Polygon modeling is collection of edges, vertices and faces that all join together to create a object within 3D modeling. The mesh for any 3D model is made up of faces usually shaped as triangles or quadrilaterals.
Primitive modeling is a easy and simple way to model, it is also one of the most used methods. This method consist of using different primitive shapes and connecting them together, for example a cube and a cylinder. This is a really quick and effective way to create what ever you are wanting to make.
Box modeling is another popular method of modeling. When using this method you use primitive shapes to create a very rough version of your model, then you start to sculpt into it. You do this by using tools like subdivide and extrude.
Extrusion modelling is a quite simple but very effective way of modelling allowing you to make both simple and complex models. When using this type of modelling you end up with a nice clean model when you finish.
For this method you use a 3D scanner to scan a real object, once you have scanned your object the computer will make a 3D mesh of what you just scanned, for example you could scan a person. 3D scanners are mostly used by professionals
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