According to at least one embodiment, there is provided a computer animation method comprising: causing at least one visual display to display at least one virtual three-dimensional user interface to at least one user; and receiving at least one user input signal from at least one sensor of three-dimensional movement in response to, at least, movement of the at least one sensor by the at least one user, wherein the at least one user input signal represents interaction by the at least one user with the at least one virtual three-dimensional user interface at least to define at least one animation parameter. Computer-readable media and systems are also disclosed.