Differences and connections (phases, uses)
- Design: CAD, BIM
- Construction: BIM, GIS
- Operation and maintenance: BIM lightweight model, digital twin system
CAD and BIM (Building Information Modeling)
The significance of the BIM model is to moderately integrate all the information of the core volume of the building. The scope of its application lies in each stage of the whole life cycle. The BIM model of the core volume can be used as the basis for all applications, and various building information can be uploaded and downloaded in each stage to provide the most complete service.
The purpose of BIM model (software such as ABC) is building information management , and it is positioned to complete the design of the entire construction project, including schematic design, output of results, etc., and visualization is only an incidental role .
The basic elements that make up a BIM model are model components . The geometric data and non-geometric data of the components are linked. For example, the size of a column will change with the adjustment of the length, width and height values to maintain the consistency between the data.
Focusing on the micro, it may be just a building or a park. Because of the fineness of the data, BIM software cannot carry city-level data.
3DMax (visualization)
The main purpose of 3Dmax (or software such as Sketchup) is to carry out visual modeling , and its positioning is to perform architectural performance , providing rendering-level image and animation display for design .
Those professional rendering tools in the industry can easily cost tens of thousands of authorizations. The post-production rendering adjustment workflow is complicated, and the rendering time is long. The effect doesn't look bad, and it's TM free. Increased profits resulting from lower costs is a major driver of change in the industry.
UE4 and Unity3D (2 game engines)
The original design purpose of the game engine is to reduce the development workload and reduce the development cost.
Cheaper, more open and more efficient than professional rendering software, real-time 3D is about to be realized in the future.
CIM与GIS（GIS + BIM + IoT）
GIS has always paid attention to macro and two-dimensional. With the development of three-dimensional GIS, people suddenly found that the deficiency of indoor data can be completely supplemented by bim data, creating a combination of the two.
Spatial data representation and storage, spatial analysis, spatial query, etc.
A simple definition of CIM is BIM + GIS + IoT.
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