Which of the following is NOT a type of 3D animation?

The choice of "Sketching" as the option that is not a type of 3D animation is accurate because it pertains to a different aspect of the animation and design process. Sketching primarily refers to the creation of 2D drawings or concepts that serve as preliminary visuals for characters, settings, or scenes. It is usually associated with 2D art and design, rather than the production of three-dimensional animations.

In contrast, the other options represent integral components or techniques related to 3D animation. Modelling involves creating the geometric shapes and structures of characters or objects in a 3D space. Rigging refers to the process of creating a skeletal structure within a 3D model that allows for animations such as movement and posing. Motion capture is a technique used to record and analyze the movement of objects or people, which is then applied to 3D models to create realistic animations. Each of these processes contributes directly to the creation and manipulation of 3D animations, distinguishing them from the more fundamental artistic practice of sketching.