JP7662162B2 - Three-dimensional CAD device and three-dimensional structure generating method - Google Patents

Description

The present invention relates to a three-dimensional CAD device and a three-dimensional structure generating method .

For example, at civil engineering construction sites where large structural frames and other structures are being constructed, contractors would proceed with construction while checking the shape and dimensions of the structure using multiple 2D drawings created by the designer with different perspectives.

However, if there is an inconsistency between multiple two -dimensional drawings and the inconsistency cannot be detected in advance, there is a risk that an inconvenient situation such as interruption of construction may occur.

Therefore, construction information modeling (CIM) is being introduced to improve the efficiency of the work. Even when CIM is introduced, a CAD operator operates a 3D CAD device to create a 3D model of a structure based on multiple 2D drawings created by a designer from different viewpoints. If an inconsistency is found between the multiple 2D drawings at that time, the designer corrects the inconsistent drawings, and the final 3D model is completed.

At civil engineering and construction sites, the site manager inspects the structure based on the 3D model displayed on a display device and multiple 2D drawings printed on paper, and construction work can proceed only after confirming that there are no problems.

In the verification work by the site manager, when checking the dimensions of each part of the 3D model displayed on the display device, it is necessary to select the corresponding drawing from multiple 2D drawings printed on paper and check the dimensions written on the 2D drawing, but this work is very cumbersome. Even when the 2D drawing is displayed on the display device, the cumbersome work of checking while comparing the 3D model and the 2D drawing is still required.

Patent Document 1 discloses an information processing device that includes a storage means for storing two-dimensional drawings that are generated from a three-dimensional model showing the three-dimensional shape of a design object and are composed of multiple projection views, and the coordinate values of each element that constitutes the three-dimensional model from which the two-dimensional drawings were generated.

The information processing device includes a first specification receiving means for receiving a specification of an element that serves as a reference for calculating a dimension in the depth direction in any projection view constituting the two-dimensional drawing stored in the storage means, a second specification receiving means for receiving a specification of an element for which a dimension in the depth direction is to be calculated in any projection view constituting the two-dimensional drawing stored in the storage means, a calculation means for performing a process to calculate a distance between the elements in a three-dimensional model that generates the two-dimensional drawing based on the elements specified by the first specification receiving means and the elements specified by the second specification receiving means, and a display means for performing a process to display the distance calculated in response to the process in the calculation means as the dimension in the depth direction of the element specified by the second specification receiving means.

JP 2014-44074 A

However, the information processing device disclosed in Patent Document 1 has a problem in that, in order to display dimensions in an arbitrary projection view of a three-dimensional model, it is necessary to perform an operation to specify each of the reference element and the element for which the dimension in the depth direction is calculated, making the operation to specify each element cumbersome. Also, in order to display dimensions in an arbitrary projection view, it is necessary to perform an operation to specify each of the reference element and the element for which the dimension from the reference is calculated, making the operation to specify each element similarly cumbersome.

In view of the above-mentioned problems in the conventional art, an object of the present invention is to provide a three-dimensional CAD device and a three-dimensional structure generating method that can grasp the dimensions of any projection drawing of a three-dimensional model without performing complicated operations.

In order to achieve the above object, a first characteristic configuration of a three-dimensional CAD device according to the present invention is a three -dimensional CAD device for generating a three-dimensional structure in a three-dimensional drawing space, comprising: a two-dimensional drawing input processing unit for importing into the three-dimensional CAD device a plurality of two-dimensional drawings, which are expressed from different viewpoints and on which dimension lines corresponding to the three-dimensional structure are drawn, into the three-dimensional CAD device; a scale matching processing unit for matching each scale of the two-dimensional drawings to a predetermined scale in the three-dimensional drawing space; a base point matching processing unit for translating the two-dimensional drawings so that an arbitrary base point included in the two-dimensional drawings matched to the predetermined scale is matched with a corresponding position in the three-dimensional drawing space; a viewpoint matching processing unit for rotating the two-dimensional drawings with the base points matched as necessary about a predetermined base line axis so that the viewpoint is matched with the three-dimensional drawing space; a first rendering processing unit that displays a plane of the two-dimensional drawing selected from the two-dimensional drawing and draws a plane figure that becomes a first object based on the dimension lines shown in the selected two-dimensional drawing; a second rendering processing unit that selects another two-dimensional drawing that intersects with the first reference plane, displays it on the screen as a second reference plane, and draws a three-dimensional figure that becomes a second object by giving height to the first object based on the dimension lines shown in the two-dimensional drawing ; a three-dimensional model generation processing unit that generates a three-dimensional model by repeatedly executing the first rendering processing unit and the second rendering processing unit for each two-dimensional drawing; and a display processing unit that displays the three-dimensional model generated by the three-dimensional model generation processing unit and viewed from any of the viewpoints, and displays the 2-D drawing corresponding to the viewpoint so as to be superimposed and facing the two-dimensional drawing, thereby allowing a user to check the consistency between the dimensions shown in the two-dimensional drawing and the three- dimensional model.

A two-dimensional drawing input processing unit imports a plurality of two-dimensional drawing files, on which dimension lines corresponding to a three-dimensional structure are drawn, into a three-dimensional CAD device to define two-dimensional drawings in a three-dimensional drawing space. A scale matching processing unit unifies the scales of the plurality of two-dimensional drawings, a base point matching processing unit translates the two-dimensional drawings in the three-dimensional drawing space so that any base point included in the plurality of two-dimensional drawings is matched with a corresponding position in the three-dimensional drawing space, and a viewpoint matching processing unit rotates the two-dimensional drawings corresponding to a predetermined base line as an axis so that the three-dimensional drawing space and the viewpoint are matched, thereby matching the relative positional relationship of the plurality of two-dimensional drawings in the three-dimensional drawing space with the base point as a reference.

Then, the three-dimensional model generation processing unit selects one of the two-dimensional drawings with the aligned viewpoints, displays it on the screen as a first reference plane, and draws a planar figure that will become the first object based on the dimension lines shown in the selected two-dimensional drawing by a first drawing processing unit, and selects another two-dimensional drawing that intersects with the first reference plane, displays it on the screen as a second reference plane, and draws a three-dimensional figure that will become the second object by adding height to the first object based on the dimension lines shown in the two-dimensional drawing by a second drawing processing unit.These processing steps are repeatedly performed for each two-dimensional drawing, and a three-dimensional model is generated extremely easily.
A three-dimensional model generated by a three-dimensional model generation processing unit and viewed from any viewpoint is displayed by a display processing unit, and a two-dimensional drawing corresponding to that viewpoint is superimposed and displayed facing directly, making it extremely easy to check the consistency between the dimensions shown on the two-dimensional drawing and the three-dimensional model.

The second characteristic feature of the present invention is that, in addition to the first characteristic feature described above, the three-dimensional model is a civil engineering structure.

By executing a three-dimensional model verification step at a civil engineering construction site, for example, the site manager can very easily and accurately grasp the civil engineering structure that is the subject of construction.

A characteristic configuration of the three-dimensional structure generating method according to the present invention is a three-dimensional structure generating method for generating a three-dimensional structure in a three-dimensional drawing space by a three-dimensional CAD device, comprising: a two-dimensional drawing input step executed by a two-dimensional drawing input processing unit for importing into the three-dimensional CAD device a plurality of two-dimensional drawings, which are expressed from different viewpoints and on which dimension lines corresponding to the three-dimensional structure are drawn; a scale matching step executed by a scale matching processing unit for matching each scale of the two-dimensional drawings to a predetermined scale in the three-dimensional drawing space; a base point matching step executed by a base point matching processing unit for translating the two-dimensional drawings so that an arbitrary base point included in the two-dimensional drawings matched to the predetermined scale is matched with a corresponding position in the three-dimensional drawing space; a viewpoint matching step executed by a viewpoint matching processing unit for rotating the two-dimensional drawing with the base point matched as necessary about a predetermined base line axis so that the viewpoint is matched with the three-dimensional drawing space; and a viewpoint matching step executed by a first drawing processing unit for selecting one of the two-dimensional drawings with the viewpoint matched and setting the selected one as a first reference plane. a first drawing step of displaying on a screen the two-dimensional drawing selected from the two-dimensional drawing, and drawing a plane figure which becomes a first object based on the dimension lines shown in the selected two-dimensional drawing; a second drawing step, executed by a second drawing processing unit, of selecting another two-dimensional drawing which intersects with the first reference plane, displaying it on the screen as a second reference plane, and drawing a three-dimensional figure which becomes a second object by giving height to the first object based on the dimension lines shown in the two-dimensional drawing; a three-dimensional model generation step of generating a three-dimensional model by repeatedly executing the first drawing step and the second drawing step for each of the two-dimensional drawings; and a consistency state confirmation step of displaying the three-dimensional model generated by the three-dimensional model generation step and viewed from any of the viewpoints, and displaying the 2-D drawing corresponding to the viewpoint so as to be directly opposed to the three-dimensional drawing, and confirming a consistency state between the dimensions shown in the two-dimensional drawing and the three-dimensional model, and a three-dimensional model verification step of repeating the consistency state confirmation step for the 3-D model viewed from each viewpoint.

As described above, according to the present invention, it is possible to provide a three-dimensional CAD device and a three-dimensional structure generating method that can grasp the dimensions of any projection drawing of a three-dimensional model without performing complicated operations.

FIG. 2A is an explanatory diagram of the hardware of the three-dimensional CAD device, and FIG. 2B is an explanatory diagram of the software of the three-dimensional CAD device. 1 is a flowchart showing a method of using the three-dimensional CAD device. 1A is an explanatory diagram of a plan view imported into a three-dimensional CAD device, FIG. 1B is an explanatory diagram of viewpoint matching processing for the front view and left side view of the same, and FIG. 1C is an explanatory diagram of three-dimensional drawing processing. 1A is an explanatory diagram of a state in which a three-dimensional model viewed from above obtained by a three-dimensional drawing process is superimposed on a plan view, and FIG. 1B is an explanatory diagram of a state in which a three-dimensional model viewed from the left side is superimposed on a left side view. 1A is an explanatory diagram of a front view inputted into a three-dimensional CAD device, and FIG. 1B is an explanatory diagram of a side view of the same. FIG. 2A is an explanatory diagram of a plan view inputted into a three-dimensional CAD device, and FIG. 2B is an explanatory diagram of a three-dimensional model drawn by the three-dimensional CAD device. 13A shows another embodiment, and is an explanatory diagram of a front view inputted into a three-dimensional CAD device, and FIG. 13B is an explanatory diagram of a side view of the same embodiment. 13A shows another embodiment, and is an explanatory diagram of a plan view inputted into a three-dimensional CAD device, and FIG. 13B is an explanatory diagram of a three-dimensional model drawn by the three-dimensional CAD device.

The three-dimensional CAD device and the three-dimensional structure generating method according to the present invention will be described below with reference to the drawings.
FIG. 1(a) shows the hardware configuration of a three-dimensional CAD device to which the present invention is applied, and FIG. 1(b) shows the software configuration of the three-dimensional CAD device.

In this embodiment, a tablet computer is used as the 3D CAD device. Note that the present invention is not limited to the use of tablet computers, and desktop computers and laptop computers can also be used.

As shown in FIG. 1(a), the 3D CAD device 1 is a device that generates a 3D model (hereinafter also referred to as a "3D model") of a 3D structure such as a civil engineering structure (railroad or road bridge, viaduct, tower-like structure, etc.) in a 3D drawing space, and is equipped with a CPU 3 communicably connected via a system bus 2, a memory 4 in which an OS program, application programs, etc. are stored, a touch panel type liquid crystal display unit 5, an input control unit 6 that executes input control for the touch panel type liquid crystal display unit 5, a display control unit 7 that executes output control for the touch panel type liquid crystal display unit 5, an I/F control unit 8 for connection with an external device, etc.

The input control unit 6 responds to various types of point designation operations using a stylus pen (tap, long press, double tap, drag, etc.) by selecting drawing objects and icons displayed on the screen and performing the required drawing processing (straight line drawing, curve drawing, rotation, movement, etc.).

The I/F control unit 8 includes a memory I/F control unit and a wireless communication I/F control unit, and for example, information can be input and output with a portable memory medium 9 via the memory I/F control unit, and information can be input and output with a cloud server 10, etc. via the wireless communication I/F control unit.

In the 3D CAD device 1, the following functional blocks are realized by the CPU 3 executing the 3D CAD program stored in the memory 4 under the control of the OS program. "Shapr3D" is preferably used as the 3D CAD program. However, it is also possible to use 3D CAD programs other than "Shapr3D".

As shown in FIG. 1(b), when the 3D CAD program is executed, the 3D CAD device 1 realizes functional blocks such as a 2D drawing input processing unit 21, a scale matching processing unit 22, a base point matching processing unit 23, a viewpoint matching processing unit 24, a drawing processing unit 25, a 3D model generation processing unit 26, a 3D drawing management unit 27, and a display processing unit 28.

The operation of each functional block will be explained below.
The two-dimensional drawing input processing unit 21 inputs a plurality of two-dimensional drawings, each of which is expressed from different viewpoints and shows a two-dimensional shape corresponding to a three-dimensional civil engineering structure (and the dimension lines of each part), and executes an import process in which the drawings are pasted onto each layer. The two-dimensional drawings are any drawing files, such as PDF files or JPEG files, designed in advance by a designer, and include a front view, a back view, a right side view, a left side view, a plan view, a bottom view, any cross-sectional view, and the like. Drawing files stored in advance in a memory stick or USB memory are read via the I/F control unit 8, or drawing files stored in advance in a cloud server are read via the I/F control unit 8.

The scale matching processing unit 22 executes a process for matching the scales of multiple 2D drawings loaded by the 2D drawing input processing unit 21. When multiple 2D drawings have different scales, the scale of each 2D drawing is changed so that the scales are matched in the 3D drawing space.

The base point matching processor 23 executes a process of translating the two-dimensional drawings in the three-dimensional drawing space so that any base point included in the two-dimensional drawings whose scales have been matched by the scale matching processor 22 is matched with a corresponding position in the three-dimensional drawing space. This causes the relative positional relationship in the three-dimensional drawing space between any base points included in each two-dimensional drawing to be matched.

The viewpoint alignment processing unit 24 rotates the two-dimensional drawings around a predetermined base line so that multiple two-dimensional drawings with different viewing directions are aligned in the three-dimensional drawing space. As the predetermined base line, a straight line that includes the base point selected by the base point alignment processing unit 23 and is parallel to one of the X, Y, or Z axes of the three-dimensional drawing space is selected. Through these processes, the relative positions of the multiple two-dimensional drawings are aligned with each other in the three-dimensional drawing space.

The drawing processing unit 25 executes a first drawing process in which one of the two-dimensional drawings is selected, displayed on the screen in two dimensions as a first reference plane, and a planar figure that becomes a first object is drawn based on the shape and dimension lines shown in the selected two-dimensional drawing, and a second drawing process in which another two-dimensional drawing that intersects with the first reference plane is selected, displayed in three-dimensional space as a second reference plane, and a three-dimensional figure that becomes a second object by adding height (depth) to the first object drawn in the first drawing process, based on the shape and dimension lines shown in the selected two-dimensional drawing.

For example, in the first drawing process, a drawing process is performed in which a drawing icon displayed on the screen is operated to connect points specified on the screen with straight lines or curves. In the second drawing process, a drawing process is performed in which the 2D object drawn in the first drawing process is selected and stretched in the height (depth) direction.

The 3D model generation processing unit 26 generates a three-dimensional model in a three-dimensional drawing space by repeatedly executing the first drawing process and the second drawing process executed by the drawing processing unit 25 for each two-dimensional drawing.

The 3D drawing management processing unit 27 associates information representing the three-dimensional model generated by the 3D model generation processing unit 26 with multiple two-dimensional drawings on which it is based, stores the information in the memory 4, and outputs the information to an external memory or server via the I/F control unit 8 as necessary.

The display processing unit 28 displays information related to the above-mentioned multiple processes on the screen, as well as icons that are commands required for operation.

A method of using the three-dimensional CAD device will be described below with reference to the flow chart shown in FIG.
When the 3D CAD device is powered on and the application is launched (S1), the operator inserts a USB memory storing a drawing file consisting of multiple PDF files into the I/F control unit 8, and imports the PDF files by touching the data read icon displayed on the screen with a stylus pen. The file format of each PDF file is converted so that it becomes a two-dimensional drawing (hereinafter also referred to as "2D drawing") that can be recognized and operated by the 3D CAD device, and the file is pasted onto each layer (S2, S3).

The operator selects the corresponding 2D drawing with the stylus pen and operates the magnification adjustment icon displayed on the screen so that the scale of each imported 2D drawing is consistent. This aligns the scale of each 2D drawing with the X, Y, Z coordinate system that defines the three-dimensional drawing space (S4). Note that the use of the stylus pen when operating the screen is the same as in the following explanation.

By operating the movement icon displayed on the screen, the operator drags and translates each 2D drawing so that any base point on the 2D drawing is at an appropriate position in the 3D drawing space. In more detail, corresponding points on the shapes depicted in each 2D drawing become base points, and each 2D drawing is translated so that each base point overlaps with a corresponding coordinate point in the coordinate system of the 3D drawing space (S5).

After aligning each base point, the operator aligns the viewpoints of the 3D drawing space and each 2D drawing by manipulating the icon displayed on the screen. Specifically, the operator aligns the viewpoints in the 3D drawing space by rotating the 2D drawing by a predetermined angle around a predetermined base line that includes the above-mentioned base point (S6).

The viewpoint matching process will be explained based on Figures 3(a) and (b). In Figure 3(a), 2D drawings F1, F2, and F3 attached to three layers L1, L2, and L3 are arranged on the XY plane in a three-dimensional drawing space, with a plan view F1 on layer L1, a front view F2 on layer L2, and a left side view F3 on layer L3.

The figure shows the state in which the above-mentioned base point matching process has been performed, with the common point of the shapes (objects) drawn in the plan view F1, front view F2, and left side view F3 as the base point BP. Note that the base point is not limited to the common point of each drawing, but can be any point on each drawing, and the arbitrary point can be translated (translated relative to the XY plane in this example) so that it becomes a corresponding point on the three-dimensional model formed in the three-dimensional drawing space.

As shown in FIG. 3(b), in the viewpoint matching process, the front view F2 is rotated -90° around the baseline BL1 (a line parallel to the X-axis) including the base point BP so that it is parallel to the XZ plane, resulting in a front view F2', and the left side view F3 is rotated 90° around the baseline BL2 (a line parallel to the Y-axis) including the base point BP so that it is parallel to the YZ plane, resulting in a left side view F3'.

Through these scale matching, base point matching, and viewpoint matching processes, each 2D drawing is correctly positioned in the 3D drawing space.

Next, as shown in FIG. 3(c), one of the two-dimensional drawings with the aligned viewpoints, in this example layer L3 with the left side view F3' attached, is selected and displayed on the screen as the first reference plane RP1 (S7), and a first drawing process is executed to draw a planar figure O1 (hatched figure in the drawing) that will be the first object based on the dimension lines d1 to d5 shown on the selected two-dimensional drawing (S8). Furthermore, another two-dimensional drawing that intersects with the first reference plane RP1, in this example layer L1 with the plan view F1 attached, is selected and displayed on the screen as the second reference plane RP2, and a second drawing process is executed to draw a solid figure O2 (figure shown by dashed line in the drawing) that will be the second object with height (depth) d6 added to the first object based on the dimension line d6 shown on the two-dimensional drawing (S7, S8).

The operator performs a 3D model generation process (S9) in which processes similar to the first and second drawing processes described above are repeatedly performed on each 2D drawing, and the final 3D model is generated and displayed (S10).

After generating the final 3D model, the 3D model viewed from one of the viewpoints is displayed, and the original 2D drawing corresponding to the selected viewpoint is superimposed and displayed facing the model, making it possible to perform a consistency check process to check the consistency between the dimensions shown on the 2D drawing and the 3D model.

If the 3D models obtained in this process overlap in parts of the 3D model space, it is easy to determine that the reference 2D drawings are not consistent. In this case, the designer is instructed to correct the original 2D drawings, and the same process is repeated after obtaining the correct 2D drawings. The final 3D model is determined by the 3D model verification process, which repeats such a consistency check process.

In the 3D model verification process, the viewing direction is set so that the finalized 3D model is displayed from the viewing direction corresponding to the 2D drawing previously imported, and the 2D drawing corresponding to the viewing direction is superimposed, making it possible to refer to the dimensions described in the 2D drawing and easily confirm the dimensions of each part of the 3D model. At this time, visibility can be improved by displaying either the 3D model or the 2D drawing semi-transparently.

Fig. 4(a) illustrates a three -dimensional model verification screen in which the shape of the 3D model shown in Fig. 3(c) in plan view and the dimensions drawn in the 2D drawing superimposed thereon are shown, and Fig. 4(b) illustrates a three-dimensional model verification screen in which the shape of the 3D model shown in Fig. 3 (c) in left side view and the dimensions drawn in the 2D drawing superimposed thereon are shown, respectively.

The three-dimensional model used in the above explanation is constructed with simple shapes to make it easier to understand, but actual civil engineering structures have complex shapes, and it is extremely difficult to grasp the dimensions and shape of the final structure by comparing plan views. However, by adopting the method of using the three-dimensional CAD device of the present invention, even complex three-dimensional shapes can be recognized reliably, and the dimensions of each part can be easily understood.

Figure 5(a) illustrates an example of the operation screen of the 3D CAD device 1 with a front view imported, Figure 5(b) illustrates an example of the operation screen of the 3D CAD device 1 with a side view imported, and Figure 6(a) illustrates an example of the operation screen of the 3D CAD device 1 with a plan view imported. And Figure 6(b) shows a 3D model drawn in the 3D model space and the corresponding 2D drawing displayed semi-transparently.

By manipulating the icons on the operation screen to rotate the display, it is possible to display, for example, a 3D model facing directly on the front view and the corresponding 2D drawing superimposed on each other, making it easy to see the dimensions of each part.

Figure 7(a) illustrates an example of the operation screen of the 3D CAD device 1 into which a front view has been imported, Figure 7(b) illustrates an example of the operation screen of the 3D CAD device 1 into which a side view has been imported, and Figure 8(a) illustrates an example of the operation screen of the 3D CAD device 1 into which a plan view has been imported. Errors have been found in the dimensional display corresponding to the objects shown in each 2D drawing. And Figure 6(b) shows the 3D model drawn in the 3D model space and the corresponding 2D drawing displayed semi-transparently.

In this example, the dimensions of the 3D model and the corresponding 2D drawing do not correspond, and it is easy to determine that there is a discrepancy in the 2D drawing. In this example, it is possible to see that there is an error in the dimensional notation just by looking at the 2D drawing, but in actual complex shapes, it is often not easy to determine whether there is a discrepancy, and the method of using the 3D CAD device of the present invention is particularly useful in such cases. In particular, it is useful in that even for 3D shapes that are not easily understood in each 2D drawing, when a 3D model is generated based on each 2D drawing, it is extremely easy to determine that parts of the 3D models interfere with each other.

As described above, the method of using a three-dimensional CAD device according to the present invention for generating a three-dimensional structure in a three-dimensional drawing space includes a two-dimensional drawing input step of importing into the three-dimensional CAD device a plurality of two-dimensional drawings, each of which is represented from different viewpoints and on which dimension lines corresponding to the three-dimensional structure are drawn; a scale matching step of matching each scale of the two-dimensional drawings to a predetermined scale in the three-dimensional drawing space; a base point matching step of translating the two-dimensional drawings so that any base point included in the two-dimensional drawings matched to the predetermined scale is matched to a corresponding position in the three-dimensional drawing space; and a base point matching step of translating the two-dimensional drawings with the base points matched, if necessary, to a predetermined base line so that the viewpoint is matched to the three-dimensional drawing space. a viewpoint alignment step of rotating the two-dimensional drawing around an axis; a first drawing step of selecting one of the two-dimensional drawings for which the viewpoint has been aligned, displaying it on the screen as a first reference plane, and drawing a plane figure that will become a first object based on the dimension lines shown on the selected two-dimensional drawing; a second drawing step of selecting another two-dimensional drawing that intersects with the first reference plane, displaying it on the screen as a second reference plane, and drawing a solid figure that will become a second object by adding height to the first object based on the dimension lines shown on the two-dimensional drawing; and a three-dimensional model generation step of generating a three-dimensional model by repeatedly executing the first drawing step and the second drawing step for each two-dimensional drawing.

In the 2D drawing input step, multiple 2D drawing files with dimension lines corresponding to the 3D structure are imported into the 3D CAD device, and the 2D drawings are defined in the 3D drawing space. In the scale matching step, the scales of the multiple 2D drawings are unified, in the base point matching step, the multiple 2D drawings are moved based on a specified base point in the 3D drawing space, and in the viewpoint matching step, the 2D drawings corresponding to the specified base line are rotated around an axis so that the viewpoint is matched with the 3D drawing space, thereby matching the positional relationship of the multiple 2D drawings in the 3D drawing space based on the base point.

Then, in the three-dimensional model generation step, the first and second drawing steps are repeated to generate a three-dimensional model. In the first drawing step, one of the two-dimensional drawings with the aligned viewpoints is selected, the selected two-dimensional drawing is displayed on the screen as the first reference plane, and a planar figure that becomes the first object is drawn based on the dimension lines shown in the two-dimensional drawing. In the second drawing step, another two-dimensional drawing that intersects with the first reference plane is selected, the selected two-dimensional drawing is displayed on the screen as the second reference plane, and a solid figure that becomes the second object by adding height to the first object is drawn based on the dimension lines shown in the two-dimensional drawing. By repeatedly executing the first and second drawing steps for each two-dimensional drawing, an accurate three-dimensional model is generated extremely easily based on the two-dimensional drawings displayed on the display device.

It is also preferable that the method further comprises a consistency confirmation step of displaying the three-dimensional model generated by the three-dimensional model generation step and viewed from any of the viewpoints, and displaying the two-dimensional drawing corresponding to the viewpoint in a superimposed and facing direction, and confirming a consistency between the dimensions shown in the two-dimensional drawing and the three- dimensional model, and a three-dimensional model verification step of repeating the consistency confirmation step for the three- dimensional model viewed from each viewpoint.

In the consistency check step, the 3D model viewed from one of the viewpoints of the multiple 2D drawing files that were the basis of the 3D model generated in the 3D model generation step is displayed, and the 2D drawing corresponding to the viewpoint is displayed superimposed on the 3D model so as to face it directly, so that the dimensions of the corresponding elements of the 3D model can be easily understood by referring to the dimensions shown in the 2D drawing. In the 3D model verification step, the consistency check step is repeated for the 3D model viewed from each viewpoint.

The target three-dimensional model is preferably a civil engineering structure, and by executing the three- dimensional model verification step at a civil engineering construction site, for example, the site manager can very easily and accurately grasp the civil engineering structure that is the target of construction.

In the above embodiment, an example was described in which the target three-dimensional model was a civil engineering structure, but it goes without saying that the subject to which the present invention is applied is not limited to civil engineering structures, and can be applied to any three-dimensional structure.

The above-mentioned embodiments are merely one aspect of the present invention, and the technical scope of the present invention is not limited by the above description. It goes without saying that the specific configuration of each part can be appropriately modified and designed within the scope of the effects of the present invention.

1: 3D CAD device 21: 2D drawing input processing unit 22: scale matching processing unit 23: base point matching processing unit 24: viewpoint matching processing unit 25: drawing processing unit 26: 3D model generation processing unit 27: 3D drawing management unit 28: display processing unit

Claims (3)

A three-dimensional CAD device for generating a three-dimensional structure in a three-dimensional drawing space, comprising:
a two-dimensional drawing input processing unit that imports a plurality of two-dimensional drawings, each of which is expressed from a different viewpoint and has dimension lines corresponding to the three-dimensional structure, into the three-dimensional CAD device;
a scale matching processing unit that matches each scale of the two-dimensional drawing to a predetermined scale in the three-dimensional drawing space;
a base point matching processing unit that translates the two-dimensional drawing so that an arbitrary base point included in the two-dimensional drawing aligned to the predetermined scale is aligned with a corresponding position in the three-dimensional drawing space;
a viewpoint alignment processing unit that rotates the two-dimensional drawing, the base point of which has been aligned, about a predetermined base line as necessary so that the viewpoint is aligned with the three-dimensional rendering space;
a first drawing processing unit that selects one of the two-dimensional drawings with the aligned viewpoints, displays it on a screen as a first reference plane, and draws a plane figure that is to be a first object based on the dimension lines shown on the selected two-dimensional drawing;
a second drawing processing unit that selects another two-dimensional drawing that intersects with the first reference plane, displays it on the screen as a second reference plane, and draws a three-dimensional figure that becomes a second object by adding height to the first object based on the dimension lines shown on the two-dimensional drawing ;
a three-dimensional model generation processing unit that generates a three-dimensional model by repeatedly executing the first rendering processing unit and the second rendering processing unit for each two-dimensional drawing;
a display processing unit that displays the three-dimensional model generated by the three-dimensional model generation processing unit and viewed from any one of the viewpoints, and also displays the two-dimensional drawing corresponding to the viewpoint in a superimposed manner so as to face the two-dimensional drawing, and confirms a matching state between the dimensions shown in the two-dimensional drawing and the three- dimensional model;
A three-dimensional CAD device including: The 3D CAD device according to claim 1, wherein the 3D model is a civil engineering structure. A three-dimensional structure generating method for generating a three-dimensional structure in a three-dimensional drawing space by a three-dimensional CAD device, comprising the steps of:
a two-dimensional drawing input step, which is executed by a two-dimensional drawing input processing unit, for importing into the three-dimensional CAD device a plurality of two-dimensional drawings, which are expressed from different viewpoints and on which dimension lines corresponding to the three-dimensional structure are drawn;
a scale matching step of matching each scale of the two-dimensional drawing to a predetermined scale in the three-dimensional drawing space, the scale matching step being executed by a scale matching processing unit;
a base point matching step, which is executed by a base point matching processing unit, of translating the two-dimensional drawing so that any base point included in the two-dimensional drawing aligned to the predetermined scale is aligned with a corresponding position in the three-dimensional drawing space;
a viewpoint alignment step, which is executed by a viewpoint alignment processing unit, of rotating the two-dimensional drawing, the base point of which has been aligned, about a predetermined base line as necessary so that the viewpoint is aligned with the three-dimensional drawing space;
a first drawing step, which is executed by a first drawing processing unit, of selecting one of the two-dimensional drawings to which the viewpoint is aligned, displaying it on a screen as a first reference plane, and drawing a plane figure to be a first object based on the dimension lines shown on the selected two-dimensional drawing;
a second drawing step, which is executed by a second drawing processing unit, of selecting another two-dimensional drawing that intersects with the first reference plane, displaying it on the screen as a second reference plane, and drawing a three-dimensional figure that becomes a second object by adding height to the first object based on the dimension lines shown on the two-dimensional drawing;
a three-dimensional model generating step, which is executed by a three-dimensional model generating processing unit, for repeatedly executing the first drawing step and the second drawing step for each two-dimensional drawing to generate a three-dimensional model;
a matching state confirmation step, which is executed by a display processing unit, for displaying the three-dimensional model generated by the three-dimensional model generating step and viewed from any one of the viewpoints, and for displaying the two-dimensional drawing corresponding to the viewpoint in a superimposed manner so as to face the two-dimensional drawing, and for confirming a matching state between the dimensions shown in the two-dimensional drawing and the three-dimensional model;
a 3D model verification step of repeating the matching state confirmation step for the 3D model viewed from each viewpoint;
A three-dimensional structure generating method that executes the above.

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