JPH07182541A - Preparing method for three-dimensional model - Google Patents

Abstract

PURPOSE:To prepare an inexpensive three-dimensional model in a few days of preparation while reducing a cost and time required for work by laminating the plural film-shaped members of prescribed scales based on specified second two-dimensional data and a pitch. CONSTITUTION:First two-dimensional data composed of plural contour lines expressing the unevenness of a three-dimensional shape are converted to three- dimensional data. Next, the three-dimensional shape expressed by these three- dimensional CAD data is sliced at prescribed pitches in a height direction and plural pieces of two-dimensional data at respective heights are generated. In this case, the interval of contour lines 2 on a white map 1 is optimumly adopted as a pich, however, when the pitch is wider than this interval, any pitch suitable as the three-dimensional model to be prepared may be selected. Further, plural film-shaped members 7 of prescribed scales are generated based on the respective two-dimensional data and pitches at each height and by successively laminating these film members, the three-dimensional model, namely, a three-dimensional map is prepared.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional model creating method, and more particularly to a three-dimensional model creating method for reading a three-dimensional unevenness as a contour line by a scanner and creating a three-dimensional model based on this information.

[0002]

2. Description of the Related Art As a three-dimensional model of a three-dimensional object whose shape features are represented by contour lines, there is a three-dimensional map that three-dimensionally represents the unevenness of the terrain. Conventionally, when creating a three-dimensional map, an aerial photograph taken from the sky by an aircraft or the like is analyzed to convert the unevenness of the ground surface into three-dimensional point sequence data consisting of fine lines and their intersections, and this is converted into a three-dimensional The three-dimensional model, that is, a three-dimensional map is created by reading in CAD, generating surface information including lines and intersections, and further generating solid information without disambiguation from this surface information.

[0003]

Therefore, in such a conventional three-dimensional model creating method, a three-dimensional object, for example, unevenness of the ground surface is converted into three-dimensional point sequence data consisting of fine lines and their intersections, and this is converted into three-dimensional data. Since it is designed to read surface information and solid information consisting of lines and intersections into a three-dimensional CAD, enormous cost and time are required for these operations, and the created three-dimensional model is also expensive. There was a problem that

There is also a computer which uses an image scanner to read a map into a personal computer (for example, Japanese Patent Laid-Open No. 1-194075), which displays the read image as it is on the screen as the following figure. Although the image data is subjected to processing such as scale conversion, the method of creating the three-dimensional model is not described.

The present invention is intended to solve such a problem, and it is possible to reduce the cost and time required for the work, and to create an inexpensive 3D model in a small number of creation days. It is intended to provide a way.

[0006]

In order to achieve such an object, a method of creating a three-dimensional model according to the present invention is a method of converting three-dimensional first two-dimensional data consisting of a plurality of contour lines showing unevenness of a three-dimensional shape. Data is converted, and the three-dimensional shape based on the three-dimensional data is sliced in the height direction at a predetermined pitch to generate a plurality of second two-dimensional data at each height based on the pitch. A three-dimensional model is created by stacking a plurality of film-shaped members of a predetermined scale based on the dimensional data and the pitch.

Further, as the first two-dimensional data, a drawing such as a blank map in which a plurality of contour lines are drawn is read as dot data by a scanner device, the dot data is converted into vector data, and the vector data is edited as necessary. It is generated by doing.

The first two-dimensional data is read as vector data of a plurality of contour lines showing unevenness of a three-dimensional object by measuring a three-dimensional object such as a natural modeling object or an industrial product with a three-dimensional scanner device, and if necessary, It is generated by editing the vector data.

[0009]

Therefore, the first two-dimensional data composed of a plurality of contour lines showing the three-dimensional unevenness is converted into three-dimensional data,
A three-dimensional shape based on this three-dimensional data is cut at a predetermined pitch in the height direction, a plurality of second two-dimensional data at each height based on the pitch is generated, and based on each second two-dimensional data and pitch. A three-dimensional model is created by stacking a plurality of film-shaped members of a predetermined scale.

Further, as the first two-dimensional data, a drawing such as a blank map in which a plurality of contour lines are drawn is read as dot data by a scanner device, and this dot data is converted into vector data, and if necessary, vector data. Is generated by editing.

Further, the first two-dimensional data is read as vector data of a plurality of contour lines showing unevenness of a three-dimensional object by measuring a three-dimensional object such as a natural modeling object or an industrial product with a three-dimensional scanner device, and if necessary, It is generated by editing the vector data accordingly.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing the procedure of a method for creating a three-dimensional model using a scanner according to an embodiment of the present invention. Hereinafter, a method for creating a three-dimensional model will be described by taking a case of creating a three-dimensional map based on a blank map as an example. explain.

FIG. 2 is an explanatory view showing a white map in which the unevenness of the terrain is shown by a plurality of contour lines 2. In FIG. 2, 3 is a disconnection portion where the contour line 2 is broken due to uneven printing or scratches. Is a changed portion whose topography has been changed due to large-scale civil engineering work, and 6 is change information indicating the contour lines after the changed portion 5.

First, the blank map 1 is read by a scanner (step 11). Here, the data indicating the contour lines read by the scanner is dot data composed of fine pixels based on the reading resolution of the scanner,
In order to recognize this as a line, it is converted into vector data by a known raster vector conversion technique (step 1
2).

Next, this vector data is converted into a two-dimensional CAD.
Read in and check if all contour lines 2 are continuous. Here, if there is a disconnection section 3 or the like, it is connected by various editing functions of the two-dimensional CAD, and if there is a change in the terrain, this changed section 5 is added to the separately read change information 6. Substitution is performed to generate two-dimensional CAD data (step 13).

Further, this two-dimensional CAD data is converted into three-dimensional CAD data (step 14). This conversion processing is performed by commercially available software for converting three-dimensional CAD data (for example, “SOLID CONSTRUCTURE” manufactured by CORETECH International, USA).

FIG. 3 is an explanatory diagram showing a three-dimensional shape expressed based on the generated three-dimensional CAD data, and based on the two-dimensional CAD data edited and showing perfect contour lines, there is no ambiguity. The dimensional shape has been output.

Next, the three-dimensional shape represented by the three-dimensional CAD data is sliced or sliced at a predetermined pitch in the height direction to generate a plurality of two-dimensional data at each height (step 15). The pitch in this case is optimal if the contour intervals of the contour lines 2 on the blank map 1 are optimal, but if it is equal to or greater than this contour line interval, it is possible to select an appropriate pitch as a three-dimensional model to be created.

Further, each of the two at each height
Based on the dimension data and the pitch, a plurality of film-shaped members 7 of a predetermined scale are generated, and these are laminated in order to obtain 3
A three-dimensional model, that is, a three-dimensional map is created (step 1)
6). FIG. 4 is an explanatory view showing the created three-dimensional map, and 7 is a film-shaped member.

Actually, a photo-curing resin (eg, epoxy resin, epoxy acrylate resin, or urethane acrylate resin) is put in a tank and a part of the liquid surface is irradiated with a laser beam based on two-dimensional data. The resin is cured to produce the film-shaped member 7, and then the liquid surface is moved up or down to produce the film-shaped member 7 having a different shape. By repeating this, the film-shaped members 7 are laminated. A three-dimensional map is created by a stereolithography method that creates a three-dimensional model.

Further, these film-like members 7 may be produced by cutting the paper based on the two-dimensional data at each height and superposing them on the thickness according to the pitch scale. Various methods can be used depending on the application and material.

Therefore, a three-dimensional map is created by reading a white map, which is a printed matter, with a scanner, converting it into vector data, and performing a predetermined data conversion process. In order to generate data showing a three-dimensional shape, In particular, the process of converting point and line information, which is a complicated and enormous amount of processing, into surface information and further solid information is not required, and the work required for creating a three-dimensional model is reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart showing a procedure for copying a three-dimensional object to create a three-dimensional model.
In the above description, a three-dimensional model is used as an example of a three-dimensional map, but a case where a natural shaped object, for example, the shape of a flower is three-dimensionally copied will be described.

First, the shape of a flower is measured by a three-dimensional scanner device using laser light (step 5).
1). This is to irradiate a measurement object with a laser beam and measure the three-dimensional shape by the difference in the propagation time of the reflected light, and the output in this case is not the sequence data but the vector data showing the contour lines.

This vector data is read into the two-dimensional CAD, and data editing such as changing the shape is performed as needed (step 52). This makes it possible to positively change the shape of the natural model.

Thereafter, as in the above, the edited two-dimensional C
Convert AD data to 3D CAD data (Step 5
3) Slice the three-dimensional shape represented by this three-dimensional data in the height direction at a predetermined pitch to obtain 2 at each height.
After the dimensional data is generated (step 54), a plurality of film-shaped members 7 are generated based on the two-dimensional data at each height and the three-dimensional model is created by stacking them (step 55).

Therefore, a three-dimensional object is read by a scanner, converted into vector data, and subjected to predetermined data conversion processing, whereby a three-dimensional model in which the original three-dimensional object is copied is created, and a three-dimensional shape is created. In order to generate the data shown, a process of converting point and line information, which is a particularly complicated and enormous process, into surface information and further solid information is unnecessary, and the work required for creating a three-dimensional model is reduced.

In the above description, the case where a natural shaped object is used as the original three-dimensional object has been described, but this may be, for example, an industrial product or a machine part, and by using the present invention as the copy source. It becomes possible to create a three-dimensional model at the time of designing these shapes in a short time and at low cost, and it is possible to significantly shorten the development period of the industrial product and reduce the development cost.

[0029]

As described above, according to the present invention, the first two-dimensional data composed of a plurality of contour lines showing unevenness of a three-dimensional shape is converted into three-dimensional data, and the three-dimensional shape based on the three-dimensional data is converted. A plurality of second two-dimensional data at each height based on the pitch is generated by slicing at a predetermined pitch in the height direction, and a plurality of film-shaped members having a shape based on each of the second two-dimensional data and the pitch are generated. Since the three-dimensional model is created by stacking, the cost and time required for the three-dimensional model creation work can be reduced, and the inexpensive three-dimensional model can be created in a small number of creation days.

As the first two-dimensional data, a drawing such as a blank map in which a plurality of contour lines are drawn is read as dot data by a scanner device, converted into vector data, and the vector data is edited as necessary. Since it is generated by such a method, it is possible to create a three-dimensional model in a short period of time and with a small cost even from an existing drawing in which unevenness of a three-dimensional shape is represented by contour lines.

Further, the first two-dimensional data is read in as vector data of a plurality of contour lines showing unevenness of a three-dimensional object by measuring a three-dimensional object such as a natural modeling object or an industrial product with a three-dimensional scanner device, and if necessary, Since it is generated by editing the vector data accordingly, it becomes possible to create a three-dimensional model at the time of designing these shapes at a low cost in a short time.
It is possible to significantly shorten the development period of industrial products and reduce development costs.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method of creating a three-dimensional model according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a blank map in which unevenness of the terrain is shown by contour lines.

FIG. 3 is an explanatory diagram showing a three-dimensional shape expressed based on three-dimensional CAD data.

FIG. 4 is an explanatory diagram showing a created three-dimensional map.

FIG. 5 is a flowchart showing a procedure for creating a three-dimensional model by copying a solid.

[Explanation of symbols]

 1 White map 2 Contour line 3 Broken line 5 Modified part 6 Modified information 7 Membrane member

Claims (3)

[Claims] 1. A method of creating a three-dimensional model, wherein first two-dimensional data consisting of a plurality of contour lines showing unevenness of a three-dimensional shape is converted into three-dimensional data, and the three-dimensional shape based on this three-dimensional data is height-converted. By slicing at a predetermined pitch in the direction to generate a plurality of second two-dimensional data at each height based on the pitch, and at a predetermined scale based on the second two-dimensional data and the pitch, a plurality of film-shaped members. A method for creating a three-dimensional model, characterized in that a three-dimensional model is created by stacking layers. 2. The method for creating a three-dimensional model according to claim 1, wherein the first two-dimensional data is obtained by reading a drawing such as a blank map in which a plurality of contour lines are drawn as dot data by a scanner device, Is converted into vector data, and the vector data is edited as needed to generate the three-dimensional model. 3. The method for creating a three-dimensional model according to claim 1, wherein the first two-dimensional data is obtained by measuring a three-dimensional object such as a natural modeling object or an industrial product with a three-dimensional scanner device. The method for creating a three-dimensional model is characterized in that the vector data is read as vector data of a plurality of contour lines indicating, and is generated by editing the vector data as needed.