JPH0623990B2 - 3D container design device - Google Patents

Description

The present invention relates to an apparatus for designing a three-dimensional container, and more particularly to an apparatus for designing a three-dimensional container that is not a rotating body.

[Conventional technology]

Along with the diversification of products, containers with various designs have been distributed. Moreover, the shape of the container is not a simple geometrical figure, but is often a combination of complicated shapes. Nowadays, with the spread of computers, CAD three-dimensional containers are being designed. The designer of the three-dimensional container can design while looking at the three-dimensional image displayed on the display.

[Problems to be Solved by the Invention]

However, a conventional three-dimensional container designing device using a CAD system has a problem that the design is considerably difficult and requires skill. In particular, in the case of a three-dimensional container that is not a rotating body, it is necessary to always consider the three-dimensional coordinate values of X, Y, and Z. The current situation is that it cannot be designed. It is very difficult to express a feature of a figure in three dimensions.

Therefore, an object of the present invention is to provide a three-dimensional container designing device that can easily design a three-dimensional container.

[Means for Solving the Problems]

The present invention defines a vertical section input means for inputting a vertical section of a three-dimensional container to be designed as a plane figure on an XY plane, and a portion having a Y coordinate value within a predetermined range in the vertical section is defined as a constraint range. For the constraint range input means and the defined constraint range, the cross section of the three-dimensional container is XZ
Cross-section input means for inputting as a plane figure on a plane, storage device for storing the data input by each of the above-mentioned input means, and longitudinal cross-section data for a part outside the constraint range that does not belong to the constraint range Out-of-constraint range calculation means for calculating the cross-section of the part based on the cross-section data of the restricted range on both sides of the part, and the input result by each of the above-mentioned input means and the calculation result by the out-of-constraint range calculation means The three-dimensional container designing device is configured by a display device that displays.

[Action]

In the device according to the invention, the longitudinal section and the transverse section are entered separately. The designer first designs the vertical section. Since the vertical section is given as a plane figure on the XY plane, it is very easy to design. Subsequently, with reference to this vertical section, a horizontal section is designed within a predetermined constraint range. Since this cross section is given as a plane figure on the XZ plane, the design can be easily performed. The constraint range can be defined as a portion having a Y coordinate value within a predetermined range. Then, for a portion outside the constraint range in which the cross section is not defined, a cross section is calculated by calculation based on the cross section defined for two constraint ranges sandwiching the portion from both sides and the vertical cross section of the portion. Is defined. Therefore, the designer only needs to define a longitudinal section on the XY plane and a few transverse sections on the XZ plane for some constraint ranges. Therefore, it is possible to easily perform a design that captures the characteristics of the solid.

〔Example〕

The present invention will be described below based on illustrated embodiments. First
FIG. 1 is a block diagram showing the basic configuration of a three-dimensional container designing apparatus according to an embodiment of the present invention. This apparatus has three input means: a vertical cross section input means 1, a constraint range input means 2 and a horizontal cross section input means 3. The data input from these three input means is stored in the storage device 4. The vertical section input means 1 has a function of inputting the vertical section of the three-dimensional container to be designed as a plane figure on the XY plane. The constraint range input means 2 has a function of defining, as a constraint range, a portion having a Y coordinate value within a predetermined range in the vertical cross section input by the vertical cross section input means 1. In addition, the cross-section input means,
XZ of the cross section of the three-dimensional container for the defined constraint range
It has a function of inputting as a plane figure on a plane. The out-of-constraint range calculation means 5 has a function of calculating a cross-section outside the restricted range based on these input data.
Then, the display device 6 displays the input result by the above-mentioned input means and the calculation result by the out-of-constraint range calculation means 5.

In reality, each of these components is realized by a computer and its peripheral devices. For example, in this embodiment, each input means is composed of a tablet connected to a computer, the storage device 4 is a memory of this computer, and the out-of-constraint range calculation means 5 is a CPU of this computer and software for operating the same. Has been done. The display device 6 is a display device connected to this computer.

Next, the operation of this device will be described. For convenience of description, the operation of this device will now be described based on a specific example of designing a tube container as shown in FIG. FIG. 3 is a flowchart showing the designer's design procedure. First, in step S1, a vertical cross section is designed. In this embodiment, a plane figure as shown in FIG. 4 is input on the XY plane. The input of this plane figure is performed by the vertical section input means 1, that is, the tablet. The designer designs the plane figure while looking at the display screen of the display device 6. This may be done, for example, by displaying the position of the tablet pen on the display screen and connecting the points specified by the designer with a straight line. In addition, various methods of inputting a plane figure with an input device such as a tablet are
Since the method is already known by a CAD system or the like, detailed description thereof will be omitted here.

Then, in step S2, a constraint range is designated. The designation of the constraint range is performed by designating the range of the Y coordinate value. In this embodiment, the section a in FIG. 4 is designated as the constraint range. That is, y ₂ ≦
The range satisfying the condition of Y ≦ y ₃ is the constraint range. The constraint range is designated by the constraint range input means 2, that is, the tablet in the case of the present embodiment.

When the constraint range is designated, in step S3, the transverse section is designed for the designated constraint range. In this embodiment, a cross section as shown in FIG. 5 (a) is input. The input of the cross section is performed by the cross section input means 3, and the input data is handled as a point on the XZ plane. In the case of the present embodiment, the vertical cross section shown in FIG. 4 and the horizontal cross section shown in FIG. 5 (a) are simultaneously displayed on the display by dividing the screen, and the designer can see the vertical cross section while viewing the tablet. Enter the cross section with.

When the design of the cross section for one constraint range is completed,
In step S4, it is determined whether all constraint ranges have been designated. In this embodiment, another section b
There are two restraint ranges.

Therefore, returning to step S2, the range satisfying the condition of y ₀ ≦ Y ≦ y ₁ is set as the constraint range, and the cross section shown in FIG. 5 (b) is input in step S3. Thus
In this embodiment, designation of all constraint ranges is completed. Here, the constraint range is a range in which the cross-sectional shape is constrained to the defined cross-sectional shape. Therefore, in the case of the present embodiment, the restraint range a has a flat elliptical cross section as shown in FIG. 5 (a), and the restraint range b is a circle crossing as shown in FIG. 5 (b). You will have a face. In the case of the restraint range b, a constricted part (a part corresponding to between the body part of the tube container and the cap part) on the way.
Exists, but this part also has the circular cross section shown in FIG. 5 (b). That is, the cross section of the cap portion has a radius X
A _second circular cross section of the constricted portion is a circle of radius x _1. As described above, the cross section shows a similar shape to the cross section in the restricted range, and the absolute size is determined according to the vertical section.

The cross-section input means 3 is similar to the vertical-section input means 1 in CA
The input method generally used in the D system may be adopted, but the apparatus of the present embodiment can also perform a simpler input method. This is a method in which several kinds of basic figures as shown in FIGS. 6 (a) to 6 (d) are prepared in advance and, if necessary, these basic figures are magnified to obtain a desired cross section. For example, if a circle as shown in FIG. 5 (b) is input as the cross section, it is only necessary to select the basic figure circle shown in FIG. 6 (a). If a flat ellipse as shown in FIG. 5 (a) is input as a cross section, the super ellipse shown in FIG. 6 (c) is selected and then the aspect ratio is changed to obtain a flat figure. Generally, the cross-section of a three-dimensional container is often applied to several kinds of basic figures and figures obtained by multiplying these basic figures, and such a simple input method is extremely effective.

If it is determined in step S4 that the designation of all constraint ranges has been completed, the calculation outside the constraint range in step S5 is performed. As described above, the cross section of one restraint range is restrained by one inputted similar figure.
Therefore, a portion that is not similar to the cross section of the similar shape of a certain figure cannot be set as the constraint range.
In the case of the present embodiment, both ends (sections a and b) of the tube container can be within the restricted range, but the portion between them (section c) cannot be within the restricted range as can be seen from FIG. For the portion outside the constraint range, the cross section is automatically determined by the constraint range calculating means 5. Therefore, in the flowchart of FIG. 3, the designer's actual work is up to step S4, and the following work is a work automatically performed by the computer.

The calculation outside the constraint range in step S5 is performed based on the vertical cross section outside the constraint range and the horizontal cross section about the constraint range sandwiching the vertical cross section. That is, the calculation for obtaining the cross section of the section c is performed based on the vertical cross section shape of the section c shown in FIG. 4 and the cross section shape of the sections a and b shown in FIG. Therefore, the part outside the restricted range must be sandwiched between the two restricted range parts. In other words, the upper end and the lower end of the container must be within the restricted range. In the present embodiment, the part outside the constraint range is only the part of the section c, and there is only one position. However, when the constraint range is provided at several positions, the part outside the constraint range exists at a plurality of positions between them. Therefore, the calculation in step S5 is performed separately for each location.

Now, in the case of the present embodiment, the cross section for the section c outside the constraint range is obtained, but the cross section of this section has a different shape depending on its position. For example, the one closer to the section a will be a flat ellipse, and the one closer to the section b will be a circle. Therefore, it is necessary to obtain the cross section for each position. Therefore, first, as shown in FIG. 7, some points are defined on the section c. In this _example, between the _{P a ~P b, P 1,} P 2, P 3, defines ... and point. The number of points may be appropriately determined in consideration of the resolution of the container design. Fig. 5 shows the cross section at P _a .
a flat ellipse (a), the cross section of P _b is a circle as shown in FIG. 5 (b). Point P between them
_The operation of step S5 is to calculate the cross-sections at ₁ , P ₂ , P ₃ , ...

First, in step S51, n equal divisions of the cross section for the constraint ranges on both sides are performed. Here, for convenience of explanation, n = 16 is set, but in practice, this division number is appropriately determined in consideration of the resolution of the container design. FIG. 8 shows a state where the equal division is performed. Fig. 8 (a) shows the constraint range a.
Is a diagram obtained by dividing the cross-section defined with respect to 16 into 16 equal parts, and the dividing points are represented as A ₁ , A ₂ , ..., and FIG. , And the division points are represented as B ₁ , B ₂ , ... The principle of the following calculation is that these corresponding dividing points (eg A ₁
And B ₁ ) are smoothly connected, and each cross section is obtained as a set of points on this line.

First, in step S52, equal division points are normalized. That is, the X-coordinate value and the Z-coordinate value of each division point in FIG. 8 (a) are multiplied by a constant coefficient so that the XZ-coordinate value of the point P _a becomes (1,0). As shown in FIG. 9, the XZ coordinate values of the respective division points after being normalized in this way are A ₁ (x _a1 , z _a1 ), A ₂ (x _a2 ,
z _a2 ), ... Exactly like the point P _b
8 (b) so that the XZ coordinate value of is (1, 0).
Normalization is performed by multiplying the X coordinate value and the Z coordinate value of each division point of 1 by a constant coefficient. X of each division point after normalization here
As shown in FIG. 10, the Z coordinate value is B ₁ (x _b1 , z
_b1 ), B ₂ (x _b2 , z _b2 ), ...

By using the coordinate values of the division points thus normalized, the coordinate values of the points forming the cross section at any position outside the constraint range can be obtained. Now, for example, in FIG. 7, considering the cross section (cross section along the Y = y _k plane) at the position of the k-th point P _k , the flat ellipse shown in FIG. 8 (a) and the flat ellipse shown in FIG. An ellipse (Fig. 11) having a flat shape in the middle of the circle shown is obtained. Points K ₁ (x _k1 , z _k1 , K ₂ (x _k2 , z _k2 ), which are obtained by dividing the ellipse into n equal parts,
It is step S53 to obtain the coordinate values of ...
Is the work of. Coordinate values (x _ki , y in the three-dimensional coordinate system of an arbitrary i-th point K _i (FIG. 11) divided into n equal parts
_ki , z _ki ) is given by the following equation.

_{x ki = D / C · (} x bi -x ai) + x ai (1) y ki = y k (2) z ki = D / C · (z bi -z ai) + z ai (1) wherein, x _ai and z _ai are as shown in FIG.
As shown in FIG. 10, the X and Z coordinate values, _i.e. , x _bi and z _bi of the i-th division point A _i of the cross section defined by the section a are the i-th of the cross section defined by the section b. Split point B
The X and Z coordinate values of _i , y _k are the Y coordinate values of the point P _k as shown in FIG. Further, D and C are the distances from the point P _a to the points P _k and P _b along the vertical section shown in FIG. 7, respectively. This distance is (the linear distance from Pa to P1) + (the linear distance from P1 to P2) + ...
Can be easily obtained by the calculation.

As described above, since the three-dimensional coordinate values of the arbitrary i-th division point forming the arbitrary k-th cross section are obtained, all necessary cross-sections can be obtained by calculation. In this embodiment, there is only one portion (section c in FIG. 4) for which the cross-section is calculated, but if there are multiple portions, step S6 returns to step S5 and the same calculation is repeated. It will be. The calculation outside the constraint range in step S5 is not limited to the method described in the above-mentioned embodiment, and in short, the longitudinal section data of that portion and the transverse section data of the constraint range on both sides thereof are obtained. Any method may be used as long as it is a calculation method capable of generating a smooth three-dimensional shape based on.

〔The invention's effect〕

As described above, according to the three-dimensional container designing apparatus of the present invention, the designer only needs to design the vertical section and the horizontal section separately on the two-dimensional plane, and the section where the horizontal section is not uniquely determined is calculated. Since the cross section is generated, the design is very easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a three-dimensional container designing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a concrete example of a three-dimensional container designed by the apparatus shown in FIG.
FIG. 4 is a flow chart showing the procedure for designing a three-dimensional container by the device shown in FIG. 1, FIG. 4 is a diagram showing the input state of the longitudinal section input means in the device shown in FIG. 1, and FIG. 5 is the device shown in FIG. 6 is a diagram showing an input state of the cross-section input means in FIG. 6, FIG. 6 is a diagram showing a simple input method of the cross-section input means in the apparatus shown in FIG. 1, and FIG. 7 is a cross-section generation in the apparatus shown in FIG. FIG. 8 is a diagram showing the position, FIG. 8 is a diagram showing equal division of the transverse section defined in the apparatus shown in FIG. 1, FIGS. 9 to 10 are enlarged views of the transverse division, and FIG. It is an enlarged view of the cross section obtained by. 1 ... Longitudinal section input means, 2 ... Restraint range input means, 3 ...
... cross-section input means, 4 ... storage device, 5 ... out-of-constraint range calculation means, 6 ... display device.

Claims (3)

[Claims] 1. A vertical cross-section input means for inputting a vertical cross-section of a three-dimensional container to be designed as a plane figure on an XY plane, and a portion of the vertical cross-section having a Y coordinate value within a predetermined range is defined as a constraint range. Constraint range input means, a cross-section input means for inputting a cross-section of a three-dimensional container as a plane figure on the XZ plane for the defined constraint range, and a memory for storing data input by the three input means Device and constraint for a part outside the constraint range that does not belong to the constraint range, based on longitudinal cross-section data of the part and transverse cross-section data of the constraint range on both sides of the part, to obtain a cross-section of the part by calculation An out-of-range calculation means, and a display device for displaying an input result by the three input means and an operation result by the out-of-constraint range calculation means. Designing apparatus of the three-dimensional container to. 2. The three-dimensional container designing apparatus according to claim 1, wherein the out-of-constraint-range computing means divides the cross-sections of the restraint range on both sides of the part to which the desired cross-section belongs, into n equal parts, respectively. A designing device characterized by obtaining a cross section as a set of points on a line smoothly connecting equally divided points. 3. The three-dimensional container designing apparatus according to claim 1 or 2, wherein the cross-section input means selects means for selecting data of a pre-defined basic figure, and a magnification factor of the selected basic figure. And a unit for generating a deformed figure.