JP5085399B2 - 3D model generation system - Google Patents

Description

  The present invention, when generating a 3D model from a plan view of a building such as a house, makes it easier to generate a 3D model and generates a 3D model that can be rendered at high speed without impairing intuition. About.

  A building such as a house is usually designed using a plan view or a three-sided view. However, as computer technology advances in recent years, a 3D model is used for design, strength calculation, and display. Has been done. In addition, the 3D model can mechanically generate a realistic 3D image by rendering, and the plan can be grasped visually and intuitively. This is also effective when a designer in charge examines a plan from the design stage. Rendering refers to imaging data by calculating the reflectance of the surface (surface), mapped texture, light source, and the like.

  Furthermore, the 3D model is not limited to a planar 3D image (perspective view or perspective view), but is dynamically (in real-time) rendered as data having a three-dimensional structure, thereby obtaining a VR image (virtual reality image). ) Has been done. Thereby, the experience person can realize what is called walk-through as if walking around the room.

  When a VR image is generated, radiosity calculation is often performed as rendering. Radiosity calculation visualizes the surface of an object by dividing the surface of the object into a number of faces and calculating the shade and color of each face. In the radiosity calculation, if the relationship between the object and the light does not change, the calculation result is constant, so it can be calculated in advance during the walk-through. However, if the object or light source changes, the radiosity needs to be recalculated. For example, if the sofa is removed after the radiosity calculation, only the shade of the sofa is left on the floor.

  Conventionally, various proposals have been made for presentation of a housing plan using 3D. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2001-283256), 2D video data of a person to appear in a virtual model house is acquired, and the 2D video data of the person is pasted into the virtual model house in the manner of texture mapping. A configuration is disclosed in which a VR image is three-dimensionally displayed by rotating the vertical axis so that the gaze direction of the experience person is orthogonal to the screen. According to Patent Document 1, this makes it possible to obtain a higher sense of reality.

  Patent Document 2 (Japanese Patent Laid-Open No. 2006-040053) acquires real images of an indoor space captured by a plurality of imaging devices, and acquires a virtual image obtained by viewing a virtual model of the same indoor space from a virtual viewpoint. , A surface area of the virtual model for mapping the texture in the real video is specified, and a partial area in the real video after shape conversion is mapped to the surface area. According to Patent Document 2, it is possible to easily construct a highly realistic indoor space model in a virtual space, and present a VR video with a more realistic feeling to those who want to purchase a house. You can do that.

JP 2001-283256 A JP 2006-040053 A

  The above-described conventional 3D model and rendering have also been developed, and have been aimed at generating more realistic and detailed images. Also, when generating a 3D image of a building, in order to increase the sense of reality and to visually recognize the size of the room (the spread of the space), it is possible to add furniture, plants, figurines and other incidental items as close as possible to the actual item ( Many things that do not require construction work are placed. For this reason, the operator has to select and arrange the incidental objects, and it takes time to create the 3D model. In addition, the main body of the building is generally a planar and linear structure, but in comparison there are many cases where the accessory has a complicated shape or curved surface, and the incidental rather than the main body of the building. The calculation load tends to increase.

  However, if an attempt is made to generate a detailed image of the accessory, the amount of calculation becomes enormous and the calculation time also increases. Conventionally, the processing power of a computer's CPU is overwhelmingly short with respect to the amount of calculation, relying on graphic chip processing using OpenGL, etc., performing distributed rendering by connecting multiple PCs, texture mapping, etc. Various speedups have been attempted, such as omitting surface calculation. Although the processing capability has been improved by the development of computers, the image quality required is improved accordingly, and the current situation where the computer processing capability is still insufficient for the required image quality remains unchanged.

  In particular, when creating a house plan, as described above, there is a demand to study using a rendering image. At this time, it is necessary to generate and render a 3D model based on the plan view for design. How much time is required for rendering depends on the performance of the computer, but it takes about 40 minutes to 1 hour with a general-purpose computer. However, since the operator makes trial and error in order to pursue the customer's request and his / her own ideal, it is necessary to regenerate the 3D model and re-render the rendering after modifying the floor plan several times. Then, half a day or one day passes immediately to consider one property. Here, if rendering is fast, trial and error are likely to occur, and a large number of floor plans can be studied in a short time. Therefore, it is desirable to increase the rendering speed as much as possible.

  Further, if a plan view can be used to generate a 3D image and a VR image in a short time, the 3D image can be made in time from the initial stage when a plan is proposed to the customer. If there is a correction, it can be immediately reflected in the 3D image. Then, the customer can examine the plan intuitively from an early stage, and can obtain more information. As a result, it is considered that the progress of the design can proceed smoothly, and as a result, a highly satisfactory building can be provided.

  Heretofore, a 3D model of a building such as a house has been automatically generated to some extent from a plan view. This is possible because buildings are generally rectangular structures and solid objects such as stairs and windows are standardized to some extent. Further, when a 2D symbol of an accessory is arranged in the plan view, a 3D symbol of a corresponding accessory is arranged in the 3D model. With these automations, generating a 3D model from a plan view has dramatically reduced labor. Here, the symbol is a symbol that is saved as an independent graphic file (symbol file), read out appropriately, and used repeatedly.

  However, even if the 3D symbol is automatically arranged based on the 2D symbol and the generation and arrangement of the 3D model is labor-saving, there is no substitute for the high rendering load of the incidental object. Although the light source is not necessarily described in the plan view, the light source is always necessary when rendering is performed with the 3D model. Even if the light source is automatically arranged, the light source arranged at an inappropriate position must be corrected manually, and the position correction must be performed again every time trial and error is performed. For this reason, there exists a problem that correction and adjustment of 3D model take time.

  Therefore, according to the present invention, when generating a 3D model from a plan view of a building such as a house, 3D model generation that makes it easy to generate a 3D model and generates a 3D model that can be rendered at high speed without impairing intuition. The purpose is to provide a system.

  The inventors have examined that incidental items placed in the room are necessary for improving the sense of reality and grasping the size of the room, but when considering a housing plan, the detailed incidental items are rather experienced. I thought that there was a risk of fixing my idea and making my imagination lack. That is, furniture is necessary to know the size of the room, but it is sufficient if the size is known, and if it is too specific, human thinking stops, so rather rough is preferable because it does not lose imagination . However, if a rough object exists in the room, it may become unsightly. Therefore, in order to reduce the calculation load while reducing the presence of the accessory without impairing the aesthetic appearance, the present inventors have completed further studies and completed the present invention.

That is, a typical configuration of the 3D model generation system according to the present invention includes a 2D data acquisition unit that acquires 2D data including a plan view of a building and 2D symbols of incidental objects arranged in the plan view of the building, A three-dimensional building part that generates a 3D model of the building from the plan view of the building, a storage part that stores the 3D symbol of the accessory associated with the 2D symbol of the accessory in advance, and a plan view of the building Based on the 2D symbol of the accessory , the storage unit is referred to, and a 3D symbol placement unit that places a 3D symbol corresponding to the 2D symbol in the 3D model of the building, and generation when generating the 3D model of the accessory and a generation pattern specifying unit that specifies a pattern, 3D symbol is a polygon having a large number of detailed 3D symbols and one or more two-dimensional or three-dimensional basic figures It combines the primitives, and is composed of a simple 3D symbols set the transmittance to be translucent to the surface, in the storage unit, the 2D symbol and generating patterns of associated object, a polygon having a large number of details 3D symbols, simple 3D symbols composed of a combination of primitives that are one or more two-dimensional or three-dimensional basic figures, and configured to set translucency that is semi-transparent on the surface, or no 3D symbols A table that is uniquely determined is stored, and the 3D symbol placement unit is placed in the plan view of the building with reference to the table stored in the storage unit according to the generation pattern specified by the generation pattern specification unit For specific accessories, place detailed 3D symbols in the 3D model of the building, and place simple 3D symbols in the 3D model of the building. Not place location or 3D symbols, and generates a 3D model of the building.

  According to the above configuration, the 3D symbol of an accessory such as furniture, plant, or figurine is configured with a simple figure combining one or more primitives, and the translucency is adjusted and displayed in a translucent manner. Rendering is possible at high speed without losing intuition. The primitive means a basic figure, such as a rectangle, a triangle, and a circle in two dimensions, and a cuboid, a sphere, a triangle, a cone, and a cylinder in three dimensions. As a result, the approximate position and size of the accessory can be grasped, so that the size of the room can be grasped. An image can be obtained. In addition, as a method for making the 3D model of the accessory semi-transparent, in addition to setting the transparency on the surface (surface attribute) of the 3D symbol, a transparent texture may be pasted, or other methods may be used. There is no difference in the invention.

In addition , a plurality of 3D symbols having different generation patterns can be easily and collectively used for one 2D symbol according to the purpose. Therefore, for example, during trial and error, an image can be generated using simple 3D symbols with a light calculation load, and fine 3D symbols can be used when the plan is fixed.

  According to the 3D model generation system according to the present invention, when generating a 3D model from a plan view of a building such as a house, the 3D model can be generated more easily and can be rendered at high speed without impairing intuition. A model can be generated.

[First Embodiment]
A first embodiment of a 3D model generation system according to the present invention will be described. Note that dimensions, materials, and other specific numerical values shown in the following examples are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified.

  First, the overall configuration of a CAD system including a 3D model generation system according to the present invention will be described, and then the 3D model generation system will be described in detail.

(CAD system (overall configuration))
FIG. 1 is a diagram for explaining the overall configuration of a CAD system. The CAD system 10 shown in the figure includes a 2D CAD unit 12, a 3D model generation system 100, a modeling unit 14, a rendering unit 16, a 3D image output unit 18, a VR image generation unit 20, and a VR data output unit 22. Each of these units and the 3D model generation system 100 may be a single application as a whole, or may be a system in which a plurality of independent applications are combined. Therefore, you may run the application of each part with a different computer. Also, data exchange may be delivered internally or may be delivered via a recording medium or a communication line.

  The 2D CAD unit 12 is a program in which an operator creates design drawings such as a plan view and an elevation view of a building. The plan view includes an outline view of a building such as a house, a parts view, a parts list, and a peripheral view including neighboring buildings. In addition, the plan view includes 2D symbols representing incidental objects such as furniture, plants, and figurines (those that do not affect building work). A symbol is a graphic that is saved as an independent graphic file (symbol file), read out appropriately, and used repeatedly. As a specific example, the 2D symbol is constituted by the name of the accessory and a planar shape.

  From the 2D CAD unit 12 to the 3D model generation system 100, 2D data including a plan view of the building and a 2D symbol of the accessory is delivered. A general CAD program can be used as the 2D CAD unit 12, and general-purpose data can be used as the 2D data on the condition that 2D symbols can be identified. Also, 2D data is suitable for construction work, even if it is related to construction work, by making it possible to identify a specific unit such as a kitchen so that three-dimensionalization and texture mapping can be performed appropriately. is there.

  The 3D model generation system 100 automatically generates 3D data (3D model and 3D symbol) using a predetermined initial value based on the 2D data received from the 2D CAD unit 12. The 3D model generation system 100 will be described in detail later.

  The modeling unit 14 is a program that adjusts (creates and corrects) 3D data delivered from the 3D model generation system 100 by an operator. The modeling unit 14 can create and modify a 3D shape (object) of a house including a building, and add and modify an attribute of a surface (surface) of the object. As the modeling unit 14, a general 3D CAD program (in particular, a module called a modeler) can be used. From the modeling unit 14 to the rendering unit 16, 3D data including a 3D model and a 3D symbol is delivered.

  The rendering unit 16 performs visualization such as radiosity calculation, ray tracing, and scan line based on the 3D data. As the rendering unit 16, a general 3D CAD program (in particular, a module called a renderer) can be used.

  The 3D image (perspective view or perspective view) visualized by the rendering unit 16 can be output from the image output unit 18 such as a monitor or a printer. Further, 3D data subjected to radiosity calculation is delivered from the rendering unit 16 to the VR image generation unit 20.

  The VR image generation unit 20 generates a virtual reality image. The VR image here is not an image of a 3D model into a planar 3D image (perspective view or perspective view), but an image that is dynamically (in real time) drawn as data having a three-dimensional structure. . By dynamically drawing while changing the viewpoint, the experience person can realize a so-called walk-through as if walking around the room. The VR image data is transferred from the VR image generation unit 20 to the VR data output unit 22.

  The VR data output unit 22 is a recording medium such as a CD or an HDD, a server that can distribute data via the Internet or a network, and the like. An experienced person such as a customer can experience a virtual reality image by using a program that reproduces VR image data in a predetermined format.

(3D model generation system)
Next, the 3D model generation system 100 will be described. FIG. 2 is a diagram illustrating the configuration of the model generation system, and FIG. 3 is a diagram illustrating an example of data.

  As illustrated in FIG. 2, the 3D model generation system 100 includes a 2D data acquisition unit 102, a building stereoscopic unit 104, a storage unit 106, a 3D symbol arrangement unit 108, a light source arrangement unit 110, and a 3D data output unit. 112.

  The 2D data acquisition unit 102 acquires 2D data from the 2D CAD unit 12. The 2D data includes a plan view 122 of the building and an accompanying 2D symbol 126 as shown in FIG. In FIG. 3A, as an example of the 2D symbol 126, a 2D symbol 126a of a sofa, a 2D symbol 126b of a table, and the like are arranged. On the other hand, since the kitchen 124a and the cupboard 124b are constructed by construction work, it is recognized that they are not incidental, but the manner of setting the incidental is not limited thereto. For example, the cupboard 124b or the like may be considered as furniture and may be an accessory. In the plan view 122, a room name 128 is described for each room. 3A visualizes and represents the plan view 122 and the 2D symbol 126, the 2D data itself is a set of numerical data and character string data.

  The three-dimensional building unit 104 generates a 3D model of the building from the floor plan 122 of the building based on the 2D data acquired by the 2D data acquisition unit 102. FIG. 3B shows an example in which a 3D model 132 of a building body is generated. Since buildings such as houses are generally rectangular, the 3D model 132 can be automatically generated by using constant initial values for the height of the ceiling (for example, 240 cm) and the height of the handrail (for example, 65 cm). it can.

  In addition, the building three-dimensional unit 104 reduces the calculation load by expressing a complicated shape on a substantially flat surface by texture mapping. For example, door surface patterns, kitchen stove control surfaces and virtues, flooring and frames on walls.

  The storage unit 106 stores an accessory 2D symbol 126 and an associated 3D symbol 136 associated therewith in advance. For example, a sofa 3D symbol 136a is stored in association with the sofa 2D symbol 126a, and a table 3D symbol 136b is stored in association with the table 2D symbol 126b. As a specific example, the 3D symbol includes the name of the accessory, the 3D shape, the color and transparency of the surface (surface) of the polygon, the texture, and the like.

  The 3D symbol arrangement unit 108 calls the corresponding 3D symbol 136 with reference to the storage unit 106 based on the 2D symbol 126 arranged in the floor plan 122 of the building. Then, as illustrated in FIG. 3C, the 3D symbol 136 corresponding to the position corresponding to the 2D symbol 126 is arranged in the 3D model 132 of the building. When the 2D symbol 126 overlaps, for example, when there is a vase on the desk, the upper object is placed on the upper surface of the underlying object. Thereby, the 3D symbol 136 is arranged in the 3D model 132 almost automatically.

  The 3D data output unit 112 outputs 3D data including a 3D model and an accompanying 3D symbol to the modeling unit 14. FIGS. 3B and 3C visualize the 3D model 132, but the 3D data itself is a collection of numerical data and character string data.

  Here, the 3D symbol stored in the storage unit 106 is configured by combining one or more primitives. 4A and 4B are diagrams illustrating 3D symbols. FIG. 4A illustrates an example of a translucent 3D symbol in which primitives are combined, and FIG. 4B illustrates an example of a fine 3D symbol. is there.

  A primitive means a basic figure, such as a rectangular parallelepiped, a sphere, a triangular prism, a cone, or a cylinder. Since the number of polygons can be reduced by using planes as much as possible, approximation is performed with a rectangular parallelepiped or polygonal shape, and the number of divisions is reduced for spheres and cylinders. For example, in the case of a sofa, as shown in FIG. 4A, the seating surface, the backrest, and the armrest can be approximated by a rectangular parallelepiped (primitive) and combined to form a very simple shape. Thereby, the number of polygons can be drastically reduced with respect to a fine figure using many curved surfaces as shown in FIG. Further, for example, in the case of a table, the top plate and the legs can be approximated by rectangular parallelepipeds (primitives) and combined to form a very simple shape. In other words, the shape of the accessory is configured without using a complicated shape or curved surface.

  However, if there is an object with a simple shape in the room, there is a risk that the person who sees the image will feel uncomfortable. Therefore, in the 3D symbol 136, a translucency that is translucent is set on the surface. As a result, the size of the room can be recognized visually and intuitively, the presence of incidental objects in the image can be reduced, and the uncomfortable feeling can be reduced.

  FIG. 5A is an example of a 3D image using an accessory made of primitives, and FIG. 5B is an example of a fine 3D image using an accessory having a complicated curved surface. Although a fine image is certainly obtained in FIG. 5B, the presence of the accessory is large, and there is a possibility of giving a fixed idea to the viewer. On the other hand, in FIG. 5 (a), the approximate position and size of the accessory can be grasped intuitively, so that the experience person is given a fixed idea even though the size of the room can be grasped. Therefore, a sufficient 3D image can be obtained if necessary.

  Furthermore, when the inventors actually performed the calculation, it took about 40 minutes to 1 hour for a general popular computer to calculate the image in FIG. In order to obtain the image of FIG. 5A, the work time was about 8 minutes. This is because primitives can dramatically reduce the number of polygons for ancillary accessories such as sofas and planted trees, so that rendering can be performed at high speed.

  In other words, the 3D symbol 136 of an accessory such as furniture, plant, or figurine is composed of a simple figure combining one or more primitives, and the translucency is adjusted and displayed in a semi-transparent manner, thereby improving intuition. It became possible to render at high speed without loss.

  Although not shown, the 3D symbol arrangement unit 108 arranges 3D symbols for neighboring houses. That is, a neighboring house does not generate a 3D model from a plan view, but is a 3D symbol stored in the storage unit 106, which is a combination of one or more primitives, and has a transparency that is translucent on the surface. 3D symbols configured and configured are arranged. If the neighboring houses are displayed in detail, the number of polygons to be rendered increases dramatically and the calculation time increases. On the other hand, if there is a lump of objects having a simple shape outside the window of the target property or adjacent to the external view of the target property, the person who viewed the image may feel uncomfortable. Therefore, in the 3D symbol representing a neighboring house, the translucency that is translucent is set on the surface as in the 3D symbol 136 of the accessory. As a result, the presence of the accessory in the image can be reduced, and the uncomfortable feeling can be reduced.

  The light source placement unit 110 places a light source in each room in the 3D model 132 generated by the building three-dimensionalization unit 104 even when there is no 2D symbol of illumination in the 2D data. 6A and 6B are diagrams for explaining automatic arrangement of light sources, in which FIG. 6A is a plan view of a 3D model, and FIG. 6B is a side view of the 3D model.

  When rendering a 3D model, if there is no light source in the room, the room will be dark, so it is necessary to place the light source in all rooms. Also, in order not to create a place that is too bright or too dark in the room, the operator has required a considerable amount of time to set the position and intensity of the light source. Further, when the 3D model is regenerated by correcting the plan view, the settings of the light source that have been made are lost, so it has to be reset every time.

  Therefore, the light source placement unit 110 places light sources in all indoor spaces. Here, when there is a 2D symbol of a lighting fixture in 2D data, a light source can be arranged based on this. That is, the light source is automatically generated when the position of the lighting device has not been determined (a stage of giving a presentation to a customer who purchases the building before the floor plan is determined). Therefore, the light source 138 to be automatically arranged is only required to be in a certainly certain position, and is not necessarily in the best position as a plan (if the plan creation is advanced, the floor plan is fixed, and the arrangement of the lighting devices in the plan view 122 is arranged. Since the plan is also decided, we will create a perspective diagram based on this).

  As shown in FIG. 6, the light source arrangement unit 110 arranges the light source 138 at a predetermined distance from the center in the plane direction of the room in a substantially rectangular room such as the living room cafeteria 122 a and the western room 122 b. The center in the plane direction can be, for example, the centroid of each room (a region surrounded by an outer wall, a partition wall, etc.) in a plane figure. The predetermined distance from the ceiling can be set as appropriate. For example, the predetermined distance can be about 50 cm from the ceiling or half the height of the room. When the position of the light source 138 is set to the center in the plane direction of the room and half the height of the room, that is, it can be set to the midpoint of the space area of the room on the three-dimensional coordinates.

  Further, in a bent indoor space such as the hallway 122c, the centroid may be out of the indoor space. The centroid of the corridor 122c referred to here is a position that is an intersection of a virtual rectangle formed by the outermost peripheral line of the area of the corridor 122c and connecting diagonal lines of the virtual rectangle. In such a case, the position of the light source 138 in the plane direction can be matched with the screen display position of the room name 128 in the plan view 122 of the building (see FIG. 3A).

  That is, in the plan view 122 of the building, the characters of the room name are always arranged at any position in the room area in each room, displayed on the screen by the display means of the computer (CAD), and from the printer by the printing means. Although it is printed on paper, the display position is moved by an input means such as a mouse even when the centroid is not in the room (the area of the actual corridor 122c), particularly in a curved corridor 122c. Thus, the room name 128 can be arranged in the room (in the room area). Therefore, by arranging the light source 138 at the position of the room name 128, the light source 138 can be surely arranged in the region of the room.

  Note that the light source arrangement unit 110 determines whether or not the center of the room in the plane direction is out of the room area.

  In the above example, as a more preferable example, the light source 138 is arranged according to the centroid when the room area is a simple rectangle, and according to the screen display position of the room name when the room area is not a simple rectangle. However, the present embodiment is not limited to this. For example, regardless of whether the room is rectangular or not, all the light sources 138 are automatically arranged in the room according to the display position of the room name. It may be. Furthermore, instead of arranging the light source 138 at the display position of the room name 128, the light source 138 may be arranged at the intersection of the grids of the screen in the room area closest to the centroid (the grid is a computer (CAD)). It is displayed on the screen and is the intersection of module lines set in the vertical and horizontal directions (X direction and Y direction) on the plan view in the smallest unit of design module dimensions. The outer wall and partition wall of the building to be made are input and arranged based on the grid intersection.)

  By these things, a light source can be reliably arrange | positioned in each room, and the effort which an operator arrange | positions a light source can be reduced significantly. Therefore, it is possible to increase the speed of work when generating the 3D model from the plan view.

  The light source placement unit 110 sets the intensity of the light source 138 based on the volume of the room or the room name when the light source 138 is placed in each room in the 3D model 132 generated by the building three-dimensionalization unit 104. If the light source 138 having the same brightness is disposed in all the rooms when the light source 138 is disposed, the brightness may vary depending on the size of the room. Therefore, by setting the intensity of the light source based on the volume (size) of the room, each room can be set to appropriate brightness. In addition, when the ceiling height is temporarily set when generating the 3D model, since the volume of the room is proportional to the area, the intensity of the light source can be set based on the area instead of the volume. Similar effects can be obtained. The intensity of the light source can be set to about three levels based on the volume of the room, for example.

  In a house, since the room name generally indicates the size of the room, each room can be similarly set to an appropriate brightness by setting the intensity of the light source using the room name. In this case, the correspondence between the room name and the intensity of the light source can be related by using a simple table.

(Operation of CAD system)
Next, the overall flow of the CAD system described with reference to FIG. 1 will be described. FIG. 7 is a flowchart for explaining the operation of the CAD system.

  As shown in FIG. 7, a plan view is first created using the 2D CAD unit 12 (S102). At this time, the 2D symbol 126 is also arranged on the plan view. When the 2D data acquisition unit 102 of the 3D model generation system 100 acquires 2D data (S104), the building three-dimensionalization unit 104 generates a 3D model by three-dimensionalizing the floor plan of the building (S106). The 3D symbol arrangement unit 108 refers to the storage unit 106 based on the 2D symbols arranged in the plan view, and arranges the 3D symbol 136 in the 3D model 132 (S108).

  Next, the light source arrangement unit 110 arranges light sources based on the 2D symbols of illumination in the plan view (S110). If there is no 2D symbol of illumination in the room, or based on the shape of each room, the center of the room in the plane direction is acquired (S112). Then, it is determined whether or not the center in the plane direction is in the indoor space (S114). If it is in the room, the light source is arranged at the center in the plane direction as it is (S116). If it is not in the room, a light source is placed at the position of the room name in the plan view (S118).

  When the 3D data is transferred from the 3D data output unit 112 of the 3D model generation system 100 to the modeling unit 14, the operator adjusts the 3D data in the modeling unit 14 (S120), and is visualized and output in the rendering unit 16. (S122) or the VR image generation unit 20 generates a VR image (S124).

  As described above, according to the 3D model generation system according to the present invention, when generating a 3D model from a plan view of a building such as a house, the generation of the 3D model is simplified, and high speed can be achieved without impairing intuition. A 3D model that can be rendered is generated. Therefore, it is possible to greatly reduce the time required to create a 3D model required to create a 3D image (perspective view or perspective view) and the rendering time required to create a VR image. As a result, trial and error can be repeated several times in a short time, and the architectural perspective and VR image can be presented to the customer from the initial stage of the design or each time the design is changed.

[Second Embodiment]
A second embodiment of the 3D model generation system according to the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the first embodiment, 2D symbols are simply replaced with corresponding 3D symbols. In contrast, in the present embodiment, a plurality of 3D symbols are associated with 2D symbols.

  FIG. 8 is a diagram for explaining the configuration of the model generation system according to the second embodiment. As illustrated in FIG. 8A, the 3D model generation system 100 includes a generation pattern specifying unit 114 that specifies a generation pattern of 3D data to be generated. The generation pattern may be specified by an operator's operation as an operation condition of the 3D model generation system 100, or a flag for specifying the generation pattern may be included in 2D data or individual 2D symbols.

  Further, in the present embodiment, the storage unit 116 uniquely determines a detailed 3D symbol having a large number of polygons, a simple 3D symbol combining one or more primitives, or no 3D symbol depending on the 2D symbol 126 and the generation pattern. A table 118 is stored. FIG. 8B is a diagram illustrating an example of the configuration of the table 118. In the figure, A2 to D2 are defined as 2D symbols, and high definition, medium definition, and low definition are defined as generation patterns. In contrast, detailed 3D symbols A3-1 to D3-1, simple 3D symbols A3-2 to D3-2, extremely simple 3D symbols A3-3, and C3-3 are stored so as to be uniquely determined. . When the generated pattern is low definition, 3D symbols corresponding to 2D symbols B2 and D2 are not stored.

  The 3D symbol arrangement unit 108 arranges 3D symbols (A3 to D3) corresponding to the 2D symbols 126 (A2 to D2) in the 3D model 132 of the building according to the generation pattern specified by the generation pattern specification unit 114. . Further, when the corresponding 3D symbol is not stored as in the case of the low definition, the 3D symbol is not arranged.

  Thereby, a plurality of 3D symbols having different generation patterns can be easily used together for one 2D symbol according to the purpose. For example, by specifying a low generation pattern during trial and error, an image is generated at high speed using a simple 3D symbol with a light calculation load, and when the plan is fixed, a high generation pattern is specified and a fine 3D symbol is specified. Can be used. Therefore, the operator can review the plan at high speed and present a suitable image to the customer.

  In addition, the generated pattern is not necessarily a definition of detail, but a pattern in which only a 3D symbol of a specific accessory is arranged or a pattern in which only a specific accessory is refined and the rest is simplified may be provided. Good.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used as a 3D model generation system that generates a 3D model from a plan view of a building such as a house.

It is a figure explaining the whole CAD system structure. It is a figure explaining the structure of a model production | generation system. It is a figure which shows the example of data. It is a figure explaining 3D symbol. It is a figure which shows the example of 3D image. It is a figure explaining the automatic arrangement | positioning of a light source. It is a flowchart explaining operation | movement of a CAD system. It is a figure explaining the structure of the model generation system concerning 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... System 12 ... 2DCAD part 14 ... Modeling part 16 ... Rendering part 18 ... Image output part 20 ... VR image generation part 22 ... VR data output part 100 ... 3D model generation system 102 ... 2D data acquisition part 104 ... Building three-dimensionalization part DESCRIPTION OF SYMBOLS 106 ... Memory | storage part 108 ... 3D symbol arrangement | positioning part 110 ... Light source arrangement | positioning part 112 ... 3D data output part 114 ... Generation | occurrence | production pattern designation | designated part 116 ... Memory | storage part 122 ... Plan view 122a ... Living room dining room 122b ... Western-style room 122c ... Corridor 124a ... Kitchen 124b ... Cupboard 126 ... 2D symbol 126a ... 2D symbol of sofa 126b ... 2D symbol of table 128 ... Room name 132 ... 3D model 136 ... 3D symbol 136a ... 3D symbol of sofa 136b ... 3D symbol of table 138 ... Light source

Claims (1)

A 2D data acquisition unit for acquiring 2D data including a plan view of the building and a 2D symbol of an incidental object arranged in the plan view of the building;
A three-dimensional building unit for generating a 3D model of the building from the plan view of the building;
A storage unit that stores in advance the 3D symbol of the accessory associated with the 2D symbol of the accessory;
A 3D symbol arrangement unit that arranges a 3D symbol corresponding to the 2D symbol in a 3D model of the building with reference to the storage unit based on the 2D symbol of the accessory arranged in the plan view of the building ;
A generation pattern designating unit for designating a generation pattern when generating a 3D model of the accessory ,
The 3D symbol is made by combining the primitive is a polygon having a large number of detailed 3D symbols and one or more basic shapes of two-dimensional or three-dimensional, and simple 3D set the transmittance to be translucent surface Consists of symbols ,
The storage unit is a combination of detailed 3D symbols having a large number of polygons, primitives that are one or more two-dimensional or three-dimensional basic figures, and a half-surface on the surface, depending on the 2D symbols and generation patterns of the accessories. Stores a simple 3D symbol configured by setting transparency to be transparent, or a table in which no 3D symbol is uniquely determined;
The 3D symbol arrangement unit refers to a table stored in the storage unit according to the generation pattern specified by the generation pattern specification unit, and for a specific accessory arranged in the plan view of the building A detailed 3D symbol is arranged in a 3D model of the building, a simple 3D symbol is arranged in the 3D model of the building, or the 3D model of the building is generated without arranging the 3D symbol. 3D model generation system.