JP4968118B2 - Attribute value giving device and attribute value giving program - Google Patents

Description

  The present invention relates to an attribute value assigning device and an attribute value assigning program, and more particularly to an attribute value assigning device and an attribute value assigning program for assigning an R attribute value to a ridge line of a part having a shape indicated by interplane information.

  In the design stage of thin plate parts such as automobile shell bodies, there is a roundness called fillet shape at the boundary (ridgeline) between the faces of the actual parts, but this rounding is omitted and CAD (Computer Aided Design) is used. In general, parts are examined based on the interpenetrating surface data indicating the created model.

  In this examination, a numerical value (R attribute value) of the radius value of the fillet shape is given to the ridge line, and this R attribute value is used for a reminder at the design stage or for future fillet modeling.

  As a technique related to such a fillet, in Patent Literature 1, when there is a candidate ridge line to be traced next, among the candidate ridge lines to be traced next, in addition to the created ridge lines of the temporary fillet surface, A technique for excluding a ridge line in which a bending angle between curved surfaces is within a predetermined range is disclosed.

  Further, Patent Document 2 sequentially acquires edges that are sequentially connected to specified edges and have specified characteristics or attributes, and connects the acquired edges to the specified edges to form a composite curved surface. A process of generating is disclosed.

Further, in Patent Document 3, based on the phase data, out of a plurality of ridge lines including a representative ridge line and continuously connected to each other, ridge lines other than the representative ridge line are sequentially searched for, and the representative ridge line and both sides of the searched ridge line are found. A technique is disclosed in which each part formed by is designated as a fillet surface.
JP-A-8-137717 JP-A-6-259510 JP-A-6-266808

  Although it is necessary to give an R attribute to each of the ridge lines of the model shown in the above-mentioned interpenetrating surface data, the ridge line often branches into a plurality of parts, and furthermore, there are various branch patterns. In the processing by the conventional tool capable of assigning the attribute, it can only be given to a continuous ridge line that does not branch.

  As described above, since the conventional tool is not practical, the side viewing the ridge line determines the ridge line that propagates the R attribute value by manually putting a simple expression such as “constant R5” on the perspective view. It has become. Therefore, the man-hours for completely assigning the R attribute are enormous.

  As described above, the conventional technique has a problem in that the R attribute value cannot be automatically assigned to the edge of the model indicated by the interpenetrating plane data.

  The present invention has been made to solve the above-described problems, and includes an attribute assigning apparatus and an attribute value assigning program capable of automatically assigning an R attribute value to a ridge line of a model indicated by interpenetrating plane data. The purpose is to provide.

  In order to solve the above-mentioned problem, the invention of claim 1 is characterized in that the recording means in which the interpenetrating surface information indicating the shape of the part including the ridge line is recorded, and the component indicated by the interpenetrating surface information recorded in the recording means. Among the ridge lines included in the ridge line, the ridge line sandwiched between the fold lines different from the fold direction of the plane that sandwiches the ridge line with the R attribute value, which is the radius value of the fillet shape, is assigned in advance. Exclusion means for excluding from candidate ridgelines that may give R attribute values, and from one end point of the assigned ridgeline to the other end point via the candidate ridgeline after exclusion by the exclusion means Trace from a group of loop ridgelines consisting of ridgelines that pass through and one end point of the given ridgeline to a terminal ridgeline that does not have a ridgeline adjacent to one end point via the candidate ridgeline after exclusion by the exclusion means Candidate ridge line group extracting means for extracting a normal ridge line group consisting of ridge lines that pass through and the ridge line group having the largest number of ridge lines belonging to the ridge line group extracted by the candidate ridge line group extracting means When there are different ridge line groups having a common ridge line in the ridge line group extracted by the group extracting means and the candidate ridge line group extracting means, the ridge line branched from the common ridge line and the branch ridge line Any of the maximum angle ridge line group extracting means for extracting a ridge line group including a ridge line with the largest angle formed, the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means When one ridge line group is extracted by such means, the grant means for giving the same R attribute value as the R attribute value of the given ridge line to the ridge lines belonging to the extracted ridge line group

  According to the first aspect of the present invention, the recording unit records the interpenetrating surface information indicating the shape of the part including the ridgeline. The excluding means includes a folding direction of a surface sandwiching a given ridge line to which an R attribute value that is a radius value of a fillet shape is given in advance among ridge lines included in a part indicated by the interpenetration surface information recorded in the recording means. A ridge line sandwiched between surfaces having different folding directions is excluded from candidate ridge lines that may be given the R attribute value of the assigned ridge line.

  Candidate ridge line group extraction means is a loop ridge line group consisting of ridge lines from one end point of the given ridge line to the other end point via the candidate ridge line after exclusion by the exclusion means, and the grant Extract a normal ridge line group consisting of ridge lines from one end point of the completed ridge line through the candidate ridge line after exclusion by the excluding means until reaching a terminal ridge line where there is no ridge line adjacent to the one end point .

  The most frequent ridge line group extracting unit extracts the ridge line group having the largest number of ridge lines belonging to the ridge line group extracted by the candidate ridge line group extracting unit, and the maximum angle ridge line group extracting unit is extracted by the candidate ridge line group extracting unit. If there is a different ridge line group having a common ridge line in the ridge line group, the ridge line group including the ridge line having the largest angle between the ridge line branched from the common ridge line and the branch ridge line is Extracting and adding means is extracted when one ridge line group is extracted by any one of the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means. The same R attribute value as the R attribute value of the given ridge line is assigned to the ridge line belonging to the ridge line group.

  The ridge line group extracted by any one of the candidate ridge line group extraction means, the most frequent ridge line group extraction means, and the maximum angle ridge line group extraction means has the same R attribute as the R attribute value of the assigned ridge line Since it is a ridge line that has a high possibility of being a value, it is possible to provide an attribute assigning apparatus that can automatically assign an R attribute value to a ridge line of a model indicated by the interpenetrating plane data.

  In the present invention, as in the invention of claim 2, the exclusion means has already been given an R attribute value among the ridge lines included in the part indicated by the interpenetration surface information recorded in the recording means. A ridge line is further excluded from the candidate ridge lines.

  According to the second aspect of the present invention, it is possible to avoid changing the attribute value of a ridge line to which an appropriate R attribute value has already been assigned to an R attribute value that is highly likely to be inappropriate.

  Further, according to the present invention, as in the invention of claim 3, the assigning means is extracted by any one of the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means. When the ridge line group is the loop ridge line group and the normal ridge line group, the same R attribute value as the R attribute value of the assigned ridge line is given only to the ridge lines belonging to the loop ridge line group. May be.

  According to invention of Claim 3, the said R attribute value can be provided only with respect to the ridgeline which belongs to the loop ridgeline group with high possibility of having the same R attribute value.

  In order to solve the above-mentioned problem, the invention of claim 4 is the fillet-shaped radius value among the ridge lines included in the part indicated by the interpenetrating surface information indicating the shape of the part including the ridge line recorded in the recording means. From a candidate ridge line that may give the R attribute value of the assigned ridge line, a ridge line that is sandwiched between faces that have a folding direction different from the folding direction of the face that sandwiches the assigned ridge line to which a certain R attribute value is assigned in advance. Exclusion means to be excluded, a loop ridge line group consisting of ridge lines that pass from one end point of the assigned ridge line to the other end point through the candidate ridge line after exclusion by the exclusion means, and the assigned A normal ridge line consisting of ridge lines that pass from one end point of the ridge line to the terminal ridge line that does not have a ridge line adjacent to the one end point via the candidate ridge line after exclusion by the exclusion means Candidate ridge line group extracting means for extracting the ridge line group having the largest number of ridge lines belonging to the ridge line group extracted by the candidate ridge line group extracting means, and the candidate ridge line group extracting means If there are different ridge lines having a common ridge line among the ridge lines extracted by the above, the ridge line that branches from the common ridge line and the ridge line that makes the largest angle between the ridge line that is the branch source is included. One ridge line group is extracted by any one of the maximum angle ridge line group extracting means for extracting the ridge line group, the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means. An attribute value assigning program for causing the computer to function as an assigning means for assigning the same R attribute value as the R attribute value of the assigned ridgeline to the ridgelines belonging to the extracted ridgeline group. It is a lamb.

  Since the invention of claim 4 operates in the same manner as that of claim 1, the same effect as that of the invention of claim 1 can be obtained.

  According to the present invention, it is possible to provide an attribute assigning device and an attribute value assigning program capable of automatically assigning an R attribute value to a ridge line of a model indicated by interphase data. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the structure of the attribute value provision apparatus 10 which concerns on this Embodiment is demonstrated using FIG. The attribute value assigning apparatus 10 includes a CPU (Central Processing Unit) 20, a ROM (Read Only Memory) 21, a RAM (Random Access Memory) 22, an HDD (Hard Disk Drive) 23, which are connected via a bus B, respectively. A display unit 24, an operation input unit 25, and a communication interface 26 are included.

  The CPU 20 governs the overall operation of the attribute value assigning apparatus 10, and a program to be described later is executed by the CPU 20. The ROM 21 is a non-volatile storage device that stores a boot program that operates when the attribute value assigning device 10 is activated. The RAM 22 is a volatile storage device in which an OS (Operating System), programs, and data are expanded. The HDD 23 is a non-volatile storage device in which interphase information indicating the shape of a part including a ridgeline, an OS, and the like are recorded. The display unit 24 displays various information. The operation input unit 25 is used when an operator operates the attribute value assigning device 10 or inputs information to the attribute value assigning device 10. The communication interface 26 is an interface for communicating with other information processing apparatuses, and is a NIC (Network Interface Card), a USB device, or the like. This communication interface 26 is used, for example, when acquiring component information from another information processing apparatus. However, when acquiring component information using a USB memory, a flexible disk, or the like, or when the HDD 23 stores pre-existing plane information. In such a case, the communication interface 26 is not an essential component.

  Hereinafter, the attribute value assigning process executed by the attribute value assigning apparatus 10 will be described with reference to a flowchart. Prior to this explanation, the outline of the process using the actual shape of the part will be described using two parts. explain. Note that the R attribute value used in the following description indicates the radius value of the fillet shape.

  FIG. 2A shows a first part having a ridgeline. An overview of processing for assigning an R attribute value to the ridgeline shown in FIG. 2A will be described. First, FIG. 2 (B) shows a case in which uppercase letters A to F are assigned to the surface of the component shown in FIG. 2A and lowercase letters a to i are assigned to the ridge lines. In FIG. 2B, sides that are not ridge lines are represented by dotted lines. Further, the assigned ridge line to which the R attribute value is assigned in advance is defined as a ridge line a.

  Next, the folding direction is shown in order to exclude the ridge line sandwiched between the planes having the folding direction different from the folding direction of the plane sandwiching the ridge line a from the candidate ridge lines that may give the R attribute value of the ridge line a. The figure is shown in FIG.

  This folding direction will be described. The surfaces sandwiching the ridge line a are surfaces A and B, and the shape formed by the surfaces A and B is broken at the ridge line a. And this broken shape is a shape which becomes convex with respect to the other side seeing from this side.

  On the other hand, the surfaces sandwiching the ridge line d are the surfaces C and D, and the shape formed by the surfaces C and D is broken at the ridge line d. And this broken shape is a shape which becomes concave with respect to the other side seeing from this side.

  These irregularities are the folding directions of the surfaces sandwiching the ridgeline. A method for determining the unevenness will be described with reference to FIG. As shown in FIG. 3A, information for giving a direction to each surface is given to the interpenetration surface information in advance. In the case of FIG. 9A, only surfaces A and F are shown. Both arrows are given to face forward.

  Then, the intersection of the planes A and F with the vector parallel to the ridge line i as the normal vector is two line segments as shown in FIG. 2B, and the angle formed by these two line segments. Ask for. In this case, as shown in FIG. 5B, two angles θ1 and θ2 are obtained. Of these, the angle on the side where the surface direction is located is the angle formed by these two line segments. Accordingly, in the case of FIG. 5B, the angle formed by θ1.

  When the angle θ formed in this way is obtained, it is determined that it is concave when 0 ° <θ <180 °, and is convex when 180 ° <θ <360 °. Since side i is a ridge line, θ does not become 0 ° or 180 °.

  By the determination method described above, the folding direction can be obtained for each ridge line as shown in FIG.

  When the folding direction is obtained in this way, it is now possible to give the R attribute value of the ridge line a to the ridge line sandwiched between the fold lines different from the folding direction of the face that sandwiches the ridge line a to which the R attribute value is assigned in advance. Exclude from potential candidate edges.

  In the case of FIG. 2C, since the folding direction of the surface sandwiching the ridge line a is convex, the ridge lines d and f (shown by dotted lines) sandwiched between the concave surfaces different from the direction of the ridge line a are It will be excluded from candidate ridge lines that may be given an R attribute value.

  At this time, there are five candidate ridgelines, ridgelines b, c, e, g, and i. From these candidate ridge lines, first, a loop ridge line group consisting of ridge lines that pass from one end point of the ridge line a to the other end point via the candidate ridge line is extracted. In the case of (C) in the figure, when one end point is connected to the ridge line c among the end points of the ridge line a, there is no ridge line connected to the other end point, so the number of loop ridge line groups is zero. .

  Next, from these candidate ridgelines, a normal ridgeline group consisting of ridgelines that pass from one end point of the ridgeline a to the terminal ridgeline that does not have a ridgeline adjacent to one end is extracted. . In the same figure, the terminal ridge lines where there is no ridge line adjacent to one end are the ridge lines b, g, i excluding the ridge line a.

  Therefore, as shown in FIG. 4, three normal ridge line groups are extracted. When the ridge line group is expressed by enclosing the ridge lines belonging to the ridge line group in parentheses, the ridge line group shown in FIG. 4A is {a, b} (referred to as the ridge line group A), and FIG. The ridge line group shown in FIG. 2 is {a, c, e, h, i} (referred to as the ridge line group B), and the ridge line group shown in FIG. 2C is {a, c, e, h, g } (Referred to as ridge line group C).

  In the case of the figure, a plurality of (three) ridge line groups are extracted, but when only one ridge line group is extracted, the same R attribute value as that of the ridge line a is given to the ridge line group. .

  Next, the ridge line group having the largest number of ridge lines belonging to the ridge line group is extracted from the extracted ridge line group. This is because the ridge lines belonging to the ridge line group having the largest number of ridge lines belonging to it are highly likely to have the same R attribute value.

  In the case of the figure, the number of ridge lines belonging to the ridge line group A is 2, the number of ridge lines belonging to the ridge line group B is 5, and the number of ridge lines belonging to the ridge line group C is 5. Therefore, the ridge line groups B and C are extracted. Here, a plurality of (two) ridge line groups are extracted, but when only one ridge line group is extracted, the same R attribute value as that of the ridge line a is given to the ridge line group.

  Next, when there are different ridge line groups having a common ridge line in the extracted ridge line group, the ridge line having the largest angle between the ridge line branched from the common ridge line and the ridge line of the branch source Extract a ridge line group including.

  This is because the ridge line that branches at the largest angle is likely to have the same R attribute value.

  In the case of the figure, the ridge lines common to the ridge line groups B and C are the ridge lines a, c, e, and i, and the branching ridge lines are the ridge line i in the ridge line group B and the ridge line g in the ridge line group C. A ridge line connected to the branch ridge line is a ridge line h.

  Accordingly, the angle formed by the common ridge line h connected to the branch ridge lines g and i is θ for the ridge lines h and i, and is φ for the ridge lines h and g. In the case of the figure, since φ <θ, the ridge line group B is extracted.

  The same R attribute value as the R attribute value of the ridge line a is given to the ridge lines (c, e, h, i) belonging to the ridge line group B extracted in this way.

  As described above, a ridge line group composed of ridge lines to which an R attribute value is given may be extracted, but as shown in FIG. 5, such a ridge line group may not be extracted. If the R attribute value is given to the ridge line (c, e, h, i) by the above process (in the figure, the ridge line is expressed as R), the ridge line to which the R attribute value has already been assigned is selected. In order to further exclude the ridge line from the ridge line, the ridge line b is not extracted because the candidate ridge line to be connected does not exist and is isolated.

  Next, an outline of processing will be described using the second part shown in FIG. The part shown in FIG. 6A is a part that protrudes from the front to the back. Also for this part, as shown in FIG. 6B, uppercase letters A to F are assigned to the surface of the part, and lowercase letters a to l are assigned to the ridge lines. In FIG. 6B, sides that are not ridge lines are represented by dotted lines. Further, the assigned ridge line to which the R attribute value is assigned in advance is defined as a ridge line a.

  Next, the folding direction is shown in order to exclude the ridge line sandwiched between the planes having the folding direction different from the folding direction of the plane sandwiching the ridge line a from the candidate ridge lines that may give the R attribute value of the ridge line a. This is shown in FIG.

  The folding direction is as described above. When the folding direction is obtained, there is a possibility that the R attribute value of the ridge line a is given to the ridge line that is sandwiched between the fold lines that are different from the folding direction of the surface that sandwiches the ridge line a to which the R attribute value is assigned in advance. Exclude from candidate edges.

  In the case of FIG. 6C, since the folding direction of the surface sandwiching the ridge line a is convex, the ridge lines i, j, k, and l (shown by dotted lines) sandwiched by the concave surface different from that direction are , The R attribute value of the ridge line a is excluded from candidate ridge lines that may be given.

  At this time, there are seven candidate ridge lines, ridge lines b, c, d, e, f, g, and h. From these candidate ridge lines, first, a loop ridge line group consisting of ridge lines that pass from one end point of the ridge line a to the other end point via the candidate ridge line is extracted. In addition, a loop expresses returning from the ridgeline a to the ridgeline a again.

  In the case of FIG. 2C, ridge lines b and d are connected to both ends of the ridge line a. Then, as shown in FIG. 7 (A), the route passes from one end point to the other end point via the candidate ridge line (in order of a → b → c → d → a, or reverse order). There is a loop ridge line group {a, b, c, d} composed of ridge lines, and the number of loop ridge line groups is 1 in the case of FIG.

  Next, a normal ridge line group consisting of ridge lines that pass from one end point of the ridge line a to a terminal ridge line that does not have a ridge line adjacent to one end is extracted. The terminal ridge lines where there is no ridge line adjacent to one end are the ridge lines e, f, g, and h. Accordingly, there are four normal ridge line groups that reach from the ridge line a to the ridge lines e, f, g, and h, as in the normal ridge line group {a, e} shown in FIG.

  Hereinafter, as described above, the ridge line group having the largest number of ridge lines belonging to the ridge line group is extracted, and in the extracted ridge line group, when there are different ridge line groups having a common ridge line, from the common ridge line A ridge line group including a ridge line having the largest angle between the branch ridge line and the branch source ridge line may be extracted. However, as illustrated in FIG. 7, the extracted ridge line group is a loop ridge line group. In the case of the normal ridge line group, the same R attribute value as the R attribute value of the ridge line a may be given only to the ridge line belonging to the loop ridge line group that is likely to have the same R attribute value. In this case, the same R attribute value as the R attribute value of the ridge line a is given to the ridge lines b, c, and d.

  Details of the processing described above will be described using a flowchart. The process described below is executed by the CPU 20.

  First, the entire R attribute value addition process shown in FIG. 8 showing the overall flow of the process of assigning the R attribute value will be described. In step 101, interplanetary surface information is acquired from the HDD 23. This interpenetrating surface information includes at least the direction of the surface described above and the R attribute value of the 0th ridge line described later. In addition, about the direction of a surface, the process which provides the direction of a surface may be provided previously, and you may make it perform this process.

  In the next step 102, the ridge line counter j is initialized with zero. The ridge line counter is for counting the number of ridge lines.

  In the next step 103, it is determined whether or not an R attribute value is given to the ridge line j which is the j-th ridge line. If a negative determination is made in step 103, an R attribute value giving process is performed in step 104, and the process proceeds to step 105.

  On the other hand, if a negative determination is made in step 103, it is not necessary to assign an R attribute value to the ridge line j, and the process proceeds to step 105.

  In step 105, the counter j is incremented by one. In step 106, it is determined whether j is N or more. Since N is the total number of ridge lines included in the component information indicated by the interpenetrating surface information, the determination in step 106 is a step of determining whether or not R attribute values have been assigned to all the ridge lines.

  Next, the R attribute value assigning process of step 104 will be described with reference to the flowchart of FIG. First, in step 201, an exclusion process is performed to exclude from candidate ridge lines that may be given the R attribute value of ridge line j. In the next step 202, a loop ridge line group extraction process is performed for extracting a loop ridge line group consisting of ridge lines that pass from one end point of the ridge line j described in FIG. 6 to the other end point via the candidate ridge line.

  In the next step 203, it is determined whether or not the number of ridge line groups extracted in the loop ridge line group extraction process is greater than zero. In the present embodiment, when the extracted ones are the loop ridge line group and the normal ridge line group, only the ridge line belonging to the loop ridge line group is given the same R attribute value as the R attribute value of the ridge line j. ing. Therefore, when the loop ridge line group is extracted, the normal ridge line group is not extracted, and the process proceeds to step 206.

  If a negative determination is made in step 203 above, in step 204, a ridge line that passes from one end point of the ridge line j through a candidate ridge line to a terminal ridge line that does not have an adjacent ridge line is formed. A normal ridge line group extraction process for extracting a normal ridge line group is performed.

  In the next step 205, it is determined whether or not the number of ridge line groups extracted in the normal ridge line group extraction process is greater than zero. If the determination in step 205 is negative, there is no ridge line to which the R attribute value is assigned (see FIG. 5), and the process is terminated.

  On the other hand, if the determination in step 205 is affirmative, in the next step 206, the same R attribute value as that of the ridge line j is assigned to the ridge line belonging to the ridge line group extracted in any of the above steps 202 and 204, and the process is performed. Exit.

  Next, the exclusion process in step 201 will be described with reference to the flowchart of FIG. First, in step 301, a ridge line sandwiched by a surface having a folding direction different from the folding direction of the surface sandwiching the ridge line j is excluded from candidates, and in step 302, a ridge line to which an R attribute value has already been assigned is extracted from the candidate ridge line. Exclude further.

  Next, the loop ridge line group extraction processing in step 202 will be described with reference to the flowchart of FIG. First, in step 401, a ridge line group that is a loop is extracted from the ridge line j. In the next step 402, it is determined whether or not the number of extracted ridge line groups is zero. If the determination in step 402 is affirmative, the process is terminated as it is, and if the determination is negative, in step 403, the ridge line group having the largest number of ridge lines belonging to the ridge line group is extracted, and the extracted ridge line group R attribute that extracts a ridge line group including a ridge line that has the largest angle between the ridge line that branches from the common ridge line and the ridge line that is the branch source when there are different ridge lines that have a common ridge line. A value-giving ridge line group extraction process is performed, and the process ends.

  Next, the normal ridge line group extraction processing in step 204 will be described with reference to the flowchart of FIG. First, in step 501, a ridge line group consisting of ridge lines that are passed through until reaching a ridge line where no ridge line adjacent to one end exists is extracted from the ridge line j.

  In the next step 502, it is determined whether or not the number of extracted ridge line groups is zero. If the determination in step 502 is affirmative, the process is terminated as it is. If the determination is negative, in step 503, the R attribute value-giving ridge line group extraction process described above is performed, and the process ends.

  Next, the R attribute value-giving ridge line group extraction process will be described with reference to the flowchart of FIG. First, in step 601, a group of ridge lines with the largest number of ridge lines included is extracted. In the next step 602, it is determined whether or not the number of extracted ridge line groups is one. When the number of ridge line groups is 1, since it is determined that an R attribute value is assigned to the ridge line group, the process ends.

  When a negative determination is made in step 602, in step 603, a ridge line group including a ridge line that has the largest angle between the ridge line branched from the common ridge line and the branch ridge line is extracted, and the process is terminated. .

  As described above, in the present embodiment, a loop ridge line group consisting of ridge lines that pass from one end point of the assigned ridge line to the other end point via the candidate ridge line after exclusion, and the assigned ridge line A normal ridge line group consisting of ridge lines that pass from the one end point to the terminal ridge line that does not have a ridge line adjacent to the one end point is extracted via the candidate ridge line after exclusion by the exclusion unit (candidate ridge line) Group extraction means). If the number of ridge line groups extracted at this time is 1, an R attribute value is assigned to the ridge line group.

  When there are a plurality of extracted ridge line groups, the ridge line group having the largest number of ridge lines belonging to the ridge line group is extracted (the most frequent ridge line group extracting means). If the number of ridge line groups extracted at this time is 1, an R attribute value is assigned to the ridge line group.

  A plurality of ridge lines that have the largest number of ridge lines are extracted, and if there are different ridge lines that have a common ridge line in the extracted ridge lines, the ridge line that branches from the common ridge line and the ridge line that is the branch source A ridge line group including a ridge line having the largest angle is extracted (maximum angle ridge line group extracting means). An R attribute value is assigned to the extracted ridge line group. Since different ridge line groups always have ridge lines with different angles, the number of ridge line groups extracted here is one. An R attribute value is assigned to this ridge line group.

  In this way, when one ridge line group is extracted by any one of the candidate ridge line group extracting unit, the multi-ridge line group extracting unit, and the maximum angle ridge line group extracting unit, the ridge line belonging to the extracted ridge line group Is assigned the same R attribute value as the R attribute value of the assigned edge line.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which such changes or improvements are added are also included in the technical scope of the present invention.

  Further, the above embodiments do not limit the invention according to the claims (claims), and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Absent. The embodiments described above include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, as long as an effect is obtained, a configuration from which these some constituent requirements are deleted can be extracted as an invention.

  In addition, the processing flow of the various processing programs shown in the embodiment (see FIGS. 8, 9, 10, 11, 12, and 13) is also an example, and does not depart from the gist of the present invention. Needless to say, it can be changed as appropriate.

It is a figure which shows the structure of the attribute value provision apparatus which concerns on embodiment. It is a figure (the 1) which shows the process outline | summary which assign | provides R attribute value to a ridgeline. It is a figure which shows the judgment method of an unevenness | corrugation. It is FIG. (2) which shows the process outline | summary which assign | provides R attribute value to a ridgeline. It is a figure which shows the example in which a ridgeline group is not extracted. It is FIG. (3) which shows the process outline | summary which assign | provides R attribute value to a ridgeline. It is FIG. (4) which shows the process outline | summary which assign | provides R attribute value to a ridgeline. It is a flowchart which shows R attribute value provision whole processing. It is a flowchart which shows an attribute value provision process. It is a flowchart which shows an exclusion process. It is a flowchart which shows a loop ridgeline group extraction process. It is a flowchart which shows a normal ridgeline group extraction process. It is a flowchart which shows R attribute value provision ridgeline group extraction processing.

Explanation of symbols

10 attribute value assigning device 20 CPU
23 HDD
24 display

Claims (4)

A recording means in which interphase information indicating the shape of the part including the ridgeline is recorded;
Of the ridge lines included in the component indicated by the interpenetration surface information recorded in the recording means, a fold direction different from the fold direction of the plane sandwiching the applied ridge line to which the R attribute value, which is a radius value of the fillet shape, is assigned in advance. Exclusion means for excluding a ridge line sandwiched between the surfaces to be excluded from candidate ridge lines that may give the R attribute value of the given ridge line;
From one end point of the given ridge line, from a loop ridge line group consisting of ridge lines that pass through the candidate ridge line after exclusion by the exclusion means to reach the other end point, and from one end point of the given ridge line A candidate ridge line group extracting means for extracting a normal ridge line group consisting of ridge lines that are passed through the candidate ridge line after exclusion by the exclusion means until reaching a terminal ridge line that does not exist adjacent to one end point; and
Of the ridge line groups extracted by the candidate ridge line group extracting means, the most ridge line group extracting means for extracting the ridge line group having the largest number of ridge lines belonging thereto;
When there are different ridge line groups having a common ridge line among the ridge line groups extracted by the candidate ridge line group extracting means, the angle formed between the ridge line branched from the common ridge line and the ridge line of the branch source is the largest. A maximum angle ridge line group extracting means for extracting a ridge line group including an ridge line to be an angle;
When one ridge line group is extracted by any one of the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means, the ridge lines belonging to the extracted ridge line group An assigning means for assigning the same R attribute value as the R attribute value of the given ridge line,
An attribute value assigning device.   2. The exclusion means further excludes, from the candidate ridge lines, ridge lines to which an R attribute value has already been assigned among ridge lines included in a part indicated by the interpenetration surface information recorded in the recording means. Attribute value assignment device.   The assigning means includes the loop ridge line group and the normal ridge line group extracted by any one of the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means. In this case, the attribute value assigning device according to claim 1 or 2, wherein the same R attribute value as the R attribute value of the given ridge line is given only to a ridge line belonging to the loop ridge line group. Among the ridge lines included in the component indicated by the interpenetration surface information indicating the shape of the component including the ridge line recorded in the recording unit, the surface sandwiching the already-applied ridge line to which the R attribute value that is the radius value of the fillet shape is provided in advance Exclusion means for excluding a ridge line sandwiched between planes having a folding direction different from the folding direction of the candidate ridge line that may give the R attribute value of the given ridge line;
From one end point of the given ridge line, from a loop ridge line group consisting of ridge lines that pass through the candidate ridge line after exclusion by the exclusion means to reach the other end point, and from one end point of the given ridge line A candidate ridge line group extracting means for extracting a normal ridge line group consisting of ridge lines that are passed through the candidate ridge line after exclusion by the exclusion means until reaching a terminal ridge line that does not exist adjacent to one end point; and
Of the ridge line groups extracted by the candidate ridge line group extracting means, the most ridge line group extracting means for extracting the ridge line group having the largest number of ridge lines belonging to the candidate ridge line group extracting means;
When there are different ridge line groups having a common ridge line among the ridge line groups extracted by the candidate ridge line group extracting means, the angle formed between the ridge line branched from the common ridge line and the ridge line of the branch source is the largest. A maximum angle ridge line group extracting means for extracting a ridge line group including an ridge line to be an angle;
When one ridge line group is extracted by any one of the candidate ridge line group extracting means, the most frequent ridge line group extracting means, and the maximum angle ridge line group extracting means, the ridge lines belonging to the extracted ridge line group An assigning means for assigning the same R attribute value as the R attribute value of the given ridge line,
Attribute value giving program for causing a computer to function as a computer.

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