The building blocks of a part model are called features. There are four basic types of Features:
- Sketched features that require a sketch.
- Placed features that modify existing geometry. For example, a hole is a placed feature.
- Work features used for construction purposes.
- iFeatures that represent common shapes and are saved in a reusable library. An iFeature driven by a table can represent different shape configurations.
You can create surfaces with many of these operations to define shapes or aspects of the part body. For example, you can use a curved surface as a termination plane for cuts in a housing.
You can edit the characteristics of a feature by returning to its underlying sketch, or changing the values used in feature creation. For example, you can change the length of an extruded feature by entering a new value for the extent of the extrusion. You can also use equations to derive one dimension from another.