 1 to 7.

10. An electronic device, comprising: one or more processors and memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the three-dimensional model compensation method for three-dimensional printing of any of claims 1-7.