When modelling there are various ways you can start, different modeling types are available such as Box, Edge and Extrusion.
Box modeling is a type of modeling in which you use extrusions and subdivisions to create various shapes with only using few shapes. The shapes split up into more faces and edges using a sub divide tool or edge loops, this gives much more freedom to the user by giving more faces, edges and vertices to move and extrude. Extrusions allow for the user to manipulate the shapes to their liking to create more complex shapes.
Extrusion modeling is also a way of modeling, this way of modelling is taking a single vert or using and edge and extruding it around an object. when the base object is traces using extrusions its the extruded along the Z axis to create a 3D object. This would be popular for symetrical things as it would be easy to create one half of it then mirror it.
Models can also be created from drawing/plans, an example of this is floor plans for houses, 3d models can be created to so how the house would look in a 3D environment, These would be created by created shapes over the walls to create the house. This can be used for other buildings as well, this type of modelling would save money as you would not need to create real life models which could cost a lot of money.
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