KR102188335B1 - VR content design method for motion sickness reduction - Google Patents

Abstract

The present invention relates to a VR content design method for reducing motion sickness and, more specifically, to a VR content design method which reduces cyber motion sickness of the VR content for head mounted display (HMD) in a vehicle. The VR content design method includes: a background graphic rendering step of generating a dynamic background graphic using vehicle speed information and rotation information; and a user visual information control-based rendering step of controlling the viewing angle and movement speed of the user in the content using the vehicle speed information.

Description

VR content design method for motion sickness reduction

The proposed technology relates to a VR content design method for reducing motion sickness, and more particularly, an invention related to a VR content design method for reducing cyber motion sickness of VR content for head mounted display (HMD) in a vehicle.

Currently, VR (Virtual Reality) contents are attracting attention from researchers, industries, and consumers as next-generation contents like real reality. In particular, VR content has a high potential for use in various applications such as games, broadcasting, entertainment, and training, and the related market size is rapidly expanding.

VR content provides a 360-degree image captured in a circular space, thereby providing users with a sense of immersion and realism as if they exist in an actual image space. Accordingly, the user can perceive an image with a wide viewing angle, and may move his body to view all 360-degree images captured in a circular space.

On the other hand, with the advent of next-generation mobile communication technologies and the development of vehicle networks, cases of using VR contents in vehicles are increasing. However, instead of providing a sense of immersion and reality, VR content is emerging as a serious problem as it induces severe motion sickness in some people, and in severe cases it may cause dizziness or nausea and vomiting.

There are various causes of such motion sickness, but in the case of VR content used in a vehicle, it occurs when actual sensory information and sensory information obtained from the virtual are inconsistent.

Therefore, in order to solve the above problems, research on minimizing the case of sensory inconsistency when a user experiences VR content is required.

Korean Patent Registration No. 10-1831070

The present invention was invented to solve the above problems, and by minimizing the case that the discrepancy between the real sense and the sense acquired in the virtual when a user experiences VR content in a moving vehicle, cyber It aims to reduce motion sickness.

In the VR content design method for reducing motion sickness of the present invention for achieving the above object,

A background graphic rendering step of generating a dynamic background graphic using the vehicle speed information and rotation information;

And a user visual information control base step of controlling the viewing angle and movement speed of the user in the content using the vehicle speed information.

According to the present invention, it is possible to reduce cyber motion sickness that occurs during VR content experience by minimizing the case in which a discrepancy between a real sense and a virtual sense obtained when a user experiences VR content in a moving vehicle is minimized.

1 is a pattern path generation algorithm according to the present invention.
2 is an exemplary view of rendering a background graphic according to the present invention.
3 is a background graphic pattern generation algorithm according to the present invention.
4 is a rendering algorithm based on user visual information control according to the present invention.
5 is an exemplary view of rendering based on user visual information control according to the present invention.

The features and effects of the present invention described above will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, those of ordinary skill in the technical field to which the present invention pertains can easily implement the technical idea of the present invention. I will be able to. Since the present invention can apply various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form of disclosure, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. The terms used in the present application are merely for describing specific embodiments and are not intended to limit the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a VR content design method for reducing motion sickness, and more particularly, to a VR content design method for reducing cybersickness of VR content for a head mounted display (HMD) in a vehicle.

The VR content design method of the present invention includes a method of reducing inconsistency between actual sensory information and sensory information through VR content based on a widely known sensory conflict theory.

The VR content design method of the present invention for reducing motion sickness when using VR content for HMD (Head Mounted Display) in a vehicle,

Background graphic rendering step of generating a dynamic background graphic using the vehicle speed information and rotation information; (S100)

User visual information control-based rendering step of controlling the viewing angle and movement speed of the user in the content by using the vehicle speed information; (S500).

The dynamic background graphic is to convey a sense of speed to the user in the VR content instead, and the background graphic rendering step (S100),

Pattern path generation step, which is a path referenced to generate background graphic patterns; (S200)

A background graphic pattern generation step of generating a plurality of single graphic patterns moving along the pattern path; (S300).

1 illustrates a pattern path generation algorithm according to the present invention, and FIG. 2 illustrates an exemplary background graphic rendering according to the present invention.

The pattern path (CurvedLine _pattern ) generation step (S200),

Generating a direction vector facing the front of the vehicle (UnitVector _Forward ) and a direction vector facing the top (UnitVector _Normal ) in the VR content; (S210)

Creating a world sphere as a virtual space using the direction vector; (S220)

Generating a quadratic Bezier curve by using an extinction point, a generation point, and a center point of the sphere located on the outside of the sphere; (S230) is performed.

First, in the step (S210) of generating a direction vector facing the front of the vehicle (UnitVector _Forward ) and a direction vector facing the top (UnitVector _Normal ) inside the VR content, the direction vector facing the front and the direction vector facing the top are Values are obtained by using an Electric Control Unit (ECU) that stores sensor values such as a gyro sensor configured inside a vehicle.

When the step (S210) of generating a direction vector (UnitVector _Forward ) and a direction vector (UnitVector _Normal ) facing the vehicle inside the VR content is completed, a sphere that is a virtual space is generated using the direction vector. The step (S220) is in progress.

The sphere, which is a virtual space, is a space referred to when a background graphic (eg, sky, forest environment, etc.) of VR content is rendered, and is developed around the user's location. In this case, the radius of the sphere, which is the virtual space, is defined by the creator of the VR content.

When the step of generating a sphere that is a virtual space using the direction vector (S220) is completed, the step of generating a quadratic Bezier curve using the disappearance point, the generation point, and the center point of the sphere located on the surface of the sphere (S230) is It goes on.

The step (S230) of generating a quadratic Bezier curve using the extinguishing point (Position _Destroy ), the generation point (Position _Spawn ) and the center point (Position _Origin ) of the sphere (S230),

Checking the rotation angle of the rear wheel of the vehicle; (S231)

Generating the extinguishing point by reflecting the rotation angle of the rear wheel; (S232)

Checking the rotation angle of the front wheel of the vehicle; (S233)

Generating the generation point by reflecting the rotation angle of the front wheel; (S234)

The step of generating the second order Bezier curve; (S235) and proceeds.

When the direction of the rear wheel is fixed in the step (S231) of checking the rotation angle of the rear wheel of the vehicle, the vanishing point generated in the step (S232) of generating the vanishing point by reflecting the rotation angle of the rear wheel (Position _Destroy ),

Represented by

Here, the position _origin is the center point of the sphere, which is the virtual space, and becomes the center point of the developed space when the sphere, which is the virtual space, is developed around the user's position. Radius is the radius of the virtual space sphere.

In the step of checking the rotation angle of the rear wheel of the vehicle (S231), if the direction of the rear wheel is not fixed, before the step of generating the disappearance point by reflecting the rotation angle of the rear wheel (S232), the vehicle A rear direction vector of (-UnitVector _Forward ) is generated, and a step (S231-1) of rotating the rear direction vector of the vehicle by reflecting the degree _rear of the rear wheel is performed.

Whether the direction of the rear wheel is fixed is checked through the ECU.

If the direction of the rear wheels is fixed, through the back direction vector (-UnitVector _Forward) of the vehicle it is opposite of the direction vector (UnitVector _Forward) toward the front of the vehicle can know the direction of the rear wheel. However, if the rotation value of the rear wheel is variable, the direction vector reflecting the rotation information must be obtained.

In the case of the rear wheel, the default value (when not rotating) is the vehicle's rear direction vector (-UnitVector _Forward ), and in the case of the front wheel (when not rotating), the default value (when not rotating) is the vehicle’s front direction vector (UnitVector _Forward ). .

The default value is rotated in consideration of a direction vector (UnitVector _Normal ) facing the top of the vehicle, because the vector refers to a rotation axis when rotating.

That is, the direction vector facing the top of the vehicle is used as a rotation axis, and in order to calculate the rotation value of the rear wheel, -UnitVector _Forward (in the case of the rear wheel), which is a vector to be applied to the rotation axis as well as the direction vector facing the top of the vehicle, and UnitVector _Forward (for the front wheel) is also considered.

If the steering system used in the vehicle is an independent type, the average rotation value of the left and right wheels is used.

The rotation angle of the rear wheel generated in the step (S231-1) of generating the rear direction vector of the vehicle (-UnitVector _Forward ) and rotating the rear direction vector of the vehicle by reflecting the rotation angle of the rear wheel (Degree _rear ) The reflected direction vector (UnitVector _ModifiedRear ) is,

Represented by

When the direction of the rear wheel is not fixed in the step (S231) of checking the rotation angle of the rear wheel of the vehicle, the disappearance generated in the step (S232) of generating the extinguishing point by reflecting the rotation angle of the rear wheel Position _Destroy is,

Represented by

Here, Position _Origin is the center point of the sphere in the virtual space, Radius is the radius of the sphere, and UnitVector _ModifiedRear is a direction vector in which the rotation angle of the rear wheel is reflected.

When the direction of the front wheel is fixed in the step (S233) of checking the rotation angle of the front wheel of the vehicle, the generation point generated in the step (S234) of generating the generation point by reflecting the rotation angle of the front wheel (Position _Spawn ) is,

Represented by

Here, Position _origin is the center point of the sphere that is the virtual space, Radius is the radius of the sphere, and UnitVector _Forward is a direction vector facing the front of the vehicle.

If the direction of the front wheel is not fixed in the step (S233) of checking the rotation angle of the front wheel of the vehicle, before the step of generating the generation point by reflecting the rotation angle of the front wheel (S234), the vehicle A front direction vector (UnitVector _Forward ) of is generated, and the step (S233-1) of rotating the front direction vector (UnitVector _Forward ) by reflecting the degree _front of the front wheel is performed.

Rotation of the front wheel produced in step (S233-1) to produce a vector (UnitVector _Forward) the front direction of the vehicle, rotating the vector (UnitVector _Forward) the front direction by reflecting the rotation angle (Degree _front) of the front wheel The direction vector in which the angle is reflected (UnitVector _{ModifiedFront} ),

Represented by

When the direction of the front wheel is not fixed in the step (S233) of checking the rotation angle of the front wheel of the vehicle, the generation generated in the step (S234) of generating the generation point by reflecting the rotation angle of the front wheel Position _Spawn ,

Represented by

Here, Position _origin is the center point of the sphere in the virtual space, Radius is the radius of the sphere, and UnitVector _{ModifiedFront} is a direction vector in which the rotation angle of the front wheel is reflected.

When the center point, the disappearance point, and the generation point of the virtual space sphere are all generated, in the step of generating the quadratic Bezier curve (S235), the center point of the sphere, the disappearance point, and the location value of the generation point The pattern path, which is a quadratic Bezier curve, is generated by using.

3 illustrates an algorithm for generating a background graphic pattern according to the present invention.

The background graphic pattern generation step (S300),

Calling the pattern path generated in the pattern path generating step; (S310)

Checking the generation point (Position _PatternIndex ) of the N-th single graphic pattern among the background graphic patterns in the pattern path; (S320)

The step of obtaining a movement length value, which is a length for the generation point of the N-th single graphic pattern to move by reflecting the vehicle's speed, life cycle, and time difference; (S330)

Moving the generation point of the N-th single graphic pattern by the movement length value; (S340)

Checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path; (S350).

The background graphic pattern is generated at the generation point, moves along the pattern path, arrives at the disappearance point, and is removed.

Thus, the generation point of the background graphic to create a pattern and then call up the said pattern path (Curvedline _pattern) generated by the pattern path generating step (S200), the background graphic pattern N second single graphic of the above pattern path pattern (Position _PatternIndex ) is checked.

Thereafter, a step (S330) of obtaining a movement length value that is a length for movement of the N-th single graphic pattern generation point reflects the vehicle's speed, life cycle, and time difference (S330).

In the step (S330) of obtaining a movement length value that is a length for the N-th single graphic pattern generation point to move by reflecting the vehicle's speed, life cycle, and time difference, the movement length value (Length _{DifferenceValue} ) is,

Represented by

Here, Velocity _Current is a current velocity value of the vehicle, and Velocity _{MovingAverage} is a velocity value of a vehicle to which a moving average filter is applied. Velocity _Current and Velocity _{MovingAverage} are velocity-measuring devices, e.g. velocity values retrieved from an instrument panel.

The moving average filter is used to determine the N+1 th value when the speed values of N vehicles are continuously determined. The moving average filter includes M, which is the window size of the HMD, and can be expressed by the following equation.

The moving average filter is mainly used to remove dynamic noise, and the HMD window size M is defined by the manufacturer.

The Length _Pattern is It becomes the total length value of the pattern path (Curvedline _pattern ).

The Time _Previous is a time measured when the background graphic pattern generating step first starts, and Time _Current is a time measured when the background graphic pattern generating step is repeated and re-progressed.

The Time _Current is a variable for measuring a time difference, and is a time when the current background graphic pattern generation algorithm is performed. That is, the time measured when the background graphic pattern algorithm is repeated and re-progressed.

The Time _Previous is a variable for measuring the time difference, and is a time when the previous background graphic pattern generation algorithm is performed. That is, the Time _Previous maintains the last time _current value measured before the background graphic pattern generation step is re-progressed. When the background graphic pattern algorithm is first executed, since there is no record that has been previously performed, the Time _Previous uses a Time _Current value (current time).

This background graphic pattern is measured at the background graphic pattern generation step (S300) of the background graphic pattern algorithm who goes on and just before one hour (Time _Current) measuring the background graphic pattern generation step (S300) of the background graphic pattern algorithm ongoing This is because it moves from the generation point to the extinguishing point in consideration of the time difference of one hour (Time _Previous ).

However, when the background graphic pattern generating step S300 is performed for the first time, since the previous background graphic generating step S300 is absent, Time _Previous measures the time directly without referring to Time _Current .

The LifeCycle is the basic time (seconds) of the life cycle of the single graphic pattern, the life cycle of the single graphic pattern that can be defined by the manufacturer, and has a default value of 20 seconds in consideration of the user's eye fatigue.

When the movement length value is obtained, the generation point of the N-th single graphic pattern is moved by the movement length value. The single graphic pattern is generated one per second.

Thereafter, a step S350 of checking whether the generation point of the Nth single graphic pattern moved by the movement length value deviates from the pattern path (S350) proceeds.

In the step of checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path (S350), when the location of the N-th single graphic pattern deviates from the pattern path, the N-th single graphic pattern After the step of removing the generation point of the graphic pattern (S360) is performed, the background graphic pattern generation step (S300) is performed again.

In the step of checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path (S350), when the generation point of the N-th single graphic pattern does not deviate from the pattern path,

Checking whether the pattern path is a straight line; (S370)

Generating the N-th single graphic pattern based on a point where a plane and a world _sphere , which is the virtual space, contact each other; (S380)

Comparing the total number of the single graphic patterns and the maximum number of background graphic patterns (MaxNumber) to be rendered in the sphere, which is the virtual space; (S390) proceeds.

If the pattern path is not a straight line in the step of checking whether the pattern path is a straight line (S370), before the step of generating the N-th single graphic pattern (S380),

Step in the generation point of the movement length of the N-th single graphical pattern shifted by a value to obtain the slope value (Gradient _Pattern) of the path patterns; (S371)

Having the slope values (Gradient _Pattern) in the normal, obtaining a plane (Plane) including a generating point of the movement length of the N-th single graphical pattern shifted by a value; a (S372) and proceeds.

If the pattern path is a straight line in the step of checking whether the pattern path is a straight line (S370), prior to the step of generating the N-th single graphic pattern (S380), the N-th single graphic pattern moved by the movement length value At the generation point, a step (S373) of obtaining a plane in which the direction vector of the pattern path is a normal line is performed.

When the plane is obtained by checking whether the pattern path is a straight line, the N-th single graphic pattern is generated based on a point where the plane and the world _sphere contact each other, and the single graphic pattern is The total number and the maximum number of background graphic patterns (MaxNumber) to be rendered on the sphere are compared.

In the step of comparing the total number of single graphic patterns and the maximum number of background graphic patterns (S390), a value (X) obtained by adding 1 to N in the N-th single graphic pattern is less than or equal to the maximum number of background graphic patterns. In the case, _returning to the step (S320) of checking the generation point (Position _PatternIndex ) of the N-th single graphic pattern among the background graphic patterns in the pattern path, and generating the N+1-th single graphic pattern among the background graphic patterns in the pattern path The step of checking the position (Position _PatternIndex ) is in progress, and the step is repeated.

In the step of comparing the total number of single graphic patterns and the maximum number of background graphic patterns (S390), when a value obtained by adding 1 to N in the N-th single graphic pattern is greater than the maximum number of background graphic patterns, the background graphic The pattern generation step (S300) is performed again.

4 illustrates a rendering algorithm based on user visual information control according to the present invention.

The user visual information control-based rendering step (S500),

Comparing the current speed (Velocity _Current) of the vehicle and motion sickness level threshold speed; (S510)

Calculating the viewing angle of the user; (S520)

Calculating the movement speed (Player _Modified ) of the user in the VR content; (S530)

Reflecting the viewing angle and the moving speed of the user to the VR content; proceeds including (S540).

The motion sickness level threshold speed (Critical Speed) is generally 36km / h, the current velocity (Velocity _Current) of the vehicle is, for the device, for measuring the velocity, the velocity value loaded from the instrument panel.

5 illustrates an exemplary rendering based on user visual information control according to the present invention.

When the current speed of the vehicle is higher than the motionsickness level critical speed in the step of comparing the current speed of the vehicle with the motion sickness level critical speed (S510), the viewing angle of the user in the step S520 of calculating the user's viewing angle ( FOV _Modified ) becomes a predetermined maximum viewing angle (FOV _Max ) (S520'). The maximum viewing angle (FOV _Max ) is set to 110 degrees.

In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed (S510), when the current speed of the vehicle is higher than the motion sickness level threshold speed, the user in the moving speed calculation step (S530) of the user in the VR content The movement speed of (Player _Modified ) becomes a predetermined player movement speed (Speed _Player ) (S530'). That is, there is no limit to the movement speed of the user in the VR content.

In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed (S510), when the current speed of the vehicle is lower than or equal to the motion sickness level threshold speed, the user's viewing angle is calculated (S520). The field of view (FOV _Modified ) is,

It is represented by (S520'').

Here, FOV _Min is set to 90 degrees as a predetermined minimum viewing angle, and Critical Speed is the critical speed of the motion sickness level.

In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed (S510), when the current speed of the vehicle is lower than or equal to the motion sickness level threshold speed, a movement speed to be limited linearly proportionally to the current speed value of the vehicle Is calculated.

In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed (S510), when the current speed of the vehicle is lower than or equal to the motion sickness level threshold speed, the user's movement speed calculation step (S530) in the VR content The user's movement speed (Player _Modified ) is,

It is represented by (S530'').

Here, Ratio _Limit is a player movement speed limit ratio, and basically has a limit of 50%.

The minimum viewing angle and the maximum viewing angle can be freely modified by the user, and the player's movement speed (Player _Modified ) is determined by the manufacturer, but the player movement speed limit ratio can be freely modified by the user.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those of ordinary skill in the relevant technical field, the spirit of the present invention described in the claims to be described later And it will be understood that various modifications and changes can be made to the present invention within a range not departing from the technical field.

S100: Background graphic rendering step of generating a dynamic background graphic using vehicle speed information and rotation information
S200: Pattern path generation step, which is a path referenced to generate background graphic patterns
S300: Background graphic pattern generation step of generating a plurality of single graphic patterns moving along the pattern path
S500: User visual information control-based rendering step of controlling the viewing angle and movement speed of the user in the content by using the vehicle speed information

Claims (25)

In a VR content design method to reduce motion sickness when using VR content for HMD (Head Mounted Display) in a vehicle,
A background graphic rendering step of generating a dynamic background graphic using the vehicle speed information and rotation information;
Including; a user visual information control-based rendering step of controlling the viewing angle and movement speed of the user in the content by using the vehicle speed information,
The background graphic rendering step,
A pattern path generation step, which is a path referenced to generate background graphic patterns; And
Including; a background graphic pattern generating step of generating a plurality of single graphic patterns moving along the pattern path; and
The pattern path (CurvedLine _pattern ) generation step,
Generating a direction vector facing a front of the vehicle (UnitVector _Forward ) and a direction vector facing an upper surface (UnitVector _Normal ) within the VR content;
Generating a sphere that is a virtual space by using the direction vector;
Including; generating a quadratic Bezier curve using an extinction point, a generation point, and a center point of the sphere located on the outside of the sphere;
VR content design method for reducing motion sickness, characterized in that. delete delete The method of claim 1,
The step of generating a quadratic Bezier curve using the extinguishing point (Position _Destroy ), the generation point (Position _Spawn ) and the center point (Position _Origin ) of the sphere located on the outside of the sphere,
Checking the rotation angle of the rear wheel of the vehicle;
Generating the extinguishing point by reflecting the rotation angle of the rear wheel;
Checking the rotation angle of the front wheel of the vehicle;
Generating the generation point by reflecting the rotation angle of the front wheel;
Generating the second order Bezier curve; VR content design method for reducing motion sickness comprising a. The method of claim 4,
If the of the rear wheel direction fixed in the step to determine the rotation angle of the rear wheels of the vehicle, wherein the extinction point is created in the step of generating the extinction point by reflecting the rotation angle of the rear wheel (Position _Destroy) is

(Where, Radius: the radius of the sphere)
VR content design method for reducing motion sickness, characterized in that. The method of claim 5,
In the step of checking the rotation angle of the rear wheel of the vehicle, if the direction of the rear wheel is not fixed, before the step of generating the extinguishing point by reflecting the rotation angle of the rear wheel,
Generating the vehicle's rear direction vector (-UnitVector _Forward ), and reflecting the rotation angle of the rear wheel (Degree _rear ) to proceed with the step of rotating the rear direction vector of the vehicle
VR content design method for reducing motion sickness, characterized in that. The method of claim 6,
A direction vector in which the rotation angle of the rear wheel generated in the step of generating the rear direction vector of the vehicle (-UnitVector _Forward ) and rotating the rear direction vector of the vehicle by reflecting the rotation angle of the rear wheel (Degree _rear ) is reflected ( UnitVector _ModifiedRear ),

Being
VR content design method for reducing motion sickness, characterized in that. The method of claim 7,
If the rear wheel direction in a non-fixed state in the step to determine the rotation angle of the rear wheels of the vehicle, wherein the extinction point is created in the step of generating the extinction point by reflecting the rotation angle of the rear wheel (Position _Destroy) is ,

Being
(Here, Radius: radius of the sphere, UnitVector _ModifiedRear : direction vector reflecting the rotation angle of the rear wheel)
VR content design method for reducing motion sickness, characterized in that. The method of claim 4,
When the direction of the front wheel is fixed in the step of checking the rotation angle of the front wheel of the vehicle, the generation point (Position _Spawn ) generated in the step of generating the generation point by reflecting the rotation angle of the front wheel is,

Being
(Where, Radius: the radius of the sphere)
VR content design method for reducing motion sickness, characterized in that. The method of claim 9,
In the step of checking the rotation angle of the front wheel of the vehicle, if the front wheel is not fixed, before the step of generating the generation point by reflecting the rotation angle of the front wheel,
Generating the vehicle's front direction vector (UnitVector _Forward ) and reflecting the rotation angle (Degree _front ) of the _front wheel to proceed with the step of rotating the front direction vector (UnitVector _Forward )
VR content design method for reducing motion sickness, characterized in that. The method of claim 10,
A direction vector in which the rotation angle of the front wheel generated in the step of generating the vehicle's front direction vector (UnitVector _Forward ) and rotating the front wheel direction vector (UnitVector _Forward ) by reflecting the degree _front of the vehicle (UnitVector _{ModifiedFront} ),

Being
VR content design method for reducing motion sickness, characterized in that. The method of claim 11,
In the step of checking the rotation angle of the front wheel of the vehicle, when the direction of the front wheel is not fixed, the generation point (Position _Spawn ) generated in the step of generating the generation point by reflecting the rotation angle of the front wheel is ,

Being
(Here, Radius: the radius of the sphere, UnitVector _{ModifiedFront} : the direction vector reflecting the rotation angle of the front wheel)
VR content design method for reducing motion sickness, characterized in that. The method of claim 1,
The background graphic pattern generation step,
Calling the pattern path generated in the pattern path generating step;
Checking a generation point (Position _PatternIndex ) of an Nth single graphic pattern among the background graphic patterns in the pattern path;
Obtaining a movement length value that is a length for the generation point of the N-th single graphic pattern to move by reflecting the vehicle speed, life cycle, and time difference;
Moving the generation point of the Nth single graphic pattern by the movement length value;
Including; checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path.
VR content design method for reducing motion sickness, characterized in that. The method of claim 13,
In the step of obtaining a movement length value that is a length for the N-th single graphic pattern to move by reflecting the vehicle speed, life cycle, and time difference, the movement length value (Length _{DifferenceValue} ) is,

Being
(Here, Velocity _Current : the current velocity value of the vehicle, Velocity _{MovingAverage} : the velocity value of the vehicle to which the moving average filter is applied, Length _Pattern : the length value of the pattern path, Tlme _Current : The background graphic pattern generation step is repeated and When the measured time, Time _Previous : The time measured when the background graphic pattern generation step first started, LifeCycle: The basic life cycle time (seconds) of the single graphic pattern)
VR content design method for reducing motion sickness, characterized in that. The method of claim 14,
In the step of checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path, when the location of the N-th single graphic pattern deviates from the pattern path,
After the step of removing the generation point of the Nth single graphic pattern, the background graphic pattern generation step is re-proceeded.
VR content design method for reducing motion sickness, characterized in that. The method of claim 14,
In the step of checking whether the generation point of the N-th single graphic pattern moved by the movement length value deviates from the pattern path, when the generation point of the N-th single graphic pattern does not deviate from the pattern path,
Checking whether the pattern path is a straight line;
Generating the N-th single graphic pattern based on a point where a plane and a world _sphere contact each other;
Comparing the total number of the single graphic pattern and the maximum number of background graphic patterns to be rendered in the sphere; in progress
VR content design method for reducing motion sickness, characterized in that. The method of claim 16,
In the step of determining whether the pattern path is a straight line, if the pattern path is not a straight line, before the step of generating the Nth single graphic pattern,
Step in the generation point of the movement length of the N-th single graphical pattern shifted by a value to obtain the slope value (Gradient _Pattern) of the path pattern;
The step of obtaining a plane including the generation point of the N-th single graphic pattern having the slope value as a normal and moved by the movement length value;
VR content design method for reducing motion sickness, characterized in that. The method of claim 16,
In the step of checking whether the pattern path is a straight line, if the pattern path is a straight line, before the step of generating the Nth single graphic pattern,
The step of obtaining a plane in which the direction vector of the pattern path is a normal line is performed at the generation point of the N-th single graphic pattern moved by the movement length value.
VR content design method for reducing motion sickness, characterized in that. The method of claim 16,
In the step of comparing the total number of the single graphic pattern and the maximum number of background graphic patterns,
When the value obtained by adding 1 to N in the Nth single graphic pattern is less than or equal to the maximum number of background graphic patterns,
In the pattern path, the step of confirming the generation point (Position _PatternIndex ) of the N+1th single graphic pattern among the background graphic patterns is in progress.
VR content design method for reducing motion sickness, characterized in that. The method of claim 16,
In the step of comparing the total number of the single graphic pattern and the maximum number of background graphic patterns,
When the value obtained by adding 1 to N in the N-th single graphic pattern is greater than the maximum number of background graphic patterns,
The VR content design method for reducing motion sickness, characterized in that the step of generating the background graphic pattern is performed again. The method of claim 1,
The user visual information control-based rendering step,
Comparing the current speed (Velocity _Current) of the vehicle and motion sickness level threshold speed;
Calculating the viewing angle of the user;
Calculating a movement speed (Player _Modified ) of the user in the VR content;
Including; reflecting the viewing angle and the moving speed of the user to the VR content
VR content design method for reducing motion sickness, characterized in that. The method of claim 21,
In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed, when the current speed of the vehicle is higher than the motion sickness level threshold speed,
In the step of calculating the viewing angle of the user, the viewing angle of the user (FOV _Modified ) is a predetermined maximum viewing angle (FOV _Max ).
VR content design method for reducing motion sickness, characterized in that. The method of claim 22,
In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed, when the current speed of the vehicle is higher than the motion sickness level threshold speed,
In the step of calculating the movement speed of the user in the VR content, the movement speed of the user (Player _Modified ) is a predetermined player movement speed (Speed _Player ).
VR content design method for reducing motion sickness, characterized in that. The method of claim 21,
In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed, when the current speed of the vehicle is lower than or equal to the motion sickness level threshold speed,
In the step of calculating the viewing angle of the user, the viewing angle of the user (FOV _Modified ) is,

Being
(Here, FOV _Min : predetermined minimum viewing angle, Critical Speed: critical speed at the motion sickness level)
VR content design method for reducing motion sickness, characterized in that. The method of claim 24,
In the step of comparing the current speed of the vehicle with the motion sickness level threshold speed, when the current speed of the vehicle is lower than or equal to the motion sickness level threshold speed,
In the step of calculating the movement speed of the user in the VR content, the movement speed of the user (Player _Modified ) is,

(Here, Ratio _Limit : player movement speed limit ratio)
VR content design method for reducing motion sickness, characterized in that.

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