JP2003233631A - Model transformation program and model transformation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a model transformation program and model transformation method for transforming a model, capable of simply and quickly transforming the model by automatically calculating a candidate of a back side and displaying the same when the face of the model displayed on a screen is specified, and specifying the back side among the displayed candidates of the back sides to give directions for movement or the like. <P>SOLUTION: This system includes a means for recognizing an object face to be moved, which is specified on the model displayed on the screen, a means for detecting the candidate for the face corresponding to the specified face of the model and displaying the same, and a means for moving the object face to the directed moving position while keeping the positional relationship of the object face to be moved and the face candidate when moving directions are given to the displayed face candidate or the selected face candidate in the case where there are a plurality of face candidates to transform the model. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model modification program and a model modification method for modifying a model.

[0002]

2. Description of the Related Art Conventionally, when a CAD system is used to deform the shape of a three-dimensional model, for example, when the left side surface of the model A in FIG. Since we had to specify all faces,
The left side of the model A is designated in (a) of FIG. 4, and the plane is made visible by rotating the model A as shown in (b) of FIG. 4 and all the faces to be moved are designated. Then, while the information such as the distance between these two specified surfaces is held, it is moved to the left, and the desired model B shown in FIG.
Was being generated.

[0003]

Therefore, there are the following problems.

(1) It is necessary to always specify the back surface after designating the front surface. For this reason, from the state where the front surface of FIG. 4 (a) is visible on the screen, the back surface of FIG. 4 (b) is displayed. There is a problem in that an operation for rotating so as to be visible and a processing time for that are required.

(2) Further, when the model is rotated on the screen so that the surface can be seen, it is difficult to determine which of the surfaces corresponds to the surface when the model has a complicated shape, and the model is repeated many times. There was also a problem that it was necessary to rotate and check.

The present invention solves these problems.
If you specify a face of the model displayed on the screen, the face candidates are automatically calculated and displayed, and you can specify the face from the displayed face candidates to instruct movement, etc., and deform the model easily and quickly. The purpose is to do.

[0007]

[Means for Solving the Problems] Means for solving the problems will be described with reference to FIG.

In FIG. 1, the CAD system 1 is for creating a model, and here, the element operating means 4 is used.
It is composed of etc.

The element operating means 4 operates various elements for changing the shape of the created model. Here, the surface recognizing means 41, the normal obtaining means 42, the surface candidate detecting means 43, and the distance calculating means. 44, sorting means 45, plane determining means 46, moving means 47 and the like.

The surface recognizing means 41 is for recognizing the specified surface when the surface to be moved is specified from the model displayed on the screen.

The normal acquisition means 42 acquires the normal of the surface of the model. The surface candidate detecting means 43 detects a candidate of a surface (surface) having a normal line that is substantially parallel to the normal line of the specified surface.

The surface distance calculation means 44, for surface candidates,
The distance from the designated surface is calculated.

The sorting means 45 sorts the distances of surface candidates in ascending order.

The face determining means 46 determines a face (face) designated from the face candidates as a face (face) corresponding to the designated face.

The moving means 47 deforms the model by moving it in response to a movement instruction while holding the designated surface of the model and the positional relationship between the surfaces.

Next, the operation will be described. The surface recognition means 41 recognizes (detects) the specified surface when the surface to be moved is specified from the model displayed on the screen, and the surface candidate detection means 43 corresponds to the surface of the specified model. The surface of the model to be moved is calculated and displayed as a candidate, and when there is a movement instruction for the displayed surface candidate or a plurality of selected surface candidates, the movement target surface and the surface candidate are selected. The model is deformed by moving it to the designated movement position while maintaining the positional relationship.

At this time, the normal acquisition means 42 calculates the normals of the designated surface to be moved and the other surface of the model, and the surface candidate detection means 43 makes the normals of the surfaces forming the model substantially parallel. The thing is made to be a surface candidate.

Further, the normal acquisition means 42 calculates the normal of the specified surface to be moved and the normal of the other surface of the model, and the surface candidate detection means 43 determines the normal of the surface forming the model. The substantially parallel ones are detected as surface candidates, and when there are a plurality of surface candidates, the distance calculating means 44 calculates the distance from the surface to be moved to each surface candidate, and the sorting means 45 sorts them in order and lists them. I have to.

Therefore, when a face of the model displayed on the screen is designated, a face candidate is automatically calculated and displayed, and by designating a face from the displayed face candidates and instructing movement or the like, The model can be transformed easily and quickly.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments and operations of the present invention will be sequentially described in detail with reference to FIGS.

FIG. 1 shows a system configuration diagram of the present invention.
In FIG. 1, a CAD system 1 reads a program from an external storage device or a recording medium (not shown), loads it on a memory and starts it to create a model. Here, an element creating means 2 and an element management are provided. Means 3,
It is composed of the element operation means 4, the DB control means 5, and the like.

The element creating means 2 is for creating the elements constituting the model. The element management means 3 manages the elements that make up the model.

The element operating means 4 is for performing various operations on the elements constituting the model. Here, the element operating means 4 is for operating various elements for changing the shape of the created model. The line acquisition means 42, the surface candidate detection means 43, the distance calculation means 44, the sorting means 45, the surface determination means 46, the movement means 47, and the like.

The surface recognizing means 41 is for recognizing the specified surface when the surface to be moved is specified from the model displayed on the screen.

The normal acquisition means 42 acquires the normal of the surface of the model. The surface candidate detecting means 43 detects a candidate of a surface (surface) having a normal line that is substantially parallel to the normal line of the specified surface.

The distance calculating means 44 calculates the distance from the designated surface for each surface candidate.

The sorting means 45 sorts the distances of surface candidates in ascending order.

The surface determining means 46 determines a surface (surface) designated from the surface candidates as a surface (surface) corresponding to the designated surface.

The moving means 47 deforms the model by moving it in response to a movement instruction while maintaining the designated surface of the model and the positional relationship between the surfaces.

The DB control means 5 is a CAD database 6
It stores and reads model data in.

The display device 7 displays a model or the like. The input device 8 is various input devices, such as a mouse and a keyboard.

Next, the operation of the configuration of FIG. 1 will be described in detail according to the order of the flowchart of FIG.

FIG. 2 shows a flowchart for explaining the operation of the present invention. In FIG. 2, the normal vector of the designated plane is acquired in S1. This is to acquire the normal vector of the designated surface (the surface to be moved) in (a-1) of FIG. 3 to be described later. The normal vector is a vector that is the center of the surface and is perpendicular (normal) to the surface.

In S2, the plane normal vector is checked. For this, for example, the normal vectors of all the planes other than the designated plane of the model in (a-1) of FIG. 3 are sequentially examined.

In S3, it is determined whether or not it is parallel to the normal vector of the designated plane. This is to determine whether or not the normal vector of a surface other than the specified surface examined in S2 and the normal vector of the specified surface are parallel (or almost parallel). In the case of YES, it is determined that they are parallel to each other, and the candidate for the surface (surface) corresponding to the designated surface (surface) is set, and S4 and subsequent steps are executed. On the other hand, in the case of NO, since it is determined that the plane is not parallel and is not a candidate for a plane, the process returns to S2 and the next plane is examined.

If the result of S3 is YES and it is determined that the two are parallel, S4
Check the distance to the specified plane with. This is to calculate and examine the distance between the designated surface and the surface whose normal vector is parallel.

In S5, the checked data is added to the list.
In S6, it is determined whether or not the normal vector has been checked for all the planes. In the case of YES, all the candidates have been extracted, for example, as shown in (b-1) of FIG.
Proceed to. If NO, the process returns to S2 and is repeated.

In S7, the list is sorted in order of distance. For example, the distance to the surface designated in association with the surface ID of the unsorted candidate surface in (b-1) of FIG. 3 to be described later is sorted by the distance, and (b-2) in FIG. After sorting.

In step S8, the plane with the shortest distance is taken out. In step S9, a plane echo is performed. These S8, S9
Then, the shortest surface ID “101001” is taken out in the state after sorting shown in FIG. 3B-2, which will be described later, and the echo (emphasis of the surface of FIG. 3A-2 corresponding to the extracted surface is emphasized. (Display) is performed to display that the surface is a surface corresponding to the specified surface (a-1) in FIG.

In S10, it is determined whether the plane is the one intended by the user. If YES, move the plane in S12, that is,
As shown in (a-3) of FIG. 3 which will be described later, while the positional relationship between the designated surface and the displayed surface is maintained, the model is moved to the left by the designated distance to deform the model. To do. On the other hand, in the case of NO in S10, the next candidate is extracted in S11, for example, the next candidate is extracted from the sorted table in (b-2) of FIG. repeat.

As described above, when the user designates, for example, the left side surface of the model of (a-1) shown in FIG. 3 as the surface to be moved, the surface almost parallel to the normal vector of the surface. Is extracted from the surface of the model and the distance to the designated surface is calculated, and the distance is sorted by the distance. The surface having a short distance is highlighted as the surface of (a-2) in FIG. Then, with the specified face,
It is possible to easily move to a specified position and deform the model as shown in (a-3) of FIG. 3 while maintaining the positional relationship with the surface automatically calculated and displayed.

FIG. 3 shows an explanatory view of the present invention. FIG. 3A shows a case where the surface echoed first is OK.

FIG. 3A-1 shows the shape of the model before deformation displayed on the screen. The user designates a surface of the illustrated model as a movement target with a mouse or the like.

FIG. 3A-2 shows candidates calculated according to the flowchart of FIG. 2 described above when the surface in FIG. 3A-1 is designated by the user as the surface to be moved. The surface (surface) of is highlighted.

FIG. 3A shows the model after deformation. This is because when the user responds with OK in the state of (a-2) in FIG. 3, while maintaining the positional relationship between the surface designated by and the surface of, the leftward direction is designated by the designated distance. Shown after the model is deformed by moving to.

In FIG. 3B-1, when the surface of FIG. 3A-1 is designated as the surface to be moved, YES processing of S2 to S6 of the flowchart of FIG. 2 described above is performed. An example of a table (list) in which all surface IDs and distances of the candidates whose parallel normal vectors are parallel is calculated and set is shown below.

FIG. 3 (b-2) shows an example of a table after sorting (b-1) of FIG. 3 in ascending order of distance.

FIG. 3C shows the case where the planes are sequentially selected. This is an example of a case where the shape of the model is more complicated than that of (a-1) in FIG. 3, and is a model that is substantially parallel to the normal vector of the surface to be moved specified in (c-1). An example of a table in which the surface ID of each surface and the distance (distance to the designated movement target surface) are associated and registered is shown, and (c-1) is sorted in ascending order of distance. An example of a table is shown. As described above, in the case of a model having a complicated shape as compared with (a-1) in FIG. 3, there are a large number of face (face) candidates corresponding to the designated face, and the models are sequentially selected and selected. As shown in FIG. 3A-2, when the user confirms and confirms OK, the positional relationship between the OK surface (one or more) and the specified surface is maintained,
It is possible to deform the model by moving it in the specified direction.

(Supplementary Note 1) Means for recognizing a designated surface to be moved on the model displayed on the screen, and means for detecting and displaying candidate planes corresponding to the designated model surface. When there is a movement instruction for the surface candidate displayed or the selected surface candidate when there are multiple surface candidates, the surface is moved to the instructed movement position while maintaining the positional relationship between the surface to be moved and the surface candidate. A model transformation program for causing a computer to function as a means for transforming the model.

(Supplementary Note 2) The normal line of the specified surface to be moved is acquired, and the normal lines of the surfaces forming the model are substantially parallel to each other as the above-mentioned candidate plane. The model transformation program described.

(Supplementary Note 3) The normal of the specified surface to be moved is obtained, and the normals of the surfaces forming the model are substantially parallel to each other as the above-mentioned surface candidates. The model transformation program according to claim 1, wherein the model transformation program is sorted and listed in the order of distances from the surface to be moved to each surface candidate.

(Supplementary Note 4) In the model transformation method for transforming a model, a step of designating a surface to be moved from the model displayed on the screen and a candidate of a plane corresponding to the surface of the designated model are designated. When there is an instruction to move the step of calculating and displaying and the surface candidate displayed above or the selected surface candidate when there are multiple surface candidates, the instruction is performed while maintaining the positional relationship between the surface to be moved and the surface candidate. The model is deformed by moving the model to the moved position.

(Supplementary note 5) The normal of the specified surface to be moved is calculated, and the normals of the surfaces forming the model are set to be substantially parallel to each other. 4. The model transformation method described in 4.

(Supplementary Note 6) In a model transforming device for transforming a model, it corresponds to means for recognizing a designated surface to be moved on the model displayed on the screen and to the surface of the designated model. Means for detecting and displaying surface candidates, and holding the positional relationship between the surface to be moved and the surface candidate when there is an instruction to move the surface candidate displayed or the selected surface candidate when there are multiple surface candidates And a means for deforming the model by moving the model to an instructed movement position as it is.

(Supplementary Note 7) Means for recognizing a designated surface to be moved on the model displayed on the screen in a computer-readable recording medium storing a model deformation program for deforming the model; A means for detecting and displaying surface candidates corresponding to the surface of the specified model, and a target to be moved when a movement instruction is given for the surface candidate displayed above or a selected surface candidate when there are a plurality of surface candidates. While maintaining the positional relationship between faces and face candidates,
A computer-readable recording medium recording a program for causing a computer to function as a means for deforming the model by moving the model to a designated movement position.

[0056]

As described above, according to the present invention,
When the face of the model displayed on the screen is specified, the face candidates are automatically calculated and displayed, and the face is selected from the displayed face candidates, and the movement is designated.
The model can be transformed easily and quickly. As a result, it becomes possible to automatically recognize the surface on the back side of the surface specified by the user and move both surfaces as a unit.

Further, it is also effective for editing a model created nonparametrically (without specifying the positional relationship between one shape and another shape in the model).

[Brief description of drawings]

FIG. 1 is a system configuration diagram of the present invention.

FIG. 2 is a flowchart explaining the operation of the present invention.

FIG. 3 is an explanatory diagram of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

1: CAD system 4: Element operation means 41: Face recognition means 42: means for obtaining normal 43: Surface candidate detecting means 44: Distance calculation T means 45: Sorting means 46: Face determining means 447: Transportation means 5: DB control means 6: CAD database 7: Display device 8: Input device

Claims (5)

[Claims] 1. A means for recognizing a designated surface to be moved on a model displayed on a screen, and a means for detecting and displaying a candidate surface corresponding to the designated model surface. When there is a movement instruction for the selected surface candidate or when there are multiple surface candidates displayed, move them to the specified movement position while maintaining the positional relationship between the surface to be moved and the surface candidate. A model transformation program for causing a computer to function as a means for transforming the model. 2. The normal of the specified surface to be moved is acquired, and the normals of the surfaces forming the model are substantially parallel to each other as the surface candidates. Model transformation program. 3. A normal line of the specified surface to be moved is acquired, and the normal lines of the surfaces forming the model are substantially parallel to each other, and when there are a plurality of surface candidates, the movement is performed. The model transformation program according to claim 1, wherein the model transformation program is sorted and listed in the order of distances from the face to be made to each face candidate. 4. A model transforming method for transforming a model, which comprises the step of recognizing a designated target surface to be moved on the model displayed on the screen, and a step of recognizing a surface corresponding to the designated model surface. The step of detecting and displaying a candidate, and when there is a movement instruction for the surface candidate displayed above or a selected surface candidate when there are multiple surfaces, the surface to be moved and the positional relationship between the surface candidates are retained. And a method of deforming the model by moving the model to a designated movement position. 5. The surface candidate of the specified target to be moved is acquired, and the normals of the surfaces forming the model are substantially parallel to each other, and the surface candidate is selected. Model deformation method.