What defines the specific values for the degrees of freedom in a 3D model's joint?

The drive joint is instrumental in a 3D model as it defines the specific values for the degrees of freedom, which include rotary and translational movements. Joints in a 3D modeling context are crucial components that dictate how different elements of a model interact with one another in terms of movement. In a mechanical assembly, for example, understanding how a drive joint works is vital for simulating realistic motion and analyzing the constraints and capabilities of different parts.

While fillets, features, and extrusions are all important aspects in 3D modeling, they do not pertain to defining the degrees of freedom. A fillet refers to the rounding of an inside or outside corner, enhancing aesthetics and stress distribution, while a feature is a term for any distinct shape or modification applied to a solid model. Extrusions involve extending a 2D shape into 3D space, but neither of these directly influences how components move in relation to one another, which is what a drive joint accomplishes. Thus, the drive joint is the correct answer as it directly addresses the movement dynamics within the model.