Object classification according to property information (Body / Member)
Summary | Body and Member Concepts |
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Related Function |
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Type | FAQ, Tip |
Q. What is the difference between a body and a member?
A. Body represents a point, line or a plane object. A Member represents an object with both shape information and member information.
Figure. 1 CIM 3D modeling environment
CIM provides a three-dimensional modeling environment.
Points, wires, surfaces, and solid elements can be freely created and each created object has its property information.
Users can use various object property information to create outputs based on CIM models such as drawings/quantities/interpretations.
Object property information is largely divided into two categories.
Objects have a variety of property information. This property information can be divided into two main categories depending on its characteristics.
Shape Property : Property that determines appearance, such as shape or color
Geometry / Graphic / Section (Only 1D Member) / Thickness (Only 2D Member)Member Property : Property of a member with material properties
Material / Analysis / Work Type / Structure
By default, only objects with member properties can generate drawings/quantities/analysis results, but not all objects in the CIM model space have the member properties.
Objects are divided into Body and Member based on the availability of member properties.
All objects have feature properties.
Body : Point, Wire, Surface, Solid object with only shape properties
Member : Solid object with both shape and member properties
* All members are solid objects with volume
This document talks about the concept of a body and member object.
If the user understands and utilizes the characteristics of each object well, modeling will be straightforward and easy to use for any project.
The topics below will cover the definition and explanation of the terms ‘D’ and ‘Geometry’ that are used throughout the tutorial.
Concept of a Body
A Body object refers to any object that only has shape information for its property. (Geometry / Graphic)
A Body object does not have any additional information other than its Geometry properties that define its shape. Hence, the Geometry information of a Body is basically its shape information.
All objects, such as points, wires, surfaces, and solid, can be bodies, and are classified according to object type as shown in Figure. 2 below.
Figure. 2 Body Classification
Body objects are independent from all Edit functions, so they can be utilized as 3D CAD models provided by CIM.
Hence, there is an advantage of having a high degree of freedom in shape modeling.
However, when using 3D Body (Solid Body) objects among the Body objects, the user should keep the following in mind.
Solid objects are divided into 3D Body and Member objects. 3D Body objects only have shape information, so the following needs to be kept in mind.
Without material properties, it is not possible to generate secondary outputs such as analysis linkage, quantity calculation and drawings.
Most functions in the ribbon menu tab model cannot be used. (Functions that require member information, such as detailed modeling of Rebar/Tendon/Stiffener, cutting functions, etc.)
Concept of a Member
A Member object refers to any object that has both shape and member information for its property. Only solid objects can have member properties.
Hence, all members are solid objects.
By default, all member objects have member information that separate them from 3D Body objects.
Member objects are divided into three categories based on how they are defined, and can be classified as shown in Figure 3 below.
Figure. 3 Member Classification
Member objects apply additional properties to structural geometry to make the shape three-dimensional and the basic principle of creating each member is shown below.
Figure. 4 1D Member (1D Geometry with sections at the ends)
Figure. 5 2D Member (2D Geometry with thickness)
3D Member (3D Body with Member Property)
Each member object has different usage based on how it is created.
As discussed above, bodies and members have significant differences in terms of properties and their uses.
If appropriate modeling features are used for the right purposes, the user can achieve the desired project results.