JP2006018589A - Operation module, cad apparatus and note entry method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation module capable of automating the entry of notes performed widely as a means for clearly indicating a design change part when the design of an article is changed. <P>SOLUTION: A note entry module 200 recognizes a comparison object data file 300 from a second model 100b and recognizes a comparison reference data file 301 from a first model 100a. The model information items are compared with each other and an overlapping model group 220 and a difference model group 221 are generated (S23). By using the overlapping model group 220, the difference model group 221 and the line-of-sight information of the comparison object data file 300, note entry coordinate data 222 are outputted (S24). When the note entry coordinate data 222 are calculated, in order to write the note to the two-dimensional drawing of the comparison object data file 300 with the layout information of the comparison object data file 300 as a reference, the note is added as the new attribute information of the comparison object data file 300 (S25). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an arithmetic module, a CAD device, and a note entry method included in a program mounted on a CAD device.

  Conventionally, CAD devices have been widely used for designing products having three-dimensional shapes such as products and parts constituting the products. In recent years, three-dimensional CAD that generates a virtual model in a virtual space has become widespread. The three-dimensional CAD that handles the virtual model displays the article in a three-dimensional manner in a pseudo manner, so that the shape intended by the designer can be converted into more accurate data, and even a person who does not have technical drawing expertise can easily recognize the shape. .

  On the other hand, when producing an article, in addition to shape information, it is essential to transmit attribute information such as dimensions, dimensional tolerances, geometrical tolerances and the like. In particular, when humans intervene in a process downstream of production, it is necessary to transmit attribute information in a form that can be recognized by humans. For this reason, as a means for transmitting attribute information, a technique for transmitting attribute information in a two-dimensional drawing based on a conventional drafting technique is widely used.

  As a specific example of this transmission method, a drafting module is installed in a three-dimensional CAD device or a three-dimensional CAD program, a two-dimensional drawing is generated from the three-dimensional model by this drafting module, and attribute information is described in the two-dimensional drawing. To be done.

Patent Document 1 proposes that an attribute arrangement plane, which is a virtual plane to which attribute information can be associated, is arranged in a virtual space, and attribute information is arranged on the attribute arrangement plane.
JP 2002-324086 A

  However, the design of articles using the conventional CAD device has the following problems. In other words, even after the initial design, design changes often occur to improve functionality, reliability, or productivity, and when changes are made, it is necessary to transmit the details of the changes quickly and reliably to downstream processes. was there.

  In a so-called hand-drawn drawing or a drawing using two-dimensional CAD as means for clearly indicating a design change portion, a note such as a symbol or a pictograph may be written in the design change portion. In addition, the same note may be written in a 3D CAD device or a 3D CAD program, and the 2D drawing or attribute layout plane generated by the drafting module conforms to the handwritten drawing or 2D CAD drawing. In some cases, notes were included. In either case, the notes were written manually, and there was a risk of omissions due to frequent work.

  Accordingly, the present invention provides an arithmetic module, a CAD device, and a note entry method that can automate the description of notes that have been widely performed as means for clearly indicating design change points when the design of an article is changed. With the goal.

  In order to achieve the above object, an arithmetic module of the present invention is an arithmetic module included in a program installed in a CAD apparatus, and includes a first model and a second model changed from the first model. A model reading step that is read as an input value, and a first calculation that compares the first model and the second model, calculates a common model composed of overlapping parts, and calculates a difference model composed of non-overlapping parts A second calculation step of calculating a note entry position for describing a difference between the first model and the second model, and calculating the note entry position calculated from the second model. And an output step of outputting as attribute information when displayed on a three-dimensional drawing.

    The CAD apparatus according to the present invention is a CAD apparatus that supports model design, and includes a model reading unit that reads a first model and a second model changed from the first model as input values; The first model is compared with the second model, a common model composed of overlapping parts is calculated, a difference model consisting of non-overlapping parts is calculated, and the first model and the second model are calculated. A second calculation means for calculating a note entry position for describing differences between the models, and the calculated note entry position is output as attribute information for displaying the second model on a two-dimensional drawing. Output means.

  A note entry method according to the present invention is a note entry method for a CAD apparatus that supports design of a model, and includes a model reading step of reading a first model and a second model changed from the first model as input values. A first calculation step of comparing the first model with the second model, calculating a common model including overlapping portions, and calculating a difference model including non-overlapping portions; A second calculation step of calculating a note entry position for describing a difference between the model and the second model, and the calculated note entry position when the second model is displayed on a two-dimensional drawing. And an output step of outputting as attribute information.

  A note entry method according to the present invention is a note entry method for a CAD apparatus that supports design of a model, and includes a model reading step of reading a first model and a second model changed from the first model as input values. A first calculation step of comparing the first model with the second model, calculating a common model composed of overlapping parts, and calculating a difference model consisting of non-overlapping parts, and a predetermined gaze direction A second calculation step of calculating a note entry position for describing the difference between the first model and the second model from the first model, and the calculated note entry position on the projected view from the line-of-sight direction. And an output step of outputting as attribute information when displaying the second model.

  According to the arithmetic module according to the present invention, it is possible to automate the description of notes that have been widely performed as means for clearly indicating the design change portion when the design of an article is changed. As a result, it is possible to reduce the load on the operator related to the description of the note and to prevent the description of the note from being omitted. Further, when a projection view from the line-of-sight direction is generated, it can be determined whether or not a design change portion is described in the projection view, and it is also possible to avoid the description of unnecessary notes.

  Embodiments of an arithmetic module, a CAD apparatus, and a note entry method according to the present invention will be described with reference to the drawings.

[First Embodiment]
In the first embodiment, an arithmetic module mounted on a three-dimensional CAD apparatus having a drafting function is shown.

(Configuration of CAD device)
FIG. 1 is a diagram illustrating a configuration of a three-dimensional CAD apparatus according to the first embodiment. The CAD device 1 includes a CPU 2, an internal storage unit 3, an external storage unit 4, a display unit 5, an input unit 6, an external connection unit 7, and the like. Here, the internal storage unit 3 may be a semiconductor memory. An example of the external storage unit 4 is a magnetic storage device. The external storage unit 4 stores a three-dimensional CAD program for executing the processing of the present embodiment. Further, the three-dimensional CAD device can be connected to an output device such as a printer or a plotter, a server device, or the like via the external connection unit 7.

  When the operator gives an instruction to start the three-dimensional CAD program via the input unit 6, the three-dimensional CAD program stored in the external storage unit 4 is read into the internal storage unit 3 by the CPU 2 and executed. The three-dimensional CAD program forms a three-dimensional model in the virtual space in accordance with an operator instruction input via the input unit 6. In addition, it is possible to arbitrarily set the line-of-sight direction for creating a projection view of the created three-dimensional model.

(Article design procedure)
FIG. 2 is a flowchart showing a processing procedure for designing an article using three-dimensional CAD. When designing an article, the operator first creates a three-dimensional model corresponding to the intended article in the virtual space of the three-dimensional CAD program, and the created three-dimensional model is stored in the internal storage unit 3 ( Step S10). When the intended three-dimensional model is completed, the line-of-sight direction setting process is executed in accordance with an instruction from the operator (step S11). In the process of step S11, the line-of-sight direction corresponding to the projection drawing that needs to be converted into a two-dimensional drawing is set.

  Further, the drafting module is activated and operated according to the operator's instruction to execute the layout process of the two-dimensional drawing (step S12). Here, the drafting module generates a projection drawing of the three-dimensional model based on the set line-of-sight direction, and generates a drawing frame for arranging the generated projection drawing. The operator can perform the layout of the two-dimensional drawing while confirming the arrangement of the projection drawing within the drawing frame.

  Thereafter, attribute information is registered (given) in accordance with an operator's instruction (step S13). Here, the attribute information is information attached to the three-dimensional model, such as dimensions, dimensional tolerances, geometrical tolerances, and articles. The registered (given) attribute information is displayed on the two-dimensional drawing described above.

  FIG. 3 is a diagram showing the relationship among the three-dimensional model, the line-of-sight direction, and the projection view. The first model 100a is an example of a three-dimensional model. The first line-of-sight direction 101a and the second line-of-sight direction 102a are examples of the line-of-sight direction. The first projection diagram 103a and the second projection diagram 104a are examples of generated projection diagrams. FIG. 4 is an example of a two-dimensional drawing. This two-dimensional drawing is created through the above procedure. In the drawing frame 105, a first projection 103a and a second projection 104a are arranged, and first attribute information 106 and second attribute information 107 are given. The created three-dimensional model is recorded as a data file together with the associated line-of-sight direction, layout information, attribute information, and the like. The data file is recorded in a server device connected via the external connection unit 7 or the external storage unit 4.

(Design change procedure for goods)
When a design change is required for the created data file, the 3D CAD device reads the data file into the internal storage unit 4 and makes necessary modifications to the drawing stored in the read data file. I do. Then, a note for clearly indicating the design change part is described on the two-dimensional drawing. Here, the three-dimensional CAD program of this embodiment has a note entry module for automatically writing out a note related to a shape change of a three-dimensional model in a two-dimensional drawing.

  FIG. 5 is a diagram showing the relationship among the three-dimensional model, the line-of-sight direction, and the projection view when the design is changed. When the design of the first model 100a (see FIG. 3) is changed to the shape of the second model 100b (see FIG. 5), the processing of the note entry module will be described. Here, the third line-of-sight direction 101b and the fourth line-of-sight direction 102b have the same settings as the first line-of-sight direction 101a and the second line-of-sight direction 102a, respectively.

(Calculation method of note position)
FIG. 6 is a diagram schematically showing the processing of the note entry module 200. The note entry module 200 includes the 3D model information, the line-of-sight information, the layout information on the 2D drawing, the attribute information, and the 3D model information of the comparison reference data file serving as a comparison reference. This is a module for registering a note related to a shape change as data in the comparison target data file as attribute information. The note entry module 200 includes a note entry coordinate calculation module 201 and an attribute addition module 202. The note entry coordinate calculation module 201 includes a model comparison submodule 210 and a coordinate calculation submodule 211.

  Here, in accordance with an instruction from the operator, the note entry module 200 is activated in a state where the data file whose design has been changed is opened. FIG. 7 is a flowchart showing the processing procedure of the note entry module 200. When the note entry module 200 is activated, it first recognizes the comparison target data file 300 to be compared and the comparison reference data file 301 to be the comparison reference (step S21). In the present embodiment, the note entry module 200 automatically recognizes the opened data file as the comparison target data file 300 and asks the operator to specify the comparison reference data file 301. When the operator specifies the comparison reference data file 301, the note entry module 200 reads the model information, line-of-sight information, layout information of the comparison target data file 300, and model information of the comparison reference data file 301 (step S22). .

  That is, in the present embodiment, the note entry module 200 automatically recognizes the data file related to the second model 100b (see FIG. 5) as the comparison target data file 300, and then requests the operator to specify the reference data file 301. After the data file related to the first model 100a (see FIG. 3) is recognized as the comparison reference data file 301 in accordance with the operator's designation, the above-described information is read.

  Thereafter, the note entry module 200 activates the model comparison sub-module 210, and the model comparison sub-module 210 compares the model information of the comparison target data file 300 with the model information of the comparison reference data file 301. A duplicate model group 220 corresponding to a part and a difference model group 221 corresponding to a difference part between the two models are generated (step S23). FIG. 8 is a diagram showing the overlap model group 220 and the difference model group 221. In this embodiment, the first model 100a and the second model 100b are compared, the first overlap model 110 (see FIG. 8A) as the overlap model group 220, and the first difference model 121 as the difference model group 221. A second difference model 122 (see FIG. 8B) is generated. If no difference model is generated at this stage, the note entry module 200 informs the operator that there is no difference and terminates automatically.

  Then, the note entry module 200 activates the coordinate calculation submodule 211, and the coordinate calculation submodule 211 uses the position information of the duplicate model group 220 and the difference model group 221 and the line-of-sight information of the comparison target data file 300 based on the position information. The note entry coordinate data 222 composed of the note entry coordinates indicating the position where the note is entered is output (step S24).

  FIG. 9 is a flowchart showing the calculation processing procedure of the note entry coordinate data by the coordinate calculation submodule 211 in step S24. The coordinate calculation submodule 211 performs processing on all the line-of-sight included in the line-of-sight information of the comparison target data file 300 and all the difference models constituting the difference model group 221. First, in a state where the overlapping model group 220 is arranged in the virtual space, the difference model is projected in the line-of-sight direction (step S31).

  Since the overlapping model group 220 is also arranged in the virtual space, there are cases where a projection view of the difference model is generated and when it is not generated. Therefore, it is determined whether or not a projection diagram of the difference model is generated (step S32). When the projection map is not generated, this process is terminated. On the other hand, when the projection drawing is generated, the center-of-gravity coordinates of the projected part are calculated (step S33), and the calculated center-of-gravity coordinates are stored as one of the note entry coordinate data 222 (step S34). Thereafter, this process is terminated.

  FIG. 10 is a diagram showing note entry coordinate data. For example, in the case of the first overlap model 110 (see FIG. 8A), the first difference model 121, and the second difference model 122 (see FIG. 8B), projection is performed in the third line-of-sight direction 101b. A first projection shape 121x corresponding to the first difference model 121 is generated. Then, the coordinates of the centroid point T1 of the first projection shape 121x are calculated and included in the note entry coordinate data 222. Similarly, when projection is performed on the second difference model 122 in the third line-of-sight direction 101b, a second projection shape 122x is partially generated. Then, the coordinates of the barycentric point T 2 are calculated and stored as the note entry coordinate data 222.

  On the other hand, in the fourth line-of-sight direction 102b, the first difference model 121 is hidden by the overlapping model 110, so that a projection shape is not generated and the coordinate value of the barycentric point is not calculated. On the other hand, a third projection shape 122y corresponding to the second difference model 122 is generated. Then, the coordinates of the barycentric point T3 are calculated and stored as the note entry coordinate data 222.

  FIG. 11 is a diagram showing the relationship among the three-dimensional model, the line-of-sight direction, the projected view, and the barycentric point when the design is changed. Each center-of-gravity point T1, T2, T3 is shown superimposed on FIG. In addition, the relationship among the second model 100b, the third line of sight 101b, the fourth line of sight 102b, the third projection 103b, the fourth projection 104b, and the center points T1, T2, and T3 is shown.

  When the note entry coordinate data 222 is calculated by the process of step S24, the note entry module 200 activates the attribute addition module 202, and the attribute addition module 202 makes a note entry based on the layout information of the comparison target data file 300. The annotation is registered as new attribute information of the comparison target data file 300 so that the annotation corresponding to the coordinate data 222 is written in the two-dimensional drawing of the comparison target data file 300 (step S25). FIG. 12 is a diagram showing a two-dimensional drawing of the second model 100b as a result of adding new attribute information. In the two-dimensional drawing of the second model 100b, star-shaped notes M1, M2, and M3 corresponding to the centroids T1, T2, and T3 are added as attribute information. Thereafter, the processing of the note entry module is terminated.

  As described above, according to the three-dimensional CAD apparatus of the first embodiment, when the design of an article is changed, it is possible to automate the description of a note that has been widely performed as a means for clearly indicating a design change portion. As a result, it is possible to reduce the load on the operator related to the description of the note and to prevent the description of the note from being omitted. Further, when a projection view from the line-of-sight direction is generated, it is possible to determine whether or not a design change portion is described in the projection view, thereby avoiding unnecessary notes. Further, it can be applied to a three-dimensional CAD apparatus having a drafting module.

[Second Embodiment]
In the first embodiment, an arithmetic module mounted on a three-dimensional CAD apparatus having a drafting module is shown. However, in the second embodiment, an attribute arrangement plane arranged in the three-dimensional model space is supported. The calculation module mounted in the three-dimensional CAD apparatus is shown. Here, the attribute arrangement plane is arranged in a virtual space as a virtual plane to which attribute information can be associated, and attribute information is arranged on this attribute arrangement plane. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 13 is a diagram showing the relationship between the first model before the design change, the line-of-sight direction, and the attribute arrangement plane. FIG. 13A shows the first model 100a before the design change, the first line-of-sight direction 101a, the second line-of-sight direction 102a, the first attribute arrangement plane 400a corresponding to the first line-of-sight direction 101a, and the second line-of-sight direction 102a. The relationship of the second attribute arrangement plane 401a corresponding to is shown. In the three-dimensional CAD corresponding to the attribute arrangement plane, a projection view can be displayed in a pseudo manner by displaying the three-dimensional model and the attribute arrangement plane along the direction facing the attribute arrangement plane, that is, the line-of-sight direction. Is possible. In FIG. 13B and FIG. 13C, this pseudo projection view is displayed. That is, FIG. 13B shows a state where the first model 100a and the first attribute arrangement plane 400a are displayed from the first line-of-sight direction 101a. FIG. 13C shows a state in which the first model 100a and the first attribute arrangement plane 401a are displayed from the second line-of-sight direction 102a. FIG. 14 is a diagram illustrating a relationship among the second model after the design change, the line-of-sight direction, and the attribute arrangement plane. FIGS. 14A, 14B, and 14C correspond to FIGS. 13A, 13B, and 13C, respectively.

  Also in the second embodiment, the note entry module 200 (see FIG. 6) is activated to make a note entry. The activated note entry module 200 recognizes the comparison target data file 300 and the comparison reference data file 301 as a comparison reference, as in the first embodiment. That is, in this embodiment, the data file related to the second model 100b is recognized as the comparison target data file 300, and the data file related to the first model 100a is recognized as the comparison reference data file. However, in the present embodiment, the layout information in the data file is information related to the arrangement of the attribute arrangement plane.

  When the comparison target data file 300 and the comparison reference data file 301 are recognized, the note entry module 200 enters a note according to the same procedure as in the first embodiment. That is, the first overlap model 110 (see FIG. 8A), the first difference model 121 and the second difference model 122 (see FIG. 8B) are generated, and the first overlap model 110 is arranged. An attempt is made to generate a projection view of each difference model in the line-of-sight direction, and the barycentric coordinates in the generated projection shape are calculated (see FIG. 10).

  Thereafter, the calculated barycentric coordinates (here, the coordinate data of the barycenters T1, T2, and T3) and the layout information of the comparison target data file 300 (here, the third attribute arrangement plane 400b and the fourth attribute arrangement plane 401b) Add notes based on the layout information. FIG. 15 is a diagram illustrating a state in which notes M1 and M2 are added to the third attribute arrangement plane 400b and a note M3 is added to the fourth attribute arrangement plane 401b.

  As described above, according to the three-dimensional CAD apparatus of the second embodiment, it is possible to cope with a three-dimensional CAD apparatus that can display a pseudo projection view and corresponds to an attribute arrangement plane.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  Further, the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above embodiments to a system or apparatus, and the computer (or CPU, MPU, etc.) of the system or apparatus stores the storage medium. It is also achieved by reading out and executing the program code stored in. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention.

  Examples of the storage medium for supplying the program code include a ROM, a floppy (registered trademark) disk, a memory card such as a PCMCIA card and a compact flash (registered trademark), a hard disk, a micro DAT, a magneto-optical disk, a CD-R, and the like. You may comprise with optical disks, such as CD-RW, phase change type optical disks, such as DVD. The program code may be downloaded via a network.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) or the like running on the computer is actually executed based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing a part or all of the process and the process is included.

  Further, after the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This includes the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

It is a figure which shows the structure of the three-dimensional CAD apparatus in 1st Embodiment. It is a flowchart which shows the process sequence of the design of the articles | goods using three-dimensional CAD. It is a figure which shows the relationship between a three-dimensional model, a gaze direction, and a projection view. It is a figure which shows an example of a two-dimensional drawing. It is a figure which shows the relationship between the three-dimensional model at the time of design change, a gaze direction, and a projection drawing. It is the figure which modeled the process of the note entry module 200. FIG. 10 is a flowchart showing a processing procedure of the note entry module 200. It is a figure which shows the duplication model group 220 and the difference model group 221. It is a flowchart which shows the calculation process sequence of the note entry coordinate data by the coordinate calculation submodule 211 in step S24. It is a figure which shows note entry coordinate data. It is a figure which shows the relationship between a three-dimensional model at the time of design change, a gaze direction, a projection figure, and a gravity center point. It is a figure which shows the two-dimensional drawing of the 2nd model 100b of the result of having added new attribute information. It is a figure which shows the relationship between the 1st model before a design change, a gaze direction, and an attribute arrangement | positioning plane. It is a figure which shows the relationship between the 2nd model after a design change, a gaze direction, and an attribute arrangement | positioning plane. It is a figure which shows the state which added notes M1 and M2 to the 3rd attribute arrangement | positioning plane 400b, and added note M3 to the 4th attribute arrangement | positioning plane 401b.

Explanation of symbols

1 3D CAD system 2 CPU
110 First overlap model 121 First difference model 122 Second difference model 200 Note entry module 201 Note entry coordinate calculation module 202 Attribute addition module 210 Model comparison submodule 211 Coordinate calculation submodule 220 Duplicate model group 221 Difference model group 222 Note entry Coordinate data 300 Comparison target data file 301 Comparison reference data file

Claims (10)

An arithmetic module included in a program installed in a CAD device,
A model reading step for reading the first model and the second model changed from the first model as input values;
A first calculation step of comparing the first model with the second model, calculating a common model composed of overlapping parts, and calculating a difference model consisting of non-overlapping parts;
A second calculation step of calculating a note entry position for describing a difference between the first model and the second model;
And an output step of outputting the calculated note entry position as attribute information for displaying the second model on a two-dimensional drawing.   The second calculation step calculates a note entry position for describing a difference between the first model and the second model from a predetermined gaze direction, and the output step projects from the gaze direction. 2. The calculation module according to claim 1, wherein the calculation module is output as attribute information when the second model is displayed in the figure.   The second calculation step includes a determination step of determining whether or not a projection view of the difference model from the line-of-sight direction is generated, and when the projection view of the difference model is generated, The calculation module according to claim 2, further comprising: a center-of-gravity coordinate calculation step of calculating a center-of-gravity coordinate, wherein the calculated center-of-gravity coordinate is set as the annotation entry position.   The arithmetic module according to claim 2, further comprising: a line-of-sight direction reading step for reading the line-of-sight direction as an input value. The program installed in the CAD device includes a drafting module that generates a two-dimensional drawing from a three-dimensional model,
5. The output step according to claim 2, wherein, in the output step, the projection drawing is output to a drawing frame generated by the drafting module, and the annotation entry position is output to the projection drawing. Arithmetic module. Included in a program installed in a CAD device that displays an attribute placement plane on which attribute information is placed,
3. The calculation according to claim 2, wherein in the output step, the annotation entry position is output to a projection drawing generated in a pseudo manner by displaying a three-dimensional model and an attribute arrangement plane along the line-of-sight direction. module. A CAD device that supports model design,
A model reading means for reading the first model and the second model changed from the first model as input values;
A first calculating means for comparing the first model with the second model, calculating a common model composed of overlapping portions, and calculating a difference model consisting of non-overlapping portions;
Second calculating means for calculating a note entry position for marking a difference between the first model and the second model;
A CAD apparatus comprising: output means for outputting the calculated note entry position as attribute information for displaying the second model on a two-dimensional drawing. The second calculation means includes:
An annotation entry position for describing a difference between the first model and the second model from a predetermined line-of-sight direction is calculated, and the output means adds the second model to a projection view from the line-of-sight direction. 8. The CAD apparatus according to claim 7, wherein the CAD information is output as attribute information for display. A CAD device annotation method for supporting model design,
A model reading step for reading the first model and the second model changed from the first model as input values;
A first calculation step of comparing the first model with the second model, calculating a common model composed of overlapping parts, and calculating a difference model consisting of non-overlapping parts;
A second calculation step of calculating a note entry position for describing a difference between the first model and the second model;
An output step of outputting the calculated note entry position as attribute information when the second model is displayed on a two-dimensional drawing. A CAD device annotation method for supporting model design,
A model reading step for reading the first model and the second model changed from the first model as input values;
A first calculation step of comparing the first model with the second model, calculating a common model composed of overlapping parts, and calculating a difference model consisting of non-overlapping parts;
A second calculation step of calculating a note entry position for describing a difference between the first model and the second model from a predetermined line-of-sight direction;
An output step of outputting the calculated annotation entry position as attribute information when the second model is displayed in a projection view from the line-of-sight direction.

Images