JP2007102320A - Three-dimensional shape object disassembling line display method, device, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a program for preparing a disassembling line which is vertical to the axis of "axis and axis" and a method, a device and a program for drawing a figure by executing the program. <P>SOLUTION: This three-dimensional shape object disassembling line display method is provided to display a three-dimensional shape object disassembling line by dividing a three-dimensional shape into a plurality of three-dimensional shape elements, and disassembling the three-dimensional shape elements by separating them from each other according to a geometrical relation set among the three-dimensional shape elements, and forming a disassembling line connecting the three-dimensional shape elements having the displayed geometrical relation, wherein the geometrical relation of the three-dimensional shape elements is that those mutual axes are in parallel with each other, and the disassembling line is a segment connecting the both ends of each of the disassembling lines of the two axes having the parallel geometrical relation with one end as a start point and the other end as an end point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method, an apparatus, and a program for displaying a line by decomposing a three-dimensional shape.

With the spread of 3D CAD / CG systems, etc., the user group of 3D shape data is expanded, and in order to verify the assemblability of actual products and to create work procedure manuals such as disassembly / assembly, 3 Opportunities for effective use of dimensional shape data are increasing.
In order to create the work procedure manual as described above, a figure (or assembly drawing) showing a state in which the shapes of the parts constituting the product are arranged separately is indispensable.
Conventionally, the creation of such a figure has been performed manually by an expert based on a two-dimensional drawing of the product shape, and thus requires a great deal of cost.
For example, in Patent Document 1, by effectively utilizing the three-dimensional shape data of the product shape, and automatically decomposing and displaying the product shape according to the geometrical relationship existing in the three-dimensional shape data, The cost reduction for creating the exploded view could be realized.
However, in the technique described in this document, a disassembly line indicating how each part shape is disassembled and moved is not displayed.
On the other hand, Patent Document 2 is known as a method of displaying a line segment connecting parts shapes positioned by a geometric relationship. However, the technique described in this publication is based on an input of a geometric relationship. The object is to facilitate the editing of geometric relationships when positioning the shapes and assembling them into product shapes, and it is not a method of disassembling and displaying the product shapes according to the geometric relationships. Moreover, it has not been clearly shown what line segments are used to connect the component shapes.
In addition, the invention described in Patent Document 3 makes it possible to create a decomposition line of “axis and axis” and “plane and plane”. It was not clear how to create the line.
JP 2003-006245 A Japanese Patent Laid-Open No. 08-063495 JP 2003-208452 A

However, when creating an exploded view, the two types (FIGS. 1 (a) and (b)) of FIG. 1 showing examples of the assembly exploded line of the face alignment and the axis alignment are perpendicular to the axis as shown in FIG. It was not possible to create a decomposition line like the example of a simple decomposition line.
The present invention has been made in consideration of the above-described circumstances, and in “axis and axis”, a method, a program, and a program that can create a separation line perpendicular to the axis, and drawing the program are executed. It is an object of the present invention to provide a device that performs the above-described process.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a three-dimensional shape body is converted into a plurality of three-dimensional shape elements, and the three-dimensional shape elements are set according to a geometric relationship set between the three-dimensional shape elements. 3D shape body decomposition line display method for displaying the decomposition lines of the 3D shape body by forming a decomposition line that connects the 3D shape elements having the displayed geometric relations The geometric relationship between the three-dimensional shape elements is such that the axes are parallel to each other, and the decomposition line has one of the two-axis decomposition lines having the parallel geometric relationship as a start point and the other as an end point. It is characterized by a three-dimensional shape body decomposition line display method using line segments connecting both ends.
According to a second aspect of the present invention, a perpendicular line extending from a selected point extracted from one of the two axes as a starting point side to an axis from the other end point side of the two axes having the geometric relationship is the decomposition line. It is characterized by the above-mentioned three-dimensional shape body decomposition line display method.
According to a third aspect of the present invention, in the case where boundaries of the three-dimensional shapes including the two axes overlap, an intersection obtained by dropping a perpendicular from the picked point to the axis on the start point side is defined as the start point of the decomposition line. The three-dimensional shape body decomposition line display method according to claim 1 or 2 is characterized.
According to a fourth aspect of the present invention, when an axis on the start point side is selected and the axis is parallel to the line-of-sight vector, the decomposition line uses a point on the axis on the start point side. The three-dimensional shape body decomposition line display method according to any one of?
According to a fifth aspect of the present invention, a perpendicular extending from an intersection obtained by dropping a perpendicular from the point picked when the end-point-side axis is selected to the end-point-side axis to the start-point side axis, and the The three-dimensional shape body decomposition line display method according to any one of claims 1 to 4, wherein an intersection point with a boundary of a three-dimensional shape body model having an end point side axis is an end point.

In a sixth aspect of the present invention, when a boundary between the three-dimensional shape model having the end point side axis and the three-dimensional shape body model having the start point side axis overlaps, the end point side is determined from the determined point. The three-dimensional shape body decomposition line display method according to any one of claims 1 to 5, wherein an end point is an intersection obtained by dropping a perpendicular to an axis.
In the invention according to claim 7, when the axis on the start point side is selected, if the axis is parallel to the line-of-sight vector, a point on the axis on the start point side is used. The three-dimensional shape body decomposition line display method described in item 1 is characterized.
In the invention described in claim 8, when the start point and the end point cannot be connected by a straight line perpendicular to each axis, a decomposition line is created by a broken line composed of continuous horizontal and vertical line segments. The three-dimensional shape body decomposition line display method according to any one of the above.
According to a ninth aspect of the present invention, the start point and the end point are forcibly connected with a straight line based on information input from a user specified when the start point and the end point cannot be connected with a straight line perpendicular to the axis. The three-dimensional shape body decomposition line display method described in any one of the items is characterized.
The invention according to claim 10 is characterized in that a perpendicular extending from an intersection obtained from a specified point when the start point side axis is selected to the start point side axis to the end point side axis and The three-dimensional shape body decomposition line display method according to any one of claims 1 to 9, wherein an intersection point with a model boundary having an axis on the end point side is an end point.
The invention described in claim 11 is the three-dimensional shape body decomposition line display method according to claim 10, wherein when the boundary and the perpendicular do not intersect, the plane constituting the boundary is defined as an infinite plane. It is characterized by a three-dimensional shape body decomposition line display method in which the end point first intersects with an infinite plane.

Invention of Claim 12 is an apparatus which performs the method of Claims 1-11, Comprising: The input part which receives the input information from an input means, The memory | storage device which memorize | stored three-dimensional shape body information, A three-dimensional shape element pair extraction unit that acquires necessary three-dimensional shape body data from the storage device and extracts axis information from the three-dimensional shape element, and is displayed based on the axis information and input from the input unit A geometric relationship determination unit that determines whether or not there is a predetermined geometric relationship with the axis of the three-dimensional shape model including the axis on the start point side, and an end point side axis extracted by the geometric relationship determination unit is selected from the input unit In response, the start point and the end point are calculated by calculating the start point and the end point from the input start point side axis and the end point side axis from the respective axes and the respective three-dimensional shape models holding the respective axes. Decomposition to extract the decomposition line connecting It features an apparatus and a creating unit.
The invention described in claim 13 is a step of accessing a database to acquire necessary three-dimensional shape body data, extracting axis information from all the acquired three-dimensional shape elements, and displaying the axis information to the user. A first selection step that allows a user to select from axis information including an axial direction, a step of saving a bounding box of the model that holds the axis and the axis by inputting the axis on the start point side selected by the user; A second selection step for enabling the user to select an axis other than the axis held by the model including the selected axis and parallel to the selected axis, and confirming the input of the axis on the end point side selected by the user Saving the axis and the bounding box of the model that holds the axis, calculating the start point and end point from the saved pair of axes and bounding box, and generating the decomposition line connecting the end point and the start point and displaying it to the user Step Preparative, running, and wherein the program for executing the processing of the three-dimensional shape decomposition lines displayed on the computer.

  In the invention according to claim 14, the second selection step further includes a step of selecting an axis on the starting point side from the user, and an input by the user selection of the selected axis on the starting point side is confirmed. The step of saving the axis selected from the step, the step of confirming the input by the user selecting the end point axis, and the bounding box of the model including the start point side axis and the model including the end point axis overlap. A first determination step for determining whether or not, and in the first determination step, when the bounding boxes overlap, the start point is the intersection point where a perpendicular is drawn from the picked point to the axis on the start point side. And the step of setting the end point to the intersection point perpendicular to the axis on the end point side from the picked point, and in the first determination step, if the bounding boxes do not overlap, Gaze vector An axis determined by the system of the surface to be selected when the axis is selected in the second determination step, when the line-of-sight vector is parallel in the second determination step. Instead of the point where the upper point is picked, the point that intersects with the start point side axis is used instead of the intersection point, and when the start point side axis is selected, the point that is picked from the point that is perpendicular to the start point side axis is changed to the end point axis Step starting from the intersection of the bounding box of the model with the extended perpendicular and the axis on the start point, and the start point from the intersection where the perpendicular was drawn from the point picked when the end axis was selected to the axis on the end The step of setting the end point of the intersection of the bounding box of the model having the perpendicular line extending to the axis of the axis and the axis on the end point side, and if the line-of-sight vector is not parallel in the second determination step, the axis on the start point side From the point picked when selecting Steps starting at the intersection of the bounding box of the model with the perpendicular extending from the intersection perpendicular to the axis to the axis on the end and the axis on the end, and the point picked when selecting the axis on the end The computer according to claim 13, wherein the computer executes the step of ending the intersection of the bounding box of the model having the perpendicular line extending from the intersection point lowered from the intersection point to the axis on the end point side to the axis on the start point side and the axis on the end point side. It is a program for.

  According to the present invention, it is possible to display a separation line perpendicular to the axis between the three-dimensional shape elements such as “a separation line perpendicular to the axis” from the geometric structure. For this reason, it is possible to greatly improve the efficiency of creating an exploded view of a machine or the like designed by CAD or the like.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention will be described below with reference to the flowcharts of FIGS. 3 to 4, the system diagram shown in FIG. 5, and the block diagram of FIG.
FIG. 3 is a flowchart showing a method for disassembling the three-dimensional shape of the present invention to display a line.
In the method of the present invention, the creation of the decomposition line is executed according to the following flow according to the flowchart shown in FIG.
When the method for disassembling and displaying the three-dimensional shape of the present invention is started (step S01), the necessary three-dimensional shape body data is acquired by accessing the database, and from all the acquired three-dimensional shape elements. The axis information is extracted, and the axis information is displayed to the user so that the user can select from the axis information including the axial direction.
When the user selects an axis on the start point side and inputs it, the axis and the bounding box of the model holding the axis are saved.
Thereafter, the axis other than the axis parallel to the selected axis and held by the model including the selected axis is made selectable by the user (step S03).
When the user selects the end axis, confirm the user input, save the axis and the bounding box of the model that holds the axis, and start and end positions from the saved pair of axes and bounding box Is calculated (step S04).
Next, a decomposition line connecting the end point and the start point is generated and displayed so as to be confirmed to the user (step S05), and the process is ended (step S06).

Next, a method for determining the start point and the end point will be described with reference to the flowchart of FIG.
When this determination method is started (step S010), the axis on the start point side from the user is selected (step S011), and the user selection input of the axis on the selected start point side is confirmed and selected by the user. The axis is saved (step S012).
Next, when the input of the selection of the axis on the end point side is confirmed by the user (step S013), it is determined whether or not the bounding box of the model including the axis on the start point side and the model including the axis on the end point side overlaps (step S013). Step S014).
If the bounding boxes overlap in step S014, the process proceeds to step S015. If the bounding boxes do not overlap, the process proceeds to step S017. When the bounding box of the model having the start point side axis and the model having the end point side axis overlaps (step S014 → step S015), the intersection point obtained by dropping a perpendicular line from the picked point to the start point side axis is set as the start point ( Step S015).
Next, the intersection point where a perpendicular is drawn from the picked point to the axis on the end point side is set as the end point (step S016), and the process ends. The point to be picked is preferably a point on the selected axis. If a perpendicular line cannot be drawn with respect to the two axes selected from such points (the start point side axis 21 and the end point side axis 22), a point on the start point side axis is picked (a series of selectable picks). Or specify a point to extend the starting point side axis and pick on this extension line, and to set a perpendicular from the provided picked point to the end point axis. By providing, it can be calculated that the provided line segment is a decomposition line. Alternatively, an arbitrary point on the starting point side is picked, and a perpendicular line is drawn and extended from this point, and the distance between the two axes is calculated to be parallel from an arbitrary point on the vertical line. In step S014, if No In (Step S014 → Step S017), it is determined whether or not the axis on the starting point side and the line-of-sight vector are parallel (including the same) (Step S017).

In step S017, if the line-of-sight vector is parallel (Yes in step S017), the process proceeds to step S018, and if the line-of-sight vector is not parallel (No in step S017), the process proceeds to step S020.
In the case of Yes in step S017 (step S017 → step S020), the point on the axis determined by the system of the surface to be selected when selecting the axis is the intersection point where a perpendicular is drawn from the picked point to the starting point side axis. As a substitute, find a point of intersection from the point you picked when you selected the start point axis to the start point axis, and extend a perpendicular from that point to the end point axis. The starting point is the intersection of the bounding boxes of the model having (step S020).
Next, when the axis on the end point side is selected, an intersection point is drawn from the point picked to the axis on the end point side, and a perpendicular line is extended from the intersection point to the axis on the start point side. The intersection of the model's bounding boxes is set as the end point (step S021), and the process ends.
In the case of No in step S017 (step S017 → step S018), an intersection point where a perpendicular is drawn from the point picked when the start point side axis is selected to the start point side axis is obtained, and the end point side is obtained from the intersection point. A perpendicular is extended to the axis, and the intersection of the bounding box of the model having the perpendicular and the axis on the start point side is set as the start point (step S018).
Next, when the axis on the end point side is selected, an intersection point is drawn from the point picked to the axis on the end point side, and a perpendicular line is extended from the intersection point to the axis on the start point side. The intersection of the model's bounding box is set as the end point (step S019), and then the process ends. Note that the line-of-sight vector is a vector from the viewpoint toward a point of interest (for example, a point of interest having a three-dimensional shape), and is a vector from the viewpoint to the point of interest from the viewpoint to the point of interest or attention. When viewing three-dimensional shape elements in a geometric relationship between two three-dimensional shapes, the decomposition line and the line-of-sight vector may be parallel or the same.

Next, an apparatus for executing a program for decomposing a three-dimensional shape according to the present invention to display a line will be described below.
The program for disassembling and displaying the three-dimensional shape of the present invention is executed by being loaded by a computer device.
A configuration example of such an apparatus is shown in FIG.
That is, a normal computer having a device configuration as shown in FIG. 5 has a recording medium (for example, CD, DVD, other memory) on which a program for decomposing a three-dimensional shape and displaying a line is recorded, or this program. It can be executed by downloading from a server or the like via communication means such as the Internet.
Such a computer apparatus includes, for example, a CPU (Central Processing Unit) 10, a memory (at least one of a nonvolatile memory and a volatile memory) 11, and an input device (a keyboard, a mouse, or an input means such as an input display screen). At least one) 13 and a display device 14 for displaying to a user or the like. Furthermore, you may have the external memory | storage device 12 which memorize | stored three-dimensional shape data. The external storage device 12 may be accessible to the computer device or may be directly included in the computer device, or may be connected via communication means such as the Internet intranet.

In addition, the method of the present invention can be performed using an apparatus for directly executing the method of disassembling and displaying the three-dimensional shape of the present invention.
The apparatus for carrying out the method of the present invention preferably has a block configuration as shown in FIG.
The apparatus shown in FIG. 6 includes an input unit, a three-dimensional shape element pair extraction unit, a geometric relationship determination unit, a decomposition line creation unit, and a display unit.
When the data of the three-dimensional shape object from which the decomposition line is to be extracted is input from the input device, the input unit 1 sends the input data to the three-dimensional shape element pair extraction unit 2 (hereinafter simply referred to as “extraction unit 2”). (Step S01) The extraction unit 2 extracts an element pair from the input three-dimensional shape data (Step S02), and passes it to the geometric relationship determination unit 3.
In the geometric relationship determination unit, when the user selects an axis on the start point side and inputs it, the axis and the bounding box of the model holding the axis are saved, and then the selected axis is parallel and selected. A state other than the axis held by the model including the axis is made selectable by the user (step S03). Specifically, the start point and end point determination part in the method of disassembling the three-dimensional shape of the flowchart shown in FIG. 4 and displaying the line is executed.
In this step S03, in other words, in the method of disassembling the three-dimensional shape and displaying the line, the geometric relationship determination unit 3 performs the process of determining the start point and the end point obtained by the start point and end point determination portion (steps S011 to S021). The information obtained is passed to the decomposition line creation unit 4.
The decomposition line creation unit 4 executes the process of step S04 described above.
As a result, the display unit 5 generates a decomposition line connecting the end point and the start point, and performs a process of displaying the split line so as to be confirmed by the user (step S05).

  The present invention expands the user group of three-dimensional shape data with the spread of a three-dimensional CAD / CG system and the like, verifies the assemblability of actual products, and creates work procedure manuals such as disassembly / assembly. Therefore, it is possible to provide methods, programs, and apparatuses that can be widely used in fields where 3D shape data is effectively used, and the industrial applicability is analytical in a wide range of fields where image processing can be performed. Could be used.

It is a figure which shows the example of the assembly disassembly line of the conventional surface alignment and axis alignment. It is a figure which shows the example which extracted the line segment with the method of this invention, and is a figure which shows the example of the decomposition line perpendicular | vertical to an axis | shaft. It is a flowchart which shows the flow of the method of decomposing | disassembling the three-dimensional shape of this invention and displaying a line. It is a flowchart which shows the flow of the part which determines the start point and the end point in the method of decomposing | disassembling the three-dimensional shape of this invention, and displaying a line. It is a schematic block diagram of the apparatus for performing the three-dimensional shape decomposition line display program of this invention. It is a block diagram of the apparatus for performing the three-dimensional shape decomposition line display method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input part 2 3D shape element pair extraction part 3 Geometric relationship judgment part 4 Decomposition line creation part 5 Display part 10 CPU
11 Memory 12 External Storage Device 13 Input Device 14 Display Device 21 Start Point Side Axis 22 End Point Side Axis 23 Disassembly Line

Claims (14)

  The three-dimensional shape body is made into a plurality of three-dimensional shape elements, and the three-dimensional shape elements are disassembled and displayed so as to be separated from each other according to the geometric relationship set between the three-dimensional shape elements, and have the displayed geometric relationship A three-dimensional shape body decomposition line display method for forming a decomposition line connecting three-dimensional shape elements and displaying the decomposition line of the three-dimensional shape body, wherein the geometric relationship between the three-dimensional shape elements is such that the axes of each other are The three-dimensional shape body decomposition line is parallel, and the decomposition line is a line segment connecting both ends starting from one of the two-axis decomposition lines having the parallel geometric relationship and having the other as an end point. Display method.   The perpendicular line extending from the selected point extracted from one of the two axes as the start point side to the axis from the other end side of the two axes having the geometric relationship is the decomposition line. 3. The method for displaying a three-dimensional shape body decomposition line according to 1.   2. When the boundary of each of the three-dimensional shapes including the two axes overlaps, the intersection point where a perpendicular is drawn from the picked point to the axis on the start point side is set as the start point of the decomposition line. Or the three-dimensional shape body decomposition | disassembly line display method of 2 or 2.   4. The point according to claim 1, wherein when an axis on the start point side is selected and the axis is parallel to the line-of-sight vector, the decomposition line uses a point on the axis on the start point side. The three-dimensional shape body decomposition line display method according to claim 1.   A three-dimensional shape having a vertical line extending from an intersection obtained by dropping a perpendicular line from the point picked when the end-point axis is selected to the end-point axis to the start-point axis and the end-point axis 5. The three-dimensional shape body decomposition line display method according to claim 1, wherein an end point is an intersection with a boundary of the body model.   When the boundary between the three-dimensional shape model having the end-point axis and the three-dimensional shape model having the start-point side axis overlaps, the intersection point where a perpendicular is drawn from the determined point to the end-point axis is the end point The three-dimensional shape body decomposition line display method according to any one of claims 1 to 5, wherein:   The point on the axis on the start point side is used when the axis on the start point side is selected and the axis is parallel to the line-of-sight vector. 3D shape body decomposition line display method.   The separation line is created by a broken line composed of continuous horizontal and vertical line segments when they cannot be connected by straight lines perpendicular to the axes of the start point and the end point. The 3D shape body decomposition line display method according to the item.   9. The method according to claim 1, wherein the start point and the end point are forcibly connected by a straight line based on information input from a user specified when the start point and the end point cannot be connected by a straight line perpendicular to the axis. The 3D shape body decomposition line display method described in 1.   A boundary of a model having a perpendicular extending from the intersection point obtained by dropping a perpendicular from the specified point to the starting point axis when the starting point side axis is selected and the ending point axis. The method according to any one of claims 1 to 9, wherein the intersection point is an end point.   The three-dimensional shape body decomposition line display method according to claim 10, wherein when the boundary and the perpendicular do not intersect, the plane constituting the boundary is an infinite plane and the first intersection with the infinite plane is an end point. A method for displaying a three-dimensional shape body decomposition line.   An apparatus for executing the three-dimensional shape body decomposition line display method according to any one of claims 1 to 11, wherein an input unit that receives input information from input means and a memory that stores the three-dimensional shape body information An apparatus, a three-dimensional shape element pair extraction unit that obtains necessary three-dimensional shape body data from the storage device and extracts axis information from the three-dimensional shape element, and a display based on the axis information, from the input unit A geometric relationship determination unit that determines whether or not there is a predetermined geometric relationship with the axis of the three-dimensional shape body model including the input start point side axis, and the end point side axis extracted by the geometric relationship determination unit is the input Each start point and each end point are calculated from each of the input start point side axis and the end point side axis in response to being selected from the input unit, and from each three-dimensional shape body model that holds each axis. Extraction line connecting start point and end point And wherein the decomposition line creating unit, to have a that.   Accessing the database to acquire necessary 3D shape body data, extracting axis information from all acquired 3D shape elements, displaying the axis information to the user, and from the axis information including the axial direction to the user A first selection step for enabling selection, a step of saving a bounding box of the model that holds the axis and the axis by inputting the axis on the start point side selected by the user, and the selection axis is parallel and selected. A second selection step that allows the user to select other than the axis held by the model including the axis, and the input of the end-side axis selected by the user, and the boundary between the axis and the model holding the axis Performing a step of saving a box and calculating a start point position and an end point position from the saved pair of axes and a bounding box, and generating a decomposition line connecting the end point and the start point and displaying to the user; Compu Program for executing the processing of the three-dimensional shape decomposition lines displayed on the computer data. The second selection step includes
A step of selecting an axis on the starting point side from the user; a step of confirming an input by the user selection of the axis on the selected starting point side; storing the axis selected by the user; and an end point side from the user And a first determination step of determining whether or not a bounding box of a model including the start point side axis and a model including the end point side axis overlaps.
In the first determination step, when the bounding boxes overlap, a step of starting from an intersection point where a perpendicular is drawn from the picked point to the axis on the start point side, and a perpendicular line is drawn from the picked point to the axis on the end point side. And a step with the intersection point as the end point,
In the first determination step, when the bounding boxes do not overlap, a second determination step is performed in which it is determined whether or not the axis on the starting point side and the line-of-sight vector are parallel. In the second determination step, If the line-of-sight vector is parallel, the system of the surface to be selected when selecting the axis will select the axis on the starting point instead of the point of intersection from the picked point on the axis to the axis on the starting point side. A step that starts from the intersection of the model's bounding box that has a perpendicular line extending from the intersection of the picked point to the axis on the start point side to the axis on the end point side and the axis on the end point side. Executes the step where the intersection point of the model with the perpendicular line extending from the intersection point that dropped from the point picked when selecting the axis to the axis on the end point side to the axis on the start point side and the axis on the end point side is the end point And
In the second determination step, when the line-of-sight vector is not parallel, the line is extended from the intersection point where a perpendicular is drawn from the point picked when the start-point side axis is selected to the end-point axis. Step starting from the intersection of the bounding box of the model with the vertical axis and the start point axis, and extending from the picked point to the end point axis from the picked point when selecting the end point axis to the start point axis 14. The program for causing a computer to execute the program according to claim 13, wherein the step of ending an intersection of a model bounding box having a perpendicular line and an axis on the end point side is executed.

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