JP2001325304A - Data converting method and recording medium with recorded data converting program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a data converting method which actualizes the reduction of the throughput (labor) regarding the generation of figures on the whole design system and actualizes interference check processing, rendering processing, and line elimination among different kinds of incompatible CAD. SOLUTION: This data converting method includes a data conversion processing step of a type A which converts 3D solid figure data 1 generated by AutoCAD (trademark) into data in polygon form with thickness properties representable on Intergraph(trademark)-PDS while maintaining its characteristics and a data conversion processing step of a type B which converts the 3D solid figure data 1 into data in 'polyline + polyface mesh' form representable on Intergraph-PDS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data conversion method for realizing data conversion between different types of incompatible CAD, and more particularly, to AutoCAD (AutoDead, USA).
Data conversion method for automatically converting 3D solid graphic data generated on sk's general-purpose CAD) into a format that can realize an interference check function and a rendering function by Intergraph_PDS (CAD for Intergraph's plant in the United States), and the data The present invention relates to a recording medium on which a conversion program is recorded.

[0002]

2. Description of the Related Art A conventional data conversion method will be described below. In a conventional design system, an optimal CAD tool is selected for each subsystem depending on its purpose and application. As a result, for example, for a plant design system,
D, Intergraph_PDS, was adopted as a core CAD, and for a boiler design system, AutoCAD, a general-purpose CAD, was adopted as a core CAD. Therefore, when expressing the same figure in both CADs, it is necessary to individually create the same figure.

[0003] Data formats that can be handled are different between these CAD systems.
In AD, the ACI used in many solid modelers
S (Spatial Technology's solid modeling
"Kernel) -based data format" 3D solid model "is used. In Intergraph_PDS,
"Surface model" which is a data format based on a unique format is used. Therefore, Au
The 3D solid figure data output by toCAD is converted to Intergraph_PDS while maintaining the original characteristics.
It was impossible to take in.

[0004] More specifically, 3D solid figure data generated by AutoCAD is converted to, for example, AutoCA.
DWG, DXF, IGE, which are intermediate formats available for both D and Intergraph_PDS
The data in this state is converted / outputted to a format such as S.
If ergraph_PDS is used, Inter
On the graph_PDS side, the received data is
It is expressed not as a solid figure but as a wire frame figure (see FIG. 18).

[0005] As described above, in the prior art, a figure is separately created by both CADs, or both CAs are used.
The user has to work on each subsystem by using the mutual data using an intermediate format that can be used in D (cannot maintain the original characteristics), or selecting one of them.

[0006]

SUMMARY OF THE INVENTION However,
In the prior art, both CADs (AutoCAD, I
(graph_PDS), three-dimensional models are created individually on both CAD systems for the same design object, and work efficiency is reduced because of double work. There was a problem that it was bad.

In the prior art, when mutual data is used using an intermediate format that can be used in both CAD systems, the original characteristics of 3D solid graphic data generated on AutoCAD cannot be maintained. There is a problem that the interference check function and the rendering function cannot be realized on the Intergraph_PDS side.

More specifically, for example, "Inter
3D data (piping, steel frame, cable tray, other equipment, etc.) created on graph_PDS, and Auto
I would like to perform interference check processing, rendering processing, and hidden line processing on Intergraph_PDS using 3D solid figure data created on oCAD. "
AutoCAD and Inter
MicroSt which is the backbone CAD of graph_PDS
ation (Bentley's general-purpose CAD)
There is a problem that there is no compatibility with respect to phase (Topology) information which is indispensable for processing, and the above-described processing cannot be realized.

The present invention has been made in view of the above, and has been made in consideration of AutoCAD and Intergraph_PDS.
In the entire design system, including the design, it is possible to reduce the processing amount (labor) related to the creation of figures, and realize the interference check processing, rendering processing, and hidden line processing while maintaining the original characteristics created by each CAD. It is an object to obtain a data conversion method and a recording medium on which a data conversion program is recorded.

[0010]

Means for Solving the Problems To solve the above-mentioned problems,
In order to achieve the object, in a data conversion method according to the present invention, 3D solid graphic data created by AutoCAD is converted to an inter-form data while maintaining its characteristics.
a type A data conversion processing step of converting the data into polygon format data with a thickness attribute that can be expressed on graph_PDS, and converting the 3D solid graphic data into the Int
ergraph_PDS (Polyline +
A type B data conversion processing step of converting the data into data in the form of a polyface mesh.

According to the present invention, individual figures are created by converting 3D solid figure data created on AutoCAD into a data format usable on Intergraph_PDS while maintaining the original characteristics. Without, for example, Intergraph_P
A DS interference check function, a rendering function, and a hidden line processing function are realized.

In the data conversion method according to the next invention, in the type A data conversion processing step, the 3D solid graphic data is converted into a single "parallel sweep".
A first generation step of calculating a distance between an upper base and a lower base as the thickness attribute when the shape is a shape, and thereafter generating the data in the polygon format with the thickness attribute;
When the D solid figure data is a combination of a plurality of “parallel sweep” shapes, the 3D solid figure data is
"Parallel sweep" shape, and cut so that the volume is the maximum, in the shape unit after cutting, calculate the distance between the upper bottom and the lower base as the thickness attribute, then, the thickness attribute A second generating step of generating data in the form of a polygon with attached data, and when the 3D solid figure data is other than a combination of a single “parallel sweep” shape and a plurality of “parallel sweep” shapes, approximate data And a third generation step of generating the data in the polygon format with the thickness attribute using a conversion method.

According to the present invention, when converting 3D solid graphic data created by AutoCAD into "polygon with thickness attribute", the 3D solid graphic data is first converted in the first generation step. It is determined whether the data is possible, and if the data has a single “parallel sweep” shape, a first generation step is executed, and the generation result is output. On the other hand, if it is not a single “parallel sweep” shape, it is next determined whether or not the data can be converted in the second generation step. For example, if the data is a combination of a plurality of “parallel sweep” shapes, The second generation step is executed, and the generation result is output. Finally, if the 3D solid graphic data has a shape other than a combination of a single “parallel sweep” shape and a plurality of “parallel sweep” shapes, the third generation step is executed unconditionally, The result of the generation is output.

In the data conversion method according to the next invention, the type B data conversion processing step includes a polygon conversion processing step of performing a polygon conversion processing on all planes in the 3D solid graphic data. A polyface meshing step of performing a polyface meshing process on all the curved surfaces in the 3D solid graphic data.

According to the present invention, the 3D solid graphic data created by AutoCAD is converted to "(POLYLINE +
PolyFaceMesh) ”, all the planes and surfaces that make up the original solid are obtained by decomposing the received 3D solid figure data in a simulated manner. A "polygonization process" is performed, and a "polyface meshing process" is performed on all the curved surfaces, and the processing results are output as data conversion results.

In a recording medium on which a data conversion program according to the next invention is recorded, 3D solid graphic data created by AutoCAD is provided with a thickness attribute that can be expressed on Intergraph_PDS while maintaining its characteristics. Type A to convert to polygon format data
A data conversion processing step of converting the 3D solid graphic data into data of a (polyline + polyface mesh) format that can be expressed on the Intergraph_PDS;
Is characterized by including

According to the present invention, individual figures are created by converting 3D solid figure data created on AutoCAD into a data format usable on Intergraph_PDS while maintaining the original characteristics. Without, for example, Intergraph_P
A DS interference check function, a rendering function, and a hidden line processing function are realized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the data conversion method according to the present invention will be described below in detail with reference to the drawings.
The present invention is not limited by the embodiment.

FIG. 1 is a flowchart showing an overall flow of a data conversion method according to the present invention, and FIG. 2 is a diagram showing a flow of data converted / output by using the data conversion method according to the present invention. is there. In the present embodiment,
For example, 3D solid figure data 1 created on AutoCAD is converted into a desired data format by a data conversion program 2 resident in AutoCAD, and the converted data (interference check data 3, shape display data 3) 4) is output to the outside. Also, Inte
On the rgraph_PDS side, the received interference check data 3 is treated as “interference check model 5” for Intergraph_PDS, an interference check function is realized, and the other shape display data 4 is Interg.
It is treated as a “shape display model 6” for raph_PDS, and implements a rendering function and a hidden line processing function.

At this time, the data conversion program 2 acquires an environment initialization variable (see FIG. 3) at the same time when AutoCAD is started, and resides in the environment initialization variable (FIG. 1, step S1). In accordance with the input of (start) (step S2), a data conversion process for interference check (step S3) and a data conversion process for shape display (step S4) to be described later are performed. In addition, the data conversion program 2 is ended in accordance with the end of each process and the end of the system itself (step S2).

In the present embodiment, the interference check model 5 is a model for transmitting the phase of the 3D solid figure data 1 on the AutoCAD (information that "the solid is packed"). For a complicated shape such as a curved surface, a minute step is generated. Further, the shape display model 6 is a model for the purpose of creating a perspective view of the model appearance, and a plan view and a side view, and more accurately expresses the appearance shape of the 3D solid graphic data 1 on AutoCAD. Further, the environment initialization variables shown in FIG. 3 are not limited to this, and all the operation environments relating to the above processing can be set.

As described above, in the present embodiment, A
3D solid graphic data created on utoCAD, while maintaining the original characteristics,
The data is converted into a data format usable on h_PDS, and the following functions are realized. (1) A three-dimensional design work is supported by realizing an interference check function. (2) A bird's-eye view (perspective) and an accurate external view for customer explanation are created by realizing the rendering function and the hidden line processing function.

FIG. 4 is a diagram showing a specific system configuration for realizing the interference check function. In FIG. 4, reference numeral 11 denotes a computer on which AutoCAD is installed, reference numeral 12 denotes a computer on which Intergraph_PDS is installed, and reference numeral 13 denotes Intergraph.
MicroS that operates as the core CAD of ph_PDS
Reference numeral 14 denotes a storage unit for storing interference check information.

For example, 3D solid figure data 1 created by the computer 11 (corresponding to 3DSOLID shown)
Is the data for interference check 3 (POLYLINE
+ thickness: Polygon with thickness attribute "Closed 2D polyline with thickness attribute added") is output. The MicroStation 13 on the computer 12 that has received the interference check data 3 creates an interference check model 5 (SOLID: solid) that can be registered as an interference check target based on the data. In this state, the computer 12 implements the interference check function using the received interference check model 5 and the interference check information stored in the storage unit 14.

FIG. 5 is a diagram showing a specific system configuration for realizing the rendering function and the hidden line processing function. In addition, about the same structure as FIG. 5 mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

For example, 3D solid figure data 1 created by the computer 11 (corresponding to 3DSOLID shown)
Is processed by the data conversion program 2 which is resident at the same time as the system startup, and the data for shape display 4 (POLYLINE + P
olyFaceMesh: converted to a plane + curved surface) and output.
The MicroStation 13 on the computer 12 that has received the shape display data 4 creates a shape display model 6 (SHAPE: shape) that can be processed as a rendering target based on the data. In this state, the computer 12 implements a rendering function using the received shape display model 6, and further implements a hidden line processing function (edge processing) using the shape display model 6.

Hereinafter, data conversion processing for interference check by the above-described data conversion program 2 (step S
3) and data conversion processing for shape display (step S
4), will be described in detail. First, the data conversion processing for interference check will be described.

FIG. 6 shows a data conversion program 2 for converting 3D solid graphic data 1 into interference check data 3.
It is a flowchart of FIG. First, in the data conversion program 2, all 3D images created by AutoCAD are created.
The solid figure data (3D solid) is searched (step S11), and all the searched 3D solids are searched through the repetitive processing.
The solid figure data is converted into interference check data 3, that is, "polygon with thickness attribute" (step S).
12, step S13).

In the present embodiment, step S12
First, as a data conversion process corresponding to
It is determined whether the 3D solid graphic data 1 searched in 1 is data that can be converted to level_1 described later (step S14), and if the data satisfies a specific criterion defined for executing the level_1 conversion. , Level_1 conversion (step S15, Yes), and outputs the result. On the other hand, if the specific criterion is not satisfied, the process proceeds to step S16 without performing the level_1 conversion (No in step S15).

Next, in the data conversion program 2, it is determined whether the 3D solid graphic data 1 for which the level_1 conversion has not been performed is data which can be converted to the level_2 (step S16), and the level_2 conversion is executed. Level_ if you meet the specific criteria specified for
2 conversion is performed (step S17, Yes), and the result is output. On the other hand, if the predetermined criterion is not satisfied, the level_2 conversion is not performed (step S17, N
o), the process proceeds to step S18.

Finally, the data conversion program 2 unconditionally performs level-3 conversion on the 3D solid graphic data 1 for which level-2 conversion has not been performed (step S18). The level_3 conversion is an approximate data conversion method.
Even D solid figure data can be converted to interference check data 3.

Here, the shape that can be converted at each level is
This will be described using a specific example. For example, FIG.
FIG. 7 is a diagram showing the shape of 3D solid graphic data 1 that can be converted into 1 and the shape of interference check data 3 after level_1 conversion. FIG. 8 is a diagram showing the shape of the 3D solid graphic data 1 in which level_1 conversion is not possible and level_2 conversion is possible, and the shape of the interference check data 3 after level_2 conversion. FIG. 9 is a diagram showing the shape of the 3D solid graphic data 1 for which level_1 conversion and level_2 conversion are not possible, and the shape of the interference check data 3 after level_3 conversion.

In the present embodiment, as shown in FIG. 7, when the shape of the 3D solid graphic data 1 is a PDS primitive shape, the above-described specific reference defined for executing the level_1 conversion is performed. Will be satisfied. That is, only the 3D solid graphic data 1 having the PDS primitive shape can perform the level_1 conversion. For example, shapes such as cuboids, prisms, and steel shapes are applied to this process. Here, the PDS primitive refers to a three-dimensional figure formed by vertically extruding a two-dimensional planar polygon (polygon), that is, a figure in a “parallel sweep” shape.

As shown in FIG. 8, when the shape of the 3D solid graphic data 1 is a shape (including a single shape) obtained by combining the PDS primitive shapes three-dimensionally, the above-described “level_2 conversion is executed. To meet the specified criteria ". That is, the level_2 conversion can be performed on the 3D solid graphic data 1 having a three-dimensionally combined PDS primitive shape or a single PDS primitive shape. For example, in the field of plant design, the shape of a normal (except irregular) duct or the like is applied to this process.

In the present embodiment, as shown in FIG. 9, the shape of the 3D solid graphic data 1 is PDS
When the primitive shape is not a shape (including a single shape) that is three-dimensionally combined, the level_3 conversion is performed. For example, in the field of plant design, the shape of a duct transition portion or the like is applied to this processing. However, the level_3 conversion can be performed even if the shape of the 3D solid graphic data 1 is a single PDS primitive shape or a shape in which the PDS primitive shapes are three-dimensionally combined. 9A shows a perspective view of the figure before and after the change, FIG. 9B shows a side view, and FIG. 9C shows an enlarged view of a part of the side view.

FIGS. 10 and 11 show the “level_1 conversion process (step S1) in the flowchart shown in FIG.
4) is a flowchart illustrating the details of “4)”. For example,
As shown in FIG. 10A, in step S14 of the data conversion program 2, it is determined whether or not the 3D solid graphic data 1 searched in step S6 is data capable of level_1 conversion, that is, PDS. It is determined whether it is a primitive shape (step S21).
Then, only in the case of the PDS primitive shape (step S22, Yes), the level_1 conversion is performed, and the 3D solid figure data 1 is converted into the interference check data 3 (step S23). On the other hand, if it is not the PDS primitive shape (step S22,
No), the level_1 conversion is not performed.

FIG. 10B is a flowchart showing the details of the "determination process as to whether or not it is a PDS primitive shape (step S21)". For example, 3
When it is determined whether or not the D solid figure data 1 is a PDS primitive shape, step S2 in FIG.
In step 1, first, the 3D solid graphic data 1 is simulatedly decomposed (step S24), and thereafter, it is determined whether or not the decomposed surface (region) configuration satisfies the condition of the “parallel sweep” shape (step S25). .

More specifically, the normal vector of a specific surface and the normal vector of another surface are compared in order (FIG. 11, step S41), and the stage when the comparison with the last surface is completed is completed. For example, if not parallel (step S45,
No), and there is at least one normal vector that is not vertical (No in step S46) (step S4)
(2, Yes), a similar comparison process is performed on the next specific surface (step S41). On the other hand, for example, when the comparison between the normal vector of a specific surface and the normal vector of the last surface is completed, the parallel normal vector (Step S45, Yes) or the vertical normal vector (Step S45, Yes) If only the step S46, Yes) exists (step S42, No), it is determined that the 3D solid figure data 1 may satisfy the condition of the “parallel sweep” shape. The comparison of the surfaces is performed (step S43).

In step S43, a specific surface and another surface are sequentially compared, and when the comparison with the last surface is completed, for example, the surfaces are parallel (step S47, Yes) and not the same surface (step S48, step S48). If the number of faces is two (Yes in step S44), the 3D
It is determined that the solid graphic data 1 satisfies the condition of the “parallel sweep” shape. Then, one of the two surfaces is defined as an upper base and the other as a lower base, and a distance between the upper and lower bases is calculated (step S49).

FIG. 10C is a flowchart showing the details of the "processing for converting 3D solid graphic data 1 into interference check data 3 (step S23)".
In step S23, the 3D solid graphic data 1 determined to have the PDS primitive shape (step S22, Yes) is simulatedly decomposed (step S27), and a surface having the extrusion direction as a normal line is searched (step S28). ,
Yes), a polygon with a thickness attribute is created from the surface (base surface) (step S29).

More specifically, since the base plane may be composed of a plurality of loops, the number of loops constituting the base plane is obtained (step S31), and then the polygons corresponding to the number of loops are obtained. (Step S32), the same extrusion distance as the original “parallel sweep” shape is added to the newly created polygon as a thickness attribute (Step S32).
33). After the creation of the polygon with the thickness attribute, the original 3D solid graphic data 1 to be converted is deleted (step S30).

FIGS. 12 and 13 show the “level_2 conversion process (step S1) in the flowchart shown in FIG.
6) is a flowchart illustrating the details of “6)”. For example,
As shown in FIG. 12, in step S16 of the data conversion program 2, first, all the cuttable planes in the received 3D solid graphic data 1 are calculated (step S51).

More specifically, in step 51, first, all vertices in the received 3D solid graphic data 1 are obtained (step S62).
The normal vectors of all the surfaces constituting the 3D solid graphic data 1 are obtained (step S63). Then, it is determined whether or not the received 3D solid graphic data 1 can be cut on a plane defined by a combination of the obtained vertices and the normal vector (step S64). The process proceeds to the determination process for the next surface, while if it can be cut (step S6).
5, Yes), and adds that surface to the array (step S6)
6) The processing shifts to the determination processing for the next plane, and this processing is repeated for all combinations of planes.

After calculating the cutting plane in step S51,
The data conversion program 2 determines whether or not the result of one cut is a “parallel sweep” shape, that is, whether or not the result is a PDS primitive shape (step S).
52).

More specifically, in step S52, the virtual 3D solid graphic data is simulated by the previously added plane, and it is determined whether the shape after cutting is a PDS primitive shape. (Step S71 in FIG. 13A). Therefore, in step S71, first, virtual 3D solid figure data (clone) for performing simulation such as cutting of the received 3D solid is created (step S72), and step S66 is performed.
Using the plane added earlier, the virtual 3
The D solid figure data is cut (step S73).
Then, in a process similar to steps S21 and S22 in FIG. 10, it is determined whether or not the shape after cutting is a PDS primitive shape (step S74). If the shape is not a PDS primitive shape (No in step S75), the created virtual The 3D solid graphic data is deleted (step S77), and the same processing is performed for the next plane added earlier. On the other hand, if the shape after cutting is a PDS primitive shape (Step S75, Yes), the data conversion program 2 calculates the volume of the shape after cutting (Step S76), and then creates the created virtual 3D solid figure. The data is deleted (step S77), and the same processing is performed for all the added planes.

After the determination processing in step S52, the data conversion program 2 further checks whether the result of the two cuts is a "parallel sweep" shape, that is, the PDS.
It is determined whether it is a primitive shape (step S53).

More specifically, in step S53, the virtual 3D solid graphic data is pseudo-cut on the two planes added earlier, and the cut shape becomes P
It is determined whether the shape is a DS primitive shape (FIG. 13)
(B) Step S81). Therefore, in step S81, first, virtual 3D solid figure data is created from the information on the vertices and the normal vectors obtained earlier (step S82), and added in step S66. Using the combination of the two planes, the virtual 3D solid figure data is cut (step S8).
3, S84). Then, step S21 in FIG.
It is determined whether the shape after cutting is a PDS primitive shape by the same processing as in S22 and S22 (step S85).
If it is not a PDS primitive shape (step S86,
No), the created virtual 3D solid graphic data is deleted (step S88), and one of the planes is changed, and the same processing is performed. On the other hand, if the shape after cutting is a PDS primitive shape (step S86, Yes),
In the data conversion program 2, the volume of the shape after cutting is calculated (step S87), and then the created virtual 3
The D solid graphic data is deleted (step S88), and the same processing is repeated for all combinations.

Thereafter, in the data conversion program 2, if it is determined that the shape is not a PDS primitive shape in any of the determination processes in steps S52 and S53 (step S54, Yes), the received 3D solid graphic data 1 is processed. It is determined that the “level_2 conversion process” cannot be executed (that is, it is determined that the specific criterion is not satisfied), and the 3D solid graphic data 1 is
The processing is passed to the next “level — 3 conversion processing”.

On the other hand, if it is determined in step S52 and / or S53 that the object has the PDS primitive shape (step S5).
4, No), it is determined that the “level_2 conversion process” can be performed on the received 3D solid graphic data 1, and the 3D solid graphic data is obtained at the optimum cross section (step S 53) where the volume of the PDS primitive shape is maximized. 1 (step S56, or steps S57 and S5).
8).

When it is determined that “level_2 conversion processing” can be performed on the received 3D solid graphic data 1,
The same processing as in FIG. 10A is performed, and finally a polygon with a thickness attribute is created (steps S59, S60, S60).
61).

FIG. 14 is a flowchart showing details of the “level_3 conversion process (step S18)” in the flowchart shown in FIG. Data conversion program 2
In step S18, first, the received 3D solid figure data 1 is decomposed into a stack of minute "parallel sweep" shapes to perform approximate data conversion.

More specifically, first, the data conversion program 2 searches for all edges of the received 3D solid graphic data 1 (step S91), and furthermore, roughly searches for the existence of the 3D solid graphic data 1. A coordinate range (hereinafter, referred to as a bounding box) is calculated (step S92).

After calculating the bounding box, the data conversion program 2 determines whether a section of the 3D solid graphic data 1 can be created by scanning the inside of the bounding box (step S93). That is, the scanning plane is determined from the beginning to the end of the bounding box while proceeding in the designated small increment unit, and it is searched whether this scanning plane crosses the edge of the 3D solid graphic data 1 (step S100). , S101).

If it is determined that a cross section of the 3D solid graphic data 1 can be created from the scanning plane (step S
94, Yes), a virtual cross section, that is, a shape of the cut surface is created (step S95). Then, the shape is compared with the shape of the adjacent front section (step S96), and if the shapes are the same (step S97, Yes), it is determined that the combination of the previous shape and the current shape is the “parallel sweep” shape. Then, the scanning plane is shifted in small increments, and the shape of the next cut surface is created again by the same processing.

On the other hand, if the result of comparison with the shape of the adjacent front section is different (No in step S97), a solid in the small increment unit, that is, a polygon with a thickness attribute in the small increment unit is created (step S98). More specifically, a polygon with a thickness attribute is created by the same processing as step S29 in FIG. 10C (steps S102, S103, S103).
104). The processing of steps S91 to S98 is
Repeatedly executed in small increments, 3 received
A polygon with a thickness attribute corresponding to the D solid figure data 1 is created, and finally, the original 3D solid figure data 1 is deleted (step S99).

As described above, in the present embodiment, A
When converting 3D solid graphic data created by autoCAD into interference check data 3, that is, "polygon with thickness attribute", first, is the 3D solid graphic data 1 data that can be converted to level_1? It is determined whether the level_1 conversion is performed and the result of the conversion is output if a specific criterion for performing the level_1 conversion is satisfied. On the other hand, if the specific criterion is not satisfied, it is next determined whether or not the data is level_2 convertible. If the specific criterion for performing the level_2 conversion is satisfied, the level_2 conversion is performed. And if the predetermined criterion is not satisfied, level_3 conversion is executed unconditionally, and one of the conversion results is output.

Thus, in the present embodiment, A
AutoCAD and Intergraph_PDS do not need to create individual figures, so AutoCA
In the entire design system including D and Intergraph_PDS, it is possible to reduce the processing amount (labor) related to the creation of graphics, and to maintain the characteristics of 3D solid graphics data generated on AutoCAD. , Intergraph_PDS, it is possible to realize an interference check function. In addition, since the data conversion process can be performed in stages from level 1 to 2 to 3, the amount of arithmetic processing can be reduced.

Next, the data conversion processing for shape display will be described. FIG. 15 shows a data conversion program 2 for converting 3D solid graphic data 1 into shape display data 4.
It is a flowchart of FIG. First, in the data conversion program 2, all 3D images created by AutoCAD are created.
The solid figure data is searched (step S111), and all the 3D solid figure data searched in the iterative process are replaced with the shape display data 4, ie, "(POLYLINE
+ PolyFaceMesh: plane + curved surface) ”(steps S112 and S113).

In the present embodiment, step 112
First, as a data conversion process corresponding to
By pseudo-decomposing the D solid figure data, all the surfaces (planes and curved surfaces) of the shape constituting the original solid are acquired (step S114). Here, the plane is called a “region” and the curved surface is called a “body”.

Thereafter, in the data conversion program 2, a polygon formation process described later is performed on all regions (polygon planes) (step S115), and a polyface mesh described later is performed on all bodies. By performing the conversion process (step S116),
The received 3D solid graphic data is converted into shape display data 4 and, finally, the original 3D solid graphic data is deleted from the program (step S117).

FIGS. 16A and 16B show the “polygonizing process (step S115)” and “polyface meshing process (step S11) shown in FIG. 15, respectively.
6) is a flowchart illustrating the details of “6)”. FIG.
In (a), in step S115, first, a clone is created from the region previously acquired in step S114 (step S121), and a polygon with a thickness attribute is created from the surface (step S122).

More specifically, since a region may be composed of a plurality of loops, the number of loops constituting the region is obtained (step S124), and then the polygons having the thickness attribute corresponding to the number of loops are obtained. Is created (step S125). After the creation of the polygon with the thickness attribute, the original 3D solid graphic data 1 to be converted is deleted from the program (step S123).

In FIG. 16B, step S
In step 116, first, a clone is created from the body obtained in step S114 (step S13).
1) It is determined whether or not the body has a perfect cylindrical shape (step S132). In step S132, for example, the surface type is acquired (step S137). If the surface type is cylindrical (S138, cylinder), a circular edge of the surface is acquired from the cylindrical body (step S139). It is determined whether the column is a perfect cylinder (step S140). If the body is a perfect cylinder (step S14)
0, Yes), and create a “circle with thickness attribute” (step S)
133, S134), and then delete the clone from the program (step S136).

On the other hand, if the surface type is acquired (step S137), and the surface type is not a cylinder (S138, other than a cylinder), or if the body is not a perfect cylinder (step S140, No), A body object is searched for and a “polyface mesh” is created (step S135). That is,
By acquiring a series of passing points on the body (step S14
1) Create a "polyface mesh" (step S142), and then delete the clone from the program (step S136).

As described above, in the present embodiment, A
The 3D solid figure data created by autoCAD is converted into shape display data 4, ie, "(POLYLINE + P
olyFaceMesh: plane + curved surface) "
By pseudo-decomposing the received 3D solid figure data, all the regions and bodies that make up the original solid are acquired, all regions are subjected to “polygon processing”, and all the bodies are processed. , A "polyface meshing process" is performed, and the results of these processes are output as data conversion results.

Thus, in the present embodiment, A
Since it is not necessary to create a figure separately in autoCAD and Intergraph_PDS, it is possible to reduce the processing amount (labor) related to the creation of a figure in the entire motor integrated system, and furthermore, AutoCA
Since the characteristics of the 3D solid figure data generated on D can be maintained, Intergraph_PDS
It is possible to realize the rendering function and the hidden line processing function on the side.

FIG. 17 is a diagram showing the configuration of a general computer system that operates as AutoCAD shown in the first embodiment and is capable of executing the data conversion program 2 described above. In this computer system, for example, a “data conversion program 2” that implements the data conversion methods shown in FIGS. 6 and 10 to 16 is executed.

The computer system includes a control unit 301 including a CPU, a memory unit 302, a display unit 303, an input unit 304, a CD-ROM drive unit 305, a disk unit 306,
These units are connected via a system bus A, respectively. In FIG. 17, the control unit 301 executes the data conversion program. The memory unit 302 includes a memory such as a RAM and a ROM, and stores programs to be executed by the control unit 301, necessary data obtained in the course of processing, and the like.
The display unit 303 includes a CRT, an LCD (liquid crystal display panel), and the like.
Display various screens. The input unit 304 includes a keyboard, a mouse, and the like.
Used to enter various information. The data conversion program 2 shown in FIG. 6 and FIGS. 10 to 16 is stored in the illustrated CD-ROM 200.

In the computer system configured as described above, first, the data conversion program 2 is installed in the disk unit 306 from the CD-ROM 200 set in the CD-ROM drive unit 305. Then, the data conversion program 2 read from the disk unit 306 when starting up the computer system
Are stored in the memory unit 302. In this state,
The control unit 301 (CPU)
2 and the processing shown in FIGS. 6 to 10 are executed in accordance with the data conversion program stored in FIG.

In the present invention, the CD-ROM 2
00, a program describing the above processing is provided. However, the storage medium of the program is not limited to this, and may be, for example, a floppy (registered trademark) disk or the like depending on the computer constituting the system. Other storage media such as magnetic disks, magneto-optical disks, and magnetic tapes can be used.

[0071]

As described above, according to the present invention, since it is not necessary to individually create a figure on a CAD having no data compatibility, AutoCAD and Interg are not required.
In the entire design system including the graph_PDS, an effect is obtained that the processing amount (labor) related to the creation of a graphic can be significantly reduced. Also, AutoCAD
Data conversion becomes possible while maintaining the original characteristics of the 3D solid graphic data created in
An effect that interference check processing, rendering processing, and hidden line processing can be realized on the graph_PDS can be achieved.

According to the next invention, since it is not necessary to create a figure separately in AutoCAD and Intergraph_PDS, AutoCAD and Intergraph_PDS are not required.
In the entire design system including the graph_PDS, it is possible to reduce the processing amount (labor) related to the creation of a graphic, and further, it is possible to perform the data conversion process stepwise, so that the calculation processing amount can be reduced. This has the effect.

According to the next invention, since there is no need to create a figure separately in AutoCAD and Intergraph_PDS, AutoCAD and Intergraph_PDS are not required.
In the entire design system including the graph_PDS, it is possible to reduce the processing amount (labor) related to the creation of a figure, and further, to create data separately for a plane and a curved surface, a rendering function and a hidden line processing function on the Intergraph_PDS side Is achieved.

According to the next invention, according to the invention of the first aspect (the present invention), since it is not necessary to individually create a figure on a CAD having no data compatibility, the entire design system including AutoCAD and Intergraph_PDS , It is possible to obtain a program capable of greatly reducing the processing amount (labor) related to the creation of a figure.
This has the effect. Also, while maintaining the original characteristics of the 3D solid graphic data created by AutoCAD,
Since data conversion is possible, Intergraph_
There is an effect that a program capable of realizing the interference check processing, the rendering processing, and the hidden line processing can be obtained on the PDS.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an overall flow of a data conversion method according to the present invention.

FIG. 2 shows a conversion / data conversion using the data conversion method according to the present invention.
It is a figure showing the flow of the outputted data.

FIG. 3 is a diagram illustrating an example of an environment initialization variable.

FIG. 4 is a diagram showing a specific system configuration for realizing an interference check function.

FIG. 5 is a diagram showing a specific system configuration for realizing a rendering function and a hidden line processing function.

FIG. 6 is a flowchart of a data conversion program 2 for converting 3D solid graphic data 1 into interference check data 3;

FIG. 7 is a diagram showing a shape of 3D solid graphic data 1 capable of level_1 conversion and a shape of interference check data 3 after level_1 conversion.

FIG. 8 is a diagram showing the shape of 3D solid graphic data 1 in which level_1 conversion is not possible and level_2 conversion is possible, and the shape of interference check data 3 after level_2 conversion.

FIG. 9 is a diagram showing the shape of 3D solid graphic data 1 for which level_1 conversion and level_2 conversion are not possible, and the shape of interference check data 3 after level_3 conversion.

FIG. 10 is a flowchart showing details of “level_1 conversion processing (step S14)” shown in FIG. 6;

FIG. 11 is a flowchart showing details of “level_1 conversion processing (step S14)” shown in FIG. 6;

FIG. 12 is a flowchart showing details of “level_2 conversion processing (step S16)” shown in FIG. 6;

FIG. 13 is a flowchart showing details of “level_2 conversion processing (step S16)” shown in FIG. 6;

FIG. 14 is a flowchart showing details of “level — 3 conversion processing (step S18)” shown in FIG. 6;

FIG. 15 is a flowchart of a data conversion program 2 for converting 3D solid graphic data 1 into shape display data 4.

FIG. 16 shows a “polygon conversion process (step S
115) and “Polyface meshing process (step S116)”.

FIG. 17 is a diagram showing a configuration of a general computer system capable of executing a data conversion program 2.

FIG. 18 is a diagram showing a conventional data conversion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 3D solid figure data 2 Data conversion program 3 Interference check data 4 Shape display data 5 Interference check model 6, 6a Shape display model 11, 12 Computer 13 MicroStation 14 Storage unit

Claims (4)

[Claims] 1. A 3D solid graphic data created by AutoCAD is converted to an Inte
a type A data conversion processing step of converting the data into a polygon format data with a thickness attribute that can be expressed on rgraph_PDS;
a type B data conversion processing step of converting the data into data of a “polyline + polyface mesh” format that can be expressed on ph_PDS. 2. In the type A data conversion processing step, when the 3D solid graphic data has a single “parallel sweep” shape, the thickness attribute is set between the upper base and the lower base. Calculating a distance, and thereafter generating the data in the polygon format with the thickness attribute; and when the 3D solid graphic data is a combination of a plurality of “parallel sweep” shapes, the 3D solid graphic The data, `` parallel sweep '' shape, and cut so that the volume is the maximum, in the shape unit after cutting, calculate the distance between the upper bottom and the lower base becomes the thickness attribute, then, A second generation step of generating data in a polygon format with a thickness attribute, wherein the 3D solid graphic data is other than a combination of a single “parallel sweep” shape and a plurality of “parallel sweep” shapes The data conversion method according to claim 1, further comprising: a third generation step of generating the data in the polygon format with the thickness attribute using an approximate data conversion method. 3. The data conversion processing step of the type B includes: a polygon conversion processing step of performing a polygon conversion processing on all planes in the 3D solid graphic data; 3. The data conversion method according to claim 1, further comprising: a polyface meshing process step of performing a polyface meshing process on the curved surface. 4. Integrating 3D solid graphic data created by AutoCAD while maintaining its characteristics
a type A data conversion processing step of converting the data into a polygon format data with a thickness attribute that can be expressed on rgraph_PDS;
a computer-readable recording medium having recorded thereon a data conversion program, comprising: a type B data conversion processing step of converting the data into data of a “polyline + polyface mesh” format that can be expressed on ph_PDS.