CN111161419A - Sectioning method and device for three-dimensional model and storage medium - Google Patents
Sectioning method and device for three-dimensional model and storage medium Download PDFInfo
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- CN111161419A CN111161419A CN201911375163.7A CN201911375163A CN111161419A CN 111161419 A CN111161419 A CN 111161419A CN 201911375163 A CN201911375163 A CN 201911375163A CN 111161419 A CN111161419 A CN 111161419A
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Abstract
The application relates to a sectioning method, a sectioning device, computer equipment and a storage medium of a three-dimensional model. The method comprises the following steps: obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model; projecting to a Z axis according to each mapping coordinate point on the spline curve to obtain a curved surface central point corresponding to each mapping coordinate point; obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point; generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model; generating the sectioning curved surface according to the sectioning curved surface boundary point; and sectioning the three-dimensional model along the sectioning curve. By adopting the method, the processing difficulty of the three-dimensional model can be reduced.
Description
Technical Field
The application relates to the technical field of computers, in particular to a sectioning method and a sectioning device for a three-dimensional model and a storage medium.
Background
With the development of computer science, model simulation has gradually progressed from single visual simulation to physical simulation, and in reconstruction and visualization of a three-dimensional surface model, in order to obtain a desired model shape, any curved surface sectioning operation on the three-dimensional model is often required.
Mesh models are generally an important three-dimensional shape representation method, and triangular meshes are most widely used. Mesh models can represent arbitrarily complex surfaces and spatial shapes with arbitrary precision. For example, in the medical field, such as the design of bone orthoses and braces, the blood flow analysis of coronary artery models, and the like, human organs or bone models need to be analyzed, so that the mesh model can be cut into any curved surface, and a model with a shape required clinically can be obtained, and the method has great clinical value and practical significance.
The curved surface boundary dissected by the sectioning operation of the currently adopted triangular mesh model can generate wavy saw teeth, so that the subsequent operation on the three-dimensional model is difficult, and the resource waste is caused.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus, a computer device, and a storage medium for sectioning a three-dimensional model, which can reduce the difficulty of model processing, in view of the above-described technical problems.
In a first aspect, an embodiment of the present application provides a method for sectioning a three-dimensional model, where the method includes:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
In one embodiment, the obtaining a spline curve of the three-dimensional model includes:
acquiring a plurality of input coordinate points, wherein the input coordinate points are coordinate points input by a user through external equipment;
carrying out spline interpolation calculation on each input coordinate point in a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point;
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and connecting each mapping coordinate point in a closed mode to form the spline curve.
In one embodiment, the smoothing method includes: cubic B-spline processing, Besses curve processing, and CatmulRom curve processing.
In one embodiment, the generating the boundary points of the sectioning surface according to the intersection point of the sectioning connecting line and the three-dimensional model includes:
moving the intersection point along the sectioning connecting line to the inner side of the three-dimensional model by a preset distance to obtain the inner side boundary point corresponding to each sectioning connecting line;
moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer side boundary point corresponding to each sectioning connecting line;
wherein the inner boundary point is located inside a surface of the three-dimensional model, and the outer boundary point is located outside the surface of the three-dimensional model.
In one embodiment, the generating the sectioning surface according to the sectioning surface boundary point includes:
connecting the inner boundary points and the outer boundary points at intervals to form a plurality of triangular surfaces;
and splicing the triangular surfaces to form the sectioning curved surface.
In one embodiment, the mapping each of the interpolated coordinate points to a model surface of the three-dimensional model to obtain a plurality of mapped coordinate points includes:
converting the interpolation coordinate point into a view coordinate system to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system;
converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point;
converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point;
and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model.
In one embodiment, before the obtaining the plurality of input coordinate points, the method includes:
obtaining a model file of the three-dimensional model;
initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode;
and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points.
In one embodiment, the sectioning the three-dimensional model along the sectioning curve includes:
sectioning the three-dimensional model by adopting the sectioning curved surface to obtain at least two three-dimensional submodels;
and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying.
In a second aspect, an embodiment of the present application provides a sectioning device for a three-dimensional model, the device including:
the acquisition module is used for acquiring a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
the processing module is used for projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point, and obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
the generating module is used for generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model and generating the sectioning curved surface according to the sectioning curved surface boundary point;
and the sectioning module is used for sectioning the three-dimensional model along the sectioning curved surface.
In a third aspect, an embodiment of the present application provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the following steps when executing the computer program:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
According to the sectioning method and device for the three-dimensional model, the computer equipment obtains a spline curve which is generated based on coordinate points input by a user and is located on the surface of the three-dimensional model, and projects each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point. Then the computer device obtains a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point, then generates a plurality of sectioning curved surface boundary points distributed on the surface of the three-dimensional model according to the intersection points of the sectioning connecting line and the three-dimensional model, and finally generates a smooth sectioning curved surface according to the plurality of sectioning curved surface boundary points, thereby avoiding the problem of large subsequent operation difficulty of the three-dimensional model caused by obtaining a serrated sectioning surface by adopting a traditional sectioning mode.
Drawings
FIG. 1 is a diagram illustrating an internal structure of a computer device according to an embodiment;
FIG. 2 is a schematic flow chart of a sectioning method of a three-dimensional model according to an embodiment;
FIG. 3 is a schematic flow chart of a method for sectioning a three-dimensional model according to another embodiment;
FIG. 3a is a schematic diagram of a coordinate mapped point and a center point of a curved surface in a three-dimensional model according to yet another embodiment;
FIG. 3b is a schematic view of a cut surface produced according to yet another embodiment;
FIG. 3c is a schematic diagram of a coordinate transformation process according to another embodiment;
FIG. 3d is a schematic view of a sectioning system of a three-dimensional model provided by yet another embodiment;
fig. 4 is a schematic structural diagram of a cutting device of the three-dimensional model provided by the embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The sectioning method of the three-dimensional model provided by the embodiment of the application can be applied to the computer equipment shown in fig. 1. The computer device comprises a processor, a memory, a network interface, a database, a display screen and an input device which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the three-dimensional models in the following embodiments, and the detailed description of the three-dimensional models is provided in the following embodiments. The network interface of the computer device may be used to communicate with other devices outside over a network connection. Optionally, the computer device may be a server, a desktop, a personal digital assistant, other terminal devices such as a tablet computer, a mobile phone, and the like, or a cloud or a remote server, and the specific form of the computer device is not limited in the embodiment of the present application. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like. Of course, the input device and the display screen may not belong to a part of the computer device, and may be external devices of the computer device.
Those skilled in the art will appreciate that the architecture shown in fig. 1 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
It should be noted that the execution main body of the method embodiments described below may be a cutting device of a three-dimensional model, and the device may be implemented as part or all of the computer device described above by software, hardware or a combination of software and hardware. The following method embodiments are described by taking the execution subject as the computer device as an example.
Fig. 2 is a schematic flow chart of a sectioning method of a three-dimensional model according to an embodiment. The embodiment relates to a specific process of sectioning a three-dimensional model by a computer device according to a spline curve formed by coordinate points input by a user. As shown in fig. 2, includes:
s10, obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the surface of the three-dimensional model based on a coordinate point input by a user or a characteristic point obtained by a preset algorithm.
Specifically, the user inputs a plurality of coordinate points by observing the three-dimensional model displayed on the screen and operating the computer device, for example, clicking the three-dimensional model using a mouse. Or analyzing the three-dimensional model based on a preset algorithm to obtain characteristic points meeting certain conditions, such as obtaining segmentation points by using a segmentation algorithm. And the computer equipment calculates the received coordinate points input by the user and automatically generates a continuous spline curve which is a closed curve and is positioned on the surface of the three-dimensional model. Alternatively, the computer device may project a coordinate point input by a user onto the three-dimensional model surface, and if the coordinate point input by the user is located on the three-dimensional model surface, the coordinate point and the projection point are the same point, and then the computer device connects each projection point to form a smooth curve, thereby obtaining the spline curve.
And S20, projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point.
Specifically, the computer device projects each mapping coordinate point to the Z axis, that is, the coordinate value in the Z circumferential direction is kept unchanged, and the coordinate values in the X and Y axis directions are changed to 0, so as to obtain a curved surface center point corresponding to each mapping coordinate point, where the curved surface center points correspond to the mapping coordinate points one to one. It should be noted that the Z-axis is the central axis of the three-dimensional model. In another application, the coordinate values in the X and Y directions may be changed to other preset fixed values, such as a straight line X ═ a and Y ═ b.
In this step, the original coordinate system may be transformed first, the middle axis of the three-dimensional model is transformed into a new Z axis, and then the coordinate points on the spline curve are projected to the new Z axis to obtain the curved surface center point. If the original coordinate system is X ' Y ' Z ', the transformation coordinate system XYZ is obtained by transformation, and the middle axis of the three-dimensional model is set as the Z axis.
And S30, obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point.
Specifically, the computer device takes the connecting line of each mapping coordinate point and the corresponding curved surface center point as a sectioning connecting line, so that a plurality of sectioning connecting lines are obtained. It can be seen that the cut connecting line intersects the three-dimensional model with a plurality of intersection points.
And S40, generating a cutting curved surface boundary point according to the intersection point of the cutting connecting line and the three-dimensional model.
Specifically, the computer device may generate the sectioning surface boundary points according to intersection points of the sectioning connecting lines and the three-dimensional model, and optionally, may perform interpolation calculation on a plurality of intersection points of the sectioning connecting lines and the three-dimensional model to obtain a plurality of sectioning surface boundary points. Optionally, the size of the granularity for performing the interpolation calculation may be set according to needs, which is not limited in this embodiment.
And S50, generating the sectioning surface according to the sectioning surface boundary point.
Specifically, the computer device generates the cut curved surface according to the plurality of cut curved surface boundary points, and may be configured to smoothly connect the plurality of cut curved surface boundary points to form the cut curved surface. Alternatively, the cut surface may be a closed surface, and the cut surface boundary point is located on the boundary of the closed surface.
And S60, cutting the three-dimensional model along the cutting curve.
Specifically, the computer device dissects the three-dimensional model along the dissecting curved surface, so that the three-dimensional model is smoothly segmented, and the dissected three-dimensional model with a smooth dissecting surface is obtained. Optionally, the computer device may call a clip interface in a Computational Geometry algorithm Library (CGAL Library for short), perform clipping on the three-dimensional model according to the cutting curve, extract point and plane information in the clipped Surface Mesh, construct PolyData, and perform rendering to obtain the sub-model after cutting. Optionally, the three-dimensional model may be a human body trunk model, and the sectioning of the human body trunk model may facilitate subsequent partial processing of a partial image of the sectioned three-dimensional model. For example, in the design of an orthosis, since the amount of design tasks is large, a model generally needs to be divided into a plurality of persons to perform the design tasks at the same time, and the method can be applied to divide a three-dimensional model into a plurality of partial models to design the three-dimensional model for the plurality of persons at the same time.
In this embodiment, the computer device obtains a spline curve on the surface of the three-dimensional model generated based on the coordinate points input by the user, and projects each mapping coordinate point on the spline curve to the Z axis to obtain a curved surface center point corresponding to each mapping coordinate point. Then the computer equipment obtains a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point, then generates a plurality of sectioning curved surface boundary points distributed on the surface of the three-dimensional model according to the intersection points of the sectioning connecting line and the three-dimensional model, and finally generates a smooth sectioning curved surface according to the plurality of sectioning curved surface boundary points, thereby avoiding the problem of high difficulty in subsequent operation of the three-dimensional model caused by obtaining a serrated sectioning surface by adopting a traditional sectioning mode. Simultaneously because above-mentioned dissect and go on based on the coordinate point of user's input, consequently make dissecting of model can go on according to user's desired angle and shape for dissecting angle and shape are abundanter, and then make user's observation angle abundanter, make the angle of the image that generates abundanter.
Optionally, on the basis of the foregoing embodiment, a possible implementation manner of the foregoing step S10 may be as shown in fig. 3, and includes:
and S11, acquiring a plurality of input coordinate points, wherein the input coordinate points are coordinate points input by a user through an external device.
And S12, performing spline interpolation calculation on each input coordinate point by adopting a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point.
Specifically, the computer device may acquire, as the input coordinate points, a plurality of input coordinate points input by a user through an external device, for example, a coordinate point clicked by a mouse or a coordinate point input by a keyboard. And then the computer equipment performs spline interpolation calculation on the plurality of input coordinate points in a preset smooth mode to obtain interpolation coordinate points corresponding to each input coordinate point, wherein the interpolation coordinate points can be inserted among the input coordinate points. Optionally, the smoothing means includes: any one of cubic B-spline processing, Besses curve processing and CatmulRom curve processing can obtain interpolation coordinate points which are arranged more smoothly and reasonably by adopting the smoothing mode, so that the obtained sectioning surface is smoother, and the operation of the three-dimensional model is simpler and more convenient.
And S13, mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points.
And S14, connecting each mapping coordinate point in a closed mode to form the spline curve.
Specifically, the computer device maps each interpolation coordinate point to a model surface of the three-dimensional model, and may be configured to project each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points, and then close and connect the mapping coordinate points to form a spline curve.
In this embodiment, because the computer device obtains a plurality of input coordinate points and performs spline interpolation calculation on each input coordinate point in a preset smoothing manner, an interpolation coordinate point corresponding to each input coordinate point can be obtained. When the computer equipment maps each interpolation coordinate point to the model surface of the three-dimensional model, a plurality of mapping coordinate points can be obtained, and finally, each mapping coordinate point is connected in a closed mode to form a smooth and reasonable spline curve which can be used as a basis for realizing subsequent smooth cutting of the three-dimensional model, so that the accuracy and the reasonability of three-dimensional model sectioning are further improved, and the sectioned three-dimensional model is more convenient to use in the subsequent calculation process.
Optionally, as shown in fig. 3a, a dot-and-dash line located in the Center represents the Z axis, Point1, Point2, and Point3 are respectively mapping coordinate points located on the model surface, and Center1, Center2, and Center3 are Center points of the curved surface corresponding to Point1, Point2, and Point 3. The curves of Point1, Point2 and Point3 are spline curves.
Optionally, on the basis of each of the foregoing embodiments, the cut surface boundary points include an inner boundary point and an outer boundary point, where the inner boundary point is located on the inner surface side of the three-dimensional model, and the outer boundary point is located on the outer surface side of the three-dimensional model, and one possible implementation manner of the foregoing step S40 may further include: moving the intersection point along the sectioning connecting line to the inner side of the three-dimensional model by a preset distance to obtain the inner side boundary point corresponding to each sectioning connecting line, wherein the inner side boundary point is positioned on the inner side of the surface of the three-dimensional model; and moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer boundary point corresponding to each sectioning connecting line, wherein the outer boundary point is positioned on the outer side of the surface of the three-dimensional model. The distance of the preset distance can be different along with the direction of the sectioning connecting line or the thickness of the inner surface and the outer surface of the three-dimensional model. In this embodiment, the computer device moves the intersection point along the sectioning connection line to the inner side of the three-dimensional model by a preset distance to obtain an inner side boundary point located on the inner side of the surface of the three-dimensional model corresponding to each sectioning connection line; and moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain an outer boundary point of the surface of the three-dimensional model corresponding to each sectioning connecting line, so that the inner boundary point and the outer boundary point of the inner and outer surfaces of the three-dimensional model can be obtained based on the intersection points of the sectioning connecting lines and the three-dimensional model. The method provided by the embodiment can accurately and reasonably generate the boundary point of the sectioning surface on the three-dimensional model according to the intersection point of the sectioning connecting line and the three-dimensional model, so that the accurate and reasonable sectioning surface can be conveniently generated, and the sectioned three-dimensional model can be more conveniently processed in the subsequent operation process.
Optionally, on the basis of the foregoing embodiments, one possible implementation manner of the foregoing step S50 may include: connecting the inner side boundary points and the outer side boundary points at intervals, wherein every two adjacent inner side boundary points and every two adjacent outer side boundary points can form a triangular surface, every two adjacent outer side boundary points and every inner side boundary point can form a triangular surface, and a plurality of triangular surfaces can be formed by connecting the inner side boundary points and the outer side boundary points at intervals; the method in the embodiment can realize the process of generating the surface by points so as to facilitate the subsequent sectioning of the three-dimensional model.
Optionally, one possible implementation manner of the step S13 may further include: converting the interpolation coordinate point into a view coordinate system to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system; converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point; converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point; and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model. Alternatively, the interpolated coordinate point may be obtained by performing interpolation calculation based on a screen coordinate point input by a user through a screen, and a specific process of the coordinate conversion may be as shown in fig. 3 c. In this embodiment, the computer device can convert the interpolation coordinate point representing the trajectory of the coordinate point input by the user to obtain the mapping coordinate point on the three-dimensional model through the coordinate conversion process, so that the computer can perform accurate processing conveniently, and the accuracy of model sectioning is improved.
Optionally, before the step S11, a three-dimensional model initialization process may be further included, which specifically includes: obtaining a model file of the three-dimensional model; initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode; and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points. Specifically, the computer device reads a model file of the three-dimensional model and initializes camera parameters, so that an initial conversion matrix from a model coordinate system to a world coordinate system is constructed, the three-dimensional model is conveniently displayed on the front side in the world coordinate system according to the initial conversion matrix, and a user can conveniently observe the three-dimensional model. And then loading the model file by the computer equipment based on the whole initial conversion matrix so as to facilitate a user to input a plurality of input coordinate points aiming at the three-dimensional model, thereby realizing accurate sectioning of the three-dimensional model.
Optionally, on the basis of the foregoing embodiments, one possible implementation manner of the foregoing step S60 may include: sectioning the three-dimensional model by adopting the sectioning curved surface to obtain at least two three-dimensional submodels; and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying. Specifically, the computer device adopts the sectioning curve to section the three-dimensional model to obtain at least two three-dimensional submodels, and then pushes the three-dimensional submodels to the service front end, so that the service front end packages the three-dimensional submodels into HTML files and returns the HTML files to the user terminal for displaying, and therefore, a user at the service front end can conveniently and visually check the sectioned three-dimensional submodels.
The sectioning method of the three-dimensional model provided by the embodiment of the application can be used for a system as shown in fig. 3d, wherein the system comprises a user side, a service front end and a service rear end, and the user side can comprise a mobile phone, a pad or a PC and the like and sends a request to the service front end; the service front end can be a PC, a server and the like, the service front end and the user side communicate with each other according to a communication protocol, and initiate an initialization request to the service back end to obtain a model file of the three-dimensional model, wherein the model file comprises an STL (standard template library) file, and the model positioning and the model rendering enable the front side of the three-dimensional model to be displayed on a display screen; the service back end can be a PC, a server or the like, the service back end dissects the three-dimensional model by adopting the method described in the embodiment, renders the dissected three-dimensional sub-model and returns the dissected three-dimensional sub-model to the service front end, and the dissected result is returned to the user side by the service front end in an HTML (hypertext markup language) file form, so that the display of the dissected result is completed.
It should be understood that although the various steps in the flow charts of fig. 2-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 4, there is provided a sectioning apparatus of a three-dimensional model, including:
an obtaining module 100, configured to obtain a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
the processing module 200 is configured to project each mapping coordinate point on the spline curve to a Z axis to obtain a curved surface center point corresponding to each mapping coordinate point, and obtain a sectioning connection line according to the mapping coordinate point and the curved surface center point corresponding to the mapping coordinate point;
the generating module 300 is configured to generate a sectioning surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model, and generate the sectioning surface according to the sectioning surface boundary point;
and a sectioning module 400 for sectioning the three-dimensional model along the sectioning curved surface.
In an embodiment, the obtaining module 100 is specifically configured to obtain a plurality of input coordinate points, where the input coordinate points are coordinate points input by a user through an external device; carrying out spline interpolation calculation on each input coordinate point in a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point; mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points; and connecting each mapping coordinate point in a closed mode to form the spline curve.
In one embodiment, the smoothing means comprises: cubic B-spline processing, Besses curve processing, and CatmulRom curve processing.
In one embodiment, the sectioning surface boundary points include an inner boundary point and an outer boundary point, and the generating module 300 is specifically configured to move the intersection point along the sectioning connection line to the inner side of the three-dimensional model by a preset distance, so as to obtain the inner boundary point corresponding to each sectioning connection line; moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer side boundary point corresponding to each sectioning connecting line; wherein the inner boundary point is located inside a surface of the three-dimensional model, and the outer boundary point is located outside the surface of the three-dimensional model.
In one embodiment, the generating module 300 is specifically configured to connect the inside boundary points and the outside boundary points at intervals to form a plurality of triangular surfaces; and splicing the triangular surfaces to form the sectioning curved surface.
In an embodiment, the obtaining module 100 is specifically configured to convert the interpolation coordinate point into a view coordinate system, so as to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system; converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point; converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point; and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model.
In an embodiment, the obtaining module 100 is further configured to obtain a model file of the three-dimensional model; initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode; and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points.
In an embodiment, the sectioning module 400 is specifically configured to adopt the sectioning curve to section the three-dimensional model to obtain at least two three-dimensional submodels; and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying.
For the specific definition of the cutting device for the three-dimensional model, reference may be made to the above definition of the cutting method for the three-dimensional model, which is not described herein again. The various modules in the sectioning apparatus of the three-dimensional model described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
acquiring a plurality of input coordinate points, wherein the input coordinate points are coordinate points input by a user through external equipment;
carrying out spline interpolation calculation on each input coordinate point in a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point;
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and connecting each mapping coordinate point in a closed mode to form the spline curve.
In one embodiment, the smoothing means comprises: cubic B-spline processing, Besses curve processing, and CatmulRom curve processing.
In one embodiment, the sectioning surface boundary points comprise an inner boundary point and an outer boundary point, and the processor when executing the computer program further performs the steps of:
moving the intersection point along the sectioning connecting line to the inner side of the three-dimensional model by a preset distance to obtain the inner side boundary point corresponding to each sectioning connecting line;
moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer side boundary point corresponding to each sectioning connecting line;
wherein the inner boundary point is located inside a surface of the three-dimensional model, and the outer boundary point is located outside the surface of the three-dimensional model.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
connecting the inner boundary points and the outer boundary points at intervals to form a plurality of triangular surfaces;
and splicing the triangular surfaces to form the sectioning curved surface.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
converting the interpolation coordinate point into a view coordinate system to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system;
converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point;
converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point;
and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
obtaining a model file of the three-dimensional model;
initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode;
and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
sectioning the three-dimensional model by adopting the sectioning curved surface to obtain at least two three-dimensional submodels;
and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying.
It should be clear that, in the embodiments of the present application, the process of executing the computer program by the processor is consistent with the process of executing the steps in the above method, and specific reference may be made to the description above.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a plurality of input coordinate points, wherein the input coordinate points are coordinate points input by a user through external equipment;
carrying out spline interpolation calculation on each input coordinate point in a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point;
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and connecting each mapping coordinate point in a closed mode to form the spline curve.
In one embodiment, the smoothing means comprises: cubic B-spline processing, Besses curve processing, and CatmulRom curve processing.
In one embodiment, the sectioning surface boundary points comprise an inner boundary point and an outer boundary point, the computer program when executed by the processor further implementing the steps of:
moving the intersection point along the sectioning connecting line to the inner side of the three-dimensional model by a preset distance to obtain the inner side boundary point corresponding to each sectioning connecting line;
moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer side boundary point corresponding to each sectioning connecting line;
wherein the inner boundary point is located inside a surface of the three-dimensional model, and the outer boundary point is located outside the surface of the three-dimensional model.
In one embodiment, the computer program when executed by the processor further performs the steps of:
connecting the inner boundary points and the outer boundary points at intervals to form a plurality of triangular surfaces;
and splicing the triangular surfaces to form the sectioning curved surface.
In one embodiment, the computer program when executed by the processor further performs the steps of:
converting the interpolation coordinate point into a view coordinate system to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system;
converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point;
converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point;
and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model.
In one embodiment, the computer program when executed by the processor further performs the steps of:
obtaining a model file of the three-dimensional model;
initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode;
and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points.
In one embodiment, the computer program when executed by the processor further performs the steps of:
sectioning the three-dimensional model by adopting the sectioning curved surface to obtain at least two three-dimensional submodels;
and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying.
It should be clear that, in the embodiments of the present application, the process of executing the computer program by the processor is consistent with the process of executing the steps in the above method, and specific reference may be made to the description above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of sectioning a three-dimensional model, the method comprising:
obtaining a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point;
obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model;
generating the sectioning curved surface according to the sectioning curved surface boundary point;
and sectioning the three-dimensional model along the sectioning curve.
2. The method of claim 1, wherein said obtaining spline curves for the three-dimensional model comprises:
acquiring a plurality of input coordinate points, wherein the input coordinate points are coordinate points input by a user through external equipment;
carrying out spline interpolation calculation on each input coordinate point in a preset smoothing mode to obtain an interpolation coordinate point corresponding to each input coordinate point;
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and connecting each mapping coordinate point in a closed mode to form the spline curve.
3. The method of claim 2, wherein the smoothing comprises: cubic B-spline processing, Besses curve processing, and CatmulRom curve processing.
4. The method of any one of claims 1 to 3, wherein the sectioning surface boundary points include an inner boundary point and an outer boundary point, and wherein generating sectioning surface boundary points from intersection points of the sectioning connection lines and the three-dimensional model comprises:
moving the intersection point along the sectioning connecting line to the inner side of the three-dimensional model by a preset distance to obtain the inner side boundary point corresponding to each sectioning connecting line;
moving the intersection point along the sectioning connecting line to the outer side of the three-dimensional model by a preset distance to obtain the outer side boundary point corresponding to each sectioning connecting line;
wherein the inner boundary point is located inside a surface of the three-dimensional model, and the outer boundary point is located outside the surface of the three-dimensional model.
5. The method of claim 4, wherein said generating the cut surface from the cut surface boundary points comprises:
connecting the inner boundary points and the outer boundary points at intervals to form a plurality of triangular surfaces;
and splicing the triangular surfaces to form the sectioning curved surface.
6. The method of claim 2, wherein said mapping each of said interpolated coordinate points to a model surface of said three-dimensional model resulting in a plurality of mapped coordinate points comprises:
converting the interpolation coordinate point into a view coordinate system to obtain a view coordinate point corresponding to the interpolation coordinate point in the view coordinate system;
converting the view coordinate point into a camera coordinate system to obtain a camera coordinate point;
converting the camera coordinate point to a world coordinate system by adopting a view matrix to obtain a world coordinate point;
and converting the world coordinate points into a model coordinate system and performing light projection to obtain the mapping coordinate points on the three-dimensional model.
7. The method of claim 2, wherein prior to obtaining the plurality of input coordinate points, comprising:
obtaining a model file of the three-dimensional model;
initializing camera parameters, and constructing an initial conversion matrix from a model coordinate system to a world coordinate system; the initial conversion matrix is used for displaying the three-dimensional model in the world coordinate system in a front mode;
and loading the model file according to the initial conversion matrix to obtain the plurality of input coordinate points.
8. The method of claim 1, wherein said sectioning the three-dimensional model along the sectioning curve comprises:
sectioning the three-dimensional model by adopting the sectioning curved surface to obtain at least two three-dimensional submodels;
and pushing the three-dimensional submodel to a service front end so that the service front end encapsulates the three-dimensional submodel into a hypertext markup language (HTML) file and returns the HTML file to the user terminal for displaying.
9. A sectioning device for a three-dimensional model, characterized in that it comprises:
the acquisition module is used for acquiring a spline curve of the three-dimensional model; the spline curve is a curve which is generated on the basis of coordinate points input by a user and is positioned on the surface of the three-dimensional model;
the processing module is used for projecting each mapping coordinate point on the spline curve to a Z-axis direction straight line to obtain a curved surface central point corresponding to each mapping coordinate point, and obtaining a sectioning connecting line according to the mapping coordinate point and the curved surface central point corresponding to the mapping coordinate point;
the generating module is used for generating a sectioning curved surface boundary point according to the intersection point of the sectioning connecting line and the three-dimensional model and generating the sectioning curved surface according to the sectioning curved surface boundary point;
and the sectioning module is used for sectioning the three-dimensional model along the sectioning curved surface.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.
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| CN202210886228.XA CN115239911A (en) | 2019-12-27 | 2019-12-27 | Sectioning method and device for three-dimensional model and storage medium |
| CN201911375163.7A CN111161419B (en) | 2019-12-27 | 2019-12-27 | Sectioning method and device for three-dimensional model and storage medium |
| US16/829,208 US11576794B2 (en) | 2019-07-02 | 2020-03-25 | Systems and methods for orthosis design |
| US18/157,787 US11819427B2 (en) | 2019-07-02 | 2023-01-20 | Systems and methods for orthosis design |
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