JPH11203487A - Fibrous texture, method and device for generating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily generate the image of fibrous texture in a short time by plotting a sphere with each coordinate position of a central line segment generated three-dimensionally as a center, and generating the image by performing rendering processing. SOLUTION: The required parameter for generating the fibrous texture is set (S1), next, the desired number of central line segments are three- dimensionally generated (S2), modeling is performed for each generated central line segment, and the shape of the fibrous texture is prepared. Namely, the sphere of radius is plotted with each coordinate position of each central line segment as a center (S3). Afterwards, rendering processing is performed for expressing the quantity of the surface of the fibrous texture (S4), and the image as the result of that rendering processing is outputted (S5). Thus, the image of the fibrous texture can easily be generated in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fibrous texture, a method for producing the same, and an apparatus for producing the same.

[0002]

2. Description of the Related Art A linear or curved pattern having a certain thickness, such as a thread-shaped, string-shaped or wire-shaped pattern (hereinafter referred to collectively as a fiber-shaped pattern). A pattern in which a number of textures are arranged is widely used as wallpaper, decorative paper, interior materials for automobiles, and the like. An example is shown in FIG. FIG. 6A is a pattern representing a state in which yarn waste is scattered and entangled, and FIG. 6B is a pattern representing a state in which a ring-shaped thread stands on the surface of a carpet or the like. Although not shown, a braided pattern can also be referred to as a kind of fibrous texture.

In order to generate such a fibrous texture, conventionally, for each fibrous texture, the shape at each position of the contour has been converted into data as structure data. However, such a method is extremely difficult to generate, not only takes time, but also imposes a heavy burden on the operator. In addition, the amount of data was enormous.

Therefore, an object of the present invention is to enable a fibrous texture to be easily and quickly generated.

[0005]

In order to achieve the above object, in the fibrous texture according to the present invention, a sphere is drawn around each coordinate position of a center line generated three-dimensionally. It is characterized by being generated by rendering processing.

Further, the method for generating a fibrous texture according to the present invention generates a center line segment having a desired shape three-dimensionally,
A sphere having a predetermined radius is drawn around each coordinate position of the center line.

Further, a fibrous texture generating apparatus according to the present invention includes a center line generating means for generating a center line having a desired shape three-dimensionally, and at least centering on each coordinate position of the center line. Parameter setting means for setting the radius of a sphere to be drawn, and lighting conditions when performing rendering processing,
Modeling means for drawing a sphere having a radius set by the parameter setting means around each coordinate position of the center line generated by the center line generation means and generating a fibrous texture, and a fiber generated by the modeling means Rendering means for performing rendering processing on the shape texture based on the lighting conditions set by the parameter setting means.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a processing flow of an embodiment of a fibrous texture generation method according to the present invention.

First, parameters necessary for generating a fibrous texture are set (step S1). In this step, as initial settings, a size of a fibrous texture image to be finally created, a size of a three-dimensional space for generating a center line described later, a radius of a sphere drawn on the center line, rendering Various parameters such as a parameter relating to an illumination condition used in the processing and a parameter relating to a light reflection condition of the fibrous texture are set.

Next, a center line segment is generated (step S).
2). The method of generating the center line segment is arbitrary. For example, an operator can manually draw an arbitrary straight line or curve in the set three-dimensional space. Also,
A plurality of points may be set at arbitrary positions in the three-dimensional space, and a curve connecting these points smoothly may be generated using a spline function. An example of the latter is shown in FIG. In FIG. 2, P ₁ (x ₁ , y ₁ , z ₁ ), P ₂ (x ₂ ,
y ₂ , z ₂ ), P ₃ (x ₃ , y ₃ , z ₃ ), P ₄ (x ₄ , y ₄ ,
An example is shown in which five points of z ₄ ) and P ₅ (x ₅ , y ₅ , z ₅ ) are taken, and a spline function is applied to these five points to generate a smooth curve L. Note that the method of generating the center line segment is not limited to the two methods described above, and other methods may be employed. Further, if necessary, the generated center line segment may have a fluctuation.
In order to make the center line segment fluctuate, for example, the coordinate value of each position of the center line segment may be changed by a random number.
Thus, for example, the center line segment shown in FIG. 3A can have a fluctuation as shown in FIG. 3B. In the case where the center line has a fluctuation as described above, it is naturally necessary to define a random number to be generated in advance in step S1.

In this way, a desired number of center line segments are generated, and the coordinate values of each position are taken in for each of the generated center line segments. Therefore, data on one center line segment is formed by the number of coordinates at each position and a three-dimensional coordinate value group at each position.

After a desired number of center line segments have been generated in this way, modeling is performed for each center line segment.
The shape of the fibrous texture is created (step S3).
Specifically, a sphere having the radius set in step S1 is drawn around each coordinate position of each center line. The concept is shown in FIG. In FIG. 4, from one end point of the center line segment L,
A state where six spheres are drawn around each coordinate position of the center line is shown. The straight line or the curve generated in step S2 is mathematically a line segment, but as described above, a sphere is drawn centering on each coordinate position of the straight line or the curve. -ing Note that the radius of the sphere may be constant, may be larger at the center of the center line, and may be smaller toward the end.

After the shape of the fibrous texture is generated by performing modeling as described above, a rendering process is then performed to express the texture of the surface of the fibrous texture. In this rendering process, a two-dimensional image viewed from the line-of-sight direction is set based on the parameters such as the direction and intensity of the illumination including the light source and the environment light, the reflection coefficient and color of the surface of the fibrous texture, and the line-of-sight direction set in step S1. The color and brightness at each position on the plane are calculated and obtained. Such a process is the same as that generally called a shading process, and is a method widely used in three-dimensional CG (computer graphics). Then, the color and brightness at each position on the two-dimensional plane obtained by the calculation are written to the corresponding position in the memory having the size of the fibrous texture image set in step S1.

Next, an image resulting from the rendering is output (step S5). This corresponds to step S4
The data is read from the memory in which the color and brightness data at each position on the two-dimensional plane obtained as a result of the rendering process are written, and an appropriate output device, for example, a color printer or a film output machine or a direct printing machine And the like.

Therefore, in the process of generating the center line segment in step S2, if a center line segment as shown in FIG. 6A is generated, a fibrous texture expressing a state where yarn waste is scattered and entangled is obtained. By generating a center line as shown in FIG. 6B, it is possible to obtain a fibrous texture that expresses a state in which ring-shaped yarns stand on the surface of a carpet or the like.

As described above, according to the method for generating a fibrous texture, the fibrous texture can be easily formed.
It can be generated in a short time. The data for one fibrous texture is represented by the number of coordinates at each position of the center line, a group of three-dimensional coordinates at each position, and the radius of a sphere drawn around each position of the center line. As a result, since it is not necessary to convert the shape of each fibrous texture at each position of the contour into structural data as in the related art, the data amount can be significantly reduced. .

An embodiment of the method for generating a fibrous texture according to the present invention has been described above. Next, an apparatus for generating a fibrous texture according to the present invention will be described with reference to FIG.

The fibrous texture generating apparatus includes a parameter setting unit 1, a center line segment generating unit 2, a modeling unit 3, a rendering unit 4, and an image output unit 5.

The parameter setting means 1 is for executing step S1 of FIG. Center line segment generating means 2
Is for executing step S2 in FIG.
A three-dimensional space can be set, a function of manually drawing an arbitrary straight line or curve on the three-dimensional space, and / or setting some points at arbitrary positions on the three-dimensional space, and setting those points Has the function of connecting smoothly. The modeling unit 3 captures the radius of the sphere set by the parameter setting unit 1 and the center line generated by the center line generation unit 2, and sets the radius set at each coordinate position of the center line as a center. Has the function of drawing a sphere and creating the shape of a fibrous texture.

The rendering means 4 includes the modeling means 3
And expresses the texture of the surface of the fibrous texture created in step (1). Based on the lighting conditions set by the parameter setting means 1, the conditions of the surface of the fibrous texture, and the like, the processing in step S4 described above is executed. .

The respective components of the parameter setting means 1, the center line segment generating means 2, the modeling means 3, and the rendering means 4 are all constructed using a computer. The computer will generate an image of the fibrous texture.

The image output means 5 outputs the image of the fibrous texture output from the rendering means 4 in this way. Specifically, for example, a color printer,
It consists of a film output machine, a direct printing machine and the like.

With the above configuration, an image of a fibrous texture can be created easily and in a short time.
It will be apparent that the burden on the operator can be greatly reduced as compared with the related art.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
The present invention can be implemented in various other modes.

[Brief description of the drawings]

FIG. 1 is a flowchart showing processing of an embodiment of a method for generating a fibrous texture according to the present invention.

FIG. 2 is a diagram for explaining an example of a method of generating a center line segment in step S2 of FIG.

FIG. 3 is a diagram for explaining an example of a technique for giving fluctuation to a center line segment.

FIG. 4 is a diagram for explaining an example of a modeling process in step S3 of FIG. 1;

FIG. 5 is a diagram showing an embodiment of a fibrous texture generating apparatus according to the present invention.

FIG. 6 is a diagram illustrating an example of a fibrous texture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Parameter setting means 2 ... Center line generation means 3 ... Modeling means 4 ... Rendering means 5 ... Image output means

Claims (3)

[Claims] 1. A fibrous texture, wherein a sphere is drawn centering on each coordinate position of a three-dimensionally generated center line, and further subjected to a rendering process to generate a fibrous texture. 2. A method for generating a fibrous texture, comprising: generating a center line having a desired shape three-dimensionally; and drawing a sphere having a predetermined radius around each coordinate position of the center line. 3. A center line segment generating means for generating a center line segment of a desired shape three-dimensionally, at least a radius of a sphere drawn around each coordinate position of the center line segment, and a case where rendering processing is performed. Parameter setting means for setting lighting conditions; modeling for drawing a sphere having a radius set by the parameter setting means around each coordinate position of the center line generated by the center line generation means to generate a fibrous texture And a rendering means for performing a rendering process on the fibrous texture generated by the modeling means on the basis of the lighting conditions set by the parameter setting means.