CN117313221B - Building target modeling method for target vulnerability - Google Patents

Abstract

The invention relates to a building target modeling method for target vulnerability, which belongs to the technical field of target vulnerability analysis and solves the problems of low modeling efficiency, poor scalability and editing problems of existing modeling methods in target vulnerability analysis. The problem of inflexible adjustment. It includes establishing models of different target components according to the component types of the building target to be modeled, configuring the target editable parameters of the building target, obtaining the bounding box parameters of each target component, and then generating a target component parameter set and a target component constraint set, and then The constraints of each target component of the building target are solved to obtain the updated bounding box parameters of each target component. By moving each target component, the construction of the parametric modeling model is completed; the target of the parametric modeling model can be modified according to the actual modeling requirements. Edit the parameters and constraints in the target component constraint set to generate an equivalent 3D digital model of the architectural target. Enables flexible modeling of building targets in target vulnerability analysis.

Description

A construction target modeling approach for target vulnerability

Technical field

The present invention relates to the technical field of target vulnerability analysis, and in particular to a building target modeling method for target vulnerability.

Background technique

Target vulnerability refers to how easy it is for a target to be damaged when struck by damage elements. Research on target vulnerability can guide optimal target design and target attack plan planning. The target vulnerability model includes an equivalent three-dimensional digital model, an equivalent material model, a damage logical relationship model and a damage law model. Among them, the spatial physical structure of the target is simplified and the key features are retained to obtain an equivalent three-dimensional digital model; the equivalent three-dimensional digital model is assigned material properties to obtain an equivalent material model, and the target damage logical relationship model is obtained by analyzing the physical functional structure of the target. , through the experimental analysis of target damage, the damage law model of specific damage elements to the target is obtained.

In modern warfare, various ground building targets play an important role in command, defense and information centers. At the same time, with the transformation of modern warfare models, there are more and more tactical means to preempt the enemy. The corresponding number and style of ground buildings used for defense are also increasing, making ground building targets an increasingly important military target. At present, the damage effect assessment of building targets has become a hot research topic. The damage effect assessment process requires high-quality target equivalent three-dimensional digital models. Traditional military building target modeling is still based on interactive manual modeling. For situations with complex structures, a large number of components, the need for repeated modifications and adjustments, and diverse types, interactive manual modeling has low modeling efficiency and poor modeling quality. The disadvantages of unevenness are becoming more and more obvious. Moreover, due to the diverse and complex structures of architectural targets, manual interactive modeling is inefficient; a building target contains hundreds of components, and it takes a long time to assemble the components into a target; considerations need to be taken into account when secondary editing of building targets The spatial positional relationship of components is difficult to edit quickly, which makes the construction of equivalent three-dimensional digital models in existing building target vulnerability models time-consuming. The most commonly used solution at present is the secondary development of existing modeling systems, such as secondary development of general modeling systems such as CATIA, SolidWorks, and Revit. However, secondary development requires modelers to have a rich computer programming foundation. At the same time, the development workload of secondary development itself is also huge. This method is only suitable for specific types of architectural goals.

Therefore, there is an urgent need for a modeling method with high modeling efficiency, strong scalability and flexible editing and adjustment in target vulnerability analysis.

Contents of the invention

In view of the above analysis, embodiments of the present invention aim to provide a building target modeling method for target vulnerability to solve the problem of low modeling efficiency, poor scalability and poor scalability of existing modeling methods in target vulnerability analysis. The issue of inflexible editing adjustments.

The embodiment of the present invention provides a building target modeling method for target vulnerability, including the following steps:

Establish models of different target components according to the component types of the building target to be modeled, and configure the target editable parameters of the building target; based on each target component model and target editable parameters in the building target to be modeled, obtain the bounding box of each target component parameters, and then generate the target component parameter set and target component constraint set;

According to the target component parameter set and the target component constraint set, the constraints of each target component of the building target are solved to obtain the updated bounding box parameters of each target component, and then each target component is moved to complete the construction of the parametric modeling model;

Modify the target editable parameters of the parametric modeling model and the constraint conditions in the target component constraint set according to actual modeling requirements to generate an equivalent three-dimensional digital model of the architectural target.

Furthermore, the model of the target component is established in the following ways:

Establish the target coordinate system and select the fixed size parameters of the target component; among them, the fixed size parameters are parameters that determine the spatial structure size of the target component;

Taking the origin of the target coordinate system as the geometric center point of the target component, obtain the coordinates of each vertex of the target component, and then obtain the parameters of the target component's bounding box;

Based on the coordinates of each vertex of the target component, the vertex topological relationship of the target component is generated to complete the establishment of the target component model.

Further, the target component parameter set is generated in the following way:

Select the type and quantity of the target component model based on the actual component type and quantity of the building target to be modeled;

Based on the target editable parameters, the fixed size parameter values of each target component model are sequentially set, and then the corresponding bounding box parameter values of each target component are obtained to form a target component parameter set.

Further, the target component constraint in the target component constraint set is the distance constraint between the six faces of the target component bounding box; the constraint format is [first component::surface to be moved, second component::reference surface, set distance] means moving the position of the surface to be moved of the first component to a position that is the set distance from the reference surface of the second component.

Further, the target component constraint set is generated in the following manner:

Select the target datum component according to the architectural target to be modeled, wherein the target datum component is used to undertake the target non-datum component or serve as a positioning reference for the target non-datum component;

Constraints between the target datum component and the target coordinate system, as well as constraints between the target non-datum component and the target datum component, or constraints between non-datum components, are sequentially set to form a target component constraint set.

Further, using the target coordinate system as the reference component, the constraints of each target component of the architectural target are solved in the following way to obtain the updated bounding box parameters of each target component:

Constructing a component surface position mapping structure, which is used to store the corresponding relationship between the component surface and its surface coordinates in the target coordinate system;

Add the component surfaces of all target components and their surface coordinates in the target coordinate system to the component surface position mapping structure according to the target component parameter set as the initial value of the component surface position mapping structure; and add the target editable parameters and the coordinate system surface Add to the component surface position mapping structure;

Build a component constraint mapping structure, which is used to store all constraint relationships between each target component and other target components;

Add constraints of all target components to the component constraint mapping structure based on the target component constraint set; wherein, according to the order of target components in the target component parameter set, each target component only builds a constraint relationship with its previous target component ;

Based on the component constraint mapping structure, the updated bounding box parameters of each target component are obtained.

Further, based on the component constraint mapping structure, the updated bounding box parameters of each target component are obtained in the following manner:

S251. Traverse the constraint relationships of each target component in the component constraint mapping structure in sequence:

S2511. Traverse each constraint relationship of the current target component in sequence: obtain the coordinate value of the second component reference surface in the current target component constraint according to the component surface position mapping structure, and then obtain the updated distance value according to the set distance, and then obtain the movement amount. , and then increase the parameters of the current target component bounding box on the coordinate axis corresponding to the movement direction by the movement amount;

S2512. After traversing all the constraint relationships of the current target component, obtain the updated target component bounding box parameters of the current target component, and use them as corresponding surface positions of the current target component to update the component surface position mapping structure;

S252. After traversing the constraint relationships of all target components, obtain updated bounding box parameters of each target component.

Further, the updated distance value is obtained in the following way:

If the distance set in the target component constraint is a fixed value, add it to the coordinate value of the second component reference surface to obtain the updated distance value;

If the distance set in the target component constraint is an expression generated based on the target editable parameter, the target editable parameter value is obtained based on the component surface position mapping structure, and then added to the coordinate value of the second component reference surface to obtain the update. the distance value after.

Further, the movement amount is obtained by subtracting the coordinate value of the surface on which the first component needs to move from the updated distance value.

Further, move each target component in the following ways:

Based on the updated bounding box parameters of each target component, the center point coordinates of the bounding box of each target component are obtained, and these are used as the updated geometric center positions of the corresponding target components, and the positions of each target component are moved according to them.

Compared with the prior art, the present invention can achieve at least the following beneficial effects:

The present invention provides a construction target modeling method for target vulnerability. By establishing models of different target components and configuring target editable parameters of the construction target, a target component parameter set and a target component constraint set are generated, and then the target component constraint set is generated. The constraints of each target component of the building target are solved to obtain the updated bounding box parameters of each target component. By moving each target component, the construction of the parametric modeling model is completed; in actual application, by modifying the target editable parameters and the target component constraint concentration According to the constraints, an equivalent three-dimensional digital model of the building target can be generated. In the target vulnerability analysis, the modeling efficiency is higher, the scalability is stronger, and the editing adjustment is more flexible. The positioning is greatly simplified through the constraint positioning between components. difficulty and improves the accuracy of component positioning; the system flexibility can be greatly improved by extending custom components; and it provides a method to manage the position of the target component through the component constraint chain. When the target size is re-edited, the system The target component position can be calculated by resolving the constraint chain, which greatly improves the efficiency of target secondary editing.

In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Additional features and advantages of the invention will be set forth in the description which follows, and in part, some advantages will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and obtained by the disclosure particularly pointed out in the description and drawings.

Description of the drawings

The drawings are only for the purpose of illustrating specific embodiments and are not considered to be limitations of the present invention. Throughout the drawings, the same reference symbols represent the same components;

Figure 1 is a schematic flow chart of a building target modeling method for target vulnerability provided by an embodiment of the present invention;

Figure 2 is a schematic diagram of the vertex structure of the space cube component provided by the embodiment of the present invention;

Figure 3 is a schematic diagram of the vertex structure of the space cylinder assembly provided by the embodiment of the present invention;

Figure 4 is a schematic diagram of the triangular structure of the space cube assembly provided by the embodiment of the present invention;

Figure 5 is a schematic diagram of the triangular structure of the space cylinder assembly provided by the embodiment of the present invention;

Figure 6 is a schematic modeling diagram of a typical highway bridge provided by an embodiment of the present invention;

Figure 7 is a schematic modeling diagram of a typical highway bridge after modified parameters according to the 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. The drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

A specific embodiment of the present invention discloses a building target modeling method for target vulnerability, as shown in Figure 1, including the following steps:

S1. Establish models of different target components according to the component types of the building target to be modeled, and configure the target editable parameters of the building target; obtain each target component based on the target component model and target editable parameters in the building target to be modeled. bounding box parameters, and then generate a target component parameter set and a target component constraint set.

It should be noted that building targets are composed of different types and quantities of components. When establishing target component models, different types of target component models can be established.

During implementation, the target component is modeled in the following ways:

S11. Establish the target coordinate system and select the shaped size parameters of the target component; among them, the shaped size parameters are parameters that determine the spatial structure size of the target component.

During the specific implementation, the center point of the modeling display interface is taken as the origin, the X-axis is horizontally to the right along the display interface, the Z-axis is vertically upward along the display interface, and the target coordinate system is established with the Y-axis obtained by the right-hand rule. Among them, the modeling display interface is used to display three-dimensional modeling results, such as a computer monitor interface and a mobile phone display interface.

Specifically, the shaped size parameters of different types of target components are also different, and they are designed according to the specific needs of target component modeling. For example, the fixed dimension parameters of a space cube are the side length of the cube; the fixed dimension parameters of the space cuboid are the length, width, and height of the cuboid; the fixed dimension parameters of the space sphere are the radius of the sphere; and the fixed dimension parameters of the space cylinder are the cylinder radius, height, and resolution. ; Among them, the resolution indicates the number of sides of a circle represented by a regular polygon.

More specifically, the same component can have multiple different sets of dimensional parameters. For example, the dimensional parameters of a space cylinder can also include cylinder diameter, height and resolution, which can be selected based on actual conditions in specific applications.

It should be noted that in this embodiment, for convenience of description, a space cube and a space cylinder are selected for explanation. The fixed size parameters of the space cube are the side length of the cube, and the size parameters of the space cylinder are the cylinder radius, height and resolution.

S12. Taking the origin of the target coordinate system as the geometric center point of the target component, obtain the coordinates of each vertex of the target component, and then obtain the parameters of the target component's bounding box.

Specifically, the vertices of the target component are the intersection points of the faces of the target component. For example, a space cube has 8 vertices, and a cylinder with a resolution of N has 2N+2 vertices.

Specifically, the target component bounding box is the smallest hexahedron that contains an object and each side is parallel to the coordinate axis. The parameters of the target component bounding box are [xmin, xmax, ymin, ymax, zmin, zmax]; where xmin indicates that the target component is in The minimum coordinate value on the X axis, xmax represents the maximum coordinate value of the target component on the X axis, ymin represents the minimum coordinate value of the target component on the Y axis, ymax represents the maximum coordinate value of the target component on the Y axis, and zmin represents the target The minimum coordinate value of the component on the Z axis, zmax represents the maximum coordinate value of the target component on the Z axis. Through the coordinates of each vertex of the target component, statistics can be used to obtain the parameters of the target component's bounding box, or the parameters of the target component's bounding box can be calculated by setting the fixed size parameters.

In this embodiment, for the convenience of description, the side length of the space cube is 1, the radius of the space cylinder is 1, the height is 1 and the resolution is 8. As shown in Figures 2 and 3, the vertex coordinates of the space cube component are obtained as follows As shown in Table 1, the vertex coordinates of the space cylinder component are shown in Table 2.

Table 1 Vertex coordinates of space cube components

Table 2 Vertex coordinates of space cylinder components

Based on the vertex coordinates or set side lengths of the above space cube component, the parameters of the bounding box of the space cube component can be obtained as [-0.5, 0.5, -0.5, 0.5, -0.5, 0.5]; based on the vertices of the above space cylinder component Coordinates or set radius, height and resolution, the parameters of the spatial cylinder component bounding box can be obtained as [-1.0, 1.0, -1.0, 1.0, -0.5, 0.5].

S13. Based on the coordinates of each vertex of the target component, generate the vertex topological relationship of the target component and complete the establishment of the target component model.

Specifically, the topological relationship of the target component's vertices is the order of the constituent vertices of the outer surface patches of the target component. More specifically, in this implementation example, a triangular patch is selected as the target component surface patch. The triangular patch contains three vertex indexes, and these three vertex indexes constitute a triangular patch index group. For example, the (I1, I2, I3) index group contains three indexes I1, I2 and I3, and the corresponding vertex coordinates are P1, P2 and P3. This index group indicates that the three vertices of the triangle patch are P1, P2 and P3, and the outer normal vector of the triangular surface is obtained by the cross product of vector (P1, P2) and vector (P2, P3).

Exemplarily, in this embodiment, the triangular patch of the space cube is shown in Figure 4, and the vertex topological relationship is shown in Table 3; the triangular patch of the space cylinder is shown in Figure 5, and the vertex topological relationship is shown in Table 4. Show.

Table 3 Topological relationship of vertices of space cube

Table 4 Topological relations of space cylinder vertices

Further, the process of steps S11 to S13 is encapsulated into a calculation script using any scripting language, such as python and lua. Among them, the input parameters of the calculation script are the fixed size parameters of the selected target component, and the output parameters are the target component vertex coordinates, the target component bounding box parameters, and the target component vertex topological relationship. More specifically, different target component types have different calculation scripts, and a suitable script needs to be written for each target component type.

During implementation, in step S1, the target editable parameters are parameters that can be modified during the building target modeling process, and are set by the actual building target to be modeled, such as a section of highway bridge. If the height and width of the bridge will not change, Only the length dimension will change, so set the length dimension as the target editable parameter.

For example, in this embodiment, a typical highway bridge is selected as an example for explanation: a typical highway bridge consists of a bridge deck and two piers; wherein, the bridge deck component is equivalent to a space cuboid component, and the pier component is equivalent to a space cuboid component. Cylinder components are equivalent. The fixed size parameter of the space cuboid component is the length of the cuboid component in the directions of the X, Y, and Z coordinate axes.

In this embodiment, the editable parameters for setting a typical highway bridge target are the overall length GL, the overall width GW, the pier height GH and the pier radius GR; where the initial values of each parameter are GL=20000mm, GW=5000mm, GH=6000mm and GR=800mm.

During implementation, in step S1, the target component parameter set is generated in the following way:

Select the type and quantity of the target component model based on the actual component type and quantity of the building target to be modeled;

Based on the target editable parameters, the fixed size parameter values of each target component model are sequentially set, and then the corresponding bounding box parameter values of each target component are obtained to form a target component parameter set.

Illustratively, the component types of a typical highway bridge in this embodiment include space cuboid components and space cylindrical components, where there is 1 space cuboid component and 2 space cylinder components; in this embodiment, for the convenience of description, the space components are The cuboid component is named Cube1, and the two space cylinder components are named Cylinder1 and Cylinder2 respectively.

Based on the set target editable parameters of a typical highway bridge, set the parameter radius R=GR, height H=GH, and resolution N=100 of Cylinder1 in sequence; the parameter radius R=GR, height H=GH of Cylinder2, Resolution N=100; the parameters of Cube1 are the length on the X-axis LengthX=GL, the length on the Y-axis LengthY=GW, and the length on the Z-axis LengthZ=600mm.

Based on step S12, it can be calculated: Cube1 bounding box parameters [-GL/2, GL/2, -GW/2, GW/2, -600/2, 600/2]=[-10000, 10000, -2500, 2500 , -300, 300]; Cylinder1 bounding box parameters [-GR, GR, -GR, GR, -GH/2, GH/2]=[-800, 800, -800, 800, -3000, 3000]; Cylinder2 Bounding box parameters [-GR, GR, -GR, GR, -GH/2, GH/2]=[-800, 800, -800, 800, -3000, 3000].

The target component parameter set is composed of the target component fixed size parameter values and the corresponding bounding box parameter values set in sequence.

During implementation, in step S1, the target component constraint in the target component constraint set is the distance constraint between the six faces of the target component bounding box; the constraint format is [first component::surface to be moved, second component::reference Surface, set distance] means moving the position of the surface to be moved of the first component to a position that is the set distance from the reference surface of the second component. Among them, the distance set in the constraint format represents the distance that the surface to be moved needs to move in the normal direction of the reference surface. The movement of the surface to be moved is achieved by changing the position of the component where the surface to be moved is located. It should be noted that in this embodiment, the face of the component refers to the face corresponding to the component's bounding box.

Specifically, the moving surface and reference surface of the component are set according to the actual situation. For example, in bridge construction, the piers are usually built first and then the bridge deck is placed on the piers. Then the surface that needs to be moved belongs to the bridge deck component, and the bridge deck is specifically selected. Which side of the component should be moved needs to be determined based on the actual situation. If the bridge deck is placed on the pier, then the bottom surface of the bridge deck component is selected as the surface that needs to be moved, and the top surface of the pier component is selected as the reference surface.

Specifically, the six faces of the target component bounding box are defined as Front, Back, Left, Right, Top and Bottom respectively. Among them, Front is a plane parallel to the OZX plane of the coordinate system and its plane normal points to the negative direction of the Y-axis, Back is a plane parallel to the OZX plane of the coordinate system and its plane normal points to the positive direction of the Y-axis, and Left is parallel The plane on the right is parallel to the OYZ plane of the coordinate system and its plane normal points to the negative direction of the X-axis. The top Top is a plane parallel to the OXY plane of the coordinate system and Its plane normal points to the positive direction of the Z-axis. The bottom below is a plane parallel to the OXY plane of the coordinate system and its plane normal points to the negative direction of the Z-axis.

Preferably, if the constraint is a constraint on a coordinate system surface, the coordinate system surface does not need to be qualified by adding a component name. In this embodiment, for the convenience of description, the three planes OXY, OYZ, and OZX in the target coordinate system are defined as XY, YZ, and ZX respectively.

It should be noted that in the constraint format, the moving surface needs to be parallel to the reference surface, that is, the Front surface and Back surface of a component can only be constrained with the Front surface and Back surface of other components, and the Left surface and Right surface can only be constrained with the Left surface of other components. Surface and Right surface constraints, Top surface and Bottom surface can only be constrained with the Top surface and Bottom surface of other components; and the target coordinate system surface can only be used as a reference surface, and the components to which the moving surface and the reference surface belong cannot be the same component. The distance expression is a legal mathematical operation expression and its calculation result can be any real number.

During specific implementation, the target component constraint set is generated in the following manner:

Select the target datum component according to the architectural target to be modeled, wherein the target datum component is used to undertake the target non-datum component or serve as a positioning reference for the target non-datum component;

Constraints between the target datum component and the target coordinate system, as well as constraints between the target non-datum component and the target datum component, or constraints between non-datum components, are sequentially set to form a target component constraint set.

It should be noted that the non-benchmark component of the target can establish constraints with the baseline component or other non-benchmark components, and you can choose freely according to the actual situation.

Specifically, the datum component is selected based on the actual situation of the target. If the building target is an office building, the datum component is selected as the foundation. Preferably, if there is no obvious datum component, the target coordinate system is selected as the datum component; if the target coordinate system is selected as the datum component, there is no need to set constraints between the target datum component and the target coordinate system.

For example, the component constraints of a typical highway bridge in this embodiment are set as follows: The distance between the Bottom of Cylinder1 and the XY plane is 0.0, that is, [Cylinder1::Bottom, XY, 0.0]; the distance between the Left of Cylinder1 and the YZ plane The distance is -0.45×GL, that is, [Cylinder1::Left, YZ, -0.45×GL]; the distance between the Bottom of Cylinder2 and the XY plane is 0.0, that is, [Cylinder2::Bottom, XY, 0.0]; the Right and YZ of Cylinder2 are The distance between the planes is 0.45×GL, that is, [Cylinder2::Right, YZ, 0.45×GL]; the distance between the Bottom below Cube1 and the Top above Cylinder2 is 0.0, that is, [Cube1::Bottom, Cylinder2::Top, 0.0].

S2. According to the target component parameter set and the target component constraint set, solve the constraints of each target component of the building target to obtain the updated bounding box parameters of each target component, and then move each target component to complete the construction of the parametric modeling model.

During implementation, in step S2, using the target coordinate system as the reference component, the constraints of each target component of the building target are solved in the following way to obtain the updated bounding box parameters of each target component:

S21. Construct a component surface position mapping structure. The component surface position mapping structure is used to store the corresponding relationship between the component surface and its surface coordinates in the target coordinate system. Among them, each component face of the target component is the six faces of the target component bounding box corresponding to the target component.

Specifically, the surface coordinates of the component surface in the target coordinate system are the coordinate values of any point on the component surface on the coordinate axis parallel to the normal direction of the surface. For example, for the front face coordinates of the component, the coordinate axis parallel to the normal direction of the front face of the component is the Y axis. The coordinate value of any point on the Y axis is the coordinate value of the component face in the target coordinate system. face coordinates.

S22. Add the component surfaces of all target components and their surface coordinates in the target coordinate system to the component surface position mapping structure according to the target component parameter set as the initial value of the component surface position mapping structure; and add the target editable parameters and coordinates The system face is added to the component face position mapping structure. It can be understood that the component face of the target component, that is, the corresponding face of the bounding box, can determine its corresponding face coordinates according to the parameters of the target component bounding box, such as Cylinder1 bounding box parameters [-800, 800, -800, 800, -3000, 3000], then the front face coordinate of the Cylinder1 component is -800, the back face coordinate is 800, the left face coordinate is -800, the right face coordinate is 800, the upper face coordinate is 3000, and the lower face coordinate is 3000. The face coordinate is -3000.

It should be noted that the target editable parameters and the coordinate system surface are not the corresponding relationship between the component surface and its coordinates in the target coordinate system. Only the corresponding relationship between the component surface and the numerical value is stored.

Exemplarily, in this embodiment, the map structure in the computer data structure is used as the component surface position mapping structure. For example, the Cylinder1 component is stored in the component surface position mapping structure as: Cylinder1::Front, -800; Cylinder1::Back, 800 ; Cylinder1::Left, -800; Cylinder1::Right, 800; Cylinder1::Top, 3000; Cylinder1::Bottom, -3000. The target editable parameters and coordinate system surfaces are stored as: GL, 20000; GW, 5000; GH, 6000; GR, 800; XY, 0; YZ, 0; ZX, 0.

S23. Construct a component constraint mapping structure, which is used to store all constraint relationships between each target component and other target components. Specifically, the constraint relationship of the building target components is the surface constraint relationship between the target components. It can be understood that all constraint relationships of a specific component can be found through the component constraint mapping structure.

For example, in this embodiment, the map structure in computer data structure is used as the component constraint mapping structure.

S24. Add constraints of all target components to the component constraint mapping structure based on the target component constraint set; wherein, according to the order of target components in the target component parameter set, each target component is only constructed with its previous target component. constraint relationship. It should be noted that the first target component in the target component parameter set establishes a constraint relationship with the target coordinate system.

It can be understood that due to the large number of target components and the complex constraint relationships, the constraint relationships of the target components will form a constraint chain. For example, the position of component A depends on the position of component B, and the position of component B depends on the position of component C; for To avoid circular references, it is stipulated that according to the setting order in the target component parameter set, the component defined later can only build a constraint relationship with the component defined before it.

For example, in this embodiment, the constraints of each target component in a typical highway bridge are expressed as: The constraint relationship of component Cylinder1 is [Cylinder1::Bottom, XY, 0.0], [Cylinder1::Left, YZ, -0.45× GL]; the constraint relationship of component Cylinder2 is [Cylinder2::Bottom, XY, 0.0], [Cylinder2::Right, YZ, 0.45×GL]; the constraint relationship of component Cube1 is [Cube1::Bottom, Cylinder2::Top, 0.0].

S25. Based on the component constraint mapping structure, obtain updated bounding box parameters of each target component.

Specifically, in step S25, the updated bounding box parameters of each target component are obtained in the following manner:

S251. Traverse the constraint relationships of each target component in the component constraint mapping structure in sequence:

S2511. Traverse each constraint relationship of the current target component in sequence: obtain the coordinate value of the second component reference surface in the current target component constraint according to the component surface position mapping structure, and then obtain the updated distance value according to the set distance, and then obtain the movement amount. , and then increase the parameters of the current target component bounding box on the coordinate axis corresponding to the movement direction by the movement amount;

S2512. After traversing all the constraint relationships of the current target component, obtain the updated target component bounding box parameters of the current target component, and use them as corresponding surface positions of the current target component to update the component surface position mapping structure;

S252. After traversing the constraint relationships of all target components, obtain updated bounding box parameters of each target component.

More specifically, the updated distance value is obtained in the following way:

If the distance set in the target component constraint is a fixed value, add it to the coordinate value of the second component reference surface to obtain the updated distance value;

If the distance set in the target component constraint is an expression generated based on the target editable parameter, the target editable parameter value is obtained based on the component surface position mapping structure, and then added to the coordinate value of the second component reference surface to obtain the update. the distance value after.

More specifically, the movement amount is obtained by subtracting the coordinate value of the surface of the first component that needs to be moved from the updated distance value, where the coordinate value of the surface that needs to be moved of the first component can be obtained through the component surface position mapping structure.

Illustratively, in this embodiment, for the convenience of description, abbreviations are added to each part of the constraints, and the abbreviations are defined as: component name::surface to be moved, referred to as Src; component name::reference surface, referred to as Dist; distance, referred to as Distance; The part face position mapping structure is referred to as PartFace.

First calculate the constraint relationship of component Cylinder1.

After the constraint [Cylinder1::Bottom, XY, 0.0] is separated, Src is Cylinder1::Bottom, Dist is XY, and Distance is 0.0; take the corresponding value of XY from PartFace to 0; update Distance=0+0=0; calculate movement The amount dZ=0-(-3000)=3000; after increasing the values of parameters zmin and zmax in the bounding box of the Cylinder1 component by dZ, their values are 0 and 6000 respectively.

After the constraints [Cylinder1::Left, YZ, -0.45×GL] are separated, Src is Cylinder1::Left, Dist is YZ, and Distance is -0.45×GL; the value corresponding to YZ is taken from PartFace to be 0; Distance is the calculation expression -0.45×GL, take the corresponding value of GL from PartFace as 20000, and calculate the result of -0.45×GL as -9000; update Distance=-9000+0=0; calculate the movement increase dX=-9000-(-800)= -8200. After increasing the values of the parameters xmin and xmax in the bounding box of the Cylinder1 component by dX, their values are -9000 and -7400 respectively.

After the Cylinder1 constraint is solved, its bounding box parameters are [-9000, -7400, -800, 800, 0, 6000].

Calculate the constraint relationships of components Cylinder2 and Cube1 according to the above steps. The updated component bounding box parameters are [7400, 9000, -800, 800, 0,6000], [-10000, 10000, -2500, 2500, 6000, 6600]. ].

During implementation, move each target component in the following ways:

Based on the updated bounding box parameters of each target component, the center point coordinates of the bounding box of each target component are obtained, and these are used as the updated geometric center positions of the corresponding target components, and the positions of each target component are moved according to them.

Specifically, the bounding box center point coordinates (Cx, Cy, Cz) are calculated based on the updated bounding box parameters of each target component, where Cx=(xmin+xmax)/2, Cy=(ymin+ymax)/2, Cz= (zmin+zmax)/2.

For example, in this embodiment, the center point coordinates of the bounding boxes of the three target components in a typical highway bridge are: Cylinder1 center point coordinates (-8200, 0, 3000), Cylinder2 center point coordinates (8200, 0, 3000) , Cube1 center point coordinates (0, 0, 6300).

Further, based on the updated geometric center position of each target component, according to step S12, the vertex coordinates and vertex topological relationships of all components of the building target are generated, and the stl file is written according to the stl data format to complete the export of the target equivalent three-dimensional digital model, that is Complete the construction of the parametric modeling model.

For example, Figure 6 shows the equivalent three-dimensional digital model of a typical highway bridge in this embodiment, and the model construction result is shown in Figure 7 by modifying the target editable parameters GH to 4000 and GR to 1000.

S3. Modify the target editable parameters of the parametric modeling model and the constraint conditions in the target component constraint set according to the actual modeling requirements, and generate an equivalent three-dimensional digital model of the architectural target.

Compared with the existing technology, the present invention provides a construction target modeling method for target vulnerability. By establishing models of different target components and configuring target editable parameters of the construction target, the target component parameter set and The target component constraint set is then solved to solve the constraints of each target component of the building target to obtain the updated bounding box parameters of each target component. By moving each target component, the construction of the parametric modeling model is completed; in practical applications, the target can be modified by modifying the target component. By editing the constraints in the set of parameters and target component constraints, an equivalent three-dimensional digital model of the building target can be generated. In the target vulnerability analysis, the modeling efficiency is higher, the scalability is stronger, and the editing adjustment is more flexible; through the interface between components Constraint positioning greatly simplifies the positioning difficulty and improves the accuracy of component positioning; it can greatly improve system flexibility by extending custom components; and provides a method to manage the position of the target component through the component constraint chain. When targeting the target When the size is re-edited, the system can re-solve the constraint chain to complete the calculation of the target component position, which greatly improves the efficiency of the target re-edit.

Those skilled in the art can understand that all or part of the process of implementing the method of the above embodiments can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. Wherein, the computer-readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention. All substitutions are within the scope of the present invention.

Claims (8)

1. A construction target modeling method for target vulnerability, characterized in that it includes the following steps: Establish models of different target components according to the component types of the building target to be modeled, and configure the target editable parameters of the building target; based on each target component model and target editable parameters in the building target to be modeled, obtain the bounding box of each target component parameters, and then generate the target component parameter set and target component constraint set; According to the target component parameter set and the target component constraint set, the constraints of each target component of the building target are solved to obtain the updated bounding box parameters of each target component, and then each target component is moved to complete the construction of the parametric modeling model; Modify the target editable parameters of the parametric modeling model and the constraint conditions in the target component constraint set according to actual modeling needs to generate an equivalent three-dimensional digital model of the architectural target; Among them, using the target coordinate system as the reference component, the constraints of each target component of the building target are solved in the following way to obtain the updated bounding box parameters of each target component: Constructing a component surface position mapping structure, which is used to store the corresponding relationship between the component surface and its surface coordinates in the target coordinate system; Add the component surfaces of all target components and their surface coordinates in the target coordinate system to the component surface position mapping structure according to the target component parameter set as the initial value of the component surface position mapping structure; and add the target editable parameters and the coordinate system surface Add to the component surface position mapping structure; Build a component constraint mapping structure, which is used to store all constraint relationships between each target component and other target components; Add constraints of all target components to the component constraint mapping structure based on the target component constraint set; wherein, according to the order of target components in the target component parameter set, each target component only builds a constraint relationship with its previous target component ; Based on the component constraint mapping structure, the updated bounding box parameters of each target component are obtained; where, Based on the component constraint mapping structure, the updated bounding box parameters of each target component are obtained in the following way: S251. Traverse the constraint relationships of each target component in the component constraint mapping structure in sequence: S2511. Traverse each constraint relationship of the current target component in sequence: obtain the coordinate value of the second component reference surface in the current target component constraint according to the component surface position mapping structure, and then obtain the updated distance value according to the set distance, and then obtain the movement amount. , and then increase the parameters of the current target component bounding box on the coordinate axis corresponding to the movement direction by the movement amount; S2512. After traversing all the constraint relationships of the current target component, obtain the updated target component bounding box parameters of the current target component, and use them as corresponding surface positions of the current target component to update the component surface position mapping structure; S252. After traversing the constraint relationships of all target components, obtain updated bounding box parameters of each target component. 2. The construction target modeling method for target vulnerability according to claim 1, characterized in that the model of the target component is established by: Establish the target coordinate system and select the fixed size parameters of the target component; among them, the fixed size parameters are parameters that determine the spatial structure size of the target component; Taking the origin of the target coordinate system as the geometric center point of the target component, obtain the coordinates of each vertex of the target component, and then obtain the parameters of the target component's bounding box; Based on the coordinates of each vertex of the target component, the vertex topological relationship of the target component is generated to complete the establishment of the target component model. 3. The construction target modeling method for target vulnerability according to claim 2, characterized in that the target component parameter set is generated by: Select the type and quantity of the target component model based on the actual component type and quantity of the building target to be modeled; Based on the target editable parameters, the fixed size parameter values of each target component model are sequentially set, and then the corresponding bounding box parameter values of each target component are obtained to form a target component parameter set. 4. The construction target modeling method for target vulnerability according to claim 3, characterized in that the target component constraints in the target component constraint set are distance constraints between the six faces of the target component bounding box; The constraint format is [first component::surface to be moved, second component::reference surface, set distance], which means that the position of the surface to be moved of the first component is moved to a distance from the reference surface of the second component of the set distance. position at a certain distance. 5. The construction target modeling method for target vulnerability according to claim 4, characterized in that the target component constraint set is generated by: Select the target datum component according to the architectural target to be modeled, wherein the target datum component is used to undertake the target non-datum component or serve as a positioning reference for the target non-datum component; Constraints between the target datum component and the target coordinate system, as well as constraints between the target non-datum component and the target datum component, or constraints between non-datum components, are sequentially set to form a target component constraint set. 6. The construction target modeling method for target vulnerability according to claim 1, characterized in that the updated distance value is obtained in the following manner: If the distance set in the target component constraint is a fixed value, add it to the coordinate value of the second component reference surface to obtain the updated distance value; If the distance set in the target component constraint is an expression generated based on the target editable parameter, the target editable parameter value is obtained based on the component surface position mapping structure, and then added to the coordinate value of the second component reference surface to obtain the update. the distance value after. 7. The construction target modeling method for target vulnerability according to claim 6, characterized in that the movement amount is obtained by subtracting the coordinate value of the surface where the first component needs to move from the updated distance value. 8. The construction target modeling method for target vulnerability according to claim 7, characterized in that each target component is moved by: Based on the updated bounding box parameters of each target component, the center point coordinates of the bounding box of each target component are obtained, and these are used as the updated geometric center positions of the corresponding target components, and the positions of each target component are moved according to them.