3D (three-dimensional) models are created from a build-up of parts in 3D space through connecting various points in geometric shapes like curved surfaces, triangles or lines to form a representation of a physical body. This can be done manually by hand or automatically using 3D computer graphics software.
Uses of 3D modeling
3D models are widely used today in the film, medical, architecture and video game industries. In the medical industry,the models are designed with detailed forms of organs created from many 2D images from CT or MRI scans. Architects use them to illustrate buildings and landscapes with Software Architectural Models. Film production industries use them to create much more real-life animation objects or characters while the video game industry creates their computer games through them.
Categories of 3D modeling
The models are represented in two different categories, that is, solid and boundary/shell. The solid models basically capture the objects volume. They produce much more realistic effects and appear more real-life but are much harder to construct. These mostly work for the engineers and medical practitioners since their effects are more useful for nonvisual solutions. The shell models on the other hand capture the surface of the object they represent and in essence are easier to build and work with. The volume of the object is not important in shell model. This is mostly why boundary models are commonly used in computer graphics to produce the two dimensional effect of surface representation by the models.
3D modeling market
The market for 3D models is large and has created great value for artists who would like to save time creating 3D models from scratch through online markets that offer free 3D models. This broad online market has also allowed many artists to earn money from their previous creations and also helped companies save on investments and time through purchasing ready-made models rather than investing in a company employee to build the models from scratch.