| CPC A63F 9/0252 (2013.01) [A63F 9/24 (2013.01); A63F 13/573 (2014.09); G06F 3/011 (2013.01)] | 13 Claims |
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1. A method for controlling a graphic interface for displaying images of a digital representation of a three-dimensional object, called launcher, in a virtual environment, the launcher being configured to launch a projectile in a virtual environment, wherein the launcher comprises a structure made of a non-magnetic material with a launching arm that is assembled so as to be mobile and constrained in movement, a magnet being fixed to the launching arm, the method being implemented by a computation unit, comprising the following steps:
providing a locating device for locating the launcher in a tracking zone, comprising:
an array of magnetometers fixed to a support surface,
wherein the computation unit is connected to the array of magnetometers and to the graphic interface, and
wherein the tracking zone for tracking the launcher with respect to the array of magnetometers is predefined, and a real three-dimensional reference frame is associated with the tracking zone;
in storing, in the computation unit:
a digital file coding the virtual environment in a virtual three-dimensional reference frame, the virtual three-dimensional reference frame being associated with the real three-dimensional reference frame via a predefined mapping relationship;
a digital model making it possible to associate, with a state vector Xa|r of the magnet representative of the position and of the orientation of the magnet in the real three-dimensional reference frame, a state vector Xb,v of the launching arm representative of the position and/or of the orientation of the launching arm in the virtual three-dimensional reference frame, and making it possible to obtain a digital representation of the launcher in the virtual three-dimensional reference frame;
manipulating, by a user, the launching arm, wherein the launcher is situated in the tracking zone and disposed in contact with the support surface, the launching arm being able to be away from a rest position by the user, a return member then exerting a return force on the launching arm toward the rest position;
measuring, by the array of magnetometers, a magnetic field generated by the magnet at different successive measurement instants tn;
determining the state vector Xa|r of the magnet in the real three-dimensional reference frame, at the measurement instant tn, from the measurements of the magnetic field generated by the magnet;
determining, at the measurement instant tn, the state vector Xb|v of the launching arm in the virtual three-dimensional reference frame, from the prestored digital model and from the predetermined state vector Xa|r, and the position Pp|v of the projectile from the prestored digital model and from the predetermined state vector Xb|v;
identifying an arming phase of the launching arm as a function of an arming factor K1 defined from the state vector Xb|v at the measurement instant tn and at prior measurement instants, wherein the arming phase is identified when the arming factor K1 is greater than or equal to a predefined threshold value K1s;
when the arming phase is identified, identifying a firing of the projectile as a function of a launching factor K2 defined from the state vector Xb|v at the measurement instant tn, wherein the firing of the projectile is identified when the launching factor K2 is greater than or equal to a predefined threshold value K2s;
when the firing of the projectile is identified, determining the successive positions Pp|v of the projectile in the virtual three-dimensional reference frame at subsequent measurement instants;
constructing a two-dimensional image, representing, in the virtual three-dimensional reference frame, the virtual environment, the digital representation of the launcher, and the projectile, from the predetermined state vector Xb|v of the launching arm and from the predetermined position Pp|v of the projectile, then controlling the graphic interface by the computation unit to display the constructed image.
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