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Extrusion is the most common method of producing common solid models. It forms
the basics of simple and complex parts of various shapes and sizes. As a first step, a
two dimensional model is created of the object whose 3D model is desired. Once this
is ready, the model is then extruded in the direction and to the width as required.
Taper along the linear direction can also be accommodated. Any variations in
direction different to direction of the standard possible extrusion would be difficult to
create. A sample extrusion is shown in fig 2.4 below.
Fig 2.4 Extrusion
Sweeping with the help of a guide curve is a feature similar to extrusion as it allows
an object to be extruded in different forms as long as there are guide curves which
act as boundaries and guidelines as extent to which the material is extruded. A
sample sweep is shown in fig 2.5 below.
Fig 2.5 Sweeping
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