JPH09106412A - Method for switch-displaying building illuminating state by means of computer graphic picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a building by switching its illuminating state to plural kinds such as in the daytime or at night. SOLUTION: Three-dimensional shape data concerning the building Z is prepared by means of a CAD system in advance and in displaying the building Z as a computer graphic picture, based on three-dimensional shape data, illumination calculation for displaying the building Z in plural different kinds of illuminating states is executed to generate plural kinds of three-dimensional shape data corresponding to illumination. Then based on these pieces of three- dimensional shape data corresponding to illumination, the building Z is displayed by switching its illumination state to plural kinds.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to displaying a building such as a building schedule by a CG image based on three-dimensional shape data created in advance by a CAD (Computer-aided design) system. CG that can be displayed by switching the lighting status to multiple types, such as at night
The present invention relates to a lighting state switching display method of a building by an image.

[0002]

2. Description of the Related Art In recent years, in designing a house to be newly built, it has become common practice to individually consider and determine the building style, floor area, floor plan, etc. in accordance with site conditions, customer requests, and the like. In that case, it is difficult to get a concrete image of the details of the house by only showing the design drawings to the customer, and if construction is started with the details of the structure obscured, the completed house will be what the customer imagined. There may be subtle differences.

[0003] Therefore, conventionally, as a result of consultation and consideration with a customer, when a preliminary design of a house to be constructed is completed, a reduced model of this house is created, a photograph is taken of this, and a computer is imaged by an image scanner or the like. Or type
Image data of the house to be built is created by a CAD system, and the house is CR based on the image data.
An image creation and display method that can be displayed on a screen such as T has been proposed (see Japanese Patent Laid-Open No. 5-78699).

The work of selecting various surface materials of the house, that is, the colors and patterns of the outer wall, the wallpaper, the floor material, etc., according to the taste of the customer is usually carried out by using a photograph or a minute sample of these surface materials. However, as a more realistic method, it is conceivable to display the surface material on a screen based on image data created by CAD in advance and evaluate it on this screen. In this case, the surface material can be compared with other components of the house to determine whether or not the surface material matches other components.

[0005]

By the way, conventionally, CA
Based on the image data of D, what is displayed on the screen is usually a predicted image of the completion of the house under sunlight in the daytime, but in general, surface materials such as outer walls and wallpaper are used for daytime. The impression seen under the sunlight was different from the impression seen under the illumination by the lighting equipment at night. For example, under the sunlight in the daytime, the color and pattern of the surface material had a favorable impression. In some cases, it may not always be possible to obtain a favorable impression under night lighting. Therefore, there is a problem that it is difficult to accurately and sufficiently evaluate the surface material and the like only by displaying the expected completion image of the house under the single illumination condition on the screen.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to enable a building to be displayed by switching among a plurality of lighting conditions on a screen. Therefore, in the illumination state switching display method for a building using a CG image according to claim 1, three-dimensional shape data regarding the building is created in advance by a CAD system, and the building is CG based on the three-dimensional shape data. When displaying as an image, three-dimensional shape data corresponding to a plurality of types of illumination is generated in advance by performing illumination calculation for displaying the building under a plurality of different types of illumination conditions. It is characterized in that an illumination state of the building is switched to a plurality of types based on the dimensional shape data and displayed.

That is, the shape and contour of the building are defined by the three-dimensional shape data of the building created by the CAD system, and in addition to this, the surface of the building under various lighting conditions is An illuminance distribution on each surface of the building is obtained by a method such as calculating an energy distribution, and based on the illuminance distribution, a shaded (colored) lighting-compatible three-dimensional shape representing the building under various lighting conditions. Data is generated, and based on this, the screen is displayed. Thereby, the customer can see how the building looks under various lighting conditions by the CG image displayed on the screen.
You can know almost exactly. Further, for example, under various lighting conditions, it is possible to evaluate on the screen whether or not the surface material of the building satisfies the taste of the customer.

According to a second aspect of the present invention, there is provided a lighting state switching display method of a building according to a CG image, wherein the plurality of types of lighting states are the first lighting state under daytime sunlight. And a second lighting state in which a lighting fixture attached to the building is turned on at night.

[0009] With this, it is possible to switch the illumination state of whether the building is displayed under the illumination of the sunlight in the daytime or under the illumination of the luminaire at night. As a result, under the two types of lighting conditions,
For example, it is possible to determine and evaluate on the screen whether or not the colors, patterns, etc. of various surface materials each satisfy the taste of the customer.

According to a third aspect of the present invention, there is provided a lighting state switching display method for a building according to the CG image, wherein the CG image representing the building under each of the lighting states is a still image or The feature is that it is displayed as a moving image. In this way, by displaying not only still images but also moving images as necessary, CG images under arbitrary lighting conditions such as daytime or nighttime, a more realistic and realistic depiction is provided. Is done.

According to a fourth aspect of the present invention, there is provided a method for switching and displaying a lighting state of a building using a CG image, characterized in that the building is a virtual building to be built. To do.

Thus, based on the three-dimensional shape data of the CAD system created for the unconstructed virtual building, the interior and exterior of the building are observed with the same feeling as if the building actually exists. Since it can be examined, if there is an inconvenient part in the building to be built, it is possible to realize a more ideal house by correcting it in advance.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, the configuration of the display room 1 (presentation room) for displaying CG images will be described. As shown in FIGS. 4 and 5, the display chamber 1 has, for example, two vertically elongated windows 3 with a light-shielding shutter 3a on a front wall 2 thereof, and the wall 2 near the front portion. Other than having a narrow gap 4 for ventilation between the ceiling and a ceiling (not shown), it has a structure in which external light does not easily enter,
As a whole, it is configured like a dark room. Display room 1 of 4
A bulging portion 5 that horizontally extends to the inside of the room is formed near the upper end of the other wall 2, and a small lighting fixture 6 is provided on the lower surface of the bulging portion 5 at predetermined intervals, while displaying A large lighting fixture (not shown) is attached to the ceiling (not shown) of the room 1.

A projection chamber 7 is provided behind the display chamber 1 with a wall 2 therebetween.
Are formed. As shown in FIG. 6, in the central portion of the wall 2 between the display chamber 1 and the projection chamber 7, a large screen 8 (number of pixels) having a size of 100 inches or more, specifically, for example, about 125 inches. Is about 1280 × 1024 dots). The screen 8 has, for example, a lens-shaped processing (Fresnel lens) that efficiently collects light on the projection chamber 7 side, and a vertical stripe (lenticular lens) that horizontally spreads the light on the display chamber 1 side. ) The Fresnel lenticular screen etc.

A mounting table 10 is arranged in the projection chamber 7, and a projector 11 (projector) having three projection tubes 11a is installed on the mounting table 10. A reflection mirror 12 is arranged between the projector 11 and the screen 8, and an image projected from the projector 11 is reflected by the reflection mirror 12.
After being reflected by, the image is projected onto the screen 8 from the rear, and the projected image on the screen 8 can be viewed from the front of the screen 8 in the display room 1. In addition, when the space of the projection room 7 can be sufficiently secured, the reflection mirror 12 is not used and the projector 11 to the screen 8 are used.
You may make it project directly on. In the figure, D is the display room 1
And the projection chamber 7 is a door that can be opened and closed.

In the display room 1, a viewer V who views the CG image on the screen 8 and a plurality of chairs 13 on which an operator or the like who operates a workstation 15, which will be described later, is seated, and the viewer V are A table 14 and the like used for placing various documents, catalogs, and taking notes are appropriately arranged, and a space in one corner of the display room 1 is
A workstation 15 is installed that generates CG image data for displaying a CG image of a building such as a house based on CAD data created in advance.

As shown in FIG. 7, the workstation 15 includes a CRT 17 (Cath 17) mounted on a table 16.
ode Ray Tube), a keyboard 18, a mouse 19, a printer 21, and an input / output / arithmetic unit 22 arranged below the table 16, and the like, and three-dimensional shape data on a building created by a CAD system in advance. CG image data is generated according to the input operation of the keyboard 18 and the mouse 19 by the operator O (or the viewer V himself), and based on this, the CG image regarding the building is displayed on the CRT 17 and the screen 8. Are displayed at the same time.

The input / output / arithmetic unit 22 has a bus and a graphics slot 22a including a system bus slot, a graphics slot, a VME bus slot, etc., and an SCS, as shown in a perspective view of FIG.
Drive slot 2 including I-II drive slot
2b, the power supply unit 22c, etc. are built in. The bus and graphics slot 22a further includes a CP
U, memory, etc. may be included.

As shown in the block diagram of FIG. 9, the input / output / arithmetic unit 22 is plural, for example, 2 to 2.
About 4 CPUs 23 (150MHz) and a capacity of 64
A main memory 24 of about MB to 16 GB, typically about 128 MB, and an I / O system group 25 are provided, and these are a synchronous system bus 26 (1.2 GB / s, 2 GB).
56 bit) and the input / output bus 27 (320 MB / s) are connected to each other so that data can be transmitted and received.

The I / O system group 25 includes a graphics interface 28, a predetermined number of HIO slots 30,
Ethernet31, VME64 bus 32 and SCS
The I-II interface 33 is provided. The graphics interface 28 includes an auxiliary image processing unit 34.
It is connected to the CRT 17 (screen size is, for example, 21 inches) via the (Reality Engine 2) and is also connected to the projector 11 (not shown). The auxiliary image processing unit 34 performs well-known anti-aliasing, texture mapping, and other processing on the image data from the graphics interface 28, and then outputs it to the CRT 17 or the like.

The HIO slot 30 is a slot (insertion port) for equipment expansion for connecting input / output devices such as graphics and SCSI-II. Various expansion boards are additionally mounted in the vacant HIO slot 30. Therefore, it is possible to improve the function. For example, by adding another auxiliary image processing unit 34 as graphics, two graphics processing systems can be provided, and high speed output to a plurality of screens such as the CRT 17 and the screen 8 can be realized. .

The Ethernet 31 is a LAN (Local A
(rea network), which is a connection port for connecting to another computer, for example, a CAD system by using this Ethernet 31, so as to directly connect with the CAD system without using a physical medium such as a floppy disk. It becomes possible to send and receive three-dimensional shape data and the like. The VME64 bus 32 is an extension standard of a kind of computer, and guarantees the connectivity of various extension devices by deciding the shape of the connection part, the arrangement of signal lines, and the like.

When creating and displaying a CG image of a house Z to be built in the display room 1 using the workstation 15, first, as shown in FIG. 10, a room separate from the display room 1 or a separate room. A plan view of the house Z is created by a house CAD system arranged in a building or the like (S1). FIG. 12 shows a plan view of the first floor portion of a two-story house as an example of the house Z, and FIG. 13 shows a plan view of the second floor portion. In each plan view, the plan shape and floor plan of the house Z are shown.

Subsequently, three-dimensional shape data (three-dimensional model) of the house Z is created by the house CAD system (S2 in FIG. 10). 14 to 16 are perspective views, north elevation views, and west elevation views of the house Z represented based on the three-dimensional shape data.

While the exterior CAD system creates three-dimensional shape data representing the exterior (not shown) such as the fence and gate attached to the house Z (S3 in FIG. 10), the general CAD system is used. , Three-dimensional shape data is created for an actual house adjacent to the planned house Z, a house in the road or a distant view, an existing neighborhood environment (not shown) such as a building (S4).

Further, in the general CAD system, outdoor and indoor scenic parts, for example, outdoor trees, vehicles such as automobiles,
Stones, bicycles, road signs (not shown), indoor furniture,
Three-dimensional shape data relating to furniture, ornaments, paintings, etc. is created in advance (S5), and these are stored in the library for scenic parts (S6). The above is the creation of the image data by the CAD system that should be performed prior to the display of the CG image. The house CAD system and the exterior CAD system are CAD systems equipped with various databases for creating three-dimensional shape data relating to the house Z and the exterior, respectively.

Based on the CAD data at the workstation 15, when the house Z, the exterior, the scenic parts and the surrounding environment of the house Z are created and displayed as a CG image, various types of the house Z, the exterior, etc. are displayed. The three-dimensional shape data created by the CAD system is read into the input / output / arithmetic unit 22 (S7 in FIG. 11). After that, the workstation 15 performs processing for data integration and image adjustment. The processing method includes (a) manual processing and
(B) There are two types of automation processing.

In the case of the manual work of (a), first, various shape data concerning the house Z, the exterior, the scenic parts, etc. are subjected to the subsequent CG image creation and display processing by using rendering software. At this time, it is converted into a readable file format (S8). Subsequently, with respect to the surface converted from the CAD data, each surface unit or a group unit of a plurality of adjacent surfaces is selected with a mouse or the like, and material information is set, whereby coloring is performed (S9).

In the present invention, it is mainly assumed that the shape conversion is performed by the automated processing of (b). In this case, in the CAD system, the three-dimensional shape data regarding the house Z is preliminarily specified in the building specification. Information is added. The building specification information includes the building type of the house Z (for example, type I, type II, etc.), the color of the exterior material (the material of the exterior material is determined by the type of the house Z), the type and color of the roof material. Important information for determining the appearance of the house Z is included.

In the automated process (b), the work station 15 performs shape conversion and coloring by a conversion program (S10). Here, the converted three-dimensional shape data is output not as a perspective view (three-dimensional perspective view) but as a file. That is, in the perspective diagram, a portion that cannot be seen from the viewpoint is not drawn. However, in the present invention, since the output is for a CG image, all of the created three-dimensional data is output as a file.

In the file output, the respective parts of the house Z, such as walls, floors, sashes, etc., are stored as data separately on the CAD. Here, when outputting the three-dimensional shape data of each part, the information indicating which part the shape data is, by the part name or number,
It is embedded in the shape data as internal information. An example is shown below. Part name (or number): Wall 3D shape data (wall) | End of 3D shape data Part name (or number): Sash 3D shape data (sash) | End of 3D shape data Part name (or number) : Floor 3D shape data (floor) │ End of 3D shape data

On the other hand, information such as what material is used for each part of the house Z, and therefore what color each part exhibits, is not included in the three-dimensional shape data, but is separately provided by the material information file. To be done. This material information file is prepared, for example, for each building type to which each house Z belongs, and the building specification information included in the three-dimensional shape data of the CAD system is read by the conversion program and based on this. Then, the material information file that matches the building format of the house Z is selected.

In each material information file, the name of each part such as the above-mentioned wall and sash, and the material that is normally used in each part (if the part is a roof material, for example, color vest, color is Brown) and attribute information on the CG software corresponding to the material (for example, reflection coefficient 0.4, texture mapping YANE, RGB 600 mm X 400).
mm equivalent, and stake-in from the bottom of the Z axis to the top) are stored as a correspondence table.

Further, a master file having all information, which is a master of these material information files, is provided as a backup file. Then, for example, when it is desired to change the material, color, or the like of a part of the house Z to something other than that stored in the material information file, desired information is called from the master file in the material information file. Can be replaced with a part of the information.

For example, as shown in part A in FIG. 17, the building type in the building specification information about the house Z is type I, the exterior material is type I (color is off gray), and the roof material is flat roof tile (color is black). , The material information file is
Based on the building type, the type I type shown in part B in FIG. 14 is selected. Here, type I (pale gray) is registered as a standard exterior material of the material information file for format I, which is different from the exterior material in the building specification information. In this case, the information C1 regarding the exterior material corresponding to the building specification information is called from the master file indicated by C in FIG. 17, and is stored in place of the information B1 regarding the exterior material in the material information file. The three-dimensional shape data file and the material information file will be described below.
Treated as a set.

After that, also with respect to each of the three-dimensional shape data relating to the exterior, the scenic parts, and the surrounding environment, the shape conversion and the coloring work are performed in the workstation 15 by the manual work (a) or the automatic process (b). After the
The files regarding the converted house Z, the exterior, the scenic parts, and the corresponding material information files are CG.
The files are read by software and the various files are integrated so that the house Z, the exterior, the scenic parts, etc. can all be displayed on the same screen in a combined state, and the entire configuration is created (in FIG. 8). S11). Subsequently, the integrated file is subjected to calculation for imparting a shade corresponding to the sun or shade to the image of the house Z or the like by the radiosity method, and various calculations such as lighting calculation and daily calculation. Is performed (S12).

In this case, according to the illumination calculation, for example,
CG image data for representing the house Z or the like under daytime sunlight, and CG image data for representing the house Z or the like in a state in which lighting equipment attached to the house Z is turned on at night For example, a plurality of types of CG image data corresponding to a plurality of different illumination states are prepared. Furthermore, for various surface materials such as outer walls and wallpapers, a plurality of types of surface materials having different colors, patterns, and uneven shapes are prepared, and a plurality of types of CG image data corresponding to each surface material are prepared. .

After completion of various calculations and adjustments in S12, C is set in the workstation 15 based on the file.
When the virtual viewpoint position set for the three-dimensional shape data is stopped or moved in a desired direction in response to an input operation with the mouse 19 or the like by using the G image display software, the viewpoint position is changed. The real-time calculation is performed in accordance with the movement of the image, and the CG image data obtained by the calculation is output to the screen 8 and the CRT 17, so that the house Z, from the desired position corresponding to the viewpoint position at each time point. A CG image that virtually reproduces the state of looking at the exterior, the scenery part, etc. is displayed as a moving image or a still image (S1).
3).

As a display form, as shown in FIG.
For example, another CG system, a large screen stereoscopic display system such as the screen 8 or the like, a head mounted display described later, the CRT 17 or the like can be output and directly displayed, or the CG image can be recorded on a video tape for home use. It is reproduced on a VCR so that it can be viewed on a home-use television, or based on the CG image, software for a television play machine such as a so-called family computer is created, and the television play machine and the home-use television are connected to each other. Various forms are conceivable, such as enabling display by using, or creating a three-dimensional photograph based on an arbitrary still image.

Hereinafter, as an example of the display mode, a case will be described in which the still image or the moving image created by the workstation 15 about the house Z, the exterior, the scenic parts, etc. is simultaneously displayed on the CRT 17 and the screen 8. . FIG.
A cursor G is displayed on the CRT 17, as shown in FIG.
By selectively operating one of the cursor keys 18a, the cursor 17a can be moved vertically and / or horizontally on the screen 17a of the CRT 17.

As for the virtual viewpoint position which becomes the reference of the rendering, when the cursor G is moved upward on the screen 17a, the viewpoint position becomes higher, and the cursor G becomes higher.
If you move down, the viewpoint position will decrease and
When the cursor G is moved rightward or leftward, the direction of the viewpoint (line of sight) is turned rightward or leftward accordingly. Furthermore, the left button 1 attached to the mouse 19
Pressing 9a advances the viewpoint position, pressing the middle button 19b stops the movement of the viewpoint position in the front-back direction, and pressing the right button 19c moves the viewpoint position backward.

FIG. 1 shows an example of the external appearance of the house Z displayed on the screen 8 as a CG image in the daytime. Here, a shade is given by the calculation based on the radiosity method or the like, and a shaded portion in the figure is a shaded portion. By moving the cursor G on the CRT 17 and operating the buttons 19a to 19c of the mouse 19, the direction of the viewpoint is changed or the viewpoint position is moved in the depth direction of the screen. A moving image that produces an audiovisual effect similar to walking around the outside and inside the house Z is generated as a CG image,
This video is displayed with shading.

FIG. 2 is a CG image showing the house Z in a state where the indoor lighting equipment is turned on at night based on the above-described lighting calculation. Here, the higher the density of the dots, the darker it is, and the E and F parts are the parts illuminated by the indoor lighting equipment. As the lighting state, in addition to the lighting state during the daytime and the nighttime, a plurality of kinds of states such as early morning or dusk can be prepared in advance by the lighting calculation, and the switching of the lighting state can be performed by any key operation of the keyboard 18. Etc. The walk-through performed by operating the cursor keys 18a and the buttons 19a to 19c on the mouse 19 can be performed under an arbitrary illumination state.

As the outer wall W of the house Z, if different shapes, patterns, and textures are prepared as the outer wall W and the viewer V is allowed to select the desired outer wall W, as shown in FIG. The selection of W can be done on the screen 8. That is, when the operator O performs a predetermined operation with the keyboard 18 or the like, a plurality of types, for example, nine types of outer walls W are provided at one corner of the screen 8 and the CRT 17, for example, a lower left corner.
A display sample S showing each of the microscopic areas of is displayed in an enlarged state.

The viewer V looks at the display sample S,
When the desired outer wall W is selected, the operator O accordingly performs a predetermined operation on the keyboard 18 or the screen 17a of the CRT 17 to display the selected outer wall W on the screen 8 and the screen 17a of the CRT 17. To be done. When it is decided to select the outer wall W, the operator O performs a predetermined operation to erase the display sample S, and thereafter, the walkthrough is performed using the selected outer wall W.

When the viewpoint position is moved indoors by operating the cursor keys 18a and the buttons 19a to 19c of the mouse 19, for example, as shown in FIG. 19, the workstation 15 based on the three-dimensional shape data is displayed. Is performed on the screens 8 and C based on the CG image data generated by the calculation.
Displayed on RT17. FIG. 19 shows a state before the addition of the shadow, and FIG. 20 shows a CG image after the addition of the shadow by the radiosity method or the like. In FIG. 20, a portion with a narrower hatching interval is darker.

By sequentially moving or stopping the viewpoint position indoors, the Western room J shown in FIG. 21, the kitchen K shown in FIG. 22, the bathroom Y shown in FIG.
It is displayed as a moving image or a still image. The correspondence between the operation of moving the virtual viewpoint position with the keyboard 18 and the mouse 19 and the switching of the display of the CG image will be described with reference to the plan view of FIG. For example, assuming that the viewpoint position is P point, that is, the dining room M and the viewpoint is facing the arrow Q direction, the partition K1 of the kitchen K is displayed on the screen (not shown). There is. Here, when approaching in the direction of the kitchen K, the forward left button 19a on the mouse 19 may be pressed. On the other hand, if the direction of the viewpoint is changed to the direction of the living room N, the cursor G may be moved to the left with the cursor key 18a. An arbitrary still image generated during the walkthrough can be color printed by the printer 21 or the like, and the walkthrough can be continuously performed during this printing.

For each surface material such as floor, inner wall, wallpaper, ceiling, etc. of each indoor room, CG image data corresponding to a plurality of different patterns, textures, etc. are prepared in advance,
In the same manner as the outer wall W, the screen 8 and CR
The viewer V can be made to select a desired surface material on T17 and the selected surface material can be displayed.

The CG image on the screen 8 may be viewed as a two-dimensional image. However, if the CG image is viewed as a three-dimensional stereoscopic image, it is easy to understand the sense of space. Therefore, it is possible to obtain an image that more closely approximates the state of walking around the inside and outside of the actual house Z for observation.
As a method of obtaining a stereoscopic image, as shown in FIG. 4, for example, the viewer V can open and close the right-eye shutter 36.
There is a method of wearing liquid crystal shutter glasses 36 including a and a left-eye shutter 36b. The principle of obtaining a stereoscopic image using the liquid crystal shutter glasses 36 is well known, but will be briefly described below.

As shown in FIG. 24, the display device such as the screen 8 is alternately supplied with the video signal R for the right eye and the video signal L for the left eye, while the shutter 36a for the right eye of the liquid crystal shutter glasses 36 is opened. Right eye shutter open signal R
O and a left-eye shutter open signal LO that opens the left-eye shutter 36b are alternately supplied to the right-eye shutter 36a and the left-eye shutter 36b. Then, the viewer V wearing the liquid crystal shutter glasses 36 visually recognizes the right-eye video signal R and the left-eye video signal L alternately for the right eye and the left eye, whereby the CG image is recognized as a stereoscopic image.

Instead of the liquid crystal shutter glasses 36
For example, using the polarizing glasses 37 shown in FIG.
You can also get a body image. Here, such as screen 8
A polarizing plate 38 is provided in front of the display device.
8. Polarizing plate control signal θ_R, Θ _LAnd are supplied alternately
By changing the polarization direction alternately by 90 °
The right-eye image RI and the left-eye image LI are alternately polarized plates.
38, and further, the right-eye image RI is polarized glasses 37.
Of the right-eye polarization plate 37a, the left-eye image LI is the left-eye polarization
The CG image is displayed by passing through each of the plates 37b.
It is recognized as a body image. In addition, the polarized glasses 37 are used.
In this case, two projectors 11 are used and one projector is used.
The right eye video signal from the other projector 11
To project the left-eye video signal continuously and polarize them.
Separated by the plate 38 and the polarized glasses 37, the right eye and the left eye respectively
It is also possible to obtain a stereoscopic image by visually confirming with.

Further, in order to obtain a stereoscopic image, for example, as shown in FIG.
6, HMD (head mount display) 40 shown in FIG. 27 can also be used. This HMD40 is
An image display unit 41 located in front of both eyes of the viewer V, and two headphones 42 applied to both ears of the viewer V,
A main body 45 having a frame 43 that connects the image display unit 41 and the headphones 42 and the like, and a detection sensor 44 that is attached to the upper portion of the frame 43 and detects the movement of the head of the viewer V, a joystick 46, and operation buttons 47 ( A control box 48 having operation tools such as FIG. 1),
A cable 49 is also provided for transmitting signals from the control box 48 to the image display unit 41 of the main body 45, the headphones 42, etc., and outputting the detection signals of the detection sensor 44 and the like to the control box 48. Although not shown, the control box 48 is connected to the workstation 15 if necessary.

As shown in FIG. 28, the image display unit 41 includes an optical system 51 including a lens and the like, and a display unit 52 including a liquid crystal display and the like, and has a parallax between the right eye and the left eye of the viewer V. By displaying the CG image, a virtual image is created at a position T (a position separated from the eye by its focal length U) in the figure. As a result, the viewer V is provided with a visual effect as if the object were present at the position X in the drawing.

When the viewer V wears the HMD 40 and turns his / her head to the right or left, the detection sensor 44 detects it and creates the virtual image for creating and displaying a CG image. While the direction of the viewpoint turns right or left, the viewpoint position can be moved forward or backward by the joystick 46 or the like. Then, in accordance with the change of the direction of the viewpoint and the movement of the position of the viewpoint, the workstation 15 performs the calculation in real time, and
A walkthrough is performed in the HMD 40 by generating the image data.

In the above description, C for the house Z
G image on screen 8 and CRT17 or HMD40
Although the display medium is used for display, various other display media such as the video deck and the television game machine shown in FIG. 11 can be used. Further, in the workstation 15, as the operating means for moving the viewpoint position, various devices such as a joystick can be used in addition to the mouse 19. Further, in the above-described embodiment, the projection chamber 7 is separately provided behind the display chamber 1 so that the projection is performed from the back side of the screen 8.
Alternatively, the projector 11 may be arranged in the display room 1 without providing the above to project from the front. In that case, a screen suitable for projection from the front such as a silver screen can be used as the screen 8. Further, instead of the screen 8 and the projector 11, a large-screen high-definition television or the like may be used to perform the display.

[0056]

As described above, in the lighting state switching display method for a building using a CG image according to the present invention, three-dimensional shape data regarding the building is created in advance by a CAD system, and the building is constructed in the above-mentioned 3 C based on dimensional shape data
In displaying as a G image, three-dimensional shape data corresponding to a plurality of types of illumination is generated by performing illumination calculation for displaying the building under a plurality of types of different illumination states, and these types of illumination are supported. Since the building is displayed by switching the lighting state to a plurality of types based on the three-dimensional shape data, the customer can determine how the building looks under various lighting states. It can be known from the CG image displayed on the screen. As a result, for example, under various lighting conditions, it is possible to evaluate on the screen whether or not the surface material of the building satisfies the taste of the customer.

In the illumination state switching display method, the plurality of types of illumination states include a first illumination state under daytime sunlight and a second illumination state in which a lighting fixture attached to the building is turned on at night. If the lighting condition is included, the lighting condition should be switched between displaying the building under daytime sunlight and lighting under night lighting. As a result, under the two types of lighting conditions, for example, it is possible to judge and evaluate on the screen whether or not the colors, patterns, etc. of various surface materials each satisfy the taste of the customer. There is an advantage that

In the illumination state switching display method, if the CG image representing the building under each of the illumination states is displayed as a still image or a moving image, it can be displayed in any illumination state such as daytime or nighttime. The CG image below can be displayed not only as a still image but also as a moving image as needed, so that a more realistic and realistic depiction is performed.

Since the lighting state switching display method is characterized in that the building is a virtual building to be built, C created for an unbuilt virtual building is used.
Based on the three-dimensional shape data of the AD system, the inside and outside of the building can be observed and examined with the same feeling as if the building actually exists. As a result of this examination, the building to be constructed If there is an inconvenient part of the object, it is possible to realize a more ideal house by correcting it in advance.

[Brief description of the drawings]

FIG. 1 is a front view showing a screen in which a house is shaded and displayed as a CG image by the method of the present invention.

FIG. 2 is a partial front view of a screen displaying a CG image showing a lighting state of the house at night.

FIG. 3 is a front view showing a state in which an outer wall of the house is selected from a plurality of types on a screen.

FIG. 4 is a schematic horizontal sectional view showing the display chamber and the projection chamber.

FIG. 5 is a perspective view showing a state in which the display chamber is viewed from the rear.

FIG. 6 is a perspective view showing a state in which a display chamber for displaying a CG image by the method of the present invention is seen from the front.

FIG. 7 is a perspective view showing a corner where a workstation in the display chamber is installed.

FIG. 8 is a perspective view showing the input / output and arithmetic unit of the workstation in a see-through state.

FIG. 9 is a block diagram showing the input / output and arithmetic unit.

FIG. 10 is a flowchart showing a procedure for creating three-dimensional shape data regarding a house by a CAD system prior to creating and displaying a CG image according to the present invention.

FIG. 11 is a flowchart showing a procedure for converting the three-dimensional shape data into a state that can be read by rendering software.

FIG. 12 is a plan view showing a first floor portion of a two-story house created by the CAD system.

FIG. 13 is a plan view showing a second floor portion of a two-story house created by the CAD system.

FIG. 14 is a perspective view of a two-story house created by the CAD system.

FIG. 15 is a north elevation view of a two-story house created by the CAD system.

FIG. 16 is a west elevation view of a two-story house created by the CAD system.

FIG. 17 is an explanatory diagram showing a procedure for creating a material information file used when performing shape conversion by automatic processing.

FIG. 18 is a front view showing a main part of the workstation.

FIG. 19 is a front view showing a screen in which the inside of the house is displayed as a CG image.

FIG. 20 is a front view showing a state in which a CG image showing the inside of the house is shaded.

FIG. 21 is a partial front view showing a screen displaying a Western room in the house as a CG image.

FIG. 22 is a partial front view showing a screen in which the kitchen in the house is displayed as a CG image.

FIG. 23 is a partial front view showing a screen displaying the bathroom in the house as a CG image.

FIG. 24 is an explanatory diagram showing the principle of obtaining a stereoscopic image using liquid crystal shutter glasses.

FIG. 25 is an explanatory diagram showing the principle of obtaining a stereoscopic image using polarizing glasses.

FIG. 26 is a side view showing a head mounted display usable according to the present invention.

FIG. 27 is a rear view showing the head mounted display.

FIG. 28 is an explanatory diagram showing the principle of obtaining a stereoscopic image by the head mounted display.

[Explanation of symbols]

 Z ... Housing (building)

Claims (4)

[Claims] 1. Three-dimensional shape data relating to a building is created in advance by a CAD system, and when the building is displayed as a CG image based on the three-dimensional shape data, the building is classified into a plurality of different types. A plurality of types of lighting-corresponding three-dimensional shape data is generated by performing lighting calculation for displaying under a lighting state, and the building is switched to a plurality of lighting states based on these lighting-corresponding three-dimensional shape data. CG characterized by being displayed as
A method for displaying and switching the lighting condition of a building using images. 2. The plurality of types of lighting states include a first lighting state under daytime sunlight and a second lighting state in which a lighting fixture attached to the building is turned on at night. The lighting state switching display method of a building by the CG image according to claim 1. 3. A CG representing the building under each lighting condition.
The lighting state switching display method of a building by a CG image according to claim 1 or 2, wherein the image is displayed as a still image or a moving image. 4. The lighting state switching display method for a building using a CG image according to claim 1, wherein the building is a virtual building to be built.