JP3610130B2 - Information processing method and apparatus, and computer control apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information processing method and apparatus for drawing a three-dimensional scene by computer graphics technology, and a computer control apparatus.
[0002]
[Prior art]
In drawing a three-dimensional scene by computer graphics, there is a method in which a surface shape is expressed using a polygon and a texture image is pasted on the polygon to draw a pattern on the surface. As a method for acquiring a texture image used in such computer graphics, the following method is generally known.
[0003]
A part to be used as a texture image is designated by a rectangle from the texture original image and cut out to prepare a texture image. Next, a corresponding position of the texture image is input to each vertex of the polygon to which the texture image is pasted. Based on the input position information, the texture image is attached to the polygon.
[0004]
[Problems to be solved by the invention]
However, since the texture image is cut out by a rectangle in the above-described conventional technique, it is very troublesome to give the position of each vertex to the polygon when the shape of the polygon to be pasted is not a rectangle. For example, when a part of a texture image cut out in a rectangle as shown in (b) is pasted on a polygon having vertices a to h as shown in (a) of FIG. 5, the following procedure is required. In other words, the corresponding positions a ′ to h ′ (positions indicated by ●) in the texture image are represented by the normalized coordinate values in the rectangle at the respective vertices a to h (points indicated by ●) of the polygon. Must be granted. Here, the normalized coordinates are coordinate values normalized so that each vertex of the rectangle is indicated by (0, 0), (1, 0), (1, 1), (0, 1), respectively. It is.
[0005]
As described above, according to the conventional method, since the user inputs the position indicating each position on the texture image with the coordinate value for each vertex on the polygon image, the operation is very troublesome.
[0006]
The present invention has been made in view of the above problems, and automatically associates the position of a point designated on a polygon image with the position of a point designated on a texture original image including a necessary texture image. It is an object of the present invention to provide an information processing method and apparatus that make it possible to easily apply a texture image to a polygon.
[0007]
In addition, the present invention makes it possible to interactively generate computer graphics data having a texture from an image in which a polygonal area is appropriately contained in the image without easily making a texture image matched to the polygon in advance. It is an object of the present invention to provide an information processing method and apparatus.
[0008]
[Means for Solving the Problems]
The information processing apparatus of the present invention that achieves the above object has the following configuration. That is,
First display means for displaying a polygon image composed of one or a plurality of polygons on a display screen ;
Second display means for displaying a texture original image including a texture image to be used on the display screen together with the polygon image displayed by the first display means; a polygon of the polygon image displayed by the first display means; Designating means for designating an upper point and a point on the texture original image displayed by the second display means to be associated with the upper point;
An assigning means for assigning position information of a point associated on the texture original image to each of the points designated on the polygon image by the designation means;
Polygon data in which position information of corresponding points on the texture original image is assigned to points on the polygon by the assigning means, and output means for outputting the texture original image as drawing data.
[0009]
Preferably, the point on the polygon designated by the designation means is each vertex of the polygon to which the texture image is pasted.
[0010]
Preferably, the designating unit includes a first designating unit that designates one or a plurality of polygons to which the texture image is to be pasted, and one or a plurality of polygons designated by the first designating unit. Third display means for extracting and displaying as a polygon image, and second designation means for designating each vertex of the polygon displayed by the third display means and a corresponding point in the texture image are provided. Since the polygon to which the texture is to be pasted is extracted and displayed, the texture to be pasted becomes clear and the apex and the like can be specified more easily.
[0011]
Preferably, the image processing apparatus further includes a cutting out unit that cuts out a region including the point specified by the specifying unit as a texture image from the texture original image displayed by the second display unit, and the adding unit includes the specifying unit by the specifying unit. Position information of the corresponding point on the texture image cut out by the cutout unit is assigned to each point specified on the polygon image, and the output unit adds the texture to the point on the polygon by the adding unit. Polygon data to which position information of corresponding points on the image is assigned and the texture image are output as drawing data. It becomes possible to cut out the texture image from the texture original image, it is possible to obtain a texture image that does not include an extra portion as much as possible, and to reduce the size of the texture data.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is a block diagram illustrating a schematic configuration of an information processing apparatus according to the present embodiment. In the figure, reference numeral 101 denotes a CPU which executes various processes including the procedure of this embodiment. A memory unit 102 includes a ROM 102a that stores a control program describing a procedure executed by the CPU 101, and a RAM 102b that provides a work area when the CPU 101 executes various processes. Reference numeral 103 denotes an external memory that stores data to be processed such as polygon data, texture original images, texture data, and the like. An input / output interface 104 inputs / outputs data to be processed from the outside of the apparatus. For example, the input / output interface 104 realizes connection with a scanner for reading a texture original image.
[0014]
Reference numeral 105 denotes a keyboard which performs various inputs such as data selection. Reference numeral 106 denotes a pointing device, which uses a mouse in this embodiment, and designates a desired position on the display device 107. Reference numeral 107 denotes a display device that displays a processing status, a processing result, a processing process, and processing data. The display device 107 is display-controlled by a window system to realize multi-window display.
[0015]
Next, a process for pasting a texture image to a polygon in the information processing apparatus of the present embodiment having the above-described configuration will be described. FIG. 2 is a flowchart showing a processing procedure when a texture image is pasted on a polygon.
[0016]
In step S201, polygon data representing a three-dimensional shape is read through the input / output interface 104 and stored in the external memory 103 (polygon data 103a in FIG. 1). Polygon data can be created using an existing three-dimensional CAD tool or the like, and is data that represents a three-dimensional object or scene as a surface plate. The polygon data is data composed of a plurality of or one polygon.
[0017]
The polygon data is created in advance by a CAD system or the like and stored in a storage medium such as a floppy disk. For example, in the case of a floppy disk, polygon data is read using a floppy disk drive connected to the input / output interface 104. Note that polygon data may be created by executing an application such as CAD in the information processing apparatus. In this case, the created polygon data is directly stored in the external memory 103.
[0018]
In step S202, the texture original image is read. The texture original image is an image that is the basis of a texture to be pasted as a pattern on the surface of a polygon, and is a normal color image or grayscale image. In this step, as in step S201, input is performed through the input / output interface 104, and data is stored in the external memory 103 (texture original image 103b in FIG. 1). In this case, the input / output interface 104 is connected to, for example, a scanner that reads an image. Further, the texture original image read in this step is an image serving as the basis of the texture to be pasted on the polygon data read in step S201. Note that the texture original image stored in the external memory 103 may be plural or one.
[0019]
In step S203, polygon data is three-dimensionally drawn. In this step, first, one window is generated in the window system 107, and polygon data stored in 102 is drawn on the window as a three-dimensional scene. As a simple technique for drawing polygon data as a three-dimensional scene, for example, a technique of presenting an image that is projected on a plane to be projected on a window based on projective transformation of a polygon data at a three-dimensional position onto a two-dimensional plane is available. Can be mentioned. It should be noted that any other method may be used for drawing the polygon data.
[0020]
Next, in step S204, the mouse 106 is used to instruct a plurality or one polygon to which the texture is to be pasted from the polygon data drawn in step S203. An example of this is shown in FIG. FIG. 3 is a diagram illustrating a state of a display screen in the window system of the present embodiment. In FIG. 3, reference numeral 31 denotes a window displayed on the display device 107. In the window 31, three polygons in which polygon data is displayed three-dimensionally are interactively displayed in three windows. It shows how a polygon is selected. The selected polygon is displayed in a different color (indicated by hatching in FIG. 3). The polygon can be specified by moving the mouse cursor into a desired polygon area and clicking a mouse button.
[0021]
Next, in step 205, the polygon selected in step S204 is extracted and three-dimensionally drawn (see window 41 in FIG. 4). The three-dimensional drawing method is the same as in step S203. Further, the three-dimensional drawing image generated in this step is used for designating the vertexes of the polygon in the subsequent step S207.
[0022]
In step S206, a texture original image corresponding to the polygon selected in step S204 is selected from the texture original image group stored in the external memory 103, and a new window is displayed on the display device 107. Generate and display (see window 42 in FIG. 4). This is a step in which the operator selects a pattern to be attached to the polygon. In the window 42, a Japanese-style room is displayed as an original texture image. The texture original image shown in this window 42 is a color grayscale image.
[0023]
Next, in step S207, one vertex on the polygon drawn in the window 41 of FIG. 4 is designated using the mouse 106, and in step S208, a point on the texture original image corresponding to this vertex (hereinafter referred to as a corresponding point). The point is designated using the mouse 106. The processes in steps S207 and S208 are performed on all the vertices of the selected polygon (step S209). The relationship between the vertexes and the corresponding points for which the association is designated in the above process is stored in the external memory 103 as the corresponding point data 103d.
[0024]
FIG. 4 is a diagram illustrating a state in which the vertexes of the polygon and the corresponding points on the texture original image are designated. The extracted texture image is displayed in the window 41 of FIG. 4, and the texture original image (Japanese-style photographic image) is displayed in the window 42. As a result of designating the vertex of the polygon and the corresponding point in the texture original image (Each vertex and corresponding point are indicated by x). As a result, the corresponding point data is configured such that the corresponding point a ′ of the texture original image of the window 42 corresponds to the vertex a of the polygon image of the window 41 and the corresponding point b ′ similarly to the vertex b.
[0025]
Polygon vertices are not always associated with the entire image plane of the texture original image. For this reason, in step S210, an unnecessary area is cut out from the texture original image, and an image in the necessary area is cut out and stored as texture data in the external memory 103 (texture data 103c in FIG. 1). As a simple method of cutting out an image, there is a method of cutting out a rectangle including the image from a range on the image plane indicated by a point in the texture original image to which the vertex is associated. In the display example of the window 42 in FIG. 4, a rectangle including a quadrangle a′c′d′e ′ is cut out. Note that the rectangle to be cut out is desirably set so that the area thereof is minimized. This is because the size of the texture data can be further reduced.
[0026]
In step S211, position information of corresponding points in the cut texture image (texture data) is assigned to each vertex of the polygon. Since the corresponding point corresponding to each vertex is held as the corresponding point data 103d, it is only necessary to acquire the corresponding point with reference to this. Further, this position information indicates the position by an image coordinate value of the texture image, a value when the horizontal axis of the texture image is normalized (a value of 0 to 1), and the like. Polygon data in which information on each corresponding point in the texture image is added to each vertex is overwritten as polygon data 103a. Needless to say, polygon data with corresponding point information may be stored in a separate file.
[0027]
In step S212, the texture image and polygon data associated with the texture image are output as a result through the input / output interface 104.
[0028]
The user is inquired whether or not the processes in steps S203 to S212 are performed for other polygons. If the process is performed for other polygons, the process returns to step S203 (step S213). On the other hand, if there is an instruction to end the process, the process ends from step S213.
[0029]
Through the above procedure, it is possible to interactively associate polygon data representing only a three-dimensional shape with an image, and computer graphics data representing a surface pattern can be generated.
[0030]
[Other Embodiments]
(1) The step of outputting polygon data and texture data in step S212 may come after step S213.
[0031]
(2) The process of cutting out the texture data from the texture original image in step S210 is not limited to the method of cutting out a point on the image plane of the point in the texture original image associated with the vertex as a surrounding rectangle. Various methods are conceivable, such as generating rectangular texture data by linear or non-linear conversion.
[0032]
(3) There is a method in which step S204 and step S205 are omitted, and the polygon data created in step S203 is directly used in step S207. In this case, the polygon is not explicitly selected in advance, but the texture is attached to the polygon including the vertex selected for the association with the texture. For this reason, step S209 also verifies whether there are any vertices that are not designated among the polygons selected as vertices, rather than verifying whether the designation of vertices has been completed for all designated polygons. .
[0033]
(4) Although the mouse is used as the pointing device 106 in the above embodiment, the present invention is not limited to this. For example, it is obvious that a tablet or the like can be used.
[0034]
(5) In the above embodiment, a window system capable of displaying a plurality of windows is used as the display device 107. However, even if one screen can be used as only one window, within one screen (within a window). Can be substituted by dividing the display with.
[0035]
(6) In the above embodiment, the polygon data in which the corresponding point of the texture image is added to each vertex and the texture image are output via the input / output interface 104. In other words, these data can be stored in a storage medium such as a floppy disk or provided to an external device for drawing. However, as described above, since these data are also stored in the external memory 103, it is possible to perform drawing processing on the information processing apparatus using these data and display them on the display apparatus 107. Not too long.
[0036]
As described above, according to the present embodiment, it is possible to specify a position to be associated with each vertex of polygon data in the texture original image, and the polygon data to be pasted has a complicated shape. However, texture data can be pasted with a simple operation.
The object of the present invention achieved by the function of the above apparatus or the method can also be achieved by a storage medium storing the program of the above-described embodiment. That is, the storage medium is mounted on the apparatus and the program read from the storage medium achieves the new function of the present invention. In this case, if a floppy disk is taken as an example of the storage medium, the control program stored in the floppy disk is read from the floppy disk drive connected to the input / output interface 104 and loaded into the RAM 102b of the memory unit 102. And executed by the CPU 101. The structural features of the program according to the present invention are as shown in FIG.
[0037]
(A) of FIG. 6 is a figure showing the procedure of control by each processing module of this program. Reference numeral 61 denotes a first display process, which displays a polygon image composed of one or a plurality of polygons like a window 31. This process corresponds to step S203 described above. Reference numeral 62 denotes a second display process, which displays a texture original image including a texture image to be used like a window 42. This process corresponds to step S205 described above.
[0038]
Reference numeral 63 denotes a designation process that designates a point on the polygon of the polygon image displayed in the first display process 61 and a point on the texture original image displayed in the second display process 62 to be associated therewith. To do. In this process, the apex of the polygon on the window 31 and the corresponding point of the texture image on the window 42 are specified. As in the above embodiment, the pasted polygon is extracted and the window 41 is displayed. Then, apexes and corresponding points may be designated (steps S205 and S207 to S209).
[0039]
Reference numeral 64 denotes an adding process, in which position information on the texture original image of the corresponding corresponding point is assigned to each of the points specified on the polygon image in the specifying step (step S211). At this time, it is convenient to reduce the size of the texture data by cutting out a rectangular region having corresponding points from the texture original image as a texture image as in the above embodiment (step S210).
[0040]
Reference numeral 65 denotes an output process, in which polygon data in which position information of corresponding points on the texture original image is assigned to points on the polygon in the assigning process 64, and the texture original image are output as drawing data (step S212). .
[0041]
FIG. 6B shows an example of the storage state of the control program in the storage medium. Each control module shown by 61'-65 'contains the program code for performing the process shown by said 61-65.
[0042]
Further, the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Needless to say, the present invention can also be applied to a case where the present invention is achieved by supplying a program to a system or apparatus. In this case, the storage medium storing the program according to the present invention constitutes the present invention. Then, by reading the program from the storage medium to the system or apparatus, the system or apparatus operates in a predetermined manner.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to automatically associate the position of a point designated on a polygon image with the position of a point designated on a texture original image including a necessary texture image. Therefore, the operation of pasting the texture image onto the polygon becomes easy.
[0044]
Further, according to the present invention, it is possible to interactively generate computer graphics data having a texture from an image in which a polygon area is appropriately contained in the image without easily making a texture image matched with the polygon in advance. It becomes possible.
[0045]
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an information processing apparatus according to an embodiment.
FIG. 2 is a flowchart showing a processing procedure when a texture image is pasted on a polygon.
FIG. 3 is a diagram showing a state of a display screen in the window system of the present embodiment.
FIG. 4 is a diagram illustrating a state in which vertexes of a polygon and corresponding points on a texture original image are designated.
FIG. 5 is a diagram illustrating a general texture image acquisition method.
FIG. 6 is a diagram for explaining the configuration of a storage medium that stores a control program for realizing the control of the present embodiment;
[Explanation of symbols]
101 CPU
102 Storage device 2
103 storage device 1
104 I / O interface 105 Keyboard 106 Pointing device (mouse)
107 Display device (window system)

Claims (8)

First display means for displaying a polygon image composed of one or a plurality of polygons on a display screen ;
Second display means for displaying a texture original image including a texture image to be used on the display screen together with the polygon image displayed by the first display means;
Designating means for designating a point on the polygon of the polygon image displayed by the first display means and a point on the texture original image displayed by the second display means to be associated therewith;
An assigning means for assigning position information of a point associated on the texture original image to each of the points designated on the polygon image by the designation means;
Information comprising: polygon data in which position information of corresponding points on the texture original image is assigned to points on the polygon by the assigning means; and output means for outputting the texture original image as drawing data Processing equipment. The information processing apparatus according to claim 1, wherein the point on the polygon designated by the designation unit is each vertex of the polygon to which the texture image is pasted. The designation means is:
First designation means for designating one or a plurality of polygons to which the texture image is to be pasted;
Third display means for extracting one or a plurality of polygons designated by the first designation means and displaying them as polygon images;
The information processing apparatus according to claim 1, further comprising: second designation means for designating each vertex of the polygon displayed by the third display means and a corresponding point in the texture image. From the texture original image displayed by the second display means, further comprising a cutting means for cutting out a region including the point designated by the designation means as a texture image,
The assigning means assigns position information of a corresponding point on the texture image cut out by the cutout means to each of the points specified on the polygon image by the specifying means,
The output means outputs polygon data in which position information of corresponding points on the texture image is assigned to points on the polygon by the assigning means, and the texture image is output as drawing data. The information processing apparatus according to 1. A first display step for displaying a polygon image composed of one or a plurality of polygons on a display screen ;
A second display step of displaying a texture original image including a texture image to be used on the display screen together with the polygon image displayed by the first display step;
A designation step for designating a point on the polygon of the polygon image displayed in the first display step and a point on the texture original image displayed in the second display step to be associated with the polygon image;
An assigning step of assigning position information of the points associated on the texture original image to each of the points designated on the polygon image by the designation step;
Information comprising: polygon data in which position information of corresponding points on the texture original image is assigned to points on the polygon in the assigning step; and an output step of outputting the texture original image as drawing data Processing method. 6. The information processing method according to claim 5, wherein the point on the polygon designated in the designation step is each vertex of the polygon to which the texture image is pasted. The designation step includes
A first specifying step of specifying one or more polygons to which the texture image is to be pasted;
A third display step of extracting one or a plurality of polygons designated in the first designation step and displaying them as polygon images;
The information processing method according to claim 5, further comprising: a second designation step of designating each vertex of the polygon displayed in the third display step and a corresponding point in the texture image. From the texture original image displayed in the second display step, further comprising a cutting-out step of cutting out a region including the point designated in the designation step as a texture image,
In the assigning step, position information of a corresponding point on the texture image cut out in the cutout step is given to each of the points specified on the polygon image in the specifying step,
The output step outputs polygon data in which position information of corresponding points on the texture image is assigned to points on the polygon in the assigning step, and the texture image is output as drawing data. 5. The information processing method according to 5.

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