1. A method of producing animation data in a data processing system, said system comprising data storage means, processing means, visual display means and manually responsive input means, comprising the steps of displaying a simulated three-dimensional world-space to a user on said visual display means and displaying an animatable actor in said world space; receiving first input data from a user via said manually responsive input means specifying a desired location and orientation for said actor to which said actor is to animate towards from a starting location; instructing said processing means to generate first animation data using a first processing technique in response to said first input data; instructing said processing means to generate second animation data using a second processing technique in response to said first input data; receiving second input data from a user via said manually responsive input means defining a blend parameter that defines a blending between said first animation data and said second animation data; and producing output animation data by interpolating between said first animation data and said second animation data to extents controlled by said received blending parameter.