JPH02183376A - Graphic processing system - Google Patents

Abstract

PURPOSE:To discriminate the bending, straight line and circular arc parts from each other and to produce a dot train connection curve by adding the restricted dot attribute to the dot group data to characterize the bending part as well as the accurate circular arc and straight line. CONSTITUTION:A restricted dot attribute editing means 3 adds or deletes the restricted dot attribute to or from a defined component dot by means of a mouse, an editor, etc. A dot train connection curve generating means 4 produces a dot train connection curve based on the continuance of the restricted dot attribute adding point. Thus the restricted dot attribute can be pointed at definition of the dot group data. Thus it is possible to define the feature points (dots showing a bending part, a straight line and a circular arc) of a shape and to quickly and accurately obtain a desired shape. In addition, the shape can be edited even after the dot group data is defined since the restricted dot attribute can be edited. Thus a shape is flexibly edited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a graphic processing method in a CAD/CAM system.

[Prior art] Figure 7 is a conceptual diagram explaining a conventional figure processing method that defines a shape based on the definition of point cloud data. A point cloud definition means for inputting point cloud data to be defined as a set of points, such as a three-dimensional measuring device, a manual means using an automatic programming language, an input means using CAD, etc. In addition, (5) shows a point sequence connection curve generation means for generating point sequence connection curve data (8) of a curve connecting point sequences from the point group data (7) stored in the database, and points from the point coordinate group. When defining a column connection curve to generate shape data, first define the point group data (7) with the point group definition means (1), and then define the point group data (7) with the point group definition means (1).
5), a point sequence connection curve (8) is generated.

[Problem to be solved by the invention]

However, in the conventional graphic processing method described above,
The point sequence connection curve generation means (5) that generates shape data from point group data generates shape data of a point sequence connection curve only from the position coordinates of the constituent points as described later, and However, there was a problem in that accurate arcs and straight lines could not be easily generated. For example, in the two-arc method, a point sequence connection curve, which is a smooth curve passing through a series of points, generally connects two adjacent points of a given point group with two arcs, and each It is approximated by a series of circular arcs in which the arcs touch each other, but in this method between two circular arcs, the connecting point of the two circular arcs is determined from the tangent vector of each point and the positional coordinates of the constituent points, and the constituent points that are tangent to the tangent vector are It is necessary to generate two circular arcs that pass through the connecting point, and the method of obtaining the tangent vector and the locus of the connecting point of the two circular arcs by interpolating between the two points is particularly complicated.

This invention was made in order to solve the problems of the conventional methods as described above, and it is a graphic processing method that can characterize point cloud data as points representing bends, accurate arcs, and straight lines. The purpose is to obtain.

[Means to solve the problem]

A graphic processing method according to the present invention is a graphic processing method that defines point cloud data and generates shape data, and includes: a point cloud definition means that defines the point cloud data and stores it in a database;
a point cloud editing means for editing point cloud data; and a point cloud editing means for specifying constraint point information at a specified point in the point cloud data, storing the defined point cloud data with constraint point information in the database, and storing the point group data with constraint point information in the database. a constraint point attribute editing means for editing the group data; a point series connection curve generating means for generating a point series connection curve from the point group data in the database and storing the point series connection curve in another database; and a constraint point It is equipped with another point connection curve generation means that generates a point sequence connection curve from the continuity of point cloud data with information and stores it in another database, and when defining and editing point cloud data, it can specify and specify constraint information. This method generates a point sequence connection curve from point group data that can be edited and has constraint point information added.

[Effect]

The graphic processing method in this invention adds constraint point attributes that characterize bent parts, accurate arcs, and straight lines to point cloud data,
A point sequence connection curve is generated by distinguishing bent parts, straight parts, and circular arc parts based on the continuity of points with constraint point attributes.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the configuration of FIG. 1, in which the same parts as in FIG. 7 are denoted by the same reference numerals. In FIG. 1, (2) is a point group editing means for editing a point group in order to change the coordinate values of constituent points based on, for example, CAD input or programming using an automatic programming language; (3)
(4) is a constraint point attribute editing means that adds or deletes constraint point attributes to defined constituent points using a mouse or an editor, etc.; The point sequence connection curve generating means for generating the point sequence connection curve will be shown, and the operation related to the configuration will be explained with reference to FIGS. 2 to 6.

First, Fig. 2 shows the result of a point sequence connection curve generated using the constraint point attribute editing means (3) and the point sequence connection curve generation means (4). The attached point, (l
O) is attached with a point without a constraint point attribute, and the third
In the pattern in the figure, (11) is when there is no point other than the constraint point between the constraint points, (12) is when there is one point other than the constraint point between the constraint points, and (13) is between the constraint points. 2 points other than the constraint point
This is a curve generation pattern for a case where the number of points is more than one, and these are created based on the judgment by the point sequence connection curve generation means (4).

Also, Figure 4 shows the point sequence tangent curve editing pattern when using the constraint point attribute editing means (3), and (14) shows the editing pattern before editing when constraint point attributes are added to predefined points. Display image, (15) is a display image before editing of the editing pattern when removing constraint point attributes from predefined points,
(16) is the point where the constraint point attribute is added, (17) is the point where the constraint point attribute is removed, (18) is the editing result when the constraint point attribute is added, (19) is the point when the constraint point attribute is removed. In the editing result, the editing pattern changes by adding and removing constraint point attributes.

Next, an example of the operation of defining point group data and generating a point sequence connection curve using the constraint point attribute editing means (3) and the point sequence connection curve generation means (4) will be described. The flow from point cloud data to point sequence connection curve generation is shown in Figure 5. First, point coordinates are manually generated while instructing whether or not to attach constraint point attributes (550), and the input attributes are Store the point sequence group data in the point cloud database 551)
, a point sequence connection curve is generated from the stored point cloud data (552). At this time, as shown in Figure 3, the method of generating a point sequence connection curve from the point group data with constraint point attributes is based on the continuity of the constraint points. For example, between two circular arc parts), a point sequence connection curve is generated. Also, for example, Fig. 3 (11)
If there are no points other than the constraint points between the constraint points (if the constraint points are consecutive), generate line segment data with fixed start and end points from the two constraint points, and use the method shown in Figure 3 ( 12) As in
If there is one point other than the constraint point between the constraint points, generate arc data that starts and ends at the two constraint points, passing through three points from the two constraint points and the point other than the constraint point sandwiched between them. However, as shown in Figure 3 (13), if there are two or more points other than the constraint points between the constraint points, the constraint points at both ends are determined using a system-specific method from the free end point and the point sequence other than the constraint points. Generate column connection curves.

Next, the operation of editing point cloud data will be explained. The flow of editing the point cloud data and the point sequence connection curve generated from the point cloud data by specifying a certain point in the point cloud data and adding or removing the constraint attribute of that point is shown in Figure 6. First, specify the points to add or remove constraint point attributes (561), specify either the addition or removal of constraint point attributes (552), and edit the point cloud database (563).
, a point sequence connection curve is edited based on the edited point cloud data pace (S64). The editing results for the two patterns of adding and removing constraint point attributes at this time are shown in FIG.

In other words, when the constraint point attribute is added, Fig. 4 (18)
If edited as shown in Figure 4 (
19).

In the above embodiment, in FIG. 5, which shows a flowchart for generating a point sequence connection curve after defining point cloud data, step 550 of defining point coordinates while instructing whether or not to attach constraint point attributes is performed. Alternatively, it is not necessary to define point coordinates and constraint point attributes at the same time, and constraint point attributes may be added after defining point coordinates. Also, in step 551552 of the same figure, there is a block to store in the point cloud database, and the flowchart is to generate a point sequence connection curve after storing it in the point cloud database, or it can be done immediately after storing one point in the point cloud database. It is also possible to take the flow of generating a point sequence connecting curve, and it is not necessarily necessary to store all point cloud data in the point cloud database before generating a point sequence connecting curve.

Further, in FIG. 6, which shows a flowchart for editing a point sequence connection curve by editing constraint point attributes, after specifying the point to be edited in step S61, specifying whether to add or remove the constraint point attribute in step S62. After that, the point cloud data is edited in step 563, and the point string connection curve is edited from the point cloud data in step 564, but step 5
Steps 61 and 562 may be performed at the same time, and step S6
It is also possible to perform 3 and 584 at the same time.

〔Effect of the invention〕

As described above, according to the present invention, constraint point attributes can be specified when defining point cloud data, so feature points of a shape (
It is possible to define curved points, points representing straight lines, and points representing circular arcs, which has the effect of obtaining the desired shape more accurately and quickly.

Furthermore, since the constraint point attributes can be edited, the shape can be edited even after the point cloud data has been defined, and the effect of flexible shape editing can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a graphic processing method according to an embodiment of the present invention, and FIG. 2 is a diagram showing the result of generating a point sequence connection curve when point cloud data is defined using the constraint point attribute editing means. , Fig. 3 is a pattern diagram for generating a point sequence connection curve from the continuity of constraint point attribute addition points, Fig. 4 is an example diagram of point sequence connection curve editing when using the constraint point editing means, and Fig. 5 is a point sequence connection curve diagram. A flowchart of an embodiment in which group data is defined and a point series connection curve is generated. Figure 6 is a flowchart of an embodiment in which constraint point attributes are edited and a point series connection curve is edited. Figure 7 is a conventional flowchart. FIG. 2 is a block diagram illustrating a graphic processing method for defining a shape from the point cloud data definition of FIG. (1) Point cloud definition means, (2) Point cloud editing means, (3) Constraint point attribute editing means, (4), (5) Point sequence connection curve generation means , (7
), (8)...Point group data and point sequence connection curve data stored in the database. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] In a graphic processing method that defines point cloud data and generates shape data, there is a point cloud definition means for defining point cloud data and storing it in a database, a point cloud editing means for editing point cloud data, and a point cloud editing means for editing point cloud data. constraint point attribute editing means for instructing constraint point information to specified points of the database, storing the defined point cloud data with constraint point information in the database, and editing the point cloud data with constraint point information; A point sequence connection curve generation means for generating a point sequence connection curve from point cloud data and storing the point sequence connection curve in another database; and a point sequence connection curve generating means for generating a point sequence connection curve from the continuity of the point group data with constraint point information and other point connection curve generation means to be stored in another database, so that constraint information can be specified and edited when defining and editing point cloud data, and constraint point information is added. A graphic processing method characterized by generating point sequence connection curves from point cloud data.