JP2000222599A - Two-dimensional drawing preparing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate a two-dimensional(2D) drawing preparation without complicated item designation by extracting the face, which has the largest area among planes in a 3D model, turned to the right out of second front view candidates and defining it as the final front view. SOLUTION: The lengths of longitudinal and lateral sides of the planes of a cubic model 10 that has obtained first front view candidate, are compared (S205). When the absence of a difference between the longitudinal and lateral sides is judged in that comparison (S206), the planes in the 3D model are simultaneously retrieved from four directions of up, down, left and right at the time of extracting the first front view candidates (S209). As a result, the first discovered planes are mutually compared (S210). When the areas of planes in the 3D model are judged different as a result (S211), the front view having the plane of the largest area turned to the right is selected as a 2D drawing to be prepared and this is determined as the final front view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for creating a two-dimensional drawing such as a front view, a side view, and a plan view from a three-dimensional model using data of a CAD drawing.

[0002]

2. Description of the Related Art Conventionally, using data of a CAD drawing,
A method of creating a two-dimensional drawing such as a front view, a side view, and a plan view from a three-dimensional model determines a surface viewed from an arbitrary direction in a three-dimensional model as a front view, and based on this, for example, In addition to the side view and plan view, the so-called 3
This is for creating a plan view, a six-view drawing, and the like.

More specifically, when a two-dimensional drawing (three-view drawing) 20 as shown in FIG. 12B is drawn from a three-dimensional model 1 as shown in FIG. 12A, first, a surface to be a front view is determined. Then, the side view and the plan view are added to this,
It is like setting it to 0. .

[0004]

When such a two-dimensional drawing is created, it is necessary to specify at least the following items. Designation of a front view view This is to designate a coordinate view of the three-dimensional model and a direction in which the three-dimensional model is to be arranged as a front view of the two-dimensional drawing. Note that a surface drawn as a two-dimensional drawing is referred to as a view (VIEW) from the viewpoint of seeing a certain surface of a three-dimensional model.

[0005] Normally, in the case of three-dimensional coordinate axes of X, Y and Z,
The front view that can be specified is, first, an XY plane as a view viewed from the Z-axis direction, and a Y rotated by 90 degrees clockwise.
-X plane, further rotated by 90 degrees -XY plane, further 90
-YX plane rotated by degrees, -XY plane viewed from the opposite direction of Z axis (+ Z direction from -Z axis direction), YX plane rotated by 90 degrees clockwise, XY plane further rotated by 90 degrees, Furthermore, there are eight types of -YX plane rotated 90 degrees.
Furthermore, since the views viewed from the Y-axis direction and the X-axis direction and from the -Y-axis direction and the -X-axis direction are added, there are a total of 24 views. Therefore, the designation of the front view is to designate any one of these 24 ways. Designation of a surface other than the front view This designates a surface to be created other than the front view. For example, in the case of a three-view view, in addition to the front view, a side view and an upper plan view, and in the six-view view, a front view In addition to the figures, a right side view, a left side view, an upper plan view, a lower plan view, and a rear view are designated. Designation of the paper size for drawing the two-dimensional drawing This specifies the size of the paper for drawing each figure specified above and above, and is usually A3, A2, A1, A
Designate from JIS paper sizes such as 0, 1.5 AO, 2A0. Designation of the scale of the drawing to be created This specifies the scale (scale) of the drawing to be drawn on the paper, and is usually a standardized scale such as 2/1, 1/1, 1/2, 1/4 Specify from among. The layout of each figure on a sheet is specified so that each figure specified in the above and is drawn at an appropriate position on the paper specified above on the scale specified above.

As described above, in order to create a two-dimensional drawing, it is necessary to specify at least five items, and the specification of the front view is particularly important.

If a front view is designated, the other items are automatically determined. For example, if the front view is determined, the left and right side surfaces and the upper and lower planes are determined when the front view is determined. The paper size and scale are determined so that the front view and other views can be inserted. This is because the view of another view may be arranged.

On the other hand, the front view is basically 3
Although any view of the dimensional model may be a front view, it is not necessarily specified freely, and is usually specified according to some rule. For example, when drawing a drawing, it is said that it is preferable to draw the drawing so that the margin is small on a sheet and each drawing has a scale that is easy to see. From this point of view, the designation of the front view is such that when the 3D model is viewed from each axis direction (including when viewed from the (-) minus direction of each axis),
It is preferable that the designation be made along the horizontal axis of the two-dimensional drawing. As a result, a rectangular drawing sheet is usually set horizontally for two
When a dimensional drawing is created, the scale of the drawing can be maximized in the paper, and an efficient drawing arrangement with a small margin can be obtained.

However, since such a front view view is specified by a human looking at the three-dimensional model, an error is likely to occur. For example, if the specification is accurate, the specified size paper is specified. Although it is possible to arrange on a scale, two-dimensional drawings cannot be drawn on a desired sheet or scale due to an incorrect specification. In such a case, the front view is redesignated from the beginning, or if it is worse, the paper size or scale can be changed without noticing the mistake of the front view designation.
You have to do very complicated work repeatedly.

[0010] In the first place, the specification itself of each item as described above is troublesome.
When creating a three-dimensional drawing, it is necessary to repeat the designation for each three-dimensional model, and it is desired to automate such operations.

Therefore, the present invention provides a CAD system
It is an object of the present invention to provide a two-dimensional drawing creation method that can automatically create a two-dimensional drawing without performing complicated item designation when creating a two-dimensional plan from a three-dimensional model. As described above, an object of the present invention is to provide a two-dimensional drawing creation method capable of automatically specifying the most difficult front view.

[0012]

The object of the present invention is achieved by the following means. (1) A method of creating a two-dimensional drawing from three-dimensional model data, comprising: creating a cubic model including the three-dimensional model from the three-dimensional model data; Detecting a surface having the largest area of each surface and extracting a view of the three-dimensional model from a direction in which the surface is viewed as a first front view candidate; and extracting the first front view candidate The longitudinal direction of the face of the cubic model at this time is extracted from the first front view candidate along the horizontal axis of the two-dimensional drawing to be created, and is extracted as the second one.
Making a front view candidate; detecting a face in the three-dimensional model perpendicular to a longitudinal direction of the face of the cubic model when the first front view candidate is extracted; Among the faces in the three-dimensional model detected in the step of detecting the face, the face having the largest area is extracted from the second front view candidate, and the face facing the right side is extracted. Determining a final front view of the two-dimensional drawing. (2) The step of detecting a surface in the three-dimensional model includes retrieving the three-dimensional model data from both ends to the inside in the longitudinal direction of the surface of the cubic model. How to create 3D drawings. (3) A method for creating a two-dimensional drawing from three-dimensional model data, comprising: creating a cubic model including the three-dimensional model from the three-dimensional model data; Detecting a surface having the largest area of each surface and extracting a view of the three-dimensional model from a direction in which the surface is viewed as a first front view candidate; and extracting the first front view candidate When the length of the vertical and horizontal sides of the surface of the cubic model is the same, when the first front view candidate is extracted from the three-dimensional model data, inward from the top, bottom, left, and right directions of the cubic model, respectively. Detecting a surface in the three-dimensional model, and creating a part having a surface having the largest area among the surfaces in the three-dimensional model detected in the step of detecting the surface in the three-dimensional model.
Extracting the one facing the right side of the three-dimensional drawing from among the first front view candidates and determining this as the final front view;
A two-dimensional drawing creation method, comprising: (4) The two-dimensional drawing creation method further includes a step of determining, based on a predetermined scale, a sheet size on which the final front view and the predetermined surface drawing are to be inserted. Drawing creation method. (5) The step of determining the paper size includes, using a predetermined scale from among the drawing size candidates prepared in advance, changing the paper size in which the final front view and the drawing of the predetermined surface are included. At this time, if there is no sheet size in which the final front view and the figure of the predetermined surface can be entered by the predetermined scale in the previously prepared drawing size candidates. Is a method for creating a two-dimensional drawing, wherein the scale is changed.

[0013]

According to the present invention, the following effects can be obtained for each claim.

According to the first aspect of the present invention, a cubic model containing the three-dimensional model data is created, and the largest area of the created cubic model is extracted as a first front view candidate. Subsequently, a candidate in which the longitudinal direction of the surface is horizontal is extracted as a second front view candidate from among them, and subsequently, a three-dimensional image perpendicular to the longitudinal direction of the surface of the cube model from which the first front view candidate is extracted is extracted. A surface in the model is detected, and a surface having the largest area of the detected surface in the three-dimensional model, which is directed to the right, is extracted from the second front view candidates, and is extracted as a final front view. Since the figure is selected, the figure viewed from the direction having the largest area as the front view is selected and the figure is arranged horizontally, so that the two-dimensional drawing can be efficiently arranged on the sheet. Automatically determine front view It is possible. In addition, since the side having the large area of the surface in the three-dimensional model is arranged on the right side, the center of gravity of the three-dimensional model is always arranged on the right side.

According to the second aspect of the present invention, when detecting a surface in the three-dimensional model perpendicular to a longitudinal direction of the surface of the cube model when the first front view candidate is extracted, Since the three-dimensional model data is searched inward from both ends in the longitudinal direction of the surface of the model, it is possible to simultaneously detect the side that becomes the center of gravity of the three-dimensional model from two directions.

According to the third aspect of the present invention, a cubic model including the cubic model is created from the three-dimensional model data, and the cubic model having the largest area is extracted as a first front view candidate. Subsequently, a surface in the three-dimensional model is detected from the upper, lower, left, and right directions of the cubic model from which the first front view candidate is extracted, and a portion having the largest area among the detected surfaces in the three-dimensional model is defined as a part of the two-dimensional drawing. Since it is directed to the right side, the center of gravity of the three-dimensional model in which the view viewed from the direction having the largest area as the front view is selected as the front view and the front view is a square having no difference in length and width. Will be automatically arranged so that the side with the mark always faces the right side.

According to the present invention, a front view finally determined by a predetermined scale,
Since the method further includes the step of determining the paper size on which the drawing of the other surface is to be placed, it is possible to automatically determine the size of the paper on which the two-dimensional drawing drawn by the predetermined scale can be placed.

According to the fifth aspect of the present invention, a front view finally determined by a predetermined scale,
At the stage of determining the paper size in which the drawings of the other surfaces are to be included, if there is no size that can accommodate all the surface drawings among the prepared drawing size candidates, the scale is changed. If there is no paper that is large enough to fit all sides in the determined scale, the scale is automatically changed to fit on the prepared paper,
The optimal scale for the paper is determined.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 shows a second embodiment according to the present invention.
It is a main flowchart showing a processing procedure for creating a three-dimensional drawing, and FIGS. 2 to 4 are subroutine flowcharts of main steps in the main flowchart.

In the present embodiment, as shown in FIG. 12, a three-dimensional model 1 of a three-dimensional model 1 of a clamp jig used in a production line of an automobile body is converted into a two-dimensional drawing as a three-sided view 20 as an example. explain.

As shown in FIG. 1, the basic processing procedure of the two-dimensional drawing creation method according to the present embodiment is as follows. First, a two-dimensional drawing is created from three-dimensional model data previously stored in a CAD system. Along with designating the three-dimensional model, the number of planes (for example, three-plane and six-plane) to be created is specified (S1). At this time, a plurality of three-dimensional models may be selected. In this case, the following steps S2 to S5 are repeatedly executed for each selected model. In the present embodiment, a clamp jig is designated as a three-dimensional model as described above, and a three-dimensional view is designated for a two-dimensional drawing to be created.

Subsequently, a process of determining a front view using the three-dimensional model data is performed (S2), a process of determining a paper size and a drawing scale (S3), and a drawing layout process are performed (S4). Finally, a two-dimensional drawing is output from a printer (or plotter) connected to the CAD system (S5).

Next, the procedure of the front view view determination process in the above basic procedure will be described with reference to FIG.

First, the maximum value and the minimum value from the origin are obtained for each of the three-dimensional coordinate X, Y, and Z axes from the data of one selected three-dimensional model (S201). From the maximum value and the minimum value, as shown in FIG.
The cubic model 10 including the entire dimensional model 1 and having a plane parallel to each coordinate axis is drawn (S202). Note that the reason why the maximum value and the minimum value are obtained in step S201 is that the size of the three-dimensional model is calculated based on the coordinate position from the origin on the three-dimensional coordinates. When the part is located at the origin of the three-dimensional coordinates, it is only necessary to find the maximum value. Further, a cubic model including the three-dimensional model may be drawn directly from the dimension data of the three-dimensional model without going through S201.

Subsequently, the areas of three planes (XY plane, YZ plane, ZX plane) of the obtained cubic model 10 viewed from the respective axial directions are obtained (S203).

Then, the same direction as the direction in which the largest area of the obtained areas is viewed is set as a first front view candidate (first front view candidate) (S204). This allows
In the case of the three-dimensional model 1, the surface viewed from the Z-axis direction has the largest area.
X plane, -XY plane, -YX plane, -XY plane, YX plane, X-
Eight patterns of the Y plane and the −YX plane are extracted.

Subsequently, the lengths of the vertical and horizontal sides of the surface of the cubic model 10 from which the first front view candidate has been obtained are compared (S20).
5).

As a result of the comparison, if it is determined that the vertical and horizontal lengths are different (S206), subsequently, a view in which the longitudinal direction of the surface of the cubic model is horizontal is selected from the first front view view candidates. It is selected as a candidate for the second front view (second front view candidate) (S207). In the three-dimensional model 1, since the Y-axis direction is longer than the X-axis direction, the candidate for the second front view of the three-dimensional model is -Y- as shown in FIG.
X plane (FIG. 6A), YX plane (FIG. 6B), -YX plane (FIG.
C), and four views (VIE) of the YX plane (FIG. 6D).
W).

Subsequently, the three-dimensional model data is simultaneously searched from both ends in the longitudinal direction of the cubic model 10 toward the inside, that is, from both the positive and negative axes along the longitudinal direction from both ends in the longitudinal direction. Then, a plane perpendicular to the longitudinal direction in the three-dimensional model is detected (S208). Therefore, in the three-dimensional model 1, as shown in FIG.
The search is started simultaneously from the two directions of the Y axis direction and the −Y axis direction.

On the other hand, in the comparison of the vertical and horizontal sides in step S205, when it is determined that there is no difference between the vertical and horizontal sides (S206), the upper, lower, left and right sides of the surface when the first front view view candidate is extracted are determined. A surface in the three-dimensional model is simultaneously searched from the four directions (S209). Therefore, in this case, when the first front view candidate is viewed from the Z axis direction, the + X axis direction, the −X axis direction, the + Y axis direction, and the −Y
The search is started simultaneously from four axial directions.

Subsequently, at step S208 or S2
As a result of searching for a face in the three-dimensional model in 09, the faces found first are compared (S210).

Then, as a result of the comparison, when it is determined that the areas of the faces in the three-dimensional model are different (S211), the face having the largest area faces the right side as the two-dimensional drawing to be created. Step S
After passing through steps 207 and S208, a second front view candidate is selected from among the second front view candidates and determined as the final front view (S212). Thus, in the case of the three-dimensional model 1, the view on the YX plane is determined as the final front view as shown in FIG. On the other hand, step S2
In the case of passing through 09, a candidate is selected from among the first front view views and is determined as the final front view.

In step 210, as a result of comparing the first found faces with each other, if the areas are the same (S211), either of them may be set to the right side. For example, a code is added to each view in advance. In the same manner as described above, selection is made from among the front view candidates so that the code number having the smaller number is the right side (S213).

Here, the processing of steps S210 to S213 is a processing for detecting the position of the center of gravity in the three-dimensional model. Usually, the position of the center of gravity of the three-dimensional model is located on the side having the largest area. The determination is made by detecting a surface in the three-dimensional model. In particular, when the three-dimensional model is a clamp jig as in the present embodiment, the clamp jig has a pedestal on the ground side, and there is a clear difference in the size of the three-dimensional model in the vertical direction as the shape of the three-dimensional model, and Because there is a large area on the ground side, such processing is more efficient,
The ground side with the center of gravity of the clamp jig can be detected. When the three-dimensional model has a small area difference in the vertical direction, instead of such processing, all the searched surfaces may be compared, and the one having the largest area may be set to the right side. .

After the final front view is determined as described above, the process returns to the main routine.

Next, a procedure for determining the paper size and the drawing scale will be described with reference to FIG.

First, the drawing scale is set to 1/1 (S301). The value 1/1 of this scale is set in advance, and another value may be set.

Subsequently, the minimum required rectangle size of the drawing to be drawn on the sheet is obtained from the finally determined front view, view to be created, and scale (S302).
This process is performed to obtain the minimum size required for drawing creation. In addition, since the three views are created in this embodiment, the views to be created are two views of the left side view and the top plan view in addition to the front view.

The size of each of these views can be easily obtained from the cubic model described above since the front view has already been determined at this time. In the case of the present embodiment, as shown in FIG. 9, the length of A of the cubic model 10 including the three-dimensional model 1 multiplied by the scale value creates the horizontal length of the front view on the drawing. And B
Is the length of the left side view. Therefore, the minimum required horizontal length of the rectangle is (A + B) × scale value. On the other hand, the vertical length of the rectangle is the vertical length of the front view obtained by multiplying the length of C in FIG. 9 by the scale value, and the vertical length of the length of B is multiplied by the scale value. It becomes the vertical length of the figure. Therefore, the minimum required vertical length of the rectangle is (C + B) × scale value. FIG. 10 shows the positional relationship between A, B, and C when actually drawn as a drawing.

Subsequently, the size of the rectangle obtained in the step S302 is added to the size of the rectangle, and a blank space for entering balloons and the like is added to obtain a rectangle of a size required for drawing (S30).
2). For this purpose, for example, a fixed value serving as a margin may be added to the size of the rectangle obtained in step S302, or the size may be increased at a fixed magnification. The size of the rectangle obtained here is called the final drawing size. More specifically, for example, a margin of 20 m may be set in the left, right, up, and down for each plan view, and this may be added for each plan view. As a result, as shown in FIG. 10, a final drawing size in which each view including the margins can be obtained is obtained.

Subsequently, the size of the obtained final drawing size is a size that falls within the effective range in which the drawings on the paper can be created, and the minimum paper size among the sizes is set to the previously prepared paper size. A selection is made from the candidates (S304).
Here, the paper size candidates prepared in advance include:
For example, in JIS-A series paper, A3, A2, A1, A
0, 1.5 AO, 2A0, etc. Therefore, for example, A1,
When A0, 1.5A0, and 2A0 can be selected, the smallest A1 is selected. Here,
If there is no selectable paper size, paper NG is output.

Subsequently, it is determined whether or not the paper NG has been output (S305).

Here, when the paper size has been selected, it is determined to use the currently selected paper size and the current scale value (S306), and the process returns to the main routine. On the other hand, when the paper size cannot be selected, the scale value is scaled down (S307).
Therefore, for example, when the scale value is 1/1, the scale value is changed to 1/2, and when the scale value is 1/2, the scale value is changed to 1/4. Then, the process returns to step S302, and the subsequent processing is repeatedly executed.
At 307, a paper size and a scale value that can accommodate all the view drawings are determined.

Next, the procedure of the drawing layout will be described with reference to FIG.

First, the front view and the view drawings of the other surfaces are arranged with a predetermined margin (S40).
1). Here, since the three-view drawing is created, the front view, the left-side view, and the top-plan view finally obtained in the above-described front-view determination processing are converted into the above-described paper size and drawing scale determination. The scale is reduced according to the scale value determined in the processing, and a predetermined margin is set in a rectangle of the final drawing size, for example, 20 mm on each of the left, right, upper and lower sides for each plan view. Thus, the arrangement of each view as shown in FIG. 11A is determined.

Subsequently, the center 7 of the rectangle 5 of the final drawing size obtained in the above-described paper size and drawing scale determination processing is obtained (S402) (see FIG. 11A).

Subsequently, the center 27 within the effective range 23 for creating a drawing in the sheet 21 of the sheet size determined in the above-described sheet size and drawing scale determination processing is obtained (S403). Note that this effective range 23 corresponds to FIG.
As shown in the figure, normally, in the paper 21, there is provided a column 25 for entering the title and number of the drawing, so that the range in which the drawing can be drawn without occupying these columns 25 is referred to as an effective range 23 here. It is called.

Subsequently, as shown in FIGS. 11A and 11B, the center 7 of the final drawing size 5 obtained in the step S402 and the center 27 of the effective area 23 of the paper 21 are combined, and the process is performed in the step S401. According to the arrangement of each view, a drawing layout for arranging each view in the paper 21 is determined (S404). Then, the process returns to the main routine.

Since the drawing layout of each view has been determined as described above, the main routine outputs the drawing of each view on paper according to the layout.

In the above-described embodiment, the portion that requires manual operation is basically only the designation of the three-dimensional model to be converted into a two-dimensional drawing and the designation of the number of views, and all other portions are automatically performed. Therefore, the two-dimensional drawing can be created from the three-dimensional model data with a very simple operation and without mistake.

In the above-described embodiment, the clamp jig has been described as an example of the three-dimensional model. However, the present invention is not limited to such a three-dimensional model.
It can be suitably used for various three-dimensional models. In addition, the present invention is not limited to the three-view drawing, and can be applied to the creation of a six-view drawing and more (or less) two-dimensional drawings.

[Brief description of the drawings]

FIG. 1 is a main flowchart showing a processing procedure for converting a three-dimensional model into a two-dimensional drawing by applying the present invention.

FIG. 2 is a subroutine flowchart showing a procedure of a process of determining a front view in the main flowchart shown in FIG. 1;

FIG. 3 is a subroutine flowchart illustrating a procedure of a scale determining process in a main flowchart shown in FIG. 1;

FIG. 4 is a subroutine flowchart showing a procedure of a drawing layout process in the main flowchart shown in FIG. 1;

FIG. 5 is a perspective view for explaining a cubic model including a three-dimensional model (X, Y, and Z in the figure indicate three-dimensional coordinates).

FIG. 6 is a diagram showing front view view candidates.

FIG. 7 is a perspective view for explaining a search for a plane in a three-dimensional model (X, Y, and Z in the figure indicate three-dimensional coordinates).

FIG. 8 is a diagram showing a finally determined front view.

FIG. 9 is a perspective view of a three-dimensional model for explaining a process for determining a paper size and a scale (in the figure, X, Y, and Z indicate three-dimensional coordinates).

FIG. 10 is a view showing a state where the sheet is actually arranged as a two-dimensional drawing for explaining the paper size and scale determination processing.

FIG. 11 is a drawing for explaining a drawing layout.

FIG. 12 is a drawing showing an example of creating a two-dimensional drawing from a three-dimensional model.

[Explanation of symbols]

 1 3D model, 2 2D drawing, 10 Cube model.

Claims (5)

[Claims] 1. A method for creating a two-dimensional drawing from three-dimensional model data, comprising: creating a cubic model including the three-dimensional model from the three-dimensional model data; Detecting a surface in which the area of each surface is the largest, and extracting a view of the three-dimensional model from a direction in which the surface is viewed as a first front view candidate; Is extracted from the first front view candidate, the one along the horizontal axis of the two-dimensional drawing created by the longitudinal direction of the surface of the cube model when the
Making a front view candidate; detecting a face in the three-dimensional model perpendicular to a longitudinal direction of the face of the cubic model when the first front view candidate is extracted; 3 detected at the stage of detecting the surface of
Extracting, from among the second front view candidates, the face having the largest area among the faces in the two-dimensional model from the second front view candidate, and determining this as the final front view; And a method for creating a two-dimensional drawing. 2. The method according to claim 1, wherein the step of detecting a surface in the three-dimensional model includes retrieving the three-dimensional model data inward from both ends of the surface of the cubic model in a longitudinal direction. The method for creating a two-dimensional drawing according to claim 1. 3. A method for creating a two-dimensional drawing from three-dimensional model data, comprising: creating a cubic model including the three-dimensional model from the three-dimensional model data; Detecting a surface in which the area of each surface is the largest, and extracting a view of the three-dimensional model from a direction in which the surface is viewed as a first front view candidate; When the length of the vertical and horizontal sides of the surface of the cubic model when extracting is the same, from the three-dimensional model data, respectively, from the top, bottom, left and right directions of the cubic model when the first front view candidate is extracted Inward, detecting a surface in the three-dimensional model, and detecting the surface in the three-dimensional model.
Of the faces in the two-dimensional model, those that face the right side of the two-dimensional drawing created by the portion having the largest area are extracted from the first front view candidates and determined as the final front view. Performing a two-dimensional drawing. 4. The two-dimensional drawing creation method further includes a step of determining, based on a predetermined scale, a sheet size in which the final front view and the predetermined surface drawing are to be inserted. Claim 2 of Claim 1 or Claim 3
How to create 3D drawings. 5. The step of deciding the sheet size is performed on a sheet in which the final front view and the figure of a predetermined surface are entered according to a predetermined scale from a set of drawing size candidates prepared in advance. The size is determined. At this time, among the drawing size candidates prepared in advance,
The scale is changed when there is no paper size that fits the final front view and the figure of the predetermined surface according to a predetermined scale.
The two-dimensional drawing creation method described in the above.