JP2017033294A - Three-dimensional drawing system and three-dimensional drawing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a three-dimensional drawing system with a high degree of freedom in expression.SOLUTION: A motion capture device 20 acquires a locus of action of a tablet terminal 10 and a locus drawing unit 15 generates a locus image on the basis of the acquired position information. A browsing device 13 of the tablet terminal 10 can display the drawn locus image and the displayed locus image is converted based on the position of the tablet terminal 10. The locus image generated by the locus drawing unit 15 is combined with virtual space data by a display control unit 14 to be displayed on a screen of the tablet terminal 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a three-dimensional drawing system.

  Technologies that utilize AR (augmented reality) and VR (virtual reality) are evolving day by day, and systems that allow these experiences through various hardware have been proposed. For example, in Patent Document 1, a virtual try-on system using motion capture is presented, which is a system that captures a user and displays an image in which clothes that the user actually wears are replaced with virtual clothes. . The virtual try-on system displays a humanoid virtual object image that is an operation target operated in response to a user to be recognized, in a pose for extracting information necessary for motion capture. The present technology can be applied to, for example, an image processing apparatus that performs image processing in which AR is applied to trying on clothes.

In Patent Document 2, a virtual reality image is displayed on a surface such as a wall in an actual space, and a user wearing a head-mounted display or the like is configured to be able to perform operations on the image. A system is disclosed.

JP 2012-252437 A Special table 2014-515854 gazette

As described above, various expressions can be realized in a three-dimensional space by combining augmented reality or virtual reality technology and motion capture technology. However, although what is disclosed in the above prior art shows an operation on a preset object or the like, it has not yet been realized in a means for realizing a more flexible expression than that described above. Met.

The present invention is to solve the above-described problems, and an object of the present invention is to realize a technique that enables free expression using augmented reality and virtual reality in a three-dimensional space.

In order to solve the above-described problem, the three-dimensional drawing system according to the embodiment includes a plurality of photographing units that photograph a target space and a target object located in the space, and the target space by the photographing unit. A drawing device attached with a first marker capable of grasping the position of the image, and a user that is portable and capable of calculating an absolute position in the target space given the second marker, The browsing device having a screen that can be browsed by the user, and the position information of the trajectory of the drawing device and the position information of the browsing device acquired by being photographed by the photographing unit to the browsing device in real time. A transmitting unit for transmitting, a space generating unit for generating virtual space data similar to the actual size of the target space from the image captured by the imaging unit, and the received locus of the drawing device The object of the trajectory drawing unit that draws the trajectory image of the drawing device in the virtual space data based on the position information and the received position information of the browsing device so that the object can be viewed from the viewpoint of the browsing device. A space conversion unit that converts the virtual space data of the space, a trajectory image, and a display control unit that synthesizes the virtual space data converted by the space conversion unit and displays it on the screen. It is characterized by.

  Furthermore, the drawing apparatus includes a selection unit that can select at least one of the thickness, type, color, and texture of the line of the locus in the drawn virtual space data before drawing, and the locus drawing unit Draws the trajectory based on the type of trajectory line selected by the selection unit.

  Furthermore, the drawing apparatus includes a drawing switch that is operated when drawing is performed as hardware or software, and the trajectory drawing unit includes the drawing switch when the drawing switch is pressed. The locus is drawn, and the locus of the drawing device is not drawn when the drawing switch is not pressed.

  Further, the drawing device or the browsing device includes an erasing unit for erasing a locus drawn in the virtual space data, and the erasing unit is configured so that when an erasing operation is performed by a user, The locus drawn after the drawing switch was pressed last time is deleted.

  Furthermore, the drawing device and the browsing device are realized by a single piece of hardware, and the space generation unit converts the virtual space data from a viewpoint from a preset height as a user model, When the drawing device is moved while viewing the virtual space data projected on the screen of the browsing device, a locus of movement is drawn on the drawing device in the screen being viewed.

  Further, in the drawing device, the screen of the browsing device is configured by a touch panel display, and when drawing is performed on the screen, the drawing is performed in the virtual space data displayed on the screen. A locus of movement similar to that when the drawing apparatus is moved at the absolute position of the space corresponding to the position is drawn.

  Furthermore, the browsing device is configured so that a user can wear it on his / her head, and the drawing device is a pen-type device that the user uses in his / her hand.

  In addition, the program according to the present embodiment is a drawing in which a computer is captured by a plurality of photographing units that photograph a target space and an object located in the space, and the acquired first marker is attached. From the position information of the trajectory of the apparatus and the position information of the browsing apparatus provided with a second marker attached and a screen that can be browsed by the user in real time, and from the image photographed by the photographing section, the target A space generation unit for generating virtual space data similar to the actual size of the space to be drawn, and a locus drawing for drawing a locus image of the drawing device in the virtual space data based on the received position information of the locus of the drawing device And the virtual space of the target space so that browsing is possible from the viewpoint from the browsing device from the received position information of the browsing device A spatial transform unit for converting the over data, wherein the locus image, synthesizes the transformed the virtual space data by the spatial transform unit, a display control unit for displaying on the screen, to those to be executed.

FIG. 1 is a schematic diagram illustrating a configuration of a three-dimensional drawing system according to the first embodiment. FIG. 2 is a block diagram showing an outline of processing of the three-dimensional drawing system in the first embodiment. FIG. 3 is an image diagram of hardware of the three-dimensional drawing system according to the first embodiment. FIG. 4 is an image diagram of hardware of a three-dimensional drawing system according to another embodiment. FIG. 5 is an image diagram of hardware of a three-dimensional drawing system according to another embodiment. FIG. 6 is a block diagram illustrating a functional configuration of the three-dimensional drawing system according to the first embodiment. FIG. 7 is a flowchart showing an outline of processing related to initial setting of virtual space data of the three-dimensional drawing system in the first embodiment. FIG. 8 is a flowchart showing an outline of processing related to measurement of a drawing trajectory and generation of a trajectory image of the three-dimensional drawing system in the first embodiment. FIG. 9 is a flowchart showing an outline of processing related to virtual space data conversion of the three-dimensional drawing system in the first embodiment. FIG. 10 is a diagram illustrating an outline of an image drawn in space by the three-dimensional drawing system according to the first embodiment.

A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing a system configuration that embodies the three-dimensional drawing system of the first embodiment. The three-dimensional drawing system according to the present embodiment draws an image in the space by the user operating the tablet terminal 10 or displays an image drawn in the target space on the screen of the tablet terminal 10. It is possible to do that. In other words, by using this system, images and characters drawn in virtual reality are displayed in real time on virtual space data generated based on the actual space, and drawn in a three-dimensional space. You can get the experience you are doing.

As shown in FIG. 1, in the three-dimensional drawing system 1, a tablet terminal 10, a motion capture device 20, and an information processing device 30 are connected via a network line 40. The network line 40 may be wired or wireless, but it is desirable that the network line 40 has a sufficient line speed so that information can be transmitted and received in real time.

The tablet terminal 10 is a portable terminal having a display screen and capable of taking pictures and videos by the provided shooting unit 13a. In the present embodiment, as illustrated in FIG. 3, the tablet terminal 10 functions as a device for performing both operations of drawing an image in the space and viewing the drawn image. The user is assumed to use the drawing while moving the tablet terminal 10 while looking at the screen of the tablet terminal 10.

A plurality of motion capture devices 20 in the space for the infrared camera 21, six in the present embodiment, are installed, and the space for the retroreflective markers attached to the device that is the movement acquisition target acquired from the infrared camera 21. Is an optical motion capture system. As an example of such a motion capture device 20, for example, hardware and software provided by OptiTrack can be used. The captureable range in the case of the six infrared cameras 21 of the present embodiment is a range of about 6 m × 6 m × height 2 m. Also,
Generally, the maximum range of the space to which the service can be applied is a space of about 45 ft × 45 ft, and at least three infrared cameras are required. The number of infrared cameras needs to be increased as appropriate according to the size of the target space.

The angle of the infrared camera 21 is preferably adjusted so that the field of view of the camera overlaps at the center coordinates of the space to be captured. Further, in the present embodiment, the retroreflective marker 10a is attached to the tablet terminal 10, and a circular one is used so that reflection from all directions is uniform. Further, it is desirable that at least three or more retroreflective markers 10a are attached to the tablet terminal 10 so that each terminal can be identified from other terminals. In the present embodiment, three retroreflective markers 10a are provided at intervals. In addition, about the attachment position of the reflective marker to the tablet terminal 10, since it is necessary to attach to the position which can be seen from at least 2 or more infrared cameras 21, it is not attached as much as possible to the position where it is hidden such as the back side of the terminal. It is desirable to do so. In the present embodiment, since the browsing device and the drawing device are realized as a common tablet terminal 10, the first marker and the second marker can also be realized by a common retroreflective marker 10a.

  As shown in FIG. 2, the information processing device 30 receives the position information and the rotation information in the target space of the drawing device acquired by the motion capture device 20 and the tablet terminal 10 that is a browsing device as each tablet terminal 10. Send to. That is, the position information corresponding to the trajectory drawn by each tablet terminal 10 acquired by the motion capture device 20 is always transmitted to the tablet terminal 10 by streaming.

  FIG. 6 is a block diagram illustrating a functional configuration of the three-dimensional drawing system 1 according to the embodiment. As shown in FIG. 6, the tablet terminal 10 includes a communication unit 11, a drawing device 12, a browsing device 13, a photographing unit 13 a, a display control unit 14, a locus drawing unit 15, a space conversion unit 17, and an erasing unit 18. Yes. The tablet terminal 10 also serves as a drawing device and a browsing device. The communication unit 11 (reception unit) is a function for transmitting and receiving data using a WiFi or 4G line. The tablet terminal 10 transmits / receives data to / from the information processing apparatus 30 via the communication unit 11.

  The drawing device 12 provides the tablet terminal 10 with a user interface for drawing. In the present embodiment, since the drawing device is the tablet terminal 10, it is inconvenient if the drawing is performed only by moving the tablet terminal 10 in the space. Therefore, it is desirable that an interface for switching to a drawing mode in which drawing is performed exists, and is realized as, for example, a “draw button” displayed on the screen or an actual hardware button. As a method of mounting each button, when a button is pressed once, one stroke of drawing, that is, the movement from the start of movement until the movement is substantially stopped is traced. Alternatively, the locus of movement of the tablet terminal 10 while the button is pressed may be drawn.

  Further, as another drawing input method, when the screen of the tablet terminal 10 is a touch panel display, the drawing device 12 traces the trace drawn on the screen to the trace drawing unit 15 of the browsing device 13. Provides an interface to pass. In the case of this drawing method, drawing corresponding to the position displayed on the screen is performed instead of the absolute position in the space of the tablet terminal 10. Since the depth is not expressed on the screen, drawing is performed at a preset position, for example, 30 cm behind from the position of the tablet terminal 10.

  The browsing device 13 displays virtual space data and data obtained by combining the drawn trajectory image so that the user can browse.

  The space generation unit 16 generates virtual space data similar to the actual size of the target space from the image cut out from the image captured by the motion capture device 20. The generated virtual space data is stored in a storage area in the tablet terminal 10. The generation of the virtual space data by the space generation unit 16 is preferably performed at the first startup of the system as an initial setting when the three-dimensional drawing system is installed in a target space. Therefore, once the virtual space data generated by the space generation unit 16 is generated, it is continuously used during drawing, so that there is a change in the actual space, and the virtual space data corresponds to a change in the real space. When it is desired to do so, it is necessary to generate virtual space data again by the space generation unit 16.

  The space conversion unit 17 can be viewed from the viewpoint from the tablet terminal 10 based on information such as position information in the space of the tablet terminal 10 that is the browsing device acquired by the motion capture device 20 and rotation information. That is, the virtual space data is converted so that the scenery in the space seen through the photographing unit 13a of the tablet terminal 10 is obtained. Details of this will be described later.

  The locus drawing unit 15 performs a process of generating a locus image drawn by operating the tablet terminal 10. Specifically, a position vector corresponding to position information and rotation information of the retroreflective marker 10a attached to the tablet terminal 10 acquired by the motion capture device 20 is calculated, and the locus of the tablet terminal 10 is calculated based on the position vector. A trajectory image is generated in the virtual space data. The trajectory drawing unit 15 also determines whether or not drawing has been performed in the drawing mode in which drawing is performed by the user's operation on the tablet terminal 10. Therefore, the trajectory drawing unit 15 performs drawing only by operating the drawing device 12 when the drawing mode is set.

  Further, the trajectory drawing unit 15 can select at least one of the line thickness, type (solid line, broken line, etc.), color, and texture of the trajectory image when drawing provided in the drawing device 12 before drawing. An input from a simple interface (selection unit) is received, and a trajectory image is generated according to the line type based on the input.

The display control unit 14 controls the aspect of the display image on the screen of the browsing device 13. Specifically, control is performed so that the virtual space data constantly converted by the space conversion unit 17 and the trajectory image generated by the trajectory drawing unit 15 are combined and displayed on the screen of the browsing device 13.

The erasing unit 18 performs a process of erasing the trajectory image generated by the trajectory drawing unit 15 and may be provided in either the browsing device 13 or the drawing device 12 as a user interface. When the erasing operation is performed, the erasing unit 18 erases the drawn image drawn by the locus drawing unit 15. At this time, the unit of the locus image to be deleted may be a locus for drawing for one stroke drawn in one drawing mode or a locus drawn within a predetermined time. Alternatively, after selecting a region of the trajectory image to be erased on the screen, the trajectory image existing in this region may be erased.

The screen of the browsing device 13 is provided with the photographing unit 13a on the surface opposite to the screen, and the virtual space data and the trajectory image synthesized by the display control unit 14 are displayed on the screen in real time. Further, instead of displaying the virtual space data, it is possible to draw the space image captured by the image capturing unit 13a and display the data.

FIG. 10 is a diagram illustrating an example of a trajectory image actually drawn in the space. As shown in FIG. 10, the trajectory image 70 is drawn by the tablet terminal 10 in the target space. As shown in the figure, when the tablet terminal 10 is positioned on the front side of the trajectory image 70, the state of the trajectory image 70 viewed from the front is displayed on the screen of the tablet terminal 10 and is positioned on the side surface side. In doing so, the state of the trajectory image 70 viewed from the side is displayed. The conversion of the display mode of the trajectory image according to the position of the tablet terminal 10 is processed by the space conversion unit 17.

  The motion capture device 20 includes an infrared camera 21, a processor 22, a storage unit 23, and a communication unit 24. The position information of the tablet terminal 10 acquired by the infrared camera 21 is converted into position information in the space by the processor 22 and transmitted to the information processing apparatus 30 through the communication unit 24.

  The information processing apparatus 30 includes a communication unit 31 (transmission unit), an input unit 32, and a storage unit 33. The communication unit 31 transmits and receives data to and from the motion capture device 20 and the tablet terminal 10 through a network line. The input unit 32 inputs each received data to each unit. The storage unit 33 stores received data and data obtained by processing each unit with respect to the received data.

  FIG. 7 is a flowchart showing a flow of processing for generating virtual space data. The processing in FIG. 7 is performed when the motion capture device 20 is installed and a space for initial drawing is set. As shown in FIG. 7, first, the motion capture device 20 inputs the size of the capture target range acquired by the infrared camera 21 to the information processing device 30 (step S <b> 101). As a method for setting the target space, a calibration pole is installed vertically so as to surround a predetermined photographing range, and the camera setting position is set so that the calibration pole can be seen from two or more infrared cameras 21. Set by adjusting.

  The installed calibration pole is photographed by the infrared camera 21, and a distance indicating the size of the space in the photographing range and an image of the space itself are acquired and input to the information processing apparatus 30. The space generation unit 16 generates virtual space data that is a virtual environment based on the input dimensions of the space to be imaged (step S102). The space generation unit 16 further sets a viewpoint based on the virtual space data in order to set the position from which the generated virtual space data is viewed as a viewpoint (step S103).

  Finally, the space generation unit 16 converts the virtual space data into the first-person viewpoint on the front side of the user that is the basis (step S104).

  Next, a flow of image processing of a drawn locus by the tablet terminal 10 that is a drawing apparatus will be described with reference to FIG. This process is a process flow from the setting of the drawing mode to the end of the tablet terminal 10 which is a drawing apparatus in the present embodiment. First, the trajectory drawing unit 36 obtains the current position information and rotation information (4 × 4 matrix) of the retroreflective marker attached to the tablet terminal 10 that is the drawing device acquired by the motion capture device 20 as the information processing device 30. (Step S201).

  Next, the locus drawing unit 36 calculates a three-dimensional position vector and a quaternion rotation vector based on the read current information and rotation information (step S202). Then, the trajectory drawing unit 36 forms a polygon along the trajectory using the three-dimensional position vector as a new vertex normal vector, and draws a trajectory image using the polygon (step S203). In this embodiment, the polygon used for drawing the trajectory is set as a preset color, thickness, and line type. This is a polygon that is changed and selected by the user interface provided on the drawing apparatus side. The line type of the drawn image is appropriately changed with reference to the drawing information.

  Then, the locus drawing unit 36 connects the newly generated polygon and the past polygon to form a mesh (step S204). The past polygon at this time is a polygon generated by the previous drawing stored. Then, the trajectory drawing unit 36 determines whether or not drawing has been completed (step S205). Completion of drawing may be determined by the completion operation of the drawing mode described above, or drawing may be automatically completed after a predetermined time has elapsed, or drawing may be completed when a predetermined stroke is completed. It may be.

  If it is determined that the drawing has been completed (step S205: Yes), the trajectory drawing unit 36 outputs the object file and completes the process (step S206). On the other hand, when it is determined that the drawing is not completed (step S206), the drawing process from step S201 is repeated again.

  Next, the virtual space data conversion process in the browsing device by the space conversion unit 17 and the display control unit 14 will be described with reference to FIG. Although FIG. 7 shows a process related to the generation of the initial virtual space data, this process is a process performed in real time because the browsing apparatus changes its position and rotation information in the space.

  First, the motion capture device 20 acquires current position information and rotation information from the retroreflective marker 10a attached to the tablet terminal 10 that is the browsing device 13 (step S301). Next, the space conversion unit 17 acquires virtual space data and an object file that is trajectory information (step S302). Then, the space conversion unit 17 and the display control unit 14 combine the virtual space data and the object file of the trajectory image, and convert the virtual space data based on the acquired position information and rotation information of the browsing device ( Step S303). Then, the last display control unit 14 displays the converted virtual space data on the screen of the tablet terminal 10.

  In the three-dimensional drawing system of the present embodiment described above, the user can draw on a three-dimensional space by operating the drawing device 12, and the trajectory image drawn through the browsing device 13. Can be viewed in the virtual space data. Conventional three-dimensional graphics can only be drawn and viewed on a computer screen, but in this system, there is a depth in the actual space by moving the drawing device 12 in the actual space. A trajectory image can be drawn, and an expression with a high degree of freedom is possible. For example, since the trajectory image drawn by this system is converted into an image viewed from the position when the user moves in the space, for example, there are various attractions such as attractions at amusement parks, games using virtual reality, etc. It can be used for various purposes.

  For example, if a three-dimensional sculpture is drawn in the space, a visual effect as if the sculpture exists in the actual space can be obtained as well as the user wearing the browsing device 13. In addition, by making it possible to select the type of line for generating a trajectory image before drawing, the range of expression can be further expanded. In addition to freehand drawing, it is also possible to perform an expression such as, for example, arranging in a space while moving a locus of a predetermined figure such as a figure, a stamp, or a character.

  In addition, the drawn locus image can be erased. At this time, it is difficult to designate and erase a drawing drawn in a three-dimensional actual space. Therefore, a portion of a trajectory image drawn by the previous operation is set in advance as an erasure target. By doing so, it becomes possible to easily perform the process related to erasure.

  In addition to drawing by moving the tablet terminal 10 itself, which is a drawing device, it is possible to draw by touching the screen of the tablet terminal 10 being a browsing device. It is possible to increase the degree of freedom of expression by drawing using a pen tablet or the like on the screen. At the time of drawing, the position where the locus drawing is generated is set in advance such as a position 30 cm in depth from the tablet terminal 10, but this is, for example, a locus image on the screen with a pen tablet or the like. When is selected, it is possible to automatically adjust the depth position of the selected trajectory image to generate a trajectory drawing.

  In the first embodiment, an example in which the drawing device and the browsing device are realized as the same tablet terminal 10 has been described. However, for example, as illustrated in FIG. The configuration may be divided into the device 50. In this case, the drawing device 50 is a terminal that is easier to carry than a smartphone, a small tablet, a pen tablet-type terminal, or the like, and can easily perform drawing with one hand. In this case, since the selecting unit and the erasing unit are provided in the drawing device 50, it is necessary to transmit and receive signals for these operations between the drawing device 50 and the tablet terminal 10.

  Further, as shown in FIG. 5, the usage method may be such that the head-mounted display type browsing device 60 is worn on the head. In this case, it is not necessary to carry the browsing device 60 by hand. You will be able to get an experience of doing. In addition, as in the above embodiment, it is not necessary that the drawing and browsing are necessarily the same, and a plurality of people each have a terminal, and each draws and browses in the same space. Various usage modes may be used.

  The tablet terminal 10 includes a hard disk, which is a storage area in which various programs are stored, and a storage area such as a RAM that is executed by the program. Each unit described in the above embodiment functions as a program in each unit. To do.

DESCRIPTION OF SYMBOLS 1 ... Three-dimensional drawing system, 10 ... Tablet terminal, 12 ... Drawing apparatus 12 ... Browsing device, 14 ... Display control part, 15 ... Trajectory generation part, 16 ... Space generation part, 17 ... Space conversion part, 18 ... Erase part, 20 ... motion capture device, 30 ... information processing device

Claims (8)

A plurality of photographing units for photographing a target space and a target object located in the space;
A drawing device to which a first marker capable of grasping a position in the target space is attached by the photographing unit;
A browsing device provided with a screen that can be carried by the user, is capable of calculating an absolute position in the space to which the second marker is attached, and is viewable by the user;
A transmission unit that transmits the position information of the trajectory of the drawing device acquired by being photographed by the photographing unit and the position information of the browsing device to the browsing device in real time;
A space generation unit that generates virtual space data similar to the actual size of the target space from the image captured by the imaging unit;
A locus drawing unit for drawing a locus image of the drawing device in the virtual space data based on the received position information of the locus of the drawing device;
From the received positional information of the browsing device, a space conversion unit that converts the virtual space data of the target space so that browsing is possible from the viewpoint from the browsing device;
A display control unit configured to synthesize the trajectory image with the virtual space data converted by the space conversion unit and display the combined image on the screen;
A three-dimensional drawing system comprising: The drawing apparatus includes a selection unit that can select at least one of the thickness, type, color, and texture of a trace line in the drawn virtual space data before drawing,
The three-dimensional drawing system according to claim 1, wherein the trajectory drawing unit draws the trajectory based on a type of trajectory line selected by the selection unit. The drawing apparatus includes a drawing switch that is operated when drawing, as hardware or software,
The locus drawing unit draws a locus of the drawing device when the drawing switch is pressed, and does not draw a locus of the drawing device when the drawing switch is not pressed. The three-dimensional drawing system according to claim 1 or 2. The drawing device or the browsing device includes an erasing unit for erasing a locus drawn in the virtual space data,
The three-dimensional drawing system according to claim 3, wherein the erasing unit erases a locus drawn after the drawing switch was pressed last time when an erasing operation is performed by a user. The drawing device and the browsing device are realized by one piece of hardware,
The space generation unit performs the conversion from a viewpoint from a preset height as the virtual space data as a user model,
The movement trajectory is drawn on the drawing device in the screen when the drawing device is moved while viewing the virtual space data displayed on the screen of the browsing device. The three-dimensional drawing system as described in any one of -4. In the drawing device, the screen of the browsing device is configured by a touch panel display, and when drawing is performed on the screen, the drawing device corresponds to the position drawn in the virtual space data displayed on the screen. The three-dimensional drawing system according to claim 5, wherein a movement locus similar to that when the drawing apparatus is moved is drawn at an absolute position of a space to be drawn. The browsing device is a configuration that a user can wear on the head,
The three-dimensional drawing system according to any one of claims 1 to 4, wherein the drawing device is a pen-type device that a user uses in his / her hand. Computer
The position information of the trajectory of the drawing apparatus to which the acquired first marker is attached and the second marker are captured by a plurality of imaging units that capture the target space and the object located in the space. A receiving unit for receiving in real time the position information of the browsing device provided with a screen that is attached and can be viewed by the user;
A space generation unit that generates virtual space data similar to the actual size of the target space from the image captured by the imaging unit;
A locus drawing unit for drawing a locus image of the drawing device in the virtual space data based on the received position information of the locus of the drawing device;
From the received positional information of the browsing device, a space conversion unit that converts the virtual space data of the target space so that browsing is possible from the viewpoint from the browsing device;
A display control unit configured to synthesize the trajectory image with the virtual space data converted by the space conversion unit and display the combined image on the screen;
3D drawing program to be executed.