JP4372128B2 - 3D model drawing device - Google Patents

Description

  The present invention relates to a three-dimensional model drawing apparatus, and more specifically, a three-dimensional model that displays on a screen a three-dimensional model in which attribute information is assigned to each element constituting an analysis object divided into a finite number of elements. The present invention relates to an improvement of a model drawing apparatus.

  In general, when simulating a state in which heat, pressure, or the like is transmitted, a model obtained by dividing an analysis object into a finite number of elements is used. In particular, in the design of heat exchangers used in facilities such as boilers, there are many cases in which a three-dimensional structure is analyzed using a three-dimensional model created in advance. The three-dimensional model is composed of a plurality of elements to which attribute information such as position and temperature is added, and is created using a model generation device. By changing the attribute value of each element in the three-dimensional model generated by the model generation device, a change such as a temperature distribution on the analysis target is simulated, that is, simulated.

  Normally, when creating or simulating a 3D model, attribute values are appropriately assigned, or a 3D model is displayed on the screen using a drawing device to determine whether the simulation is being performed properly. Is called. This drawing apparatus displays a three-dimensional model in three dimensions by arranging each element based on position information given as attribute information. In a conventional 3D model drawing device, when displaying an element designated by the user (herein referred to as a selection area), only the selection area is displayed as a drawing target, or all elements of the 3D model are displayed. In addition to displaying as a drawing target, a process of displaying the selected area in different display colors is performed. For this reason, there has been a problem in that the positional relationship of the selected region in the three-dimensional structure may be difficult to understand or may be hidden behind other drawing objects.

  FIGS. 26A and 26B are diagrams showing an example of a screen display of a three-dimensional model by a conventional drawing apparatus. FIG. 26A shows a heat exchanger model 100 including a plurality of fins 101. In this example, all the fins 101 are displayed as drawing objects, and the user-specified selection area 103 is displayed with a display color different from other drawing objects. The fin 101 corresponds to a heat radiating plate or a heat absorbing plate in the heat exchanger, and is divided into a number of rectangular regions 102. In this heat exchanger model 100, the fin 101 is divided into 9 × 9 = 81 rectangular regions 102 in the x-axis direction and the y-axis direction, and ten such fins 101 are arranged in the z-axis direction.

  Each rectangular area 102 is an element in the heat exchanger model 100, and various attribute values such as fin numbers are given together with position coordinates in the space. In FIG. 26A, all the elements of the heat exchanger model 100 are displayed as drawing targets, the elements whose fin numbers are 1 to 3 and whose x coordinate is in the range of 0 to 5 are selected regions 103. It is displayed as. In this display method, the position of the selection area 103 in the three-dimensional structure can be recognized, but a part of the selection area 103 is hidden behind the fin 101.

  On the other hand, FIG. 26B shows a case where only the selection area 103 is displayed as a drawing target. In this display method, the selection area 103 is not difficult to see by other drawing objects, but the position of the selection area 103 in the three-dimensional structure is difficult to understand.

  FIGS. 27A and 27B are diagrams showing another example of a three-dimensional model displayed on the screen by a conventional drawing apparatus. FIG. 27A shows an example of a screen display of the heat exchanger model 110 in which the fin group 111 and the pipe 112 are arranged. In this heat exchanger model 110, a fin group 111 composed of a large number of fins is accommodated in a housing, and a pipe 112 is arranged so that a part surrounds the housing and the other part sews the fin group 111. In this example, a part of the pipe 112 that passes through the fin group 111 and is arranged in the housing is designated as the selection region 112a, and the display color is different from other drawing objects. It is hidden. For this reason, it is completely unknown where the selection region 112a exists in the three-dimensional structure. On the other hand, FIG. 27B shows a case where only the selection area 112a is displayed as a drawing target. In this case, although the selection area 112a is displayed, it is difficult to recognize the position in the three-dimensional structure or the position in the entire pipe 112.

  As described above, in the conventional 3D model drawing apparatus, only the selected area is displayed as a drawing target, or all elements are displayed as the drawing target and the selected area is displayed with a different display color from other drawing targets. Therefore, there is a problem that the positional relationship of the elements in the three-dimensional structure is difficult to understand or may be hidden behind other drawing objects.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a three-dimensional model drawing apparatus capable of narrowing down a drawing target and displaying a selected region when displaying a three-dimensional model on a screen. To do. In particular, it is an object of the present invention to provide a three-dimensional model drawing apparatus with improved operability when a selected region is displayed by designating a part of a three-dimensional structure such as a heat exchanger as a drawing target.

The three-dimensional model drawing apparatus according to the first aspect of the present invention uses a part or all of a three-dimensional model in which attribute information is assigned to each element constituting an analysis object divided into a finite number of elements as a drawing target. In the 3D model drawing apparatus that displays on the screen, the extraction condition specified by the user and the attribute information of each element constituting the drawing target are compared, and the element is extracted based on the comparison result to be a new drawing target. a repeated element extracting means extracting process, the series of extraction process by the element extracting means, for selecting the drawing object be any extraction user is obtained as an extraction result of the extraction process of selecting a reference region a reference area designation unit, and displays the drawing object that has been selected in the reference area, with different display colors for drawing object obtained by the above series of extraction A Shimesuru drawing object display means, the extraction condition is configured to be specified by the user each time the extraction process is repeated.

In this three-dimensional model drawing apparatus, the extraction condition specified by the user is compared with the attribute information of each element constituting the drawing target, and an extraction process for extracting an element based on the comparison result to be a new drawing target is performed. Repeatedly. At that time, a drawing target obtained as an extraction result of the extraction process selected by the user is designated as the reference area, and the drawing target designated in the reference area is displayed, and the series of extraction processes The drawing objects obtained by the above are displayed with different display colors. According to such a configuration, the drawing target can be narrowed down by designating a new extraction condition for each extraction process, so that the drawing target can be displayed by appropriately specifying the reference area. In particular, by selecting one of the extraction results in a series of extraction processes, a reference area can be specified, so a part of a three-dimensional structure such as a heat exchanger can be easily specified as a drawing target, It is possible to improve the operability when the drawing target obtained by the series of extraction processes is displayed as the selection area.

  A three-dimensional model drawing apparatus according to the second aspect of the present invention includes unit display means for displaying two or more extraction condition input units for inputting the extraction conditions in addition to the above-described configuration, and each of the extraction condition input units includes Is an attribute designating unit for designating the attribute information, and an extraction method for designating one of the extraction results of other extraction condition input units and the extraction from all elements of the three-dimensional model as the extraction method A first operation input unit for displaying a drawing target obtained as an extraction result of the extraction process by the element extraction unit; and a second operation for displaying the drawing target on the drawing target display unit An input unit and a third operation input unit for designating a drawing target displayed based on an operation of the first operation input unit as the reference area are respectively arranged. Configured to be. According to such a configuration, the attribute information designation means and the extraction method designation means are arranged in each extraction condition input unit, so that the drawing target can be narrowed down by specifying the extraction condition for each unit.

  Specifically, by specifying narrowing down as the extraction condition in the extraction method, it is possible to narrow down the extraction results of other extraction condition input units for which the previous extraction processing has been performed, based on the newly specified extraction condition. Further, by operating the first operation input means, it is possible to display a drawing target obtained as an extraction result of the extraction process based on the newly specified extraction condition. In addition, by operating the second operation input means, the drawing target specified in the reference area is displayed, and the display color is displayed for the drawing target obtained by a series of extraction processes based on the newly specified extraction condition. It can be displayed differently. In addition, by operating the third operation input unit, a drawing target obtained as an extraction result of the extraction process based on the newly specified extraction condition and displayed by the operation of the first operation input unit A target can be designated as a reference area.

  In the 3D model drawing apparatus according to the third aspect of the present invention, in addition to the above configuration, when the reference region is not specified when the second operation input unit is operated, the drawing target display unit All elements are configured to be displayed as a reference area. According to such a configuration, when the second operation input unit is operated, if the reference area has already been specified by the user, the drawing target specified in the reference area is displayed as the reference area, and the user If the reference area is not designated by the above, all elements of the three-dimensional model are displayed as the reference area. Therefore, when displaying the three-dimensional model, the drawing area can be displayed by appropriately designating the reference area.

  In the three-dimensional model drawing apparatus according to the fourth aspect of the present invention, in addition to the above configuration, if element addition is specified in the extraction condition, the element extraction unit extracts elements from all the elements based on the extraction condition. Then, it is configured to be added to the extraction result of the previous extraction process and set as the new drawing target. According to such a configuration, if element addition is specified as an extraction condition, elements extracted from all elements are added to the extraction result of the previous extraction process and become a new drawing target. Thus, an extraction element can be added, and convenience in designating a reference area or a selection area can be improved.

  In addition to the above-described configuration, the three-dimensional model drawing apparatus according to the fifth aspect of the present invention includes an extraction condition input unit in which each extraction condition input unit is subjected to extraction processing by designating extraction from all the elements as an extraction method. The input order display means for displaying the input order with respect to is arranged. According to such a configuration, since the input order is displayed on each extraction condition input unit, it is possible to improve convenience when the drawing conditions are narrowed down by specifying the extraction conditions in order for each extraction condition input unit. In particular, when an extraction process performed by designating element addition is included in one of a series of extraction processes, the drawing target obtained by the series of extraction processes changes when the order of the extraction processes changes. When the input order is displayed, it is convenient when the extraction condition is changed and a series of extraction processes are executed again.

  According to the three-dimensional model drawing apparatus according to the present invention, the drawing target can be narrowed down by specifying a new extraction condition for each extraction process, so that the drawing target can be displayed by appropriately specifying the reference area. it can. In particular, by specifying one of the extraction results in a series of extraction processes, the reference region can be specified, so a part of a three-dimensional structure such as a heat exchanger can be easily specified as a drawing target, It is possible to improve the operability when the drawing target obtained by the series of extraction processes is displayed as the selection area.

  FIG. 1 is a block diagram showing an example of a schematic configuration of a heat exchanger analysis system including a three-dimensional model drawing apparatus according to an embodiment of the present invention. The heat exchanger analysis system 10 is a system for simulating a state in which heat and pressure are transmitted using a heat exchanger as an analysis object, and is provided as a function on an information processing terminal such as a personal computer, for example.

  The heat exchanger analysis system 10 includes a model generation unit 11, a heat exchanger model storage unit 12, a simulation unit 13, a simulation result storage unit 14, an operation input unit 15, a data reading unit 16, a three-dimensional model drawing unit 17, and a display 18. Consists of. The model generation unit 11 performs a process of generating a heat exchanger model by dividing an analysis object (in this case, a three-dimensional structure such as a heat exchanger) into a finite number of elements for modeling.

  The element is the minimum processing unit of the analysis processing in the simulation, and an element having a three-dimensional extent in the space (herein referred to as a solid element) and an element having a two-dimensional extent (here Then, it will be called a shell element). In the case of a shell element, the intersection of boundary lines between elements is called a node. In the case of a solid element, with respect to a boundary surface between elements (sometimes referred to as an element surface), the intersection of the intersection lines between the boundary surfaces is a node.

  The heat exchanger model is a three-dimensional model created by giving attribute information to each element, and includes a plurality of elements to which attribute information is given. Specifically, for each node, a position in space and an identification number (referred to as a node number here) are designated, and an identification number (referred to as an element number here) for each element. The heat exchanger model is created by designating various designation numbers and the node numbers of the nodes constituting the element. Various designation numbers include element attribute numbers, element type numbers, and material numbers.

  The heat exchanger model generated by the model generation unit 11 is stored in the heat exchanger model storage unit 12 and used for simulation.

  The simulation unit 13 assigns parameters (variables) indicating physical quantities such as temperature, pressure, displacement, and speed to the nodes and elements of the heat exchanger model, and the boundary condition specified by such parameters or the initial value Analysis processing is performed based on conditions. A parameter assigned to an element is attribute information of the element. Usually, creating a three-dimensional model composed of a plurality of elements to which such attribute information is assigned is called modeling work.

  Analysis processing of the heat exchanger model is performed based on a difference method or a finite element method, and a change in temperature distribution on the analysis target is simulated. The processing result of such analysis processing is stored in the simulation result storage unit 14 as a simulation result. This simulation result is a model in which an attribute value indicating a physical quantity is changed with respect to a model stored in the heat exchanger model storage unit 12.

  The operation input unit 15 includes a pointing device such as a keyboard and a mouse, and performs an operation of generating an input signal based on a user operation. The display 18 is a display data output device having a display screen.

  The data reading unit 16 reads the heat exchanger model (data) from the heat exchanger model storage unit 12 or reads the simulation result from the simulation result storage unit 14 and inputs it to the three-dimensional model drawing unit 17. Yes.

  The three-dimensional model drawing unit 17 displays the heat exchanger model generated by the model generation unit 11 and the processing result by the simulation unit 13 on the display 18 based on the position information given to each element as attribute information. Processing is in progress. When displaying the model in the heat exchanger model storage unit 12 or the model in the simulation result storage unit 14, an element to be drawn is specified based on the input signal from the operation input unit 15, and the extraction condition specified by the user The selection area is determined based on the above.

  FIG. 2 is a block diagram illustrating a configuration example of a main part of the heat exchanger analysis system 10 of FIG. 1, in which a functional configuration in the three-dimensional model drawing unit 17 is illustrated. The three-dimensional model drawing unit 17 includes a unit display unit 1, a reference area specifying unit 2, an extraction condition specifying unit 3, an element extracting unit 4, a drawing target display unit 5, and an initialization processing unit 6.

  The unit display unit 1 performs an operation of displaying an extraction condition input window on the display 18 based on an input signal from the operation input unit 15. The extraction condition input window is a window for inputting an extraction condition, and a plurality of extraction condition input units are arranged in the window. Each extraction condition input unit is a display area that allows the user to specify an extraction condition.

  In each extraction condition input unit, an attribute designation unit, an extraction method designation unit, first to third operation input units, and an input order display unit are arranged. The attribute designation part is an input area for designating the type of attribute information and the range of attribute values. Here, as the type of attribute information, the element number, element attribute number, element type number, material number, each coordinate or Any one of the solid elements can be selected and designated.

  The extraction method designating unit is an input area for designating one of narrowing down the extraction results of other extraction condition input units and extraction from all elements of the three-dimensional model as the extraction method. Here, it is assumed that any one of “whole”, “addition”, “extraction”, “exclusion”, or “whole exclusion” can be selected and specified as the extraction method.

  “Whole” is an extraction method in which all elements of the three-dimensional model are extracted, and the elements specified by the attribute specifying unit are extracted within the range specified by the attribute specifying unit to be drawn. is there. “Add” is an extraction method in which elements extracted from all elements of the three-dimensional model are added to the extraction results of other extraction condition input units to be drawn.

  “Extraction” is an extraction method in which an element whose attribute value specified by the attribute specification unit is within the range specified by the attribute specification unit is extracted from the extraction result of another extraction condition input unit and is drawn. It is.

  “Exclude” excludes elements whose attribute values specified in the attribute specification section are within the range specified in the attribute specification section from the extraction results of other extraction condition input units, and draws the remaining elements This is a target extraction method. “Exclude all” excludes elements whose attribute values specified by the attribute specification unit are within the range specified by the attribute specification unit from all elements of the three-dimensional model, and sets the remaining elements as drawing targets. This is an extraction method. “Extraction” and “exclusion” are extraction methods for narrowing down extraction results based on extraction conditions input in other extraction condition input units.

  The first operation input unit is an operation input unit for displaying a drawing target obtained as an extraction result of the extraction process by the element extraction unit 4. Here, it is assumed that a drawing button (hereinafter referred to as an extraction region drawing button) for displaying only a drawing target as an extraction result as an extraction region is provided as the first operation input unit.

  The second operation input unit is an operation input unit for causing the drawing target display unit 5 to display the drawing target. Here, the drawing target specified in the reference area is displayed, and the extraction processing by the element extraction unit 4 is performed. The drawing object obtained as a result of the extraction is provided with a drawing button (herein referred to as a reference area drawing button) for displaying with a different display color.

  The third operation input unit is an operation input unit for designating a drawing target displayed based on the operation of the first operation input unit as a reference area. Here, as a third operation input unit, an icon (hereinafter referred to as a reference region designation icon) for designating a drawing target obtained as an extraction result of the extraction processing by the element extraction unit 4 as a reference region is provided. Shall be.

  The extraction area drawing button is a key display for designating an extraction result as an extraction area and drawing only the extraction area. The reference area drawing button is a key display for displaying the drawing target specified in the reference area and displaying the extraction result (extraction area) with different display colors.

  Both the extraction area drawing button and the reference area drawing button are triggers for starting the drawing process, and when these buttons are operated, drawing of the three-dimensional model is started based on the button operation.

  The reference area designation icon is a display for designating the extraction result of the extraction process as a reference area until a new reference area is designated in another extraction condition input unit. Here, the reference area designation icon is displayed based on the operation of the extraction area drawing button. In addition, when the reference area designation icon is operated before the extraction area drawing button or the reference area drawing button is operated in another extraction condition input unit, the extraction result of the extraction condition input unit to which the icon belongs is referred to. It shall be specified in the area. On the other hand, when the reference area designation icon is not operated until the extraction area drawing button or the reference area drawing button is operated in another extraction condition input unit, the icon display is performed based on the operation of the button. Canceled.

  In addition, the extraction area drawing button is operated in another extraction condition input unit, or the extraction area drawing button or reference is designated by specifying an extraction method of “whole” or “whole exclusion” in another extraction condition input unit. When the area drawing button is operated, the designation of the reference area is canceled.

  The input order display section is a display area that displays the input order for the extraction condition input units that have been extracted by specifying extraction from all elements as the extraction method. Specifically, for extraction condition input units for which extraction processing has been performed by specifying an extraction method of “whole” or “whole exclusion”, extraction methods other than “whole” and “whole exclusion” are then performed. For other extraction condition input units that have been subjected to extraction processing by designating an identification number, an identification number indicating the input order is displayed. Here, the input order display unit is displayed based on the operation of either the extraction area drawing button or the reference area drawing button. In addition, when extraction processing is performed by newly specifying either “whole” or “whole exclusion”, the display of the input order in other extraction condition input units is cancelled.

  The extraction condition designating unit 3 performs an operation of designating the extraction condition based on the input signal from the operation input unit 15. Specifically, information input in the attribute specifying unit and the extraction method specifying unit is specified as the extraction condition.

  The element extraction unit 4 compares the extraction condition specified by the user with the attribute information of each element constituting the drawing target in the model data, and extracts an element based on the comparison result to obtain a new drawing target Repeatedly. Specifically, elements that match the extraction conditions specified by the extraction condition specifying unit 3 are extracted by a predetermined extraction method. In other words, if “whole” is specified in the extraction method specification section, all elements of the three-dimensional model are extracted, and the attribute value of the attribute specified in the attribute specification section is specified in the attribute specification section. Elements present within the range are extracted.

  If “addition” is specified as the extraction condition, all elements of the three-dimensional model are extracted, elements are extracted from all elements based on the extraction conditions, and the extraction results of other extraction condition input units are extracted. That is, it is added to the extraction result of the previous extraction process. If “extract” is specified, an element whose attribute value specified by the attribute specification unit is within the range specified by the attribute specification unit is extracted from the extraction result of another extraction condition input unit. Is issued. If "exclude" is specified, elements whose attribute values specified in the attribute specification section are within the range specified in the attribute specification section are excluded from the extraction results of other extraction condition input units. The remaining elements are extracted. Also, if “exclude all” is specified, elements whose attribute values specified in the attribute specification part are within the range specified in the attribute specification part are excluded from all elements of the three-dimensional model, The remaining elements are extracted.

  Based on the input signal from the operation input unit 15, the reference region designating unit 2 performs an operation of designating a drawing target obtained as an extraction result of any of a series of extraction processes by the element extraction unit 4 as a reference region. . That is, a drawing target obtained as an extraction result of the extraction process designated by the user in the series of extraction processes is designated as the reference area. Specifically, if the reference area designation icon displayed based on the operation of the extraction area drawing button is operated until a drawing button belonging to another extraction condition input unit is operated, the extraction condition input unit to which the icon belongs The extraction result is designated as the reference area.

  The drawing target display unit 5 displays the drawing target specified in the reference area, and performs an operation of displaying the drawing target obtained by a series of extraction processes by the element extraction unit 4 with different display colors. . Here, if the reference area is not specified when the second operation input unit is operated, all the elements of the three-dimensional model are displayed as the reference area. That is, when the reference area drawing button is operated, if the reference area is already specified by the user, the drawing target specified in the reference area is displayed as the reference area, and if the reference area is not specified by the user All elements of the 3D model are displayed as reference areas.

  The initialization processing unit 6 performs processing for initializing display by the unit display unit 1 when model data is input from the data reading unit 16. Specifically, the display of each extraction condition input unit in the extraction condition input window is initialized. Here, it is assumed that the parameter for designating the input order is “1” and the initialization process is performed to hide the display of the input order and the reference area designation icon in each unit. Further, it is assumed that initialization processing is performed in which both the reference area and the extraction area are all elements of the three-dimensional model.

  Here, an operation when the drawing button of the same extraction condition input unit is operated again after the operation of the drawing button will be described. In any extraction condition input unit, the drawing button is operated by specifying the attribute and the extraction method, and then the drawing button without changing the attribute and the extraction method for the same extraction condition input unit, that is, Operation of either the extraction area drawing button or the reference area drawing button is referred to as “re-operation” for the extraction condition input unit. In the 3D model drawing apparatus according to the present embodiment, when the drawing button is “re-operated”, the previous extraction area is used without performing the attribute information comparison process. At this time, the process for changing the input order, that is, the process for incrementing the input order is not performed, and the previous input order is displayed as it is.

  FIG. 3 is a diagram showing an example of the operation in the 3D model drawing unit 17 of FIG. 2, and the appearance of the extraction condition input window 21 and the 3D model display window 31 displayed on the display screen 18 a of the display 18. It is shown. In this display screen 18a, an extraction condition input window 21 is arranged at the upper stage, and a three-dimensional model display window 31 is arranged at the lower stage.

  In the extraction condition input window 21, a close button 22, drawing method designation buttons 23a and 23b, and four extraction condition input units 24 are arranged. The close button 22 is an icon for ending the display process of the window 21. The drawing method designation button 23a is a key display for designating a drawing method of the three-dimensional model, and is used when a node number is displayed as a drawing target. The drawing method designation button 23b is a key display for designating a drawing method of the three-dimensional model, and is used when displaying coordinate axes together with the three-dimensional model. By displaying the coordinate axes together with the three-dimensional model, when specifying the upper limit value and the lower limit value of the position coordinates as the extraction condition, the correspondence between the position and the coordinates on the three-dimensional model is easy to understand visually and is convenient. The extraction condition input units 24 are arranged side by side in the horizontal direction (left-right direction).

  The 3D model display window 31 is a display area in which a 3D model is drawn, and is displayed based on a predetermined operation input. The display process of the window 31 is ended by operating the close button 32. In this example, the extraction condition input window 21 is arranged in the upper stage, but is arranged in the lower stage, the extraction condition input window 21 and the 3D model display window 31 are arranged on the left and right, or on the 3D model display window 31. The extraction condition input windows 21 may be arranged overlapping each other. When the extraction condition input window 21 and the 3D model display window 31 are arranged on the left and right, the extraction condition input units 24 are arranged side by side in the vertical direction (vertical direction).

  FIG. 4 is a diagram showing a configuration example of the extraction condition input unit 24 in the extraction condition input window 21 of FIG. In the extraction condition input unit 24, attribute designation units 41 and 42a to 42c, an extraction method designation unit 43, and a drawing button display area 44 are arranged. The attribute designating units 41 and 42a to 42c include an input field 41 for designating the type of attribute information and input fields 42a to 42c for designating a range of attribute values. The input field 41 is arranged in the upper stage, and the input field is provided with a pull-down button 41a for displaying a list of selectable attribute information types and a display area for displaying the type of attribute information selected and designated. ing.

  The input fields 42a to 42c are arranged in the middle stage. In the input field, an input box 42a for inputting the lower limit value of the attribute value, an input box 42b for inputting the upper limit value, and an intermediate increment value are input. An input box 42c is provided. The intermediate increment value is an increment when the range of the attribute value is designated by an integer, and the upper limit and the lower limit thereof are designated at intervals. Here, it is assumed that the input box 42c is displayed only when an attribute other than coordinates is designated.

  The extraction method designating unit 43 is arranged in the middle, and the extraction method designating unit is provided with a pull-down button 43a for displaying a list of selectable extraction methods and a display area for displaying the selected and designated extraction methods. ing.

  The drawing button display area 44 is arranged in the lower stage. In the display area 44, the node drawing buttons 45a and 45b for displaying the nodes included in the drawing target and the elements for displaying the elements constituting the drawing target are displayed. Drawing buttons 46a and 46b are provided. Both the node drawing button 45a and the element drawing button 46a are extraction area drawing buttons, and the node drawing button 45b and the element drawing button 46b are both reference area drawing buttons. In this example, the buttons are arranged in the horizontal direction in the order of the node drawing button 45a, the node drawing button 45b, the element drawing button 46b, and the element drawing button 46a from the left. Here, both the reference area designation icon and the input order display section are arranged in the lower stage.

  FIGS. 5A and 5B are diagrams showing an example of the operation in the extraction condition input unit 24 of FIG. FIG. 5A shows the state of the selection window 41b displayed based on the operation of the pull-down button 41a. The selection window 41b is a display for displaying a list of selectable attribute information types and allowing the user to select and specify one of these types of attribute information, and is displayed on the unit in an overlapping manner.

  Here, as item names for specifying attributes, “Select by element number”, “Select by element attribute number”, “Select by element type number”, “Select by material number”, “Select by X coordinate”, “Y” It is assumed that “select by coordinates”, “select by Z coordinates”, and “select solid” are displayed in the selection window 41b. The item name being selected is displayed in reverse video.

  FIG. 5B shows the state of the selection window 43b displayed based on the operation of the pull-down button 43a. The selection window 43b is a display for displaying a list of selectable extraction methods and allowing the user to select and specify one of these extraction methods, and is displayed on the unit in an overlapping manner.

  Here, “all”, “add”, “extract”, “exclude”, and “exclude all” are displayed in the selection window 43b as item names for designating the extraction method. The item name being selected is displayed in reverse video.

  6 to 10 are diagrams showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and display screens in which an extraction region is drawn by designating the heat exchanger model A composed of a plurality of fins A1. 18a is shown. The heat exchanger model A is a three-dimensional model including ten fins A1 corresponding to a heat radiating plate or a heat absorbing plate in the heat exchanger. The fin A1 is divided into 9 × 9 = 81 rectangular regions (shell elements) A2 with respect to the x-axis direction and the y-axis direction. The fins A1 are arranged at a predetermined pitch in the z-axis direction.

  FIG. 6 shows a case where the drawing method designation button 23b is operated and the element drawing button 46b is operated in one extraction condition input unit 24 (hereinafter referred to as the first unit). . In this example, all elements of the heat exchanger model A are displayed as reference areas, and elements belonging to the three fins A1 designated by the material numbers are drawn as extraction areas A3. Specifically, the item name “select by material number” is designated in the input field 41 of the attribute designation part, and the lower limit value “1”, the upper limit value “3”, and the intermediate increment value “1” are entered in the input fields 42a to 42c. The extraction method specifying unit 43 specifies the extraction method “whole”.

  The extraction area A3 is an extraction result based on these extraction conditions, and the display color is different from other areas in the reference area. For example, the extraction area A3 is drawn in red, and the other areas are drawn in white. In the first unit to which the extraction condition is input, an input order display unit 51 by the operation of the element drawing button 46b is displayed. In this first unit, the input order “1” is displayed on the input order display section 51.

  FIG. 7 shows a case in which the extraction result is narrowed down by specifying the extraction method “extraction” in another extraction condition input unit 24 (hereinafter referred to as a second unit). Specifically, the item name “select by X coordinate” is specified in the input field 41 of the attribute specifying part, the lower limit value “0” and the upper limit value “5” are specified in the input fields 42a to 42c of the attribute specifying part. The extraction method designation unit 43 designates the extraction method “extraction”. When these drawing conditions are specified and the element drawing button 46b is operated, all the elements of the heat exchanger model A are displayed as reference areas, and the extraction results of the first unit subjected to the previous extraction process are displayed above. The drawing target narrowed down by the extraction condition is drawn as the extraction area A4.

  In the second unit in which the extraction condition is input, an input order display unit 51 by the operation of the element drawing button 46b is displayed. In this second unit, the input order “2” is displayed on the input order display section 51.

  FIG. 8 shows a case where the element drawing button 46a is operated instead of the element drawing button 46b in the second unit. In this case, only the extraction area A5 extracted based on the extraction condition is drawn. In addition to the input order “2”, the second unit displays a reference area designation icon 52 by operating the element drawing button 46a.

  FIG. 9 shows a case where the extraction result is narrowed down by specifying an extraction condition in yet another extraction condition input unit 24 (herein referred to as a third unit). Specifically, the item name “select by Y coordinate” is specified in the input field 41 of the attribute specifying part, and the lower limit value “5” and the upper limit value “100” are specified in the input fields 42a to 42c of the attribute specifying part. The extraction method designation unit 43 designates the extraction method “extraction”.

  When these extraction conditions are designated and the element drawing button 46a is operated, an extraction area A6 obtained by narrowing down the extraction result of the second unit subjected to the previous extraction process by the extraction conditions is displayed as a drawing target. In the third unit, in addition to the input order “3”, a reference area designation icon 52 is displayed by operating the element drawing button 46a.

  FIG. 10 shows a case where the element drawing button 46b is operated instead of the element drawing button 46a in the third unit. In this case, all elements of the heat exchanger model A are displayed as the reference area, and the drawing target extracted based on the extraction condition is displayed as the extraction area A7 with different display colors. In the third unit, only the input rank “3” is displayed on the input rank display section 51.

  FIGS. 11 to 13 are diagrams showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and a display in which an extraction region is drawn by designating a heat exchanger model B composed of a plurality of solid elements B1. Screen 18a is shown. The heat exchanger model B is a three-dimensional model obtained by dividing a three-dimensional structure such as a heat exchanger into cubic blocks (solid elements B1). The heat exchanger model B is divided into 9 × 9 × 9 = 729 solid elements B1 with respect to the x-axis direction, the y-axis direction, and the z-axis direction.

  FIG. 11 shows a case where the drawing method designation button 23b is operated and the element drawing button 46b is operated in one extraction condition input unit 24 (hereinafter referred to as a fourth unit). . In this example, all elements of the heat exchanger model B are displayed as reference areas, and a solid element B1 designated by an element number is drawn as an extraction area B2. Specifically, the item name “select by element number” is designated in the input field 41 of the attribute designation part, and the lower limit value “729”, the upper limit value “729”, the intermediate increment value in the input fields 42a to 42c of the attribute designation part. “1” is designated, and the extraction method designation unit 43 designates the extraction method “whole”.

  The extraction area B2 is an extraction result based on these extraction conditions, and is drawn with a display color different from other areas in the reference area. In the fourth unit, an input order display unit 51 by operating the element drawing button 46b is arranged, and an input order “1” is displayed.

  FIG. 12 shows a case where the node drawing button 45a is operated instead of the element drawing button 46b in the fourth unit. In this case, the node B1a included in the extraction region B3 extracted based on the extraction condition is displayed. In addition, in the fourth unit, in addition to the input order “1”, a reference region designation icon 52 is displayed by operating the node drawing button 45a.

  FIG. 13 shows a case where the drawing method designation buttons 23a and 23b are operated and the node drawing button 45a is operated in the fourth unit. In this case, the node number of the node B1a included in the extraction area B4 is displayed. In the fourth unit, in addition to the input order “1”, a reference area designation icon 52 is displayed by operating the node drawing button 45a.

  In this manner, by specifying the extraction condition for each extraction condition input unit 24, the drawing target can be narrowed down, so that the drawing region can be drawn by appropriately narrowing down the drawing target.

  14 to 21 are diagrams showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and drawing the extraction region by designating the heat exchanger model C in which the fin group C2 and the pipe C3 are arranged. The displayed display screen 18a is shown. The heat exchanger model C is a three-dimensional model including a fin group C2 housed in a housing and a pipe C3 arranged so that a part surrounds the housing and the other part sews the fin group C2. The fin group C2 includes a plurality of fins, and each fin and the pipe C3 are divided into a large number of minute elements C1.

  FIG. 14 shows a case where the element drawing button 46b is operated in the fourth unit. In this example, all elements of the heat exchanger model C are displayed as the reference area, and a part of the pipe C3 designated by the element attribute number is drawn as the extraction area C4. Specifically, the item name “select by element attribute number” is designated in the input field 41 of the attribute designation part, and the lower limit value “19”, the upper limit value “19”, and the intermediate increment are designated in the input fields 42a to 42c of the attribute designation part. The value “1” is designated, and the extraction method designation unit 43 designates the extraction method “whole”.

  The extraction area C4 is an extraction result based on these extraction conditions, and is drawn with a display color different from other areas in the reference area. In this example, a part of the pipe C3 that penetrates the fin group C2 and is arranged in the housing is extracted as the extraction region C4 and has a different display color, but is hidden in the three-dimensional structure. It is completely unknown where the extraction region C4 exists in the three-dimensional structure. In the fourth unit, an input order display unit 51 by operating the element drawing button 46b is arranged, and an input order “1” is displayed.

  FIG. 15 shows a case where only the extraction region C4 is drawn by operating the element drawing button 46a instead of the element drawing button 46b. In this case, although the extraction area C4 is displayed, it is difficult to recognize the position in the three-dimensional structure or the position in the entire pipe C3. In the fourth unit, in addition to the input order “1”, a reference area designation icon 52 is displayed by operating the element drawing button 46a.

  FIG. 16 shows a case where the element drawing button 46a is operated in the third unit. In this example, the entire part of the pipe C3 designated by the element attribute number is extracted as a drawing target and displayed as an extraction area. Specifically, the item name “Select by element attribute number” is designated in the input field 41 of the attribute designation part, and the lower limit value “8”, the upper limit value “21”, and the intermediate increment are designated in the input fields 42a to 42c of the attribute designation part. The value “1” is designated, and the extraction method designation unit 43 designates the extraction method “whole”. In this third unit, in addition to the input order “1”, a reference area designation icon 52 is displayed by operating the element drawing button 46a.

  FIG. 17 shows a case where the extraction result is narrowed down by designating the extraction method “extraction” in the fourth unit after the operation of the reference area designation icon 52 in the third unit. Specifically, the item name “select by element attribute number” is designated in the input field 41 of the attribute designation part, and the lower limit value “19”, the upper limit value “19”, and the intermediate increment are designated in the input fields 42a to 42c of the attribute designation part. The value “1” is designated, and the extraction method designation unit 43 designates the extraction method “extraction”.

  When these extraction conditions are specified and the element drawing button 46b is operated, the extraction result (here, pipe C3) of the third unit subjected to the previous extraction process is specified as the reference area, and the extraction condition Thus, the drawing target with the extraction result narrowed down is displayed as the extraction region C5 with different display colors. In the fourth unit, an input order display unit 51 by operating the element drawing button 46b is arranged, and an input order “2” is displayed.

  In this example, when the reference area designation icon 52 of the third unit is operated, the display of the icon 52 is canceled and the input order display unit 51 is switched to a different display. Specifically, the icon display disappears based on the operation of the icon 52, and the input order display unit 51 (the input order “1” is displayed) displayed together with the icon 52 is displayed in the display area. Is switched to a color different from that before the operation of the icon 52.

  By displaying the drawing target narrowed down based on the extraction condition in this way as the reference area, the extraction area in the reference area is prevented from being hidden by other areas. Here, the positional relationship of the extraction region C5 in the pipe C3) can be easily displayed.

  FIG. 18 shows a case where the element drawing button 46a is operated in the fourth unit. In this example, the fin group C2 designated by the element attribute number is drawn as the extraction area. Specifically, the item name “Select by element attribute number” is designated in the input field 41 of the attribute designation part, and the lower limit value “1”, the upper limit value “1”, and the intermediate increment are designated in the input fields 42a to 42c of the attribute designation part. The value “1” is designated, and the extraction method designation unit 43 designates the extraction method “whole”. In the fourth unit, in addition to the input order “1”, a reference area designation icon 52 is displayed by operating the element drawing button 46a.

  FIG. 19 shows a case where the extraction result is narrowed down by specifying the extraction method “extraction” in the third unit. Specifically, the item name “select by Y coordinate” is specified in the input field 41 of the attribute specifying part, and the lower limit value “3” and the upper limit value “21” are specified in the input fields 42a to 42c of the attribute specifying part. The extraction method designation unit 43 designates the extraction method “extraction”.

  When these extraction conditions are specified and the element drawing button 46a is operated, a drawing target is extracted by narrowing down the extraction result (here, the fin group C2) of the fourth unit subjected to the previous extraction process by the extraction conditions. It is displayed as area C6. In addition to the input order “2”, the third unit displays a reference area designation icon 52 by operating the element drawing button 46a.

  FIG. 20 shows a case where the extraction area C7 is drawn by operating the element drawing button 46b in the third unit after operating the reference area designation icon 52 in the fourth unit. In this case, the extraction result (here, the fin group C2) of the fourth unit on which the previous extraction process has been performed is displayed as the reference area, and the extraction result of the third unit is displayed as the extraction area C7. It is drawn with different colors. In this third unit, an input order display unit 51 by operating the element drawing button 46b is arranged, and an input order “2” is displayed.

  By displaying the drawing target narrowed down based on the extraction condition in this way as the reference area, the extraction area in the reference area is prevented from being hidden by other areas. Here, the positional relationship of the extraction region C7 in the fin group C2) can be easily displayed.

  FIG. 21 shows a case where the extraction result is further narrowed down by specifying the extraction method “extraction” in the first unit. Specifically, the item name “select by Z coordinate” is specified in the input field 41 of the attribute specifying part, the lower limit value “4” and the upper limit value “4” are specified in the input fields 42a to 42c of the attribute specifying part, The extraction method designation unit 43 designates the extraction method “extraction”.

  When these extraction conditions are designated and the element drawing button 46b is operated, the drawing target is extracted by narrowing down the extraction result (here, the fin group C2) of the third unit subjected to the previous extraction process by the extraction conditions. Displayed as a region C7a (first fin). In this first unit, an input order display unit 51 by operating the element drawing button 46b is arranged, and an input order “3” is displayed. In this way, by newly inputting the extraction condition and narrowing down the extraction result, it is easy to further narrow down the extraction region and draw it.

  Steps S101 to S132 in FIGS. 22 to 25 are flowcharts showing an example of the operation in the three-dimensional model drawing unit 17 in FIG. 2, and show processing procedures in the drawing process of the three-dimensional model. FIG. 23 shows a processing procedure when the reference area drawing button is operated after the extraction condition is input, and FIG. 24 shows a processing procedure when the extraction area drawing button is operated after the extraction condition is input. Has been. FIG. 25 shows a processing procedure after displaying the drawing target.

  First, when the model data read by the data reading unit 16 is input, the initialization processing unit 6 initializes the display by the unit display unit 1 (steps S101 and S102). Next, when either the extraction area drawing button or the reference area drawing button is operated, the element extraction unit 4 performs extraction processing according to the operated drawing button and determines an extraction area (steps S103 and S104). ).

  If the operated drawing button is a reference area drawing button, the element extraction unit 4 reads the extraction condition from the extraction condition designation unit 3 based on the button operation (step S105). At this time, if either “whole” or “whole exclusion” is specified as the extraction method by the extraction condition, the input rank is reset to “1” and the input rank “1” is displayed (steps S106 to S106). S108). At this time, the element extraction unit 4 performs attribute information comparison processing for all elements, extracts elements that match the extraction conditions, and determines an extraction region (steps S109 and S110). The drawing target display unit 5 displays all the elements as reference areas and displays the extraction areas with different display colors (step S111). That is, the reference area and the extraction area are displayed in different colors.

  On the other hand, if “whole” and “whole exclusion” are not specified in the extraction method, the current input order is displayed (step S112). At this time, the element extraction unit 4 performs attribute information comparison processing for the previous extraction region, extracts an element that matches the extraction condition, and determines the extraction region (steps S113 and S114). The drawing target display unit 5 displays the reference area if the reference area has been specified up to the previous time, and displays the extracted area extracted in the current extraction process with a different display color (step). S115, S116).

  If no reference area has been designated until the previous time, all elements are displayed as reference areas, and the extracted areas extracted in the current extraction process are displayed with different display colors (steps S115 and S111).

  If the operated drawing button is the extraction area drawing button, first, a reference area designation icon is displayed (step S117). Next, the element extraction unit 4 reads the extraction condition from the extraction condition designation unit 3 based on the button operation (step S118). At this time, if either “whole” or “whole exclusion” is specified as the extraction method by the extraction condition, the input rank is reset to “1” and the input rank “1” is displayed (steps S119 to S119). S121). At this time, the element extraction unit 4 performs attribute information comparison processing for all elements, extracts elements that match the extraction conditions, and determines an extraction region (steps S122 and S123). Then, the drawing target display unit 5 displays the extraction area extracted by the current extraction process as a drawing target (step S124).

  On the other hand, if “whole” and “whole exclusion” are not specified in the extraction method, the current input order is displayed (step S126). At this time, the element extraction unit 4 performs attribute information comparison processing for the previous extraction region, extracts an element that matches the extraction condition, and determines the extraction region (steps S127 and S128). Then, the drawing target display unit 5 displays the extraction area extracted by the current extraction process as a drawing target (step S124).

  Next, when the reference area designation icon is operated after the extraction area is displayed, the reference area designation unit 2 performs processing for designating the current extraction area as the reference area (steps S125 and S129).

  When the drawing button is operated again for the same extraction condition input unit after the drawing target is displayed, the processing procedure from step S104 to step SS129 is repeated (step S130). At that time, if the same drawing button is operated again without changing the extraction condition, the button operation is ignored, and if a different drawing button is operated, the attribute information comparison process is not performed. , The previous extraction area is displayed.

  After the display of the drawing target, if there is no re-operation of the drawing button for the same extraction condition input unit, the parameter for designating the input order is incremented, that is, “1” is added to the input order (step S131). At this time, if the drawing button is operated for another extraction condition input unit, the processing procedure from step S104 to step SS131 is repeated, and if the close button is operated, the drawing process ends (step S132).

  According to the present embodiment, the drawing target can be narrowed down by specifying a new extraction condition for each extraction process, and therefore the drawing target can be displayed by appropriately specifying the reference area. In particular, by specifying one of the extraction results in a series of extraction processes, the reference region can be specified, so a part of a three-dimensional structure such as a heat exchanger can be easily specified as a drawing target, It is possible to improve the operability when displaying the drawing target obtained by the series of extraction processes as the extraction area.

  In this embodiment, the reference area is displayed by operating the reference area drawing button and the extraction area is displayed with a different display color. However, the present invention is not limited to this. It is not something that can be done. For example, instead of changing the display color, the extraction area in the reference area may be displayed with a different brightness from the other areas.

It is the block diagram which showed an example of schematic structure of the heat exchanger analysis system containing the three-dimensional model drawing apparatus by embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration example in a main part of the heat exchanger analysis system 10 in FIG. 1, in which a functional configuration in a three-dimensional model drawing unit 17 is illustrated. FIG. 3 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a state of an extraction condition input window 21 and a three-dimensional model display window 31. It is the figure which showed the structural example of the extraction condition input unit 24 in the extraction condition input window 21 of FIG. It is the figure which showed an example of the operation | movement in the extraction condition input unit 24 of FIG. FIG. 4 is a diagram showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a display screen 18 a in which an extraction region is drawn by designating the heat exchanger model A. FIG. 7 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and illustrates a case where the extraction region of FIG. 6 is narrowed down. FIG. 7 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and illustrates a case where the extraction region of FIG. 6 is narrowed down. It is the figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where the extraction area | region of FIG. 7 or FIG. 8 is narrowed down is shown. FIG. 4 is a diagram showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a display screen 18 a in which an extraction region is drawn by designating the heat exchanger model A. FIG. 3 is a diagram showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a display screen 18 a in which an extraction region is drawn by designating the heat exchanger model B. FIG. 6 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and illustrates a case where a node drawing button 45 a is operated instead of the element drawing button 46 b. It is a figure showing an example of operation in three-dimensional model drawing part 17 of Drawing 2, and the case where node drawing button 45a is operated is shown. FIG. 3 is a diagram showing an example of the operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a display screen 18 a in which an extraction region is drawn by designating a heat exchanger model C. It is the figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where only the extraction area | region C4 is drawn is shown. It is a figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where the element drawing button 46a is operated is shown. FIG. 6 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and illustrates a case where the extraction result is narrowed down after the reference region designation icon 52 is operated. It is a figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where the element drawing button 46a is operated is shown. It is the figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where the extraction result is narrowed down is shown. FIG. 4 is a diagram illustrating an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and illustrates a case where an extraction region C7 is drawn after the reference region designation icon 52 is operated. It is the figure which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the case where the extraction result was further narrowed down is shown. It is the flowchart which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the process sequence in the drawing process of a three-dimensional model is shown. 3 is a flowchart showing an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2, and shows a processing procedure when a reference area drawing button is operated. FIG. 3 is a flowchart showing an example of an operation in the three-dimensional model drawing unit 17 of FIG. 2 and shows a processing procedure when an extraction region drawing button is operated. It is the flowchart which showed an example of the operation | movement in the three-dimensional model drawing part 17 of FIG. 2, and the process sequence after display of drawing object is shown. It is the figure which showed an example of the screen display of the three-dimensional model by the conventional drawing apparatus. It is the figure which showed the other example of the three-dimensional model displayed on the screen by the conventional drawing apparatus.

Explanation of symbols

1 unit display section, 2 reference area designating section, 3 extraction condition designating section,
4 element extraction unit, 5 drawing target display unit, 6 initialization processing unit, 10 heat exchanger analysis system, 11 model generation unit,
12 heat exchanger model storage unit, 13 simulation unit,
14 Simulation result storage unit,
15 operation input section, 16 data reading section,
17 3D model drawing unit, 18 display

Claims (5)

In a 3D model drawing apparatus that displays on the screen as a drawing target a part or all of a 3D model in which attribute information is given to each element constituting an analysis object divided into a finite number of elements,
An element extraction means for comparing an extraction condition specified by a user and the attribute information of each element constituting the drawing target, extracting an element based on the comparison result, and repeatedly performing an extraction process as a new drawing target;
A reference area designating means for selecting, as a reference area, a drawing target obtained as an extraction result of an extraction process selected by the user among a series of extraction processes by the element extraction means;
A drawing object display means for displaying the drawing object selected in the reference area and displaying the drawing object obtained by the series of extraction processes with different display colors ;
The three-dimensional model drawing apparatus , wherein the extraction condition is designated by a user every time extraction processing is repeatedly performed . Unit display means for displaying two or more extraction condition input units for inputting the extraction conditions,
In each of the extraction condition input units, attribute designation means for designating the attribute information;
Extraction method designating means for designating any one of narrowing down the extraction results of other extraction condition input units and extraction from all elements of the three-dimensional model as an extraction method;
First operation input means for displaying a drawing target obtained as an extraction result of the extraction processing by the element extraction means;
A second operation input means for displaying a drawing object on the drawing object display means;
3. The third operation input means for designating a drawing object displayed on the basis of an operation of the first operation input means as the reference area, respectively, is arranged. Dimensional model drawing device.   3. The drawing object display means displays all the elements as reference areas when the reference area is not designated when the second operation input means is operated. 3D model drawing device.   If element addition is specified in the extraction condition, the element extraction unit extracts the element from all the elements based on the extraction condition, adds the element to the extraction result of the previous extraction process, and adds the new drawing target. The three-dimensional model drawing apparatus according to claim 2, wherein:   Each of the extraction condition input units is provided with an input rank display means for displaying an input rank for the extraction condition input unit subjected to extraction processing by specifying extraction from all the elements as an extraction method. The three-dimensional model drawing apparatus according to claim 4.