Filleting is used mainly to create a smooth join between two or more surfaces.
It enables you to take a selection of surfaces:
and create fillet surfaces between them:
In your model, you may see two distinct sets of surfaces between which you wish to create a fillet. PowerShape allows you to select a fillet route and then create a fillet between these two defined sets. This method of filleting works faster than selecting all surfaces in a model, as PowerShape would then define every possible fillet route.
You can also create a fillet between a single wireframe object and a set of surfaces . This is illustrated below.
The fillet, created between the surface and the wireframe curve, is shown below: