Modeling method of representing geometric information of objects in cad system

There are many modeling methods to express geometric information of objects in CAD system, among which the most common ones are:

Point-line-surface model

Point-line-surface model is the most basic modeling method in CAD system, which represents objects as a series of points, lines and surfaces. In the point-line-surface model, the surface of an object consists of a series of adjacent surfaces, each surface consists of a group of adjacent line segments, and each line segment consists of two adjacent points. Point-line-surface model is simple and easy to use, and it is the most basic modeling method in CAD system.

Solid model

Entity model is a modeling method that represents an object as a series of entities. In the solid model, the surface of an object consists of a series of faces, each face consists of a group of adjacent boundary line segments, and each boundary line segment consists of two adjacent points. Solid models can more accurately represent the geometric shape and volume of objects, and are often used in the design and manufacture of construction, machinery and other industries.

Curve and surface model

Curve and surface model is a modeling method used to represent complex curves and surfaces in CAD system. In the curve and surface model, the surface of an object consists of a series of curves and surfaces, and each curve and surface can be defined by a series of control points and control line segments. Surface model can represent complex geometric shapes and surfaces more accurately, and is often used in the design and manufacture of automobiles, airplanes, ships and other industries.

Programmatic modeling

Programmatic modeling is a modeling method that uses computer programs to generate objects. In programmed modeling, the geometric shape and size of an object are defined by a series of parameters and algorithms, and objects with different shapes and sizes can be generated by changing the parameters. Programmatic modeling can quickly generate a large number of complex objects, which is often used in industrial design, architectural design and other fields.

In a word, there are many modeling methods to express geometric information of objects in CAD system, and each modeling method has its own characteristics and application scope. By choosing appropriate modeling methods, the shape and size of objects can be expressed more accurately, and the efficiency and accuracy of design and manufacturing can be improved.