CN115239911A - 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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- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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Abstract
The application relates to a sectioning method, a sectioning device and a storage medium of a three-dimensional model. The method comprises the following steps: acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model; obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model; generating a target sectioning curved surface according to the sectioning curved surface boundary points; and sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying. By adopting the method, the sawtooth-shaped sectioning surface can be avoided, and the three-dimensional model is sectioned along the smooth sectioning curve, so that the processing difficulty of the three-dimensional model is reduced, and the system resource is saved.
Description
The application is a divisional application of the invention patent application of 'method, device and storage medium for sectioning three-dimensional model', the application date of the original application is 12 months and 27 days in 2019, and the application number is 2019113751637.
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 developed from single visual simulation to physical simulation, and in the reconstruction and visualization of three-dimensional surface models, in order to obtain a desired model shape, any curved surface sectioning operation is often required to be performed on the three-dimensional model.
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 which is dissected by the sectioning operation of the currently adopted triangular mesh model can generate wavy sawteeth, 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 necessary to provide a cutting method, a cutting apparatus, and a storage medium for a three-dimensional model, which can solve the above problems.
In a first aspect, the present application provides a sectioning method of a three-dimensional model, the method comprising:
acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying.
In one embodiment, the target point comprises an input coordinate point, and the obtaining a target curve of the three-dimensional model comprises:
acquiring a plurality of input coordinate points; the input coordinate point is a coordinate point 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;
and obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points obtained by mapping each interpolation coordinate point.
Wherein the smoothing means comprises any one of:
cubic B-spline processing, bezier curve processing, catmulrom curve processing.
In one embodiment, the obtaining a sectioning connection line based on each mapped coordinate point in the target curve includes:
projecting each mapping coordinate point in the target curve to a straight line in a preset direction to obtain a curved surface central point corresponding to each mapping coordinate point;
and obtaining the sectioning connecting line according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point.
In one embodiment, the determining the boundary point of the sectioning surface according to the intersection point of the sectioning connecting line and the three-dimensional model includes:
moving the intersection point to the inner side of the three-dimensional model by a first preset distance along the sectioning connecting line to obtain inner side boundary points corresponding to the sectioning connecting lines;
moving the intersection point to the outer side of the three-dimensional model by a second preset distance along the sectioning connecting line to obtain outer side boundary points corresponding to the sectioning connecting lines;
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 obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points mapped by each interpolation coordinate point includes:
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and closing and connecting the mapping coordinate points to obtain the target curve.
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:
for each interpolation coordinate point, 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 points into a camera coordinate system to obtain camera coordinate points;
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 step of acquiring a plurality of the input coordinate points, the method further includes:
obtaining a model file corresponding to the three-dimensional model;
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 a plurality of input coordinate points.
In one embodiment, the sectioning the three-dimensional model with the target sectioning curve to obtain at least two three-dimensional submodels for displaying includes:
sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels;
generating model display information corresponding to the at least two three-dimensional submodels; the model display information is obtained based on the at least two three-dimensional submodels in an encapsulation mode;
and sending the model display information to a user terminal for display.
In a second aspect, the present application further provides a sectioning device for a three-dimensional model, the device comprising:
the target curve acquisition module is used for acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
the sectioning curved surface boundary point determining module is used for obtaining a sectioning connecting line based on each mapping coordinate point in the target curve and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
the target sectioning curved surface generation module is used for generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and the sectioning display module is used for sectioning the three-dimensional model by adopting the target sectioning curved surface to obtain at least two three-dimensional submodels and displaying the submodels.
In a third aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the sectioning method of a three-dimensional model as described above.
The sectioning method, the sectioning device and the storage medium of the three-dimensional model are characterized in that a target curve of the three-dimensional model is obtained, the target curve is a curve which is generated based on the target point and is positioned on the surface of the three-dimensional model, the three-dimensional model comprises a human trunk model, then a sectioning connecting line is obtained based on each mapping coordinate point in the target curve, a sectioning curved surface boundary point is determined according to the intersection point of the sectioning connecting line and the three-dimensional model, a target sectioning curved surface is generated according to the sectioning curved surface boundary point, the three-dimensional model is sectioned by the target sectioning curved surface, and at least two three-dimensional submodels are obtained and displayed. Therefore, the problem that the subsequent operation difficulty of the three-dimensional model is high due to the fact that the saw-toothed sectioning surface is obtained is solved, the three-dimensional model is sectioned along the smooth sectioning curve, the subsequent calculation difficulty can be reduced, the operation and the processing of the three-dimensional model are more convenient, and the resources of the system are saved.
Drawings
FIG. 1 is a schematic flow diagram of a sectioning method of a three-dimensional model in one embodiment;
FIG. 2a is a schematic representation of a coordinate mapped point and a center point of a curved surface in a three-dimensional model in one embodiment;
FIG. 2b is a schematic view of a cut-away curved surface in one embodiment;
FIG. 3a is a diagram illustrating the flow of coordinate transformation, according to one embodiment;
FIG. 3b is a schematic view of a three-dimensional model sectioning system in one embodiment;
FIG. 4 is a schematic flow diagram of another method for sectioning a three-dimensional model in one embodiment;
FIG. 5 is a block diagram of a device for sectioning a three-dimensional model according to an embodiment;
FIG. 6 is a diagram of the internal structure of a computer device, in one 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.
It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for presentation, analyzed data, etc.) referred to in this application are information and data authorized by the user or sufficiently authorized by each party; correspondingly, the application also provides a corresponding user authorization entrance for the user to select authorization or to select denial.
In an embodiment, as shown in fig. 1, a cutting method for a three-dimensional model is provided, and this embodiment is illustrated by applying the method to a terminal, and it is to be understood that the method may also be applied to a server, and may also be applied to a system including the terminal and the server, and is implemented by interaction between the terminal and the server. In this embodiment, the method includes the steps of:
as an example, the target point may be a coordinate point based on a user input or a feature point obtained by a preset algorithm.
The target curve may be a spline curve of the three-dimensional model, which may be generated based on coordinate points input by a user or feature points obtained by a preset algorithm, and the spline curve may be a closed curve located on the surface of the three-dimensional model.
In practical application, the terminal can use the received coordinate points input by the user or the feature points obtained based on the preset algorithm as target points, and then can calculate according to the target points to automatically generate continuous spline curves positioned on the surface of the three-dimensional model as target curves.
Specifically, a user can input a coordinate point by observing the three-dimensional model displayed on the screen and operating the terminal, for example, a mouse can be used to click the three-dimensional model, and a plurality of coordinate points can be input, or the three-dimensional model can be analyzed based on a preset algorithm to obtain a feature point satisfying a certain condition, for example, a segmentation point obtained by using a segmentation algorithm.
In an example, a coordinate point input by a user may be projected onto a 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 may be the same point, and each projection point may be connected to form a smooth curve as a spline curve (i.e., a target curve).
102, obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
after the target curve is obtained, each mapping coordinate point on the target curve can be projected to a straight line in a preset direction, such as a straight line in the Z-axis direction, a curved surface central point corresponding to each mapping coordinate point is obtained, then a sectioning connecting line can be obtained according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point, and further a sectioning curved surface boundary point can be determined according to the intersection point of the sectioning connecting line and the three-dimensional model.
Specifically, after obtaining the sectioning connecting line based on each mapping coordinate point in the target curve, the sectioning curved surface boundary point may be generated according to an intersection point of the sectioning connecting line and the three-dimensional model, for example, interpolation calculation may be performed on a plurality of intersection points of the sectioning connecting line and the three-dimensional model to obtain a plurality of sectioning curved surface boundary points, optionally, the size of the granularity of the interpolation calculation may be set as needed, and is not particularly limited in this embodiment.
103, generating a target sectioning curved surface according to the sectioning curved surface boundary points;
in a specific implementation, the number of the cut curved surface boundary points may be multiple, and a cut curved surface may be generated as the target cut curved surface according to the multiple cut curved surface boundary points, for example, the multiple cut curved surface boundary points may be smoothly connected, and then the cut curved surface may be obtained,
in an alternative embodiment, the target cut surface may be a closed surface, and the cut surface boundary point may be located on the boundary of the closed surface.
And 104, sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying.
After the target sectioning curved surface is obtained, the target sectioning curved surface can be adopted to section the three-dimensional model to obtain at least two three-dimensional submodels for displaying, for example, by sectioning the human trunk model along the target sectioning curved surface and displaying the three-dimensional submodel obtained by sectioning, partial images of the sectioned three-dimensional model can be further processed correspondingly, and a user can conveniently and visually check the sectioned three-dimensional submodel.
In an example, taking the design of an orthosis as an example, since the design task amount is large, the model needs to be divided into a plurality of persons to perform the design task at the same time, the method can be applied to divide the three-dimensional model, that is, the three-dimensional model is cut to obtain at least two three-dimensional submodels, and then the three-dimensional model can be divided into a plurality of submodels to be designed for the plurality of persons at the same time.
Specifically, the three-dimensional model may be cut along the target cutting curved Surface, and the cut three-dimensional model with a smooth cutting Surface may be obtained by smoothly cutting the three-dimensional model, for example, a clip interface in a Computational Geometry algorithm Library (CGAL Library for short) may be called, the three-dimensional model may be cut according to the target cutting curved Surface, point and Surface information in the cut Surface Mesh may be extracted, polyData may be constructed, rendering may be performed, and further, sub-models (i.e., at least two three-dimensional sub-models) may be obtained after cutting.
Compared with the traditional method, the technical scheme of the embodiment can avoid the problem of high difficulty in subsequent operation of the three-dimensional model caused by the fact that a serrated sectioning surface is obtained by adopting a traditional sectioning mode, and the difficulty in subsequent calculation is greatly reduced by sectioning the three-dimensional model along a smooth sectioning curve, so that the operation and subsequent processing of the three-dimensional model are more convenient, and the resources of the system are greatly saved. Simultaneously owing to dissect and can go on based on user input's coordinate point, can dissect according to user's desired angle and shape for the model and go on, dissect angle and shape are abundanter, can provide abundanter observation angle for the user for the angle of generated image is abundanter.
According to the sectioning method of the three-dimensional model, a target curve of the three-dimensional model is obtained, the target curve is a curve which is generated on the surface of the three-dimensional model based on a target point, the three-dimensional model comprises a human body trunk model, then a sectioning connecting line is obtained based on each mapping coordinate point in the target curve, a sectioning curved surface boundary point is determined according to an intersection point of the sectioning connecting line and the three-dimensional model, a target sectioning curved surface is further generated according to the sectioning curved surface boundary point, the three-dimensional model is sectioned by the target sectioning curved surface, and at least two three-dimensional submodels are obtained and displayed. Therefore, the problem of high difficulty in subsequent operation of the three-dimensional model caused by the fact that the serrated sectioning surface is obtained is solved, the three-dimensional model is sectioned along the smooth sectioning curve, the difficulty in subsequent calculation can be reduced, the three-dimensional model is convenient to operate and process, and resources of the system are saved.
In one embodiment, the target point may comprise an input coordinate point, which may comprise the steps of:
acquiring a plurality of input coordinate points; the input coordinate point is a coordinate point 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; and obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points obtained by mapping each interpolation coordinate point.
Wherein the smoothing means may comprise any one of:
cubic B-spline processing, bezier curve processing, catmulrom curve processing.
In practical application, a plurality of input coordinate points input by a user through external equipment can be acquired, if the coordinate points clicked by a mouse or the coordinate points input by a keyboard are used as the input coordinate points, spline interpolation calculation can be carried out on the plurality of input coordinate points in a preset smooth mode, interpolation coordinate points corresponding to the input coordinate points are obtained, and the interpolation coordinate points can be alternated among the input coordinate points.
For example, by performing spline interpolation calculation on a plurality of input coordinate points by using any one of cubic B-spline processing, bezier curve processing, and catmulrom curve processing, interpolated coordinate points with a smoother and more reasonable arrangement can be obtained, so that the obtained cut surface is smoother, and the calculation of the three-dimensional model is simpler and more convenient.
In an example, each interpolation coordinate point may be mapped to a model surface of the three-dimensional model, for example, each interpolation coordinate point may be projected to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points, and then the mapping coordinate points may be connected in a closed manner to form a spline curve, i.e., a target curve of the three-dimensional model.
In the embodiment, a plurality of input coordinate points are obtained, then spline interpolation calculation is carried out on the input coordinate points in a preset smoothing mode, interpolation coordinate points corresponding to the input coordinate points are obtained, and then a plurality of mapping coordinate points obtained according to mapping of the interpolation coordinate points are obtained to obtain a target curve of the three-dimensional model.
In one embodiment, the obtaining of the sectioning connecting line based on each mapping coordinate point in the target curve may include:
projecting each mapping coordinate point in the target curve to a straight line in a preset direction to obtain a curved surface central point corresponding to each mapping coordinate point; and obtaining the sectioning connecting line according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point.
As an example, the preset direction straight line may be a Z-axis direction straight line, and the Z-axis may be a central axis of the three-dimensional model.
In practical application, each mapping coordinate point can be projected to the Z axis, for example, by keeping the coordinate value in the Z axis direction unchanged, the coordinate values in the X and Y axis directions are changed into 0, a curved surface central point corresponding to each mapping coordinate point can be obtained, and the curved surface central points correspond to the mapping coordinate points one to one; the coordinate values in the X and Y axes may be changed to other preset fixed values, such as the straight line X = a and Y = b.
In an alternative embodiment, the original coordinate system may be transformed to transform the central axis of the three-dimensional model to a new Z-axis, and then coordinate points on the spline curve (i.e. each mapped coordinate point in the target curve) may be projected to the new Z-axis to obtain a curved surface center point, for example, the original coordinate system may be X ' Y ' Z ', and the transformed coordinate system XYZ may be obtained by the transformation, and the central axis of the three-dimensional model may be set to the Z-axis.
In an example, a connecting line of each mapping coordinate point and the corresponding curved surface central point can be used as a sectioning connecting line, and then a plurality of sectioning connecting lines can be obtained, and the sectioning connecting lines are intersected with the three-dimensional model and can have a plurality of intersection points.
For example, as shown in fig. 2a, a dot-and-dash line located at the Center can represent the Z axis, point1, point2, and Point3 are respectively mapping coordinate points located on the surface of the model, and Center1, center2, and Center3 are Center points of the curved surface corresponding to Point1, point2, and Point 3. The curves where Point1, point2 and Point3 are located are spline curves (i.e. target curves).
In this embodiment, each mapping coordinate point in the target curve is projected to a straight line in a preset direction to obtain a curved surface center point corresponding to each mapping coordinate point, and then according to each mapping coordinate point and the curved surface center point corresponding to each mapping coordinate point, a sectioning connection line is obtained, so that data support is provided for subsequent processing.
In one embodiment, the sectioning surface boundary points may include an inner boundary point and an outer boundary point, and the determining the sectioning surface boundary points according to the intersection point of the sectioning connecting line and the three-dimensional model may include:
moving the intersection point to the inner side of the three-dimensional model by a first preset distance along the sectioning connecting line to obtain inner side boundary points corresponding to the sectioning connecting lines; and moving the intersection point to the outer side of the three-dimensional model by a second preset distance along the sectioning connecting line to obtain the outer side boundary point corresponding to each sectioning connecting line.
The inner side boundary point may be located on the inner side of the surface of the three-dimensional model, and the outer side boundary point may be located on the outer side of the surface of the three-dimensional model, for example, the inner side boundary point is located on the inner surface side of the three-dimensional model, and the outer side boundary point is located on the outer surface side of the three-dimensional model.
As an example, the distances of the first preset distance and the second preset distance may be different according to the direction of the cutting connecting line or the thicknesses of the inner surface and the outer surface of the three-dimensional model, and the first preset distance and the second preset distance may be the same or different.
In an example, the intersection point can be moved by a first preset distance towards the inner side of the three-dimensional model along the sectioning connecting line to obtain an inner side boundary point, corresponding to each sectioning connecting line, on the inner side of the surface of the three-dimensional model, the intersection point can be moved by a second preset distance towards the outer side of the three-dimensional model along the sectioning connecting line to obtain an outer side boundary point, corresponding to each sectioning connecting line, on the outer side of the surface of the three-dimensional model, and then the inner side boundary point and the outer side boundary point on the inner surface and the outer surface of the three-dimensional model can be obtained based on the intersection point of the sectioning connecting line and the three-dimensional model.
In the embodiment, the intersection point is moved by the first preset distance along the sectioning connecting line to the inner side of the three-dimensional model to obtain the inner side boundary point corresponding to each sectioning connecting line, and the intersection point is moved by the second preset distance along the sectioning connecting line to the outer side of the three-dimensional model to obtain the outer side boundary point corresponding to each sectioning connecting line.
In one embodiment, the generating a target cut surface according to the cut surface boundary point may include:
connecting the inner boundary points and the outer boundary points at intervals to obtain a plurality of triangular surfaces; and splicing the triangular surfaces to generate the target sectioning curved surface.
In practical application, a plurality of triangular surfaces can be obtained by connecting the inner side boundary points and the outer side boundary points at intervals, if the inner side boundary points and the outer side boundary points can be connected at intervals, every two adjacent inner side boundary points and one outer side boundary point can form one triangular surface, and every two adjacent outer side boundary points and one inner side boundary point can form one triangular surface, and then the plurality of triangular surfaces can be spliced to form an annular sectioning curved surface which is used as a target sectioning curved surface, and if the annular sectioning curved surface formed by the triangular surfaces can be shown in fig. 2 b.
In this embodiment, through with inboard boundary point with outside boundary point is connected alternately, obtains a plurality of triangular surfaces, and then splices a plurality of triangular surfaces, generates the target and dissects the curved surface, can realize the process of generating the face by the point to in the follow-up dissects three-dimensional model.
In one embodiment, the obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points mapped by each interpolation coordinate point may include:
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points; and (4) connecting the mapping coordinate points in a closed manner to obtain the target curve.
In practical application, each interpolation coordinate point can be mapped to the model surface of the three-dimensional model, for example, each interpolation coordinate point can be projected to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points, and then the mapping coordinate points can be connected in a closed manner to form a spline curve, namely, a target curve of the three-dimensional model.
In the embodiment, a plurality of mapping coordinate points are obtained by mapping each interpolation coordinate point to the model surface of the three-dimensional model; and (4) connecting the mapping coordinate points in a closed manner to obtain a target curve, thereby providing a data basis for smooth cutting of the three-dimensional model in the follow-up process.
In one embodiment, the mapping each interpolated coordinate point to a model surface of the three-dimensional model to obtain a plurality of mapped coordinate points may include:
for each interpolation coordinate point, 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.
The interpolation coordinate point can be obtained by interpolation calculation based on the screen coordinate point input by the user through the screen, and the specific process of coordinate conversion can be as shown in fig. 3a, so that the interpolation coordinate point representing the coordinate point track input by the user can be converted into a mapping coordinate point on the three-dimensional model through the coordinate conversion process, accurate processing can be facilitated, and the model sectioning accuracy is improved.
In the embodiment, the interpolation coordinate points are converted into the view coordinate system aiming at each interpolation coordinate point to obtain the view coordinate points corresponding to the interpolation coordinate points in the view coordinate system, then the view coordinate points are converted into the camera coordinate system to obtain the camera coordinate points, the camera coordinate points are converted into the world coordinate system by adopting the view matrix to obtain the world coordinate points, the world coordinate points are converted into the model coordinate system and subjected to light projection to obtain the mapping coordinate points on the three-dimensional model, accurate processing can be facilitated, and the accuracy of model sectioning is improved.
In one embodiment, before the step of acquiring a plurality of the input coordinate points, the following steps may be included:
obtaining a model file corresponding to the three-dimensional model; 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 a plurality of input coordinate points.
In practical application, a model file of a three-dimensional model can be read, camera parameters are initialized, then an initial conversion matrix from a model coordinate system to a world coordinate system can be constructed, so that the three-dimensional model can be displayed on the front side in the world coordinate system according to the initial conversion matrix, observation by a user is facilitated, the model file can be loaded based on the whole initial conversion matrix, the user can input a plurality of input coordinate points aiming at the three-dimensional model, and the three-dimensional model can be accurately cut.
In the embodiment, the model file corresponding to the three-dimensional model is obtained, the initial conversion matrix from the model coordinate system to the world coordinate system is constructed, and the model file is loaded according to the initial conversion matrix to obtain the plurality of input coordinate points, so that the three-dimensional model can be accurately sectioned.
In an embodiment, the sectioning the three-dimensional model with the target sectioning surface to obtain at least two three-dimensional submodels for displaying may include the following steps:
sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels; generating model display information corresponding to the at least two three-dimensional submodels; and sending the model display information to a user terminal for display.
The model display information may be obtained by packaging based on at least two three-dimensional submodels, for example, the three-dimensional submodels may be packaged into a hypertext markup language (HTML) file.
In an example, the three-dimensional model can be sectioned by using the target sectioning curved surface to obtain at least two three-dimensional submodels, and then the three-dimensional submodels can be pushed to the service front end, so that the service front end packages the three-dimensional submodels into hypertext markup language (HTML) files (namely model display information) and returns the HTML files to the user terminal for displaying, and therefore a user at the service front end can conveniently visually check the sectioned three-dimensional submodels.
In yet another example, the sectioning method of the three-dimensional model provided by this embodiment may be used in a system as shown in fig. 3b, where the system may include a user end, a service front end, and a service back end, where the user end may include a mobile phone, a pad, or a PC, which may be used to send 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 can communicate 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 initialization request comprises reading an STL (standard template library) file, and the three-dimensional model can be displayed on a display screen in front through model positioning and model rendering; the service back end can be a PC, a server or the like, the service back end can adopt the method described in the embodiment to dissect the three-dimensional model, render the dissected three-dimensional sub-model and return the dissected three-dimensional sub-model to the service front end, and then the service front end can return the dissected result to the user side in an HTML file form to complete the display of the dissected result.
In this embodiment, dissect the curved surface through adopting the target and dissect the three-dimensional model, obtain two at least three-dimensional submodels, then generate the model show information that two at least three-dimensional submodels correspond, and then send model show information to user terminal in order to demonstrate, can be convenient for the user to dissect the three-dimensional submodel after directly perceivedly look over.
In one embodiment, as shown in FIG. 4, a flow diagram of another method of sectioning a three-dimensional model is provided. In this embodiment, the method includes the steps of:
in step 401, a plurality of input coordinate points are acquired; the input coordinate point is a coordinate point input by a user through an external device. In step 402, spline interpolation calculation is performed on each input coordinate point in a preset smoothing manner to obtain an interpolation coordinate point corresponding to each input coordinate point. In step 403, a target curve of the three-dimensional model is obtained from a plurality of mapping coordinate points mapped by each interpolation coordinate point. In step 404, each mapping coordinate point in the target curve is projected to a straight line in a preset direction, so as to obtain a curved surface center point corresponding to each mapping coordinate point. In step 405, a cutting connecting line is obtained according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point. In step 406, a sectioning surface boundary point is determined according to the intersection point of the sectioning connecting line and the three-dimensional model, wherein the sectioning surface boundary point comprises an inner boundary point and an outer boundary point. In step 407, a target cut surface is generated from the cut surface boundary points. In step 408, the three-dimensional model is sectioned by using the target sectioning surface to obtain at least two three-dimensional submodels and displayed. It should be noted that, the specific definition of the above steps may refer to the specific definition of the cutting method of a three-dimensional model, and will not be described herein again.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence 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 a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the application also provides a three-dimensional model sectioning device for realizing the three-dimensional model sectioning method. The implementation scheme of the device for solving the problem is similar to the implementation scheme recorded in the method, so that specific limitations in the following embodiment of the sectioning device for one or more three-dimensional models can be referred to the limitations of the sectioning method for three-dimensional models, and are not described herein again.
In one embodiment, as shown in fig. 5, there is provided a sectioning apparatus of a three-dimensional model, including:
a target curve obtaining module 501, configured to obtain a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
a sectioning surface boundary point determining module 502, configured to obtain a sectioning connecting line based on each mapping coordinate point in the target curve, and determine a sectioning surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
a target sectioning curved surface generating module 503, configured to generate a target sectioning curved surface according to the sectioning curved surface boundary point;
and a sectioning display module 504, configured to adopt the target sectioning curved surface to section the three-dimensional model, so as to obtain at least two three-dimensional submodels and display the submodels.
In one embodiment, the target point includes an input coordinate point, and the target curve obtaining module 501 includes:
an input coordinate point acquisition submodule for acquiring a plurality of input coordinate points; the input coordinate point is a coordinate point input by a user through external equipment;
an interpolation coordinate point obtaining submodule, configured to perform spline interpolation calculation on each input coordinate point in a preset smoothing manner, so as to obtain an interpolation coordinate point corresponding to each input coordinate point;
the target curve obtaining submodule is used for obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points obtained by mapping each interpolation coordinate point;
wherein the smoothing means comprises any one of:
cubic B-spline processing, bezier curve processing, catmulrom curve processing.
In one embodiment, the cut surface boundary point determining module 502 includes:
the curved surface central point obtaining submodule is used for projecting each mapping coordinate point in the target curve to a straight line in a preset direction to obtain a curved surface central point corresponding to each mapping coordinate point;
and sectioning the connecting line to obtain a submodule, wherein the submodule is used for obtaining the sectioning connecting line according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point.
In one embodiment, the cut surface boundary points may include an inner boundary point and an outer boundary point, and the cut surface boundary point determining module 502 includes:
the inner side boundary point obtaining submodule is used for moving the intersection point to the inner side of the three-dimensional model by a first preset distance along the sectioning connecting line to obtain the inner side boundary point corresponding to each sectioning connecting line;
the outer side boundary point submodule is used for moving the intersection point to the outer side of the three-dimensional model by a second preset distance along the sectioning connecting line 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 target curve derivation sub-module includes:
a mapping coordinate point obtaining unit, configured to map each interpolation coordinate point to a model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and the mapping coordinate point connecting unit is used for connecting the mapping coordinate points in a closed manner to obtain the target curve.
In one embodiment, the mapping coordinate point obtaining unit includes:
the view coordinate point obtaining subunit is configured to convert, for each interpolation coordinate point, 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;
the camera coordinate point obtaining subunit is used for converting the view coordinate points into a camera coordinate system to obtain camera coordinate points;
the world coordinate point obtaining subunit is used for converting the camera coordinate point into a world coordinate system by adopting a view matrix to obtain a world coordinate point;
and the light projection subunit is used for 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 apparatus further comprises:
the model file acquisition module is used for acquiring a model file corresponding to the three-dimensional model;
the initial transformation matrix building module is used for building an initial transformation 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 the input coordinate point obtaining module is used for loading the model file according to the initial conversion matrix to obtain a plurality of input coordinate points.
In one embodiment, the cut-away display module 504 includes:
the three-dimensional submodel obtaining submodule is used for sectioning the three-dimensional model by adopting the target sectioning curved surface to obtain at least two three-dimensional submodels;
the packaging sub-module is used for generating model display information corresponding to the at least two three-dimensional sub-models; the model display information is obtained based on the at least two three-dimensional submodels in an encapsulation mode;
and the display submodule is used for sending the model display information to a user terminal for display.
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, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by 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 and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of sectioning a three-dimensional model. 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.
Those skilled in the art will appreciate that the architecture shown in fig. 6 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.
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:
acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying.
In an embodiment, the processor when executing the computer program further realizes the steps of the method for sectioning a three-dimensional model in the other embodiments described 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:
acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying.
In an embodiment the computer program, when executed by the processor, further realizes the steps of the method for sectioning of a three-dimensional model in the other embodiments described above.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and sectioning the three-dimensional model by adopting the target sectioning surface to obtain at least two three-dimensional submodels and displaying.
In an embodiment, the computer program, when executed by the processor, further realizes the steps of the method for sectioning a three-dimensional model in the other embodiments described 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, databases, or other media used in the embodiments provided herein can include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases involved in the embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the various embodiments provided herein may be, without limitation, general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, or the like.
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 present application. 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, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims (10)
1. A method of sectioning a three-dimensional model, the method comprising:
acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
obtaining a sectioning connecting line based on each mapping coordinate point in the target curve, and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels and displaying.
2. The method of claim 1, wherein the target point comprises an input coordinate point, and wherein obtaining a target curve for the three-dimensional model comprises:
acquiring a plurality of input coordinate points; the input coordinate point is a coordinate point 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;
and obtaining a target curve of the three-dimensional model according to a plurality of mapping coordinate points obtained by mapping each interpolation coordinate point.
Wherein the smoothing means comprises any one of:
cubic B-spline processing, bezier curve processing, catmulrom curve processing.
3. The method of claim 1, wherein deriving a sectioning connection line based on each mapped coordinate point in the target curve comprises:
projecting each mapping coordinate point in the target curve to a straight line in a preset direction to obtain a curved surface central point corresponding to each mapping coordinate point;
and obtaining the sectioning connecting line according to each mapping coordinate point and the curved surface central point corresponding to each mapping coordinate point.
4. The method of claim 1, wherein the sectioning surface boundary points comprise an inner boundary point and an outer boundary point, and wherein determining the sectioning surface boundary points from the intersection of the sectioning connection line and the three-dimensional model comprises:
moving the intersection point to the inner side of the three-dimensional model by a first preset distance along the sectioning connecting line to obtain inner side boundary points corresponding to the sectioning connecting lines;
moving the intersection point to the outer side of the three-dimensional model by a second preset distance along the sectioning connecting line 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 2, wherein said mapping a plurality of mapped coordinate points from each of said interpolated coordinate points to obtain a target curve of said three-dimensional model comprises:
mapping each interpolation coordinate point to the model surface of the three-dimensional model to obtain a plurality of mapping coordinate points;
and (4) connecting the mapping coordinate points in a closed manner to obtain the target curve.
6. The method of claim 5, wherein mapping each of the interpolated coordinate points to a model surface of the three-dimensional model resulting in a plurality of mapped coordinate points comprises:
for each interpolation coordinate point, 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 the step of obtaining the plurality of input coordinate points, the method further comprises:
obtaining a model file corresponding to the three-dimensional model;
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 a plurality of input coordinate points.
8. The method according to any one of claims 1 to 7, wherein the sectioning the three-dimensional model with the target sectioning surface to obtain at least two three-dimensional submodels and displaying the submodels comprises:
sectioning the three-dimensional model by adopting the target sectioning curve to obtain at least two three-dimensional submodels;
generating model display information corresponding to the at least two three-dimensional submodels; the model display information is obtained based on the at least two three-dimensional submodels in a packaging mode;
and sending the model display information to a user terminal for display.
9. A sectioning device for a three-dimensional model, characterized in that it comprises:
the target curve acquisition module is used for acquiring a target curve of the three-dimensional model; the target curve is a curve which is generated based on a target point and is positioned on the surface of the three-dimensional model, and the three-dimensional model comprises a human body trunk model;
the sectioning curved surface boundary point determining module is used for obtaining a sectioning connecting line based on each mapping coordinate point in the target curve and determining a sectioning curved surface boundary point according to an intersection point of the sectioning connecting line and the three-dimensional model;
the target sectioning curved surface generation module is used for generating a target sectioning curved surface according to the sectioning curved surface boundary points;
and the sectioning display module is used for sectioning the three-dimensional model by adopting the target sectioning curved surface to obtain at least two three-dimensional submodels and displaying the submodels.
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 according to any one of claims 1 to 8.
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