JPS62137673A - Three-dimensional graphic data display method and device - Google Patents

Abstract

PURPOSE:To intuitively and easily grasp a data by displaying the bit of depth information of one or more displayed three-dimensional object data on a scale. CONSTITUTION:A scale 12 which represents a depth range to the display screen 11 of a display objected space is provided at an edge part within a display screen 11 area. On the scale 12, markers 15 and 16 which represent the bits of depth information for one or more three-dimensional object data 13 and 14 displayed on the display screen 11 are displayed. The depth of the three- dimensional object data 13 and 14 can be read easily from the position relation of the markers 15 and 16.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and device for displaying three-dimensional graphic data in computer graphics, and particularly to a three-dimensional graphic display device using a display device such as a CRT display. The present invention relates to a method and apparatus for displaying three-dimensional graphic data that allows easy understanding of the three-dimensional positional relationship of the displayed three-dimensional graphic data when displaying graphic data.

[Conventional technology]

When three-dimensional graphic data is displayed on a display device such as a CRT display using a conventional graphic display device, the existing range in the depth direction with respect to the display screen of the data to be displayed, or the data selected as the operation target or As a means of informing the operator of the three-dimensional coordinate values of points, line segments, etc. that constitute the elements, or the three-dimensional coordinate values of the position pointed to by the cursor, a part of the display screen area on the display device is The coordinate values in the three directions of X, Y, and Z were displayed as a set of three numbers. This allows the operator to confirm the value in the depth direction of the three-dimensional figure data on the display screen, the extent of its existence, or the three-dimensional position of the cursor.

[Problem that the invention seeks to solve]

However, with such conventional methods and devices, all essential information is given as a sequence of numerical data, making it difficult to intuitively understand three-dimensional information and hindering the smooth operation of graphic display devices. It had become.

The object of the present invention is to determine the extent of the displayed data in the depth direction within the display space, the extent of the graphical data selected as the operation target in all displayed data, and the extent of the point indicated by the cursor. Information such as depth position, etc.
Easy to understand intuitively and improves the efficiency of figure processing 3
The object of the present invention is to provide a method and device for displaying dimensional graphic data.

[Means for solving problems]

In the method of the first invention, a scale is provided on one side of the edge in the display screen area to indicate the range of the display target space in the depth direction with respect to the display screen, and one or more three-dimensional object data being displayed The scale is configured by displaying a marker indicating depth information on the scale.

The device of the second invention includes a graphic memory that stores three-dimensional graphic data to be displayed, a frame buffer in which the graphic data is expanded, and a marker that is displayed on the display screen based on coordinate information in the depth direction of the graphic data to be displayed. a marker calculation circuit that calculates information, a coordinate conversion circuit that performs three-dimensional clipping processing and perspective transformation, and a display control circuit that reads out the marker information from the graphic memory and the marker calculation circuit as display data; a display circuit that develops the display data in the frame buffer and displays the data on a display section in synchronization with a refresh cycle; a display section that displays information in the frame buffer to an operator; 9 [Operation] In the three-dimensional graphic data display method and device of the present invention, a display screen is provided on one side of the edge of the display screen in the depth direction with respect to the display screen in the display target space. Displays a scale representing the scale, calculates the range in the depth direction of the 3D shape pig displayed on the display screen, and displays a marker representing the result and the range in the depth direction of the 3D shape data selected as the operation target. A marker representing the cursor displayed on the screen and a marker representing the coordinate value in the depth direction of the cursor displayed on the screen are displayed on the scale at the edge of the display screen. As a result, a display is realized in which the three-dimensional positional relationship of the three-dimensional graphic data displayed on the display screen can be easily grasped.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a display screen according to an embodiment of the first invention. Reference number 11 in the figure represents the display screen area of the display. In the three-dimensional graphic data display method of the first invention, first, one side of the display screen area is scaled 1 representing the depth of the display target space as shown by the large frame in FIG.
Set it to 2. In the example shown in FIG. 1, the upper side is the scale 12, but it may be on either the top, bottom, left or right sides. The range in the depth direction of the display space is associated with the length of one side of the display screen. At this time, in order to show the operator the range of coordinate values in the depth direction indicated by the scale 12, the coordinate values corresponding to both ends of the scale 12 are displayed at both ends of the scale 12 or at an arbitrary location on the display screen.

Further, in order to indicate to the operator the accuracy of the coordinate values that can be read from the scale 12, a scale or a ruler is displayed superimposed on the scale 12. Next, a case where two three-dimensional graphic data, a rectangular parallelepiped represented by reference number 13 and a pentagonal pyramid represented by reference number 14, are displayed on the minute screen will be described as an example. The range in the depth direction occupied by the rectangular parallelepiped 13 and the pentagonal pyramid 14 in the display space is calculated, and the range is calculated on the scale 12.
Display above. In FIG. 1, the marker 15 representing the range is displayed in the form of a rectangle represented by a diagonal line in the scale 12. The shape of the marker is not limited to a rectangle with diagonal lines, but it can be any shape that can indicate the range in the length direction of the side on a scale of 12", such as an arrow or a short line segment. .

Furthermore, in the example shown in FIG. 1, a case will be explained in which two internal pressure pyramids 14 of graphic data are selected as objects of processing.

Now, the range in the depth direction of the triangular pyramid 14 is calculated and displayed on the scale 12 using a marker different from the marker 15 as indicated by reference numeral 16. In this case, the above 2
It is clear that this becomes part of a marker that represents the range of data that exists. In the example of FIG. 1, it can be easily understood from the positional relationship between the markers 15 and 16 that the rectangular parallelepiped 13 is located further back toward the screen than the pentagonal pyramid 14.

Furthermore, an example is given of the case where a cursor with three-dimensional information is displayed and moved on the screen.9 In a display method using a normal display device, even if the cursor 17 has a value in the direction, the position information that can be read from the screen is It is only a two-dimensional value that corresponds to the display screen. However, by displaying a marker as shown by reference number 18 on the scale 12 at a position corresponding to the value in the depth direction, the position can be compared to the three-dimensional position information and the three-dimensional figure data displayed on the screen. Relationships can be easily read.

As explained above, according to the embodiment of the first invention, the DJ (* space, display data, and depth information of the cursor can be displayed on one side of the display surface as a marker on the scale, thereby creating a three-dimensional 7) Easy to grasp.

FIG. 2 is a block diagram showing an embodiment of the second invention.

The three-dimensional graphic data display device shown in FIG. 2 includes a control section 1, a display control circuit 2, a graphic memory 3, a display circuit 4, a coordinate conversion circuit 5, a frame buffer 6, a display section 7, and a marker calculation circuit. It is composed of a circuit 8. .

The display control circuit 2 receives a display instruction signal from the control unit 1 through a signal line 101 and reads out three-dimensional graphic data to be displayed from the graphic memory 3 through a signal line 102 7 Furthermore, the display control circuit 2 calculates markers through a signal line 103 circuit 8
A marker information signal for displaying depth information of the three-dimensional graphic data to be displayed at the edge of the display screen area is input from. These signal data are converted into the form of a drawing command for driving the display circuit 4, and the drawing command signal is outputted to the display circuit 4 through the signal line 104.

The graphic memory 3 is a memory that stores and holds three-dimensional graphic data to be displayed.

The display circuit 4 receives a drawing command signal given from the display control circuit 2 through a signal line 104 and generates image data to be observed by the operator through the display section 7. At this time, the three-dimensional graphic data is transferred to the coordinate conversion circuit 51\ through the signal line 105 in order to perform three-dimensional clipping processing and campaign conversion processing necessary for displaying the three-dimensional graphic data on the display screen.
The coordinate conversion circuit 5 outputs the created data as a result of processing by the coordinate conversion circuit 5 and inputs it through the signal line 106. The generated image data is written to the frame buffer 6 through the signal line 107. Furthermore, the display circuit 4 reads out the image data written in the frame buffer 6 as a video signal through a signal line 108 and outputs it to the display section 7 through a signal line 109.

The coordinate conversion circuit 5 converts the range of coordinate values including the depth direction of the display space stored in the marker calculation circuit 8 into a signal line for the drawing signal of the three-dimensional figure data given from the display circuit 4 through the signal line 105. The coordinate conversion circuit 5 performs three-dimensional clipping and perspective transformation processing while referring to the three-dimensional figure 110. The coordinate value of the data in the depth direction is output to the marker calculation circuit 8 through the signal line 111.

The frame bar sofa 6 is a memory that stores and holds data to be displayed in the form displayed on the screen.

The display unit 7 inputs the image data stored and held in the frame buffer 6 via the display circuit 4 and displays it on the screen.

The marker calculation circuit 8 is connected to the control unit 1 through a signal line 112.
Data representing the range of the data display space and data representing the display screen size are received and stored internally. Furthermore, the marker calculation circuit 8 calculates the position of the marker to be displayed on the display screen from the coordinate values in the depth direction of the three-dimensional figure data input from the coordinate conversion circuit 5 through the signal line 111, and displays the stored data. It is calculated based on data representing the spatial range and output as marker drawing data to the display control circuit 2 through the signal line 10B.

FIG. 3 is a diagram showing the circuit configuration of this marker calculation circuit 8 in detail. The marker calculation circuit 8 includes a Z register 81-1 and a Z2 register 81 that store and set the range of display space.
-2, a screen size setting register 82 for storing and setting the display screen size, a subtraction circuit 83, a division circuit 84, and a multiplication circuit 85. Coordinate values Z1 and Z2 indicating the range in the depth direction of the coordinate space to be displayed, which are given from the control unit 1 through the signal line 112, are sent to the Z register 81-1.2, respectively.
2 register 81-2. Z Lujistar 81-1
, Z2 register 81-2, the coordinate value data indicating the range in the depth direction of the coordinate space is supplied to the coordinate transformation circuit 5 through the signal line 110 and used for clipping and perspective transformation processing. Furthermore, the control unit 1 is connected to the signal line 112 minutes.
The display screen size given by is stored and set in the screen size setting register 82. When a three-dimensional depth direction coordinate value to be displayed as a marker is given from the coordinate conversion circuit 5 through the signal line 111, in the marker calculation circuit 8, it is input from the Z register 81-1 and the Z2 register 81-2 through the signal line 113. Coordinate values Z1 and Z2 indicating the range in the depth direction of the coordinate space are input to the subtraction circuit 83 to obtain the range of the space to be displayed. The value is output to the division circuit 84 through the signal line 114. In the division circuit 84, the signal line 1
11, the coordinate value in the depth direction of the three-dimensional graphic data given from the coordinate conversion circuit 5 is divided by the value obtained through the signal line 114, and the resulting value is outputted to the multiplication circuit 85 through the signal line 115. Since the value given by the signal line 115 only indicates the relative position information of the marker in the display space, the multiplication circuit 85 uses the signal line 11
6 inputs the display screen size stored in the screen size setting register 82, multiplies it with the value given by the signal line 115, and outputs it as marker drawing data to the display control circuit 2/\\ through the signal line 103.

As explained in the explanation of each circuit 2 to 8 above, the control circuit 1 gives commands and data to each circuit, controls the transmission and reception of data between each circuit, and transmits three-dimensional figure data and its depth direction information. Display processing is performed. In addition, the display control circuit 21 inputs a word representing the cursor position input through the signal line 113 from the information processing device connected to the outside of the data storage stored in the graphic memory 3 through the signal line 101.
By giving 3D graphic data, the depth information can be displayed in the form of a marker at the edge of the display area through the processing of the marker calculation circuit 8. 6 Of course, displaying it on the screen as a cursor is also possible through display control. This is performed by the operations of the circuit 2, display circuit 4, coordinate conversion circuit 5, frame buffer 6, and display section 7.

As explained above, according to the embodiment of the second invention, by having the marker calculation circuit, it is possible to realize the function of displaying a marker indicating the depth direction of the displayed three-dimensional figure data on a part of the display screen. I can do things.

The operation of the three-dimensional graphic data display device described above has been explained as being composed of circuit blocks that realize each process (carbonization), but the operation of the control section, display control circuit, coordinate conversion circuit, and marker calculation circuit (carbonization It is also possible to realize this using a microprocessor instead of each circuit block.

〔Effect of the invention〕

As explained above, the 3D graphic data display method and device of the present invention not only display image information obtained by perspectively converting 3D graphic data on the display screen, but also display information in the depth direction on the screen in the form of markers. It is possible to display the image on the edge in a form that is easy to appeal to people, and it has the effect of improving the efficiency of graphic processing that handles three-dimensional graphic data.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a display screen in an embodiment of the first invention, FIG. 2 is a block diagram showing an embodiment of the second invention,
FIG. 3 is a block diagram showing the marker calculation circuit of FIG. 2. DESCRIPTION OF SYMBOLS 1... Control part, 2... Display control circuit, 3... Graphic, memory, 4... Display circuit, 5... Coordinate conversion circuit,
6...Frame buffer, 7...Display section, 8...
Marker calculation circuit, 11... Display screen, 12... Scale, 13... Rectangular parallelepiped, 14... Pentagonal pyramid, 15.
16.18... Marker, 17... Cursor, 81
-1...Z register, 81-2...Z2 register,
82... Screen size setting register, 83... Subtraction circuit, 84... Division circuit, 85... Multiplication circuit. l'-.

Claims (5)

[Claims] (1) In a 3D graphic data display method in which 3D graphic data is displayed on the screen of a display device such as a CRT display, the depth direction of the display target space with respect to the display screen is placed on one side of the edge within the display screen area. A method for displaying three-dimensional graphic data, comprising: providing a scale indicating a range of data, and displaying a marker indicating depth information of one or more displayed three-dimensional object data on the scale. (2) A three-dimensional figure according to claim (1), characterized in that a marker indicating depth information of a cursor is displayed on a scale together with a marker indicating depth information of one or more three-dimensional object data. How to display data. (3) Claims (1) and (2) characterized in that the scale has graduations indicating accuracy.
3D figure data display method described in ). (4) A graphic memory that stores three-dimensional graphic data to be displayed, a frame buffer in which the graphic data is developed, and a marker that calculates marker information to be displayed on the display screen from the coordinate information in the depth direction of the graphic data to be displayed. a calculation circuit; a coordinate transformation circuit that performs three-dimensional clipping processing and perspective transformation; a display control circuit that reads graphic data from the graphic memory and marker information from the marker calculation circuit as display data; a display circuit that expands the display data and displays the data on a display unit in synchronization with a refresh cycle; a display unit that displays information in the frame buffer to an operator; and a display circuit that controls operations and signal exchange. A three-dimensional graphic data display device comprising a control section. (5) The coordinate information in the depth direction of the graphic data to be displayed includes the coordinate information in the depth direction of a particularly selected element of the graphic data and the cursor. Dimensional graphic data display device.