Abstract: A method comprises displaying in virtual reality a computer-generated scene; obtaining a movement command from a real-world physical movement of a user, the movement command corresponding to a movement of a virtual body; and adjusting the movement of the virtual body in dependence on an effect of gravity in the computer-generated scene and/or in dependence on the presence of at least one object within the computer-generated scene that inhibits the movement of the virtual body, wherein the adjusting of the movement is such that the adjusted movement of the virtual body does not correspond with the real-world physical movement of the user.