Meshes are a collection of faces, vertices and edges that define the shape of the object with the 3D model. These faces are made up of triangles and even sometimes quadrilaterals or some other type of polygon.
Primitive Modelling
Most methods of creating meshes is by connecting multiple primitives together and are then predefined by the modelling software. Primitives are commonly known as cubes, spheres, pyramids and cylinders and 2D primitives include squares, triangles and circles.
Box Modelling
This is when the artist starts off with the basic primitive and then begin to modify by extruding, scaling and rotating faces and edges. Box modelling only needs to use 2 simple tools which are;
Subdivide: Splitting faces and edges into smaller pieces by adding more vertices, for example a square would be subdivided into 4 smaller squares.
Extrude: Is applied to faces. It creates a completely new face that is the same size and shape, and is connected to the edges of the original face. Extruding a square would create a cube.
Extrusion Modelling
Another method of creating meshes is called inflation/extrusion modelling. For this method, a 2D shape is created which traces the outline of something from an image. Then a second image of a different angle is used and the 2D shape is extruded while following the 2nd shape's outline. This method is common for creating objects such as heads, and artists may create half of a head then duplicate it and flip it and connect the pieces.
Sketch Modelling
This method is very user friendly which allows it to quickly sketch models with less detail than other models.
3D Scanners
3D scanners are used to create meshes designed for real life objects in a high quality, however these scanners are very expensive and are commonly used for professional work.
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