WO2013173948A1

WO2013173948A1 - Method and device for spatially positioning object in three-dimensional virtual reality scene

Info

Publication number: WO2013173948A1
Application number: PCT/CN2012/001258
Authority: WO
Inventors: 任伟峰
Original assignee: Ren Weifeng
Priority date: 2012-05-25
Filing date: 2012-09-12
Publication date: 2013-11-28
Also published as: CN102722908B; CN102722908A

Abstract

Provided are a method and device for spatially positioning an object in a three-dimensional virtual reality scene. The method includes the steps of: acquiring the drive data generated by manipulating an object in a three-dimensional virtual reality scene by external equipment which is capable of acquiring three-axial drive data (21); converting the drive data into a three-axial motion offset (22); and judging whether the motion offset is 0, and moving the object, the motion offset of which is not 0, for components of three axes to achieve positioning of same (23).

Description

Object space positioning method and device in three-dimensional virtual reality scene

The present invention relates to the field of virtual reality applications, and in particular, to an object space positioning method and apparatus in a three-dimensional virtual reality scene.

Background technique

The rapid development of computer image technology has made great progress in 3D virtual reality technology. The difference between two-dimensional and three-dimensional motion, see Figure 1. In two-dimensional space, we have two coordinate axes (Y), which we call a plane. The three-dimensional space, which is what we call the three-dimensional space, is the space consisting of the three axes of X, Y, and Z, namely the abscissa, ordinate, and vertical coordinates. If we want to determine the position of an object in these two spaces, we only need to specify the coordinates of each axis of the object. But the process is implemented on a computer by computer graphics. The result may not be so simple. For the two-dimensional space, because the display we use is also two-dimensional, we only need to map our two-dimensional space to the computer monitor. On the top, we can still get a virtual two-dimensional space, the movement and rotation of the two-dimensional space are on a plane. However, if the three-dimensional space is rendered in a two-dimensional display, the content of the extra axis will need to be re-calculated by the perspective projection to be finally displayed on the display.

In such a two-dimensional display, it is more complicated to move the three-dimensional object displayed on it. First, the mouse can only move on the plane of the display and cannot penetrate inside the display. In this case, we It is not possible to zoom in and out of a three-dimensional object along the depth of the display. It is impossible to achieve multi-axial operation in a three-dimensional space by placing an object as we are in the real world. Second, the rotation of an object in three-dimensional space is also multi-axial. Therefore, at present, the operation of three-dimensional scenes in a two-dimensional display is performed by means of multi-view switching, that is, a three-dimensional scene is viewed from different axial directions, and multiple axial observation views are generated, so that The axis that is observed is omitted, and the three-dimensional is reduced to two-dimensional processing. By performing position adjustment on each two-dimensional view, the object space in the three-dimensional virtual reality scene is accurately positioned. However, the object space positioning method in the three-dimensional virtual reality scene needs to be separately adjusted on multiple two-dimensional views to realize the object space placement. For the designer, the operation is very inconvenient and the design time is wasted. Summary of the invention

In view of the above, the present invention provides a method for spatially arranging objects in a three-dimensional virtual reality scene, which is generated by acquiring an external device that can obtain three axial driving data to manipulate an object in a three-dimensional virtual reality scene. Driving the data, and then converting the driving data into motion offsets, including the moving offset and the rotating offset, thereby realizing accurate positioning of the object space in the three-dimensional virtual reality scene only in the three-dimensional view. The specific steps of the method are:

1. Acquiring an external device that can obtain three axial driving data to control driving data generated by an object in a three-dimensional virtual reality scene;

2. Converting the above driving data into three axial motion offsets;

3. Determine whether the motion offset is 0, and perform three axial component motions on the object whose motion offset is not 0 to achieve the position.

Step 1 manipulates the objects in the 3D virtual reality scene in the 3D view, and other views are only used as visual references.

The driving data of the three axes is the driving data of the three axial directions of the horizontal X-axis and the vertical Y-axis of the plane of the screen and the Z-axis of the plane of the vertical screen.

The invention provides an object space arranging device in a three-dimensional virtual reality scene. The device specifically includes:

a reading unit: configured to read, from the device driving interface, an external device that can acquire three axial driving data to manipulate driving data of an object in the three-dimensional virtual reality scene, and send the driving data to the conversion unit;

a conversion unit: a final three axial motion offsets of the object for converting the driving data into a three-dimensional virtual reality scene, and transmitting the final three axial motion offsets to the positioning unit;

Positioning unit: Used to perform three-axis component motion on an object with a motion offset other than 0 to achieve an update of the spatial position and angle of the object.

The invention acquires driving data by moving an object in a three-dimensional virtual reality scene by an external device, converts a moving offset and a rotation offset of the object, and performs three axial movements and rotations on the object whose offset is not zero. The invention realizes that the object can be accurately positioned on the object space in the three-dimensional virtual reality scene only by the object in the three-dimensional view, and the other views are only used as the visual reference object pendulum. The position of the bit operation can be in place; thus shortening the design time of the designer of the three-dimensional virtual reality scene and reducing the workload.

Appendix B

Figure 1 is a legend of the difference between two-dimensional and three-dimensional space operations;

2 is a step-by-step illustration of an object space positioning method in a three-dimensional virtual reality scene; FIG. 3 is a diagram illustrating a method of making a lever rod when an external device is a joystick;

Figure 4 is a step-by-step illustration of the conversion drive data to three axial motion offsets when the external device is a joystick;

Figure 5 is a legend of an external device as a three-dimensional mouse;

Figure 6 is a diagram showing the steps of converting the drive data into three axial motion offsets when the external device is a three-dimensional mouse;

FIG. 7 is a composition diagram of an object space arranging device in a three-dimensional virtual reality scene. detailed description

The embodiments of the present invention are further described in detail below with reference to the drawings and specific embodiments.

The invention provides an object space positioning method in a three-dimensional virtual reality scene, which acquires driving data generated by an object in a three-dimensional virtual reality scene by acquiring an external device that can obtain three axial driving data, and then The driving data is converted into a motion offset, including the moving offset and the rotational offset of the object, thereby realizing accurate positioning of the object space in the three-dimensional virtual reality scene only in the three-dimensional view. Referring to Figure 2, the specific steps of the method are as follows:

Obtaining, by an external device that obtains three axial driving data, driving data generated by an object in a three-dimensional virtual reality scene;

22. Converting the above driving data into three axial motion offsets;

23. Determine whether the motion offset is 0, and perform motion of three axial components on the object whose motion offset is not 0 to achieve the position.

In step 21, an external device is used to manipulate an object in a three-dimensional virtual reality scene, which is to solve the technical problem that an object in a three-dimensional virtual reality scene realizes three-dimensional depth movement and rotation on a two-dimensional screen. The three axial drive data external devices obtain three axial drive data, and the converted drive data is three axial motion offsets, including the mobile offset and By rotating the offset, three axial movements and rotations in the horizontal, horizontal, and vertical directions can be obtained. Therefore, the designer uses the external device to manipulate the objects in the three-dimensional virtual reality scene only in the three-dimensional view, so that the object can be placed deep into the display, and other views are only used as visual reference objects. The position of the position is in place.

In the step 21, the external device communicates with the computer through the device driving interface, and when the external device manipulates the movement of the object in the three-dimensional virtual reality scene, the driving data is transmitted to the interface.

The driving data in step 21 is obtained by reading data of an external device and a computer communication interface.

In an embodiment of the present invention, the external device in which the three axial driving data can be obtained as described in step 21 can use an external device such as a joystick, see FIG. 3, the working method and state of the external device:

First define the screen space: the plane where the screen is located is the horizontal X axis and the vertical Y axis, and the vertical screen is the Z axis;

The action of the joystick that controls the state of the object moving in the real physical space along the horizontal plane is defined as the movement of the object in the three-dimensional virtual reality scene in the horizontal plane of the three-dimensional virtual reality scene, wherein the three-dimensional virtual reality surface level is defined above. The plane of the X-axis and the Z-axis of the screen space; the operation of the joystick in the state of the controlled object moving in the direction of the vertical horizontal plane in the real physical space is defined as the movement of the object of the three-dimensional virtual reality scene in the vertical horizontal direction of the three-dimensional virtual reality scene, wherein The vertical horizontal direction of the three-dimensional virtual reality scene is the Y-axis of the screen space defined above;

The rotary arm is defined as the selected object and rotated while the object is selected.

In the embodiment of the present invention using the joystick, the specific implementation method of step 22 is shown in the figure.

4:

401: The driving data obtained in step 22 is a 6-element array obtained from step 21: the first three elements of the array correspond to a moving offset vector of the three-dimensional virtual reality scene object, and the last three elements of the array correspond to the three-dimensional virtual reality scene object. The rotation shifts the vector, and each element of the array described above is an integer value.

The step 22 converts the driving data into three axial motion offsets, including a moving offset and a rotational offset, because the amount of movement and rotation in the three-dimensional scene can use floating point numbers (ie, With decimal point data) to achieve a more precise position operation, after this conversion step, the integer value offset can be converted to a more accurate offset with floating point number. Calculated by this concrete example, specifically:

Now assume that the amount of movement of the external device joystick in the X-axis direction is X, then the value in the positive direction is x, and the value in the negative direction is -X, which is expressed as mx (then mx can be positive) It can be negative and 0); Similarly, it is assumed that the amount of movement of the external device along the Y-axis direction is expressed as my (then can be positive or negative and 0); similarly, the movement of the external device along the Z-axis is assumed. The quantity is expressed as mz (then mz can be positive or negative and 0);

Assuming that the amount of rotation of the external device along the X axis is X, the value rotated to the right is X, the value rotated to the left is -X, and it is represented as rx (then rx can be positive or negative and 0) Similarly, assume that the amount of rotation of the external device along the Y axis is expressed as ry (then iy can be positive or negative and 0); similarly, the amount of rotation of the external device along the Z axis is expressed as rz (then rz can Positive numbers can also be negative and 0);

402: The first three elements of the array are represented by a moving offset vector M (mx, my, mz);

403: Assume that the maximum range of the external device movement is L, the moving offset vector / the maximum amount of the external device, that is, the moving offset percentage M' = M L;

404: Suppose the scene size is S, the moving offset percentage / scene size, that is, the corrected moving offset vector is obtained IT = IT XS;

405: Convert the millimeter unit into the correction value of the meter unit, because the unit is generally meters in the three-dimensional virtual reality scene, and the motion offset vector X 0. 001 is corrected, that is, the final motion offset vector is obtained.

M" is the moving offset of the corresponding 3D virtual reality scene that is ultimately needed.

406: The last three elements of the array are represented by a rotation offset vector R (rx, ry, rz);

407: Assume that the maximum range of rotation of the external device is T, the rotation offset vector / the maximum amount of the external device, that is, the percentage of the rotation offset is obtained R' = R / T;

408: R' is the rotational offset of the corresponding 3D virtual reality scene that is ultimately needed.

In another embodiment of the present invention, the external device in which the three axial driving data can be obtained in step 21 can also use an external device such as a three-dimensional mouse. Referring to FIG. 5, the working method and state of the external device:

First we define the screen space: the plane of the screen is the horizontal X axis and the vertical Y axis, vertical screen The plane of the curtain is the Z axis;

The operation of smoothly moving the mouse while not selecting the object is defined as moving the cursor and not moving the object;

The simultaneous movement of the selected object by pressing the left mouse button is defined as the object in the selected three-dimensional virtual reality scene and the object moves in the horizontal plane of the three-dimensional virtual reality scene, wherein the horizontal plane of the three-dimensional virtual reality scene is the X of the screen space defined above. The plane in which the axis and the Z axis are located;

The simultaneous movement of the selected object by pressing the right mouse button is defined as selecting an object in the three-dimensional virtual reality scene and the object is rotated in the three-dimensional virtual reality scene;

The scroll wheel middle key is defined to move the object in the selected three-dimensional virtual reality scene in a vertical horizontal direction in the three-dimensional virtual reality scene, wherein the vertical horizontal direction of the three-dimensional virtual reality scene is the Y-axis of the screen space defined above.

In the embodiment of the present invention using a three-dimensional mouse, the specific implementation method of step 22, see Figure 6:

601: wherein the three axial driving data obtained in step 22 are four data packets when acquired from step 21, the first data packet includes the left, middle, and right mouse states respectively, the state value 0 indicates release, and 1 indicates press The second packet represents the amount of moving pixels in the X-axis direction; the third packet identifies the amount of moving pixels in the Y-axis direction; and the fourth packet represents the amount of moving pixels in the Z-axis direction.

The step of converting the above driving data into three axial motion offsets, including the moving offset and the rotational offset, is to convert from the pixel amount to the size and speed based on the three-dimensional view window. Transfer amount. The conversion step is calculated in this specific embodiment, specifically:

602: Converting from the pixel amount to three axial offsets based on the size of the three-dimensional view window: It is assumed that the amount of pixels of the external device mouse moving along the X-axis direction is x, and the amount of pixels moving in the Y-axis direction is y, The scrolling pixel of the key is z; the size of the 3D view window is width w, height h:

Then the offset is:

Off— X = X / W;

Off_y = y/ h;

ofF z = z / w; or off_z = z / h; The reason why Off-Z can be Z / W or Off-Z = ZI h is that the width and height of the three-dimensional view window are not much different in actual application, and then the ratio of the Z-moving pixel is compared with it, and finally The difference in results is small for the offset and can be ignored.

Converts from three axial offsets based on the dimensions of the 3D view window to offsets based on moving speed and rotational speed:

603: The calculation of the movement offset is:

The three axial offsets based on the size of the three-dimensional view window are represented by a vector M(off_x, off_j, off_z); assuming that the moving speed is ms, the object moving vector corresponding to the three-dimensional virtual reality scene is M' = M Xms;

M' is the moving offset of the corresponding 3D virtual reality scene that is ultimately needed.

604: Determine whether to press the right button;

605: If not, the rotation offset is 0;

606: If yes, it means that the object has a rotating state at this time, and the three axial offsets based on the size of the three-dimensional view window are simultaneously regarded as the three axial rotational offsets based on the size of the three-dimensional view window.

Then the rotation offset is calculated as:

The three axial offsets based on the size of the three-dimensional view window are represented by a vector M (off_rx, off-ry, off-rz); assuming that the rotational speed is rs, the object rotation offset vector corresponding to the three-dimensional virtual reality scene is R= MXrs;

R is the rotational offset of the corresponding 3D virtual reality scene that is ultimately needed.

Step 23 determines the motion offset of the final three-dimensional virtual reality scene acquired from step 22, including the motion offset and the rotation offset, and performs X-axis, y-axis, and z-axis on the object whose final offset is not zero. The movement and rotation of the three axial components to achieve the update of the spatial position and angle of the object; for the updating of the spatial position and angle of the object, methods commonly used in various three-dimensional virtual reality scene modeling software can be used, such as:

Move: translateO function implementation.

Rotation: Three functions: X axis: itch (x) ; y axis - ' yaw (y); z axis. ' roll (z) .

The implementation details of these functions belong to the prior art of mathematics and computer graphics theory and are no longer fascinating. Step 23: The motion of the three axial components of the object whose motion offset is not 0 is specifically displayed in the 3D view S and the other view S, that is, in addition to the 3D view® window, other view windows: Other views of the center, such as the top view, the left view, and the rear view, are simultaneously adjusted according to the motion offset of the selected object, so that when the selected object is moved, the content displayed in the sub-view follows the change, and the operator can Constantly confirm whether the position of the object is in place.

The invention provides an object space arranging device in a three-dimensional virtual reality scene. See picture

7, the device specifically includes:

Conversion unit: the final three axial motion offsets of the object used to convert the falsified data into a three-dimensional virtual reality scene, and send the final three axial motion offsets to the aligning unit ;

The external device of the reading unit may be a game level bar or a three-dimensional mouse.

The conversion step without the conversion step is the same as the conversion step in the embodiment of the above method, and is no longer obscured.

It should be noted that, in this context, relationship language such as first and second is only used to distinguish one entity or operation from another entity or operation, and does not necessarily require or imply these entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "including", "comprising" or "comprising" or "comprising" are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. In the absence of further limitations, the terms "comprising a", "comprising", and <RTIgt;</RTI><RTIgt;</RTI><RTIgt;</RTI> do not exclude the presence of additional identical elements in the process, method, article, or device. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

claims

1. A method of spatial placement of objects in a three-dimensional virtual reality scene, which is characterized by:

1.1. Obtain the driving data generated by an external device that can obtain three-axis driving data to control objects in a three-dimensional virtual reality scene;

1.2. Convert the above drive data into motion offsets in three axes;

1.3. Determine whether the motion offset is 0, and perform three axial component movements on the object whose motion offset is not 0 to achieve positioning.

2. The method according to claim 1, characterized in that the driving data is generated by operating an object in a three-dimensional view through an external device.

3. The method according to claim 1, characterized in that step 1.3 performs the movement of three axial components on the object whose movement offset is not 0, and specifically displays the movement in a three-dimensional view and other views.

4. The method according to claim 1, characterized in that the external device is a joystick.

5. The method according to claim 4, characterized in that the driving data is obtained through the following specific operations of a joystick:

The operation of the joystick in the state of controlling an object moving along the horizontal plane in the real physical space is defined as the movement of the object in the three-dimensional virtual reality scene on the horizontal plane of the three-dimensional virtual reality scene;

The operation of the joystick in the state of controlling an object moving in the vertical and horizontal direction in the real physical space is defined as the movement of the object in the three-dimensional virtual reality scene in the vertical and horizontal direction of the three-dimensional virtual reality scene;

Clicking on the selected object while rotating the joystick is defined as selecting the object and rotating it.

6. The method according to claim 4, characterized in that step 1.2 converts the above-mentioned driving data into motion offsets in three axes, specifically:

The motion offset is divided into a movement offset and a rotation offset;

The movement offset is obtained by the following formula:

The movement offset = corrected movement offset vector X0.001;

Among them, the movement offset percentage = the movement offset vector / the maximum range of the external device;

Corrected movement offset vector = movement offset percentage / scene size;

The rotation offset is obtained by the following formula: The rotation offset = rotation offset percentage;

Among them, rotation offset percentage = rotation offset vector / maximum range of the external device.

7. The method according to claim 1, characterized in that the external device is specifically a three-dimensional mouse.

8. The method according to claim 7, wherein the driving data is obtained through the following operations of a three-dimensional mouse:

The operation of moving the mouse smoothly without clicking on the selected object is defined as moving the cursor without moving the object;

The simultaneous movement of selected objects by pressing the left mouse button is defined as selecting an object in a three-dimensional virtual reality scene and moving the object in the horizontal plane of the three-dimensional virtual reality scene;

The movement of the selected object while pressing the right button of the mouse is defined as selecting an object in the three-dimensional virtual reality scene and the object rotating in the three-dimensional virtual reality scene;

The middle button of the scroll wheel is defined to move the selected object in the three-dimensional virtual reality scene in the vertical and horizontal direction in the three-dimensional virtual reality scene.

9. The method according to claim 7, characterized in that step 1.2 converts the above-mentioned driving data into motion offsets in three axes, specifically:

The motion offset is divided into a movement offset and a rotation offset;

The movement offset is obtained through the following steps:

Convert from pixel amount to three axial movement offsets based on the size of the 3D view window: Horizontal axis coordinate = pixel amount moved on the horizontal axis / width of the 3D view window;

Vertical axis coordinate = amount of pixels moved along the vertical axis/height of the 3D view window;

Vertical axis coordinate = pixel amount moved on the vertical axis / width of the 3D view window, or vertical axis coordinate = pixel amount moved on the vertical axis / height of the 3D view window;

Convert from three axial offsets based on the 3D view window size to movement offsets based on movement speed:

The three axial offset vectors consist of horizontal axis coordinates, vertical axis coordinates, and vertical axis coordinates;

The movement offset = three axial offset vectors X movement speed;

Determine whether it is a rotating state. If not, the final rotation offset is 0. If so, the rotation offset is obtained by the following formula: The rotational offset = the three axial offset vectors X rotational speed.

10. An object space positioning device in a three-dimensional virtual reality scene, characterized in that the device specifically includes:

Reading unit: used to read the drive data of an external device that can obtain three-axis drive data from the device driver interface to manipulate objects in the three-dimensional virtual reality scene, and send the drive data to the conversion unit;

Conversion unit: used to convert the driving data into the final three-axis motion offsets of the object in the three-dimensional virtual reality scene, and send the final three-axis motion offsets to the positioning unit;

Positioning unit: Used to move objects whose motion offset is not 0 in three axial components to update the spatial position and angle of the object.

11. The device according to claim 10, characterized in that the external device may be a joystick or a three-dimensional mouse.

12. The method according to any one of claims 1 to 9, characterized in that the three axes are: the horizontal X axis and the longitudinal Y axis of the plane where the screen is located, and the vertical Z axis of the plane where the screen is located.