FR3062731A1 - METHOD AND SYSTEM FOR MOVING A VIRTUAL CHARACTER IN A VIRTUAL ENVIRONMENT - Google Patents

Abstract

A method of moving a virtual character in a virtual environment following a movement of a real user (UR), said virtual environment being generated by at least one computing computer (1) and modified at least by means of a controller (3) hand held by said real user (UR), the method comprising: - a step of real movement of said controller (3) by said real user (UR) in a given direction and direction and - a moving step virtual of said virtual character in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user (UR) during a real movement.

Description

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METHOD AND SYSTEM FOR MOVING A VIRTUAL CHARACTER IN A VIRTUAL ENVIRONMENT

GENERAL TECHNICAL AREA AND PRIOR ART

The present invention relates to the field of virtual reality and, in particular, the movement of a virtual character in a virtual environment following a movement of a real user.

As is known, to have a virtual experience, a real user has a virtual reality computer system which includes:

a helmet to display images of a virtual environment, one or more controllers equipped with actuators (button, touchpad, joystick, trigger, etc.) and a computer calculator connected to the helmet and controllers so as to modify the images displayed depending on the movement or actions of the controllers.

Such a virtual reality computer system is known to those skilled in the art, in particular, in the field of video games so as to allow an actual user to have an immersive experience. The computer calculator generates a virtual environment with which a virtual character can interact using the controllers. Virtual reality artificially reproduces a sensory experience, which can include sight, touch, hearing and smell.

Several technologies have been developed to allow a virtual character to move around in a virtual environment. First, it was proposed to use a controller that the real user points in a direction of the virtual environment. Then, the real user actuates an actuator of the controller in order to move the virtual character to a different place from the virtual environment according to the pointed direction, in the manner, of a teleportation. Such a mode of movement is practical in the virtual environment but disturbs the inner ear of the real user since his eyes perceive movement while his body does not move. This disruption of the inner ear is one of the main obstacles that delay the expansion of virtual reality to the general public.

To eliminate this drawback, a virtual reality computer system has been proposed comprising a multidirectional treadmill in order to allow the real user to carry out real movements of movement. The actual movement movements are measured by the multidirectional treadmill and then supplied to the computer so that the display of the helmet can be modified and the virtual character can be moved. Although such a solution is attractive, a multidirectional treadmill has a very large cost and size. Unfortunately, such a solution cannot suit the general public.

Also, there is a need for a method and system for moving a virtual character in a virtual environment that is comfortable, natural and practical in order to maintain the feeling of immersion of the user without disturbing his inner ear.

The invention was born in the field of video games but it goes without saying that the invention applies to any application of virtual reality, in particular, entertainment, operator training and learning, etc.

GENERAL PRESENTATION OF THE INVENTION

To this end, the invention relates to a method of moving a virtual character in a virtual environment following a movement of a real user, said virtual environment being generated by at least one computer calculator and modified at least by means of a controller held by hand by said real user, the method comprising:

a step of real movement of said controller by said real user in a given direction and direction and a step of virtual displacement of said virtual character in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user during a real trip.

Thanks to the invention, the real movement of the controller makes it possible to mimic a real movement, which advantageously avoids any disturbance of the inner ear during a virtual movement. Such movement is immersive and allows a user to stay focused on the virtual environment without feeling discomfort. In the virtual world, the movement of the controller is interpreted by the computer as a modification of the virtual environment. In practice, the virtual character has the impression of pulling the virtual scene towards him during a forward movement, which maintains the illusion of a displacement while the real user does not move his legs. The virtual movement step is performed in real time following the real movement step. Thus, the user has the impression of moving in the virtual environment in a natural way.

According to a preferred aspect, the virtual movement speed is a function of the real movement speed of said controller. Thus, the actual movement is a direct function of the virtual movement, which gives the impression to the real user that he is actually carrying out the virtual movements of the virtual character.

Preferably, the speed of virtual movement is also a function of the intrinsic speed of the virtual character in the virtual environment. Thus, the real movement of the controller makes it possible to modify the intrinsic speed of the virtual character in the virtual scene. Indeed, the virtual character can have an intrinsic virtual speed which is linked to the virtual scene, for example, a slide or training by a virtual vehicle or another virtual character.

Preferably, the controller comprising a travel actuator, the actual movement is measured when the travel actuator is actuated. Thus, this makes it possible to perform a virtual movement only when the real user so decides. In addition, it allows the real user to use the controller for another function when the travel actuator is not actuated, for example, to shoot for an application in a shooting video game at first. person.

More preferably still, the position of the controller being measured periodically, the actual movement of said controller defines a motion vector between two consecutive measurements of the position of said controller, the motion vector defining the direction and direction of the actual movement. Advantageously, the position of the controller is followed so as to interpret the movement desired by the user (direction of movement and speed of movement). The type of virtual movement can thus be chosen in a precise and practical way by the real user, which reinforces the immersion in the virtual environment. Depending on the direction and the virtual environment, the user can walk, jump, swim, climb, etc.

Preferably, the virtual user being equipped with a helmet displaying images of the virtual environment at a given display frequency, the position of the controller is measured at the display frequency of said helmet.

Preferably, if the vertical position of the controller is greater than a predetermined threshold height during the actual movement, the vertical component of the movement vector is canceled to define the virtual displacement. In other words, if the real user moves in a quarter of a circle (from the front to the bottom), only the horizontal component and the lateral component are taken into account to advance the virtual character. The virtual character is not moved up. Such a step allows a virtual character to move in a practical manner in the horizontal plane (plane transverse to the vertical axis) without requiring the real user to move his arm exactly in the horizontal plane, which could be tiring and away from a natural movement.

Preferably, the method comprises a step of calculating a new virtual displacement speed (V _n + i) from the previous virtual displacement speed (V _n ) so as to allow a deceleration of the virtual displacement when the travel actuator is no longer actuated. Virtual deceleration simulates the presence of gravity and air friction on the virtual character during a movement initiated by a real movement. The virtual character and thus slowed down in a similar way to a real user, which reinforces the feeling of immersion. Releasing the travel actuator allows the user to brake gradually.

Preferably, if the previous virtual displacement speed (V _n ) is greater than a predetermined high threshold, the new virtual displacement speed (V _n + i) is calculated according to a first law. The use of a high threshold makes it possible to configure the deceleration of the virtual character as a function of a speed threshold which is preferably predetermined. Thus, any significant speed is limited to allow the real user to keep control of the virtual character.

Preferably, the first law is of the type V _n + i = V _n - Q (V _n ) in which the function Q is an increasing function. Such a first law makes it possible to impose braking which is proportional to the virtual speed. The faster the virtual character moves, the greater the deceleration suffered. This allows the real user to be able to easily control the virtual character after a virtual movement at high speed. Thus, the real user can easily chain virtual movements without feeling discomfort or discomfort linked to his inner ear.

Preferably, if the previous virtual displacement speed (V _n ) is less than a low predetermined threshold, the new virtual displacement speed (V _n + i) is calculated according to a second law. The use of a low threshold makes it possible to configure the deceleration of the virtual character in order to avoid any sensation of displacement at very low speed which is not natural. Preferably, the second law cancels the new virtual displacement speed (V _n + i). The impression of sliding of the virtual character is advantageously eliminated, which reinforces the feeling of immersion.

Advantageously, if the previous virtual displacement speed (V _n ) is between the low predetermined threshold and high predetermined threshold, the new virtual displacement speed (V _n + i) is calculated according to a third law. Thus, the third law makes it possible to smooth the virtual displacement in order to slow down the virtual character in a progressive manner from high speed to low speed. The virtual character thus remains controllable while maintaining an immersive movement.

Preferably, the third law is a law of linear deceleration. Thus, the degree of deceleration is less than the first law but greater than the second law to allow progressive deceleration.

Preferably, the virtual character is surrounded by a virtual capsule during a virtual displacement, the virtual capsule not being visible in the absence of displacement. Preferably, the virtual capsule is fixed relative to said virtual character. Advantageously, the virtual capsule is attached to the virtual character and remains fixed relative to the latter, which forms a fixed point which helps the inner ear to assimilate the fact that the body of the real user does not move then that the view of the real user perceives the displacement of the virtual character. The disturbances of the inner ear are then reduced.

Preferably, the virtual capsule is in the form of a plurality of elementary zones spaced apart in the vertical direction. Such a virtual capsule does not obstruct the field of vision of the real user but makes it possible to remain visible regardless of where the real user directs his gaze. The virtual capsule does not interfere with the experience of the real user.

Preferably, each elementary area is in the form of a circle. Such a zone advantageously occupies a peripheral space around the user to capture his gaze regardless of his direction.

More preferably, at least one elementary zone has a crenellated portion. A crenellated portion has the advantage of fixing the gaze, which facilitates its interpretation by the inner ear. A crenellated portion makes it possible to define a plurality of points or angles which fix the gaze unlike a continuous circle. The crenellated portion makes it possible to highlight the fact that the elementary zone does not belong to the virtual environment but is attached to the virtual character.

The invention also relates to a method of moving a virtual character in a virtual environment following a movement of a real user, said virtual environment being generated by at least one computer calculator and modified at least by means of a held controller. by hand by said real user, the method comprising a step of displaying a virtual capsule around the virtual character during a virtual movement in the virtual environment, the virtual capsule not being visible in the absence of displacement.

The invention also relates to a system for moving a virtual character by a real user, the movement system comprising:

at least one computer computer configured to generate a virtual environment, at least one helmet adapted to display the virtual environment generated by the computer computer, at least one controller, connected to said computer computer, configured to modify the virtual environment, the controller comprising a device for detecting the position of said controller in space, the computer is configured to measure an actual movement of said controller by said real user in a given direction and direction; the computer is configured to control a virtual movement of said virtual character in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user during a real movement.

Such a movement system allows an actual user to live an immersive experience in which the movements of his virtual character are natural and comfortable since the controller simulates the movement of an arm during movement.

PRESENTATION OF THE FIGURES

The invention will be better understood on reading the description which follows, given solely by way of example, and referring to the appended drawings in which:

FIG. 1 is a schematic representation of a computer system for generating a virtual environment according to an embodiment of the invention;

Figure 2 is a schematic representation of the movements of the arms of a real user when moving the virtual character; Figure 3 is a schematic representation of the movement of the hand-held controller;

FIG. 4 is a curve representing the fall in virtual speed V over time T following a virtual displacement; and

Ια Figure 5 is a schematic representation of a virtual user and a virtual capsule.

It should be noted that the figures show the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary.

DESCRIPTION OF ONE OR MORE MODES OF IMPLEMENTATION AND IMPLEMENTATION

Referring to Figure 1, there is shown a computer system for moving a virtual character PV in a virtual environment, which will be designated later, computer system S for the sake of brevity. Such a computer system S is configured to create an immersive virtual environment in which a real user, that is to say a human person, is represented in the virtual environment by a virtual character that can be human or other. In virtual reality, the real user experiences sensations through his virtual character who represents him.

As illustrated in FIG. 1, the computer system S comprises a computer computer 1, a helmet 2, placed on the head of the real user UR and two controllers 3 which are respectively placed in the two hands of the real user UR.

In this example, the helmet 2 includes a display screen intended to be worn close to the eyes of the real user, the helmet 2 is connected to the computer 1 by a wireless link, in particular, by infrared or by radio link. . The helmet 2 receives images of the virtual environment which are created by the computer 1. The helmet 2 makes it possible to display images of the virtual environment at a given display frequency.

In this embodiment, the computer 1 is deported from the real user UR and is in the form of a game console or a personal computer.

Such a helmet 2 and such a computer 1 are known to those skilled in the art and will not be presented in more detail below.

Nevertheless, it goes without saying that the computer 1 could also be worn by said real user UR, in particular in the helmet 2. According to one aspect of the invention, the helmet 2 comprises a smart phone comprising a display screen forming the display screen of the helmet 2 and a printed card equipped with a processor which forms the computer 1 of the computer system S.

In this example, the two controllers 3 are identical. Also, for the sake of clarity and conciseness, only one controller 3 will now be presented in detail. Nevertheless, it goes without saying that the controllers 3 could be different, for example, in order to perform different functions and / or adapt to the morphology of the right hand and the left hand of the real user UR.

It goes without saying that the computer system S could comprise only a single controller 3 to allow movement. The use of two controllers 3 simultaneously or sequentially makes it possible to vary the type of virtual movements and thus enrich the immersion of the real user UR.

Each controller 3 includes actuators and a position detection device so as to detect the actual movement of the controller (performed by the real user UR) in real space. In this example, the actuators of each controller 3 are in the form of buttons, an adjustable rod known by its English designation "joystick", a trigger and a touchpad. It goes without saying that the nature of the actuators can vary depending on the desired application.

Preferably, the device for detecting the position in real space is in the form of a laser scanning device, an optical tracking device (of the stereoscopic type or not) or the like. In known manner, the detection device makes it possible to determine a position with a horizontal component, a vertical component and a lateral component.

In this example, each controller 3 includes a travel actuator 30 which can change between an activated state corresponding to a desire to move the real user UR and a deactivated state corresponding to a desire to stop the real user UR. Preferably, the travel actuator 30 is in the form of a push button which is pressed in the activated state and released in the deactivated state.

According to the invention, the computer 1 is configured to measure an actual movement of said controller 3 by said real user UR in a given direction and direction. As will be presented hereinafter with the examples of implementation, the real movement of the controller 3 is obtained by the position device of said computer 1.

In addition, the computer 1 is configured to control a virtual movement of said virtual character in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user UR during a actual displacement. In other words, the actual movement of the controllers is transmitted to the computer 1 which consequently modifies the virtual environment in relation to the virtual character. In other words, from the point of view of the virtual character, he receives a plurality of new images in his helmet 2, which gives him the impression of moving in the virtual environment. In practice, to advance in the virtual environment, the real user has the impression of pulling towards him the virtual environment that he sees through his helmet 2.

As illustrated in FIG. 2, the real movement carried out by the arm of the real user UR holding the controller 3 is close to that of a person who moves while walking (swinging of the hands). The displacement is therefore natural, which reinforces the immersion.

It will now be presented several real movements of one or more controllers 3 to perform different virtual movements in the virtual environment. As will be discussed in detail later, the correlation between actual movements and virtual movements is optimal in order to avoid any dysfunction of the inner ear, which limits the onset of nausea or headache.

As an example, a movement of walking, running, jumping, swimming and climbing will be presented. It goes without saying that these movements are given only by way of example and that other movements could be implemented.

The walking movement will be presented in detail, in particular, with regard to the aspects relating to deceleration. The other virtual movements will be presented in a more concise manner so as to highlight the differences with the walking movement.

To carry out a virtual movement, the real UR user uses one or more controllers

3. In the examples which follow, the real user UR is equipped, in each hand, with a controller 3 which includes a travel actuator 30.

To carry out a virtual forward movement, the real user UR performs a step of real movement of said controller 3 from the front to the rear while keeping the travel actuator 30 pressed (state activated). When the travel actuator 30 is activated by the real user UR, this determines a starting position. When the travel actuator 30 is released (deactivated state) by the real user, this determines an arrival position from which a virtual deceleration can be applied.

Periodically, in particular, at the display frequency of the helmet 2, the position of the controller 3 with the travel actuator 30 pressed is measured so as to define a motion vector K between the previous position P _n -i and the current position P _n . The motion vector K comprises a direction, an orientation and an amplitude. The motion vector K is determined by the position detection device of said controller 3. The motion vector K has a horizontal component, a vertical component and a lateral component.

Referring to Figure 3, there is shown schematically the movement of a controller 3 between a previous position P _n -i and a current position P _n and the resulting motion vector K. Incidentally, the motion vector K is independent of the path of real motion in space.

Advantageously, the virtual displacement is carried out in the direction of the motion vector K but oriented in the opposite direction. In other words, when the motion vector K is oriented from front to back, the virtual character PV moves forwards. This is particularly advantageous since it allows the arm of the actual user to make a movement analogous to that performed when walking forward. The inner ear perceives a movement forward thanks to its sight and thanks to the movement of its arm. Also, the inner ear is not disturbed and the user is not prone to nausea or headache.

The virtual speed is a function of the amplitude of the motion vector K. Thus, the greater the actual speed, the greater the virtual speed.

Preferably, if the vertical position of the controller 3 is greater than a predetermined threshold height during the actual movement, the vertical component of the motion vector K is canceled to define the virtual displacement. In other words, if the real user moves in a quarter of a circle (from the front to the bottom), only the horizontal component and the lateral component are taken into account to advance the virtual character. The virtual character is not moved up. Such a step allows a virtual character to move in a practical manner in the horizontal plane (plane transverse to the vertical axis) without requiring the real user to move his arm in the horizontal plane.

Preferably, the threshold height is determined to distinguish when the real user is in a standing position or in a lowered position. In the standing position, that is to say when the vertical position of the controller 3 is greater than the threshold height, the vertical component is filtered because the real user does not wish to perform a vertical movement in the standing position. As will be discussed below, the vertical component is used for the jump and requires the user to be lowered to simulate the pulse of a jump.

In practice, the threshold height is equal to 40 cm for an actual user whose size is 1.80 m. It goes without saying that the threshold height could be determined differently, in particular, by learning or during initialization.

In the virtual environment, virtual movement is also optimal since the computer 1 generates a display in which the virtual environment located towards the front is brought closer to the virtual user. In other words, the real UR user has the impression of grabbing with his hand the virtual environment located towards the front and pulling it towards him (movement of the controller 3 from back to front during activation travel actuator 30). Also, the immersion of the real user UR is not affected by the displacement which remains natural.

When the real user UR performs a wide movement with his arm holding the controller 3, a plurality of motion vectors K are calculated in order to periodically modify the speed and direction of the virtual movement. Freedom of movement is greatly optimized.

In order to maintain optimal immersion while not disturbing the inner ear, it is also important to optimally manage the deceleration of the virtual displacement. Deceleration is activated as soon as the travel actuator 30 is released.

Preferably, a virtual displacement speed V is calculated from the amplitude and the speed of the last motion vector K supplied by the controller

3.

Then, the virtual movement speed V is reduced so as to allow the virtual character PV to decelerate and stop in the virtual environment. To this end, a new virtual displacement speed V _n + i is calculated periodically from the previous virtual displacement speed V _n .

Vn + l = F (Vn)

According to a preferred aspect, the initial virtual displacement speed advantageously allows initialization.

In this example, several speed thresholds are determined: a high threshold Si and a low threshold S2. It goes without saying that a single threshold or more than two thresholds may be suitable. The use of two thresholds Si, S2 is a good compromise to ensure sufficient immersion without requiring significant computing power.

With reference to FIG. 4 representing the value of the speed of movement V during time T following a virtual movement, if the previous virtual movement speed V _n is greater than the predetermined high threshold Si, the new virtual speed of movement V _n + i is calculated according to a first law F1 called "high speed". If the previous virtual displacement speed V _n is less than the low predetermined threshold S2, the new virtual displacement speed V _n + i is calculated according to a second law F2 called “medium speed”. If the previous virtual displacement speed V _n is between the low predetermined threshold S2 and the high predetermined threshold Si, the new virtual displacement speed V _n + i is calculated according to a third law F3 called "low speed". Thus, the different laws make it possible to determine a deceleration at high speed, a deceleration at medium speed and a deceleration at low speed.

In this example, the first “high speed” law F1 is adapted to obtain a decreasing deceleration. In other words, the decrease is proportional to the value of the previous virtual displacement speed V _n . By way of example, the first “high speed” law F1 can be stated as follows:

(Fl) Vn + l = Vn - Q (Vn) in which the function Q is an increasing function

Such a first “high speed” law F1 makes it possible to decrease the deceleration gradually so as to allow the inner ear to maintain a reference in space despite the sensation of speed. The Q function is chosen according to the desired virtual application.

In this example, the second “low speed” law F2 is adapted to cancel the speed if the latter is less than the low threshold S2.

(F2) Vn + l ⁼ 0.

The second "low speed" law F2 avoids the phenomenon of "sliding" or "drift" at low speed of the virtual character PV at low speed. Indeed, the inner ear of a human being is not adapted to perceive a movement at very low speed, which causes nausea and, moreover harms immersion, this displacement not being considered as real. .

In this example, the third “medium speed” law F3 is adapted to obtain a linear deceleration. In other words, the decrease is gradual. As an example, the third "medium speed" law F3 can be stated as follows:

(F3) Vn + i = V _n - Y in which Y is a constant value.

The third “medium speed” law F3 makes it possible to damp the significant deceleration suffered by the virtual character by the first “high speed” law F1. A linear deceleration also makes it possible to reduce the feeling of inertia which is incoherent with that felt by the inner ear of the real UR user.

For example, the high threshold Si and the low threshold S2 are defined by tests according to the desired virtual application in order to obtain a compromise between the comfort of the user and the feeling of immersion.

According to an embodiment of the invention, the high threshold Si and the low threshold S2 are equal. Also, only the first “high speed” law F1 and the second “low speed” law F2 are used.

According to another embodiment, when an actual movement is carried out by the displacement of one or more controllers 3, a deceleration occurs only when none of the travel actuators 30 is actuated.

Preferably, the virtual movement begins as soon as the controller 3 is moved by a real movement of the real user UR with the travel actuator 30 activated. In other words, it is not necessary to release the travel actuator 30 to start a virtual movement. This is particularly advantageous since the movement of the virtual character PV is performed in real time, which facilitates immersion. The release of the travel actuator 30 makes it possible to start the deceleration as presented above.

In order to avoid any disturbance of the inner ear, the computer 1 is configured to display a virtual capsule 4 around said virtual character PV during a virtual movement as illustrated in FIG. 5.

Said virtual capsule 4 envelops the virtual character PV so as to be always visible because it is the last during a displacement. Indeed, such a virtual capsule 4 makes it possible to form a geographical reference linked to the virtual character PV and fixed relative to said virtual character PV. Thus, the inner ear of the real user UR can rely on the vision of the virtual capsule 4 to apprehend a displacement in the virtual environment while keeping a fixed reference which responds to the sensation of non-displacement perceived by the body of the actual UR user. The presence of such a virtual capsule 4 makes it possible to deceive the inner ear by giving it an impression of immobility despite a virtual displacement.

Preferably, the virtual capsule 4 is in the form of a plurality of elementary zones 40 spaced apart in the vertical direction as illustrated in FIG. 5 so as to remain visible, independently of the direction of gaze of the virtual character PV. Preferably, each elementary area 40 is in the form of a circle in order to limit the visual impact while remaining visible.

Thus, the elementary zones 40 make it possible to delimit an overall envelope around the virtual character PV. Preferably, at least one elementary area 40 has a crenellated portion so as to fix the attention of the real user when he is in the virtual environment. Indeed, a crenellated portion has discontinuities and projections which catch the eye of the user. More preferably, the elementary zones 40 all have crenellated portions.

The joint use of the displacement method and a virtual capsule 4 avoids any disturbance of the inner ear while maintaining a significant feeling of immersion.

Preferably, the running movement is carried out by repeating a walking movement with a controller 3 or more controllers 3 alternately. Like a real race, the real UR user must repeat arm swings, that is to say controller 3, to allow his virtual character PV to be advanced at high speed. The repeated cadence of the arm movements makes it possible to advance at a high speed while being freed from the effects of deceleration.

Similarly, the jump movement is achieved by a rapid movement of the controller (s) 3 downwards. The term rapid downward movement is understood to mean an actual movement whose vertical speed is greater than 3 m / s, preferably greater than 4 m / s. In this example, the real user UR must bend down to simulate the impulse of a jump and allow the virtual character PV to make a jump. In other words, the vertical position of the controller 3 must be less than the predetermined threshold height for the vertical component of the motion vector K to be taken into account.

Preferably, the jump movement is performed using the two controllers 3, which makes it possible to mimic the real movement of the arms during a vertical jump. Similarly to previously, the travel actuator 30 of the controllers 3 must be activated during the jump.

Such real movements can also be interpreted differently depending on the position of the virtual character in the virtual scene. For example, if the virtual character is located in a basin filled with water from the virtual environment, the real movement of the controllers 3 allows him to swim in said basin in order to move.

Similarly, if the virtual character is located near an upper surface which can be climbed in the virtual environment, the jump movement is interpreted as a climbing movement which allows the virtual character to climb on said upper surface. Preferably, a higher threshold height is determined in order to be able to take into account the vertical component of the motion vector K during a climb.

As indicated previously, the invention was born in the field of video games but it goes without saying that the invention applies to any application of virtual reality, in particular, entertainment, training and operator training, etc.

Claims (10)

1. Method for moving a virtual character (PV) in a virtual environment following a movement by a real user (UR), said virtual environment being generated by at least one computer calculator (1) and modified at least by means a controller (3) held by hand by said real user (UR), the method comprising: a step of real movement of said controller (3) by said real user (UR) in a given direction and direction, and - a step of virtual displacement of said virtual character (PV) in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user (UR) during a real movement. 2. Method according to claim 1, in which the virtual movement speed is a function of the real movement speed of said controller (3). 3. Method according to one of the preceding claims, wherein, the controller (3) comprising a travel actuator (30), the actual movement is measured when the travel actuator (30) is actuated. 4. Method according to claim 3, in which, the position of the controller (3) being measured periodically, the real movement of said controller (3) defines a motion vector (K) between two consecutive measurements of the position of said controller ( 3), the motion vector (K) defining the direction and direction of the actual motion. 5. Method according to one of claims 3 to 4, comprising a step of calculating a new virtual displacement speed (V _n + i) from the previous virtual displacement speed (V _n ) so as to allow a deceleration of the virtual movement when the travel actuator (30) is no longer actuated. 6. Method according to claim 5, in which, if the previous virtual displacement speed (V _n ) is greater than a predetermined high threshold (Si), the new virtual displacement speed (V _n + i) is calculated according to a first law (Fl). 7. Method according to one of claims 5 to 6, in which, if the previous virtual displacement speed (V _n ) is less than a low predetermined threshold (S2), the new virtual displacement speed (V _n + i) is calculated according to a second law (F2). 8. Method according to one of claims 1 to 7, wherein the virtual character (PV) is surrounded by a virtual capsule (4) during a virtual displacement, the virtual capsule not being visible in the absence of displacement. 9. The method of claim 8, wherein the virtual capsule (4) is fixed relative to said virtual character (PV). 10. Movement system of a virtual character (PV) by a real user (UR), the movement system (S) comprising: - at least one computer calculator (1) configured to generate a virtual environment, - at least one helmet (2) adapted to display the virtual environment generated by the computer calculator (1), - at least one controller (3), connected to said computer computer (1), configured to modify the virtual environment, the controller (3) comprising a device for detecting the position of said controller (3) in space, - the computer calculator (1) is configured to measure a real movement of said controller (3) by said real user (UR) in a given direction and direction; - the computer (1) is configured to control a virtual movement of said virtual character (PV) in the same direction as the real movement but in an opposite direction so as to reproduce the movement of an arm of a real user (UR ) during a real trip.