CN117351170A - A method and system for realizing regional 3D model replacement - Google Patents

Abstract

The invention relates to a method and a system for realizing the replacement of a regional three-dimensional model, wherein the replacement method comprises the following steps: constructing a replacement space which partially or completely contains a plurality of three-dimensional models in the three-dimensional scene; screening the plurality of three-dimensional models in the replacement space to determine an original model to be replaced, wherein the original model can comprise a first original model with all vertexes and lines ending in the replacement space and a second original model with partial vertexes and lines ending in the replacement space; a replacement model is acquired in response to a replacement requirement to replace each original model with a replacement model, when the replacement is performed, an original model in a replacement space in the three-dimensional scene is selected, a model file of each replacement model used for replacing the original model is selected from a three-dimensional model database, and the center positions and orientations of each replacement model in the model file and each original model in the three-dimensional scene are determined through analysis, so that all original models in the three-dimensional scene are replaced by each replacement model based on the determined center positions and orientations.

Description

A method and system for realizing regional 3D model replacement

Technical field

The present invention relates to the technical field of computer graphics processing, and in particular to a method and system for realizing regional three-dimensional model replacement.

Background technique

Currently, there are many related technologies in the field of 3D scene editing and replacement, but most of them need to be processed manually, including: CAD/CAM technology: Computer-aided design and manufacturing technology has been widely used in the editing of 3D models. In the field of 3D modeling and replacement, CAD/CAM technology can be used to implement parametric modification and replacement operations on 3D models; 3D modeling software: Existing 3D modeling software can implement editing and replacement of 3D scenes. For example, software such as 3dsMax and Maya can edit and replace 3D models. The specific implementation method is generally to manually select 3D model nodes, delete/hide them, and finally insert the new model into the scene.

Chinese patent application CN109410346A discloses a system for online editing of three-dimensional architectural models, including a user interactive interface, an image conversion module, an image inspection module, an image calculation module, a three-dimensional model reconstruction module, and a three-dimensional model online real-time rendering interactive module; among which, the user interactive interface It is used to input, edit and modify parameters of CAD drawings online; the image conversion module is used to convert CAD drawings into vector drawings; the image inspection module is used to check closed areas in vector drawings; the image calculation module is used to calculate the CAD drawings based on the CAD drawings. The parameters and closed areas in the file are calculated, and the closed area is modeled and meshed; the 3D model reconstruction module is used to combine multiple calculated images to reconstruct the 3D model; the 3D model online real-time rendering interactive module is used Display and interact with 3D building models on the web.

Although existing related technologies can edit and replace three-dimensional scenes, the replacement steps are generally cumbersome. Specific steps usually include: (1) Manually selecting model nodes and deleting them; (2) Re-importing the replaced new model; ( 3) Adjust the position of the replacement model according to the replacement position. In the process of manually selecting nodes to perform deletion, replacement, and adjustment operations, you may encounter problems such as large data volume, incomplete selection, and unclean deletion. If the amount of data generated by the above process is too large, you need to filter and determine what is needed in the directory tree. model nodes (because the models in an area are often very scattered in the directory tree, so you need to manually select multiple items or use filtering tools to filter. However, most software cannot perfectly support filtering), and the replacement efficiency is too low, and Quick replacement cannot be completed for models in the specified area.

In summary, the current 3D model replacement technology is mainly designed from the perspective of model editing and based on the basic functions of select-delete-import, without fully considering business needs. In view of this, it is urgent to propose a model replacement method to allow users to edit and replace models in three-dimensional scenes more quickly and efficiently.

In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, all details and contents are not listed in detail. However, this is by no means The present invention does not have these features of the prior art. On the contrary, the present invention already has all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art.

Contents of the invention

In view of the shortcomings of the existing technology, the present invention provides a method and system for realizing regional three-dimensional model replacement, aiming to solve at least one or more technical problems existing in the existing technology.

In order to achieve the above objectives, the present invention provides a method for realizing regional three-dimensional model replacement, which includes the following steps:

Construct a replacement space that partially or fully contains several three-dimensional models in a three-dimensional scene;

Filter several three-dimensional models in the replacement space to determine the original model to be replaced;

Replacement models are obtained in response to replacement requirements to replace each original model with a replacement model.

Compared with the existing technology, which mostly performs scene editing and replacement manually, the present invention is aimed at the editing and replacement of delineated spatial areas in three-dimensional scenes. In the present invention, the designated/delimited spatial area only needs to be edited and replaced manually. Forming a spatial geometry or spatial envelope in the three-dimensional space can quickly filter out the required original model nodes, and directly replace the model in the area. It also supports users to make a secondary selection of the replacement model to perform preview. , inspection and adjustment operations. On the contrary, most of the current existing technologies require manual selection one by one in the model directory tree. When the required nodes in the model directory tree are scattered or large in size, manual selection is time-consuming, laborious and inaccurate. , while the node search function in the prior art cannot filter models that default to a lot of information. The model replacement method of the present invention provides the function of customizing area divisions, allowing users to plan a certain range, eliminating the need for users to manually select multiple The process of model nodes, and there are no requirements for model node names and node attributes. As long as there is a three-dimensional model, it can be filtered.

The three-dimensional model building process in the prior art is to build a three-dimensional model step by step through dotting, wiring, paving, and integration. For example, the prior art CN111223177A discloses a method and device for constructing a three-dimensional model in a three-dimensional space, by acquiring a two-dimensional panoramic image of the three-dimensional space and the four vertices of the first surface of the three-dimensional space in the coordinate system of the two-dimensional panoramic image coordinates; project the four vertices of the first surface into the three-dimensional projection space based on the coordinates of the four vertices of the first surface in the coordinate system of the two-dimensional panoramic image to obtain the four vertices of the first surface in the three-dimensional projection space four first projection points in; perform coplanar correction on the four first projection points to obtain four second projection points of the four vertices of the first surface in the three-dimensional projection space based on the four first projection points; Obtain the four vertices of the first surface of the three-dimensional model based on the four second projection points; obtain the three-dimensional model based on the four vertices of the first surface of the three-dimensional model and the height along the first coordinate axis of the three-dimensional space projected in the three-dimensional projection space The four vertices of the second surface, the points, lines, surfaces, and the final three-dimensional model entity have a hierarchical and continuous model directory tree structure, in which each model element is established in a specific editing order. Therefore, if it is necessary to replace part of the three-dimensional model created in this way, the existing conventional technical method is usually to directly select the point, line, surface or part of the three-dimensional solid model that needs to be replaced. At this time, the selected model to be replaced There is a cross-order problem in the model directory tree structure, that is, the selected replacement section has the problem of spanning multiple tree branch structures and multiple editing orders. This will also disrupt the editing order in the model directory tree. Once the model directory tree is in When there is discontinuity in the editing sequence, it will directly affect the post-combined rendering of the 3D model, thereby increasing the data calculation processing volume of the replaced 3D model. On the other hand, the order of the 3D model directory tree after replacement in this way will change, and the node selection function that searches based on the editing order will also have breakpoints, making it impossible to conduct a comprehensive node search, resulting in node search information Missing part in model replacement. Different from the above-mentioned prior art, the present invention uses the spatial area in the three-dimensional scene as the editing and replacement object, so that the specific elements that need to be edited and replaced in the three-dimensional model can be included in this part of the spatial area, thus eliminating the need for the model directory tree. The impact of the editing sequence in the 3D model editing and replacement process will further significantly reduce the impact of changes in specific elements such as points, lines, and surfaces of the 3D model on the overall 3D model during the 3D model editing and replacement process. processing volume.

It is understandable that when part of the content in the 3D model needs to be edited and replaced, the existing conventional processing method requires selecting the specific entity elements in the 3D model that need to be edited and replaced, such as points, lines, surfaces, etc., and selecting Some elements need to be positioned through a certain reference coordinate system. The usual reference coordinate system is the coordinate system determined when the three-dimensional model is initially established. At this time, the location of the selected elements that need to be replaced is determined based on the reference coordinate system. , different features have completely different coordinate information. When the model to be replaced needs to be added to the original model, each element of the model to be replaced needs to be assigned coordinate information corresponding to the selected element that needs to be replaced, and included in the model directory tree of the new model. , this process requires corresponding data operations and processing on the coordinate information of each element, thus significantly increasing the processing volume of data operations. On the contrary, the present invention limits the elements that need to be edited and replaced in the form of spatial areas, so that all relevant elements of the target model that need to be edited and replaced are processed in a unified "packaged" data form, eliminating the need for The step of processing coordinate information for each element significantly reduces the amount of data that needs to be processed for coordinate information. At this time, the spatial area that needs to be edited and replaced exists in the original three-dimensional model as a related aggregate. The position information of this spatial area only needs to be determined through a single operation, thereby providing the information that needs to be edited and replaced. Accurate position information greatly improves the data processing efficiency of 3D model editing and replacement, especially by forming a spatial geometry or spatial envelope in the 3D space to avoid model editing and replacement operations caused by editing sequence information in the model directory tree. Increased throughput.

Preferably, constructing a replacement space that partially or fully contains several three-dimensional models in a three-dimensional scene includes:

Constructing at least one planar area in the three-dimensional scene, the planar area being located on at least one projection plane shared by several three-dimensional models to be replaced;

Determine the expansion height of the plane area based on the maximum envelope height of the projection surface along the normal direction;

A replacement space is formed based on the extended height.

Preferably, filtering several three-dimensional models in the replacement space to determine the original model to be replaced includes:

Determine the three-dimensional model in which all vertices and lines end in the replacement space as the first original model to be replaced;

A three-dimensional model in which some vertices and lines end in the replacement space is determined as the second original model to be replaced.

Preferably, when the three-dimensional model is the first original model with both vertices and edges located in the replacement space, the replacement step includes:

Select all the first original models in the replacement space in the three-dimensional scene;

Selecting model files for each replacement model to replace the first original model from the three-dimensional model database;

Analyze and determine the center position and orientation of each replacement model in the model file and each first original model in the three-dimensional scene;

All first original models in the three-dimensional scene are replaced with respective replacement models based on the determined center position and orientation.

Preferably, when the three-dimensional model is a second original model with some vertices and edges located in the replacement space, the replacement step includes:

Select at least one three-dimensional model section in the three-dimensional scene where the three-dimensional model penetrates or is partially embedded in the replacement space;

Determining a point or line of at least one three-dimensional model segment that intersects the replacement space envelope as the vertex and/or the outermost line of the replacement three-dimensional model segment;

identifying the alternative three-dimensional model segment as the second original model;

Selecting model files for each replacement model to replace the second original model from the three-dimensional model database;

Analyze and determine the center position and orientation of each replacement model in the model file and each second original model in the three-dimensional scene;

The second original model in the three-dimensional scene is replaced with each replacement model based on the determined center position and orientation.

Preferably, analyzing and determining the center position and orientation of each replacement model in the model file and each first original model or second original model in the three-dimensional scene also includes:

Analyze and determine the center position and orientation of the unit replacement space of each replacement model and each first original model or second original model in the three-dimensional scene. Compared with box-selecting multiple models, since the model bounding box (i.e., the unit replacement space) is a more regular geometry, the calculation of its center position coordinates and orientation vector requires less computation, making it possible to achieve one-time quick paste replacement, which is significantly more efficient. for a large number of three-dimensional models.

Preferably, obtaining the replacement model to replace each original model with the replacement model in response to the replacement requirement further includes:

Determine the arrangement position of the corresponding replacement model in the replacement space based on the relative geometric positions of all original models to each other;

Each replacement model is used to replace the original model in the three-dimensional scene based on the determined layout position.

Since the calculation required for year-on-year scaling is jointly calculated based on all replacement models in the three-dimensional space, it does not require separate analysis of each vertex and line (which may include calculations that traverse a large number of nodes, which consumes a lot of memory) ), and the replacement method provided by the present invention does not require traversing each node, so it can replace a large number of three-dimensional models at one time. Moreover, the replacement method brought about by year-on-year scaling requires very little manual adjustment in the future. It can be understood that when conventional technical means in the prior art are used to adjust the range of the 3D model that needs to be edited and replaced, the selected target elements are actual 3D model components such as points, lines, and surfaces, and the range adjustment of a single element is only It involves the change of the feature in its extension direction and does not extend to the scope adjustment of other features. If a large-scale editing and replacement of a 3D model is required, independent operations must be performed on each single element, and different elements may have completely different extension directions, resulting in different elements that need to be adjusted. The amount of operations is also significantly different, so it is impossible to improve the efficiency of data operation processing through a unified operation processing method. On the contrary, by limiting different elements to the same spatial area, the present invention only needs to adjust the data of the expansion range of the space to meet the expected range adjustment, and can adjust the calculation of the range of different elements. The processing process is unified into a single spatial area adjustment operation process, thereby avoiding the need to separately operate different elements in the 3D model, and significantly reducing the computational workload of editing and replacing the 3D model.

Preferably, the method for realizing regional three-dimensional model replacement provided by the present invention also includes:

A replacement list for replacement is provided in combination with the model file of each selected replacement model to allow the user to determine the correspondence between the replacement model and the original model based on the replacement list and perform manual replacement of the replacement model.

Preferably, the maximum envelope height of the present invention is greater than or equal to the location of the vertex or line with the largest normal height in several three-dimensional models to be replaced.

Preferably, the present invention also relates to a system for realizing regional three-dimensional model replacement, which system includes:

Building module, used to construct a replacement space that partially or fully contains several three-dimensional models in a three-dimensional scene;

The determination module is used to filter several three-dimensional models in the replacement space to determine the original model to be replaced;

An execution module is configured to obtain replacement models in response to replacement requirements to replace each original model with a replacement model.

Description of drawings

Figure 1 is one of the schematic diagrams of the spatial positions of the original model and the replacement model in the replacement space according to a preferred embodiment of the present invention;

Figure 2 is a second schematic diagram of the spatial positions of the original model and the replacement model in the replacement space according to a preferred embodiment of the present invention;

Figure 3 is a schematic flowchart of a method for realizing regional three-dimensional model replacement according to a preferred embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined. Although exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein.

Example 1

The embodiment of the present invention provides a method for realizing regional three-dimensional model replacement, which may include the following steps:

Construct a replacement space that partially or completely contains several 3D models in a 3D scene.

Filter several three-dimensional models in the replacement space to determine the original model to be replaced.

Replacement models are obtained in response to replacement requirements to replace each original model with a replacement model.

In particular, in the present invention, the original model can be understood as the three-dimensional model to be replaced in the constructed replacement space or spatial envelope. The replacement model can be understood as a three-dimensional model used to replace the original model in the constructed replacement space or space envelope. In other words, a replacement model is used to replace the original model at the corresponding location in the replacement space or space envelope.

Figure 1 shows one example of the spatial positions of the original model and the replacement model in the replacement space. The dotted box shown in Figure 1 can represent the replacement space according to the present invention. The replacement space may be formed by stretching a planar area surrounding all vertices and lines of "several three-dimensional models" on at least one projection plane. For example, the replacement space can be formed by extending the bottom surface along the height direction where the vertical projections of several original models shown in Figure 1 are located. Further, the replacement space partially or completely contains one or more three-dimensional models to be replaced (i.e., original models). When the replacement model is used to replace the original model, the replacement operation is performed in the replacement space. It should be understood that although Figure 1 shows a specific shape example of the replacement space, it is only used as a non-limiting example. In some embodiments, the replacement space can be a part other than Figure 1 Or any regular or irregular spatial geometry that entirely encompasses several three-dimensional models.

According to a preferred embodiment, in the present invention, the step of constructing a replacement space that partially or fully includes several three-dimensional models in a three-dimensional scene may include:

At least one planar area is constructed in the three-dimensional scene, and the planar area is located on at least one projection plane shared by several three-dimensional models to be replaced.

The expansion height of the planar area is determined based on the maximum envelope height of the projection surface along the normal direction.

The replacement space is formed based on the extended height.

Specifically, first, the plane area is located on at least one projection plane shared by several three-dimensional models to be replaced, and the plane area surrounds all vertices and lines of the "several three-dimensional models to be replaced" on the at least one projection plane; secondly, , the expansion height of the plane area is determined based on the maximum envelope height of the "several three-dimensional models to be replaced" along the normal direction from the at least one projection surface, that is, the expansion height of the plane area in another direction (such as the vertical direction) The height required for growth is "grown and stretched" according to the expanded height, thereby forming a spatial geometry or spatial envelope, which is used as the replacement space. The purpose of planning the replacement space is to select several objects to be replaced. 3D model. In particular, the three-dimensional model whose vertices and lines completely terminate in the replacement space is also referred to as the first original model below. Preferably, in the present invention, the maximum envelope height is greater than or equal to the location of the vertex or line with the maximum normal height in several three-dimensional models to be replaced.

Generally speaking, the user first manually creates a plane area, and then the system processor (Central Processing Unit, CPU) calculates and analyzes based on the determined plane area to form a spatial geometry or spatial envelope that surrounds several three-dimensional models to be replaced. For ease of understanding, this spatial geometry or spatial envelope is called a replacement space in the present invention.

In particular, the selection or creation of a planar area can be accomplished using the area selection tool in the system or platform equipped with this method, similar to the rectangular selection tool, polygon selection tool, etc. in existing modeling software. You can use the rectangular selection tool to select a model within a rectangular area by dragging the cursor on the graphical user interface. This selection method is suitable for selecting larger areas. The polygon selection tool allows you to select a model within a polygonal area by dragging the cursor on the graphical user interface. This selection method is suitable for selecting irregularly shaped areas. It can be understood that the above-mentioned method of creating a planar area is only used as a non-limiting example and should not be regarded as a specific limitation of the present invention. Those skilled in the art can also create the planar area through other well-known means not disclosed herein. flat area.

The planar area and its corresponding replacement space shown in Figure 1 are regular cubes. In other optional embodiments, the planar area and its corresponding replacement space may be irregular spatial geometries. Specifically, when using a planar area and its corresponding replacement space to select several three-dimensional models to be replaced, the shape of the replacement space can be confirmed based on the shape of one or more three-dimensional models at the boundary of the replacement space. For example, if a three-dimensional model contained in one of the enclosing surfaces of one side of the replacement space is an arc relative to the outline of that side, then part or all of the enclosing surface of the replacement space on that side can be a shape adapted to the arcuate outline of the three-dimensional model. (like an arc). Alternatively, if the top surface of the three-dimensional model with the maximum normal height contained in the replacement space is a conical surface, then part or all of the top surrounding surface of the three-dimensional model relative to the replacement space can be a conical outline adapted to the three-dimensional model. shape (such as cone). From this, various forms of replacement spaces can be constructed to contain several types of three-dimensional models. In particular, confirming the shape of the replacement space based on the shape of one or more 3D models at the outer boundary of the replacement space can avoid selecting too many useless spaces (such as areas where there are no 3D models), and at the same time reduce the number of selected areas that may not require replacement. Model segments are placed in replacement spaces, thereby increasing the amount of calculations the system processes.

According to a preferred embodiment, in the present invention, screening several three-dimensional models in the replacement space to determine the original model to be replaced includes:

The three-dimensional model in which all vertices and lines end in the replacement space is determined as the first original model to be replaced.

A three-dimensional model in which some vertices and lines end in the replacement space is determined as the second original model to be replaced.

Specifically, each three-dimensional model is usually a spatial three-dimensional structure composed of several faces, and each face included in the spatial three-dimensional structure is composed of a corresponding vertex and a connection between the vertices. Therefore, each 3D model contains several vertices and edges. Further, in the determined replacement space, the spatial geometric relationship between each three-dimensional model and the replacement space usually includes one or more three-dimensional models being completely included in the replacement space, or one or more three-dimensional models being partially included in the replacement space. . In view of this, the three-dimensional model with all vertices and lines ending in the replacement space is determined as the first original model to be replaced; the three-dimensional model with some vertices and lines ending in the replacement space is determined as the second original model to be replaced. original model. Correspondingly, when using a replacement model to replace or replace a three-dimensional model in the replacement space (ie, the original model), it at least involves replacing all or only part of each three-dimensional model in the replacement space.

According to a preferred embodiment of the present invention, obtaining a replacement model to replace each original model in response to a replacement requirement includes selecting a local model to generate a replacement model in response to a replacement requirement input by a user. That is, the corresponding replacement model is selected from the three-dimensional model database according to the user's needs. Furthermore, by comparing the differences between the original model and the replacement model, the parts that need to be replaced can be determined.

According to a preferred embodiment of the present invention, in the first situation where all vertices and edges of the original model are located in the replacement space (that is, the three-dimensional model is the first original model with both vertices and edges located in the replacement space). (below), the replacement steps include:

P1 selects all original models within the replacement space (i.e., the first original model) in the three-dimensional scene.

P2 selects the corresponding model file (one or more files) of each replacement model to replace all original models from the three-dimensional model database.

P3 analysis determines the center position and orientation of each replacement model in the corresponding model file and each original model in the three-dimensional scene.

P4 replaces all original models in the three-dimensional scene with each replacement model.

According to a preferred embodiment, the "replacement" operation in step P4 in the first scenario further includes: determining the center position and orientation of the corresponding replacement model according to the center position and orientation of each original model, so as to determine the center position and orientation of the corresponding original model according to the center position and orientation of each original model. Center position and orientation to arrange each replacement model in the 3D scene. In other words, the center position and/or orientation vector of the original model and the replaced replacement model in the replacement space are kept consistent.

According to a preferred embodiment, after step P2 in the first aspect of the present invention, it also includes: providing the user with a replacement list for replacement in combination with the model file of the selected replacement model, and the replacement list is used for the user to manually determine the replacement. Correspondence between the model and the original model, and allows the user to perform replacement manually. For example, the user can manually select the replacement model node, and select whether the replacement model node should be replaced in detail. Further, in the process of replacing or replacing the original model with the replacement model, the user is allowed to decide whether to delete or hide the original model from the scene.

According to a preferred embodiment, in step P3 described in the first aspect of the present invention, when analyzing and determining the center position and orientation of the replacement model and the original model, the center position of the bounding box of the replacement model and the original model can be determined by and orientation instead. In other words, the import or replacement position of the replacement model can be determined by analyzing and determining the correspondence between the center position and orientation of each replacement model and each original model (i.e., the first original model or the second original model) in the unit replacement space in the three-dimensional scene. . Specifically, based on the determined one or more original models, the model bounding box (or the first unit replacement space) of the entire original model is obtained, using the first center coordinate system of the model bounding box as a reference. Further, obtain the second center coordinate system of the model bounding box (or the second unit replacement space) of the replacement model to be imported, and overlap the two coordinate systems (i.e., the first center coordinate system and the second center coordinate system), so as to As the import basis for the replacement model replacement position.

In particular, there can be one unit of replacement space for each original model and replacement model. For example, each original model or replacement model in the dotted box shown in Figure 1 has a minimum replacement space (not shown in the figure). This minimum replacement space is similar to a bounding box (such as a cubic structure) contained in the previous article. within the replacement space, and the minimum replacement space has the minimum spatial geometric size that can completely contain the corresponding original model or replacement model. Therefore, the corresponding relationship between the center position and orientation of the unit replacement space corresponding to each original model and the replacement model is compared and analyzed to determine the replacement/import position of the replacement model.

In some optional implementations, for step P3 described above: in addition to performing the first alternative solution of determining the arrangement position of the replacement model with the center position and orientation, another aspect of the present invention also provides the method of determining the arrangement position within the three-dimensional scene. The relative geometric positional relationship between the three-dimensional models is used to determine the second alternative of the arrangement position of the replacement model. Specifically, the mutual spacing ratio between the replacement models is determined based on the mutual spacing ratio of the original models, for example, the mutual spacing is reduced year-on-year or enlarged year-on-year in the same three-dimensional space to meet the size difference caused by the replacement models. In other words, the second alternative is to determine the arrangement position based on the relative spacing rather than the central position, but the orientation vector of the replacement model is consistent with the orientation vector of the corresponding original model.

According to a preferred embodiment of the present invention, in the second situation where some vertices and edges of the original model are located in the replacement space (such as a three-dimensional model segment that runs through or is partially embedded in the replacement space) (that is, the three-dimensional model is When the model is a second original model with some vertices and edges located in the replacement space), the replacement steps include:

P5 selects at least one three-dimensional model segment in the three-dimensional scene where the three-dimensional model penetrates or is partially embedded in the replacement space.

P6 determines the point or line of at least one three-dimensional model section that intersects the replacement space envelope as the vertex and/or the outermost line of the replacement three-dimensional model section.

P7 determines the alternative three-dimensional model segment as the second original model.

P8 selects model files of each replacement model to replace the second original model from the three-dimensional model database.

P9 analysis determines the center position and orientation of each replacement model in the model file and each second original model in the three-dimensional scene.

P10 replaces the second original model in the three-dimensional scene with each replacement model based on the determined center position and orientation.

Specifically, when it is determined in advance that at least one three-dimensional model section that runs through or is partially embedded in the replacement space should be replaced "when the original model within the replacement space is selected", the at least one three-dimensional model section is combined with The point or line where the replacement space envelope intersects is determined as the vertex and/or the outermost line of the replacement three-dimensional model segment, thereby determining the replacement three-dimensional model segment as the second original model. In other words, the second original model is a three-dimensional model section that is to be replaced throughout or partially embedded in the replacement space, but during the replacement is considered to be the original model within the replacement space.

As shown in Figure 2, when there is at least one three-dimensional model section A in the replacement space that runs through or is partially embedded in the replacement space, the point or line of the at least one three-dimensional model section A that intersects the envelope of the replacement space is determined as The vertices and/or outermost lines of the alternative three-dimensional model section are replaced and the alternative three-dimensional model section is determined as the second original model that should be replaced. Select the model file of each replacement model to replace the second original model from the three-dimensional model database, and replace the three-dimensional model section A with the three-dimensional model by analyzing the center position and orientation of each replacement model and each second original model. Section A'. Further, the three-dimensional model section B and the three-dimensional model section C that are originally integrated with the three-dimensional model section A and are outside the replacement space are adaptively combined with the replaced three-dimensional model section A' to form an integrated model.

As a non-limiting example, the so-called adaptive combination is, for example: when the three-dimensional model section A is a partial section of a certain pipe that crosses the replacement space, and the replaced three-dimensional model section A' is a pipe diameter compared to When shrinking another pipeline, the 3D model section B and the 3D model section C that are originally integrated with the 3D model section A and are outside the replacement space are scaled proportionally, and are placed in the same position as the replaced 3D model section A'. Join at a point or line that intersects the replacement space envelope. Or, when the three-dimensional model section A is a straight pipe crossing the replacement space, and the replaced three-dimensional model section A' is a serpentine pipe with basically the same diameter, the original and three-dimensional pipes outside the replacement space will be The three-dimensional model sections B and C integrated with the model section A are joined to the replaced three-dimensional model section A' at a point or line that intersects the replacement space envelope. In addition, in other optional embodiments, the three-dimensional model section B and the three-dimensional model section C that are originally integrated with the three-dimensional model section A and are outside the replacement space can be adapted to the replaced three-dimensional model section A'. Substitution is performed synchronously, and the user decides the subsequent operations, such as rejecting the substitution, agreeing to the substitution, or modifying the substitution, etc. In particular, when replacing "at least one three-dimensional model segment that runs through or is partially embedded in the replacement space", the first replacement solution based on the center position and orientation of the model can be used, or the relative geometric position relationship between the models can be used based on the second alternative.

According to a preferred embodiment, in the replacement space, in addition to the first original model and the second original model to be replaced, there is also a third "three-dimensional model section that runs through or is partially embedded in the replacement space and should be retained." In this case, the replacement steps include:

Before step P3 in the first situation, when analyzing and determining the center position and orientation of each replacement model in the corresponding model file and each original model in the three-dimensional scene, it is determined that at least one vertex or edge is located outside the three-dimensional scene. When creating a model, the three-dimensional model is determined as a fixed three-dimensional model that is not an original model. In step P4 of the first situation, the center position and orientation of the fixed three-dimensional model are not determined by analysis, or the results of the analysis and determination are not retained, and the fixed three-dimensional model does not correspond to it and is used to replace it. replacement model.

Furthermore, based on the above-mentioned third situation of "three-dimensional model sections that penetrate or are partially embedded in the replacement space and should be retained", there may also be a fourth situation as described below:

When the fixed three-dimensional model and the original model have fixed spacing requirements due to regulations or objective conditions, when calculating the relative spacing in the second alternative, the first original model and the second original model and/or the fixed three-dimensional On the premise of the absolute spacing of the models, the mutual spacing of the replacement models is calculated according to the mutual spacing proportional relationship of the first original model.

Preferably, according to the present invention, the distance between one first original model and another first original model can also be preset as an absolute distance that needs to be retained. When performing a replacement for the original model, the absolute distance is The calculations in the second alternative will be preserved.

In particular, the first replacement scheme and the second replacement scheme can be used jointly, that is, the three-dimensional space is divided into at least one first area for replacement with the central position as the key element, and at least one second area for replacement with the mutual spacing as the key element. area, at least one third area that considers both mutual spacing and absolute spacing as key elements for replacement, and at least one fourth area that considers center position, mutual spacing, and absolute spacing as key elements for replacement.

Figure 3 shows an operation flow of the method for realizing regional three-dimensional model replacement according to the present invention. The operation flow may specifically include the following steps:

S1 3D model data preparation.

S2 draws a planar area and forms a replacement space containing one or more three-dimensional models to be replaced.

S3 obtains the local replacement model in response to the user's replacement request.

Secondary filtering and replacement of models in the S4 preview window.

S5 uses the replacement model to replace one or more three-dimensional models to be replaced in the replacement space.

S6 adjusts the replacement position of the replaced replacement model.

According to a preferred embodiment, when or after step S2 is executed, step S7 is also included: obtaining the first center position of the model bounding box (or unit replacement space) of one or more three-dimensional models to be replaced in the replacement space.

According to a preferred embodiment, when or after step S4 is executed, step S8 is also included: obtaining the second center position of the model bounding box (or unit replacement space) of one or more replacement models for performing replacement. Further, step S9 is performed: comparing the first center position of the model bounding box (or unit replacement space) of one or more three-dimensional models to be replaced with the corresponding model bounding box (or model bounding box) of one or more replacement models to be replaced. The unit replacement space) is aligned with the second center position, so that the substitution operation of the replacement model for the original model is performed based on the alignment result of the pairwise center positions.

Those skilled in the art will understand that as long as the purpose of the present invention can be achieved, other steps or operations may be included before or after each of the above steps or between the steps, such as further optimizing and/or improving the method of the present invention. In addition, although the method of the present invention is shown and described as a series of actions performed in sequence, it should be understood that the method is not limited to the sequence. For example, some actions may occur in a different order than described herein. Or, one action can occur simultaneously with another action.

Example 2

This embodiment provides a system for realizing regional 3D model replacement, which may include:

Building module, used to construct a replacement space that partially or fully contains several three-dimensional models in a three-dimensional scene;

The determination module is used to filter several three-dimensional models in the replacement space to determine the original model to be replaced;

An execution module is configured to obtain replacement models in response to replacement requirements to replace each original model with a replacement model.

According to a preferred embodiment, in the present invention, the building blocks may further include:

Selecting a unit is used for the user to construct at least one plane area located on at least one projection plane shared by several three-dimensional models to be replaced in the three-dimensional scene;

A calculation unit used to determine the expansion height of the plane area based on the maximum envelope height of the projection surface along the normal direction;

The forming unit is used to form the replacement space based on the expansion height determined by the calculation unit.

According to a preferred implementation, in the present invention, the determining module may further include:

The first screening unit is used to determine the three-dimensional model in which all vertices and lines end in the replacement space as the first original model to be replaced;

The second screening unit is used to determine the three-dimensional model whose vertices and lines terminate in the replacement space as the second original model to be replaced.

According to a preferred implementation, in the present invention, the execution module may further include:

The acquisition unit is used to obtain the replacement model for replacement in response to the replacement requirement input by the user;

Replacement unit used to replace each original model with a replacement model.

The beneficial effects of the system for realizing regional three-dimensional model replacement provided by this embodiment are the same as the beneficial effects of the method for realizing regional three-dimensional model replacement provided by the above-mentioned embodiments, and other technical features of the system for realizing regional three-dimensional model replacement are the same as those of the above-mentioned implementation. The features disclosed in the examples are the same and will not be described in detail here to avoid redundancy.

It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the scope of the present invention. within the scope of protection of the invention. Those skilled in the art should understand that the description of the present invention and the accompanying drawings are illustrative and do not constitute limitations on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The description of the present invention contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally" all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept. s right.

Claims (10)

1. A method for implementing regional three-dimensional model replacement, comprising:

constructing a replacement space which partially or completely contains a plurality of three-dimensional models in the three-dimensional scene;

screening and filtering a plurality of three-dimensional models in the replacement space to determine an original model to be replaced;

a replacement model is obtained in response to replacement requirements to replace each of the original models with the replacement model.

2. The method for implementing regional three-dimensional model replacement according to claim 1, wherein constructing a replacement space that partially or entirely contains several three-dimensional models in a three-dimensional scene comprises:

constructing at least one plane area in a three-dimensional scene, wherein the plane area is positioned on at least one projection plane shared by a plurality of three-dimensional models to be replaced;

determining the expansion height of the plane area according to the maximum envelope height of the projection surface along the normal direction;

and forming the replacement space based on the extended height.

3. The method of implementing regional three-dimensional model replacement of claim 1, wherein the filtering the number of three-dimensional models in the replacement space to determine the original model to be replaced comprises:

Determining a three-dimensional model with all vertexes and lines ending in the replacement space as a first original model to be replaced;

and determining the three-dimensional model with partial vertexes and lines ending in the replacement space as a second original model to be replaced.

4. A method of implementing regional three-dimensional model replacement as claimed in claim 3, wherein in the case where the three-dimensional model is the first original model in which both vertices and edges lie in the replacement space, the replacing step includes:

selecting all first original models in the replacement space in a three-dimensional scene;

selecting model files of each replacement model to replace the first original model from a three-dimensional model database;

analyzing and determining the central position and orientation of each replacement model in the model file and each first original model in the three-dimensional scene;

all of the first original models in the three-dimensional scene are replaced with respective replacement models based on the determined center position and orientation.

5. A method of implementing a regional three-dimensional model replacement as claimed in claim 3, wherein in the case where the three-dimensional model is a second original model with part of its vertices and edges located in the replacement space, the replacing step comprises:

Selecting at least one three-dimensional model section of the three-dimensional model penetrating or partially embedding the replacement space in a three-dimensional scene;

determining a point or line of the at least one three-dimensional model segment intersecting the alternative spatial envelope as a vertex and/or an outermost line of an alternative three-dimensional model segment;

determining the alternative three-dimensional model section as a second original model;

selecting model files of each replacement model to replace the second original model from a three-dimensional model database;

analyzing and determining the central position and orientation of each replacement model in the model file and each second original model in the three-dimensional scene;

the second original model in the three-dimensional scene is replaced with each replacement model based on the determined center position and orientation.

6. The method of implementing regional three-dimensional model replacement of claim 4 or 5, wherein analytically determining the center position and orientation of each replacement model within the model file and each first or second original model in a three-dimensional scene further comprises:

the center position and the orientation of each unit substitution space of each substitution model and each first original model or each second original model in the three-dimensional scene are determined through analysis.

7. The method of implementing regional three-dimensional model replacement of claim 1, wherein the obtaining a replacement model to replace each of the original models with the replacement model in response to a replacement demand further comprises:

determining the arrangement position of the corresponding replacement model in the replacement space by the relative geometrical positions of all original models with respect to each other;

the original model in the three-dimensional scene is replaced with each replacement model based on the determined placement position.

8. The method for implementing regional three-dimensional model replacement of claim 4 or 5, further comprising:

a replacement list for replacement is provided in connection with the model files of the selected respective replacement models to allow a user to determine correspondence between the replacement model and the original model based on the replacement list and to perform manual replacement of the replacement model.

9. The method for implementing the replacement of the three-dimensional model of the area according to claim 2, wherein the maximum envelope height is greater than or equal to the position of the vertex or line with the largest normal height in the three-dimensional models to be replaced.

10. A system for implementing regional three-dimensional model replacement, comprising:

A construction module for constructing a replacement space containing a plurality of three-dimensional models in part or in whole in the three-dimensional scene;

the determining module is used for screening and filtering a plurality of three-dimensional models in the replacement space to determine an original model to be replaced;

and the execution module is used for responding to the replacement requirement to acquire a replacement model so as to replace each original model with the replacement model.