CN109858143B - Method for generating special-shaped door and window model on arc wall - Google Patents
Method for generating special-shaped door and window model on arc wall Download PDFInfo
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Abstract
The invention provides a method for generating a special-shaped door and window model on an arc wall, which is used for generating the special-shaped door and window model on the arc wall according to input parameters and belongs to the technical field of computer graphics and computer-aided design. The method provided by the invention comprises the steps of inputting parameter validity check and generating a side sideline of the arc wall according to the input parameter; generating a side surface curved surface-cylindrical surface of the arc wall according to the side line of the arc wall and the local coordinate system; determining the position relation of the arc wall and the door window; cross section transformation processing; adjusting the parameter domain of the side surface; constructing a straight-grained surface body; and checking the door and window body validity, returning a model generation result and the like. The invention realizes the function of modeling the special-shaped doors and windows on the accurate and parameterized arc wall, improves the geometric modeling capability of computer aided design software, and can better meet the personalized and intelligent requirements in the field of building engineering.
Description
Technical Field
The invention belongs to the technical field of computer graphics and computer aided design, and particularly relates to a method for generating a special-shaped door and window model on a circular arc wall, which can be applied to the engineering quantity calculation and BIM model establishment of construction engineering cost.
Background
The modern building has unique modeling and complex structure, the design and processing difficulty is increased due to the different surface forms, and the engineering construction difficulty is increased due to the special space modeling. The complex special-shaped building model can bear more information, the traditional two-dimensional building CAD software cannot meet the requirements, and the BIM technology can solve the difficult problems encountered in the special-shaped building.
The BIM technology in the field of constructional engineering is developed rapidly, real information of a building is simulated by using a three-dimensional digital technology, and the BIM technology is widely applied to the full life cycle of engineering projects. At present, the mainstream cost software adopts a three-dimensional graph computation mode, namely, the intelligent computation of engineering is realized by firstly establishing a three-dimensional model and then computing the engineering quantity. The unique shape and structure of modern buildings have high requirements on geometric modeling capability. For the customized modeling of the special-shaped door and window on the arc wall, because the geometric shape requirement is special, the common modeling means is difficult to meet the requirement, so a general modeling mode is mostly adopted for approximate processing, the precision is lost, and the calculation amount difference is brought.
Disclosure of Invention
The invention provides an accurate and parameterized modeling method for realizing the modeling of special-shaped doors and windows on a circular arc wall based on a boundary representation model. The existing BIM modeling platform can provide basic curve surface representation, including curve types such as straight lines, circular arcs, elliptic arcs, spline curves and equidistant lines, and surface types such as planes, cylindrical surfaces, conical surfaces, spline surfaces and ruled surfaces, and provides a geometric model representation function based on a boundary representation method (BREP). On the basis, the invention adopts the following technical scheme.
The method for generating the special-shaped door and window model on the arc wall is used for generating the special-shaped door and window model on the arc wall according to input parameters, wherein the input parameters comprise the given arc wall shape, the special-shaped door and window section shape and the placement position information of the special-shaped door and window on the arc wall, and the method comprises the following steps of:
checking input parameter validity;
checking whether the input object pointer is a null pointer, whether the numerical value type is in an effective range, whether a local coordinate system is a right-handed orthogonal coordinate system, and whether a geometric object is legal;
if the input object pointer is not a null pointer, the numerical type is in the effective range, the local coordinate system is a right-hand orthogonal coordinate system and the geometric object is legal, the input parameter validity check is passed, and the second step is executed; otherwise, the input parameter does not pass the validity check, and an error code and corresponding error prompt information are returned;
secondly, according to the input bottom axis of the circular arc wall, the thickness from the curve to the left side of the wall surface and the thickness of the wall, the curve is converted at equal intervals to generate a side line of the circular arc wall;
thirdly, generating a side surface curved surface-cylindrical surface of the arc wall according to the side line of the arc wall generated in the second step and the local coordinate system; calculating the position of the door and window section in the curved surface parameter space of the side surface of the circular arc wall according to the original point of the door and window section coordinate system and the door and window section position identification, and translating and converting the polygon of the door and window section to the position, namely determining the position relation of the circular arc wall and the door and window;
step four, section transformation processing;
according to the space shape requirement of the special-shaped door and window, corresponding points on two side surfaces of the door and window are the same in the vertical direction, namely Z-direction coordinate values of a local coordinate system, and meet perspective projection transformation in a horizontal plane, namely XY-direction coordinate values of the local coordinate system, wherein the projection center is a point on the central shaft of the circular arc wall surface;
step five, adjusting the parameter domain of the side surface curved surface;
adjusting the parameter domain of the side surface curved surface of the arc wall to enable the section of the door and the window to be positioned in the single period parameter domain;
step six, constructing a ruled surface body;
the structure of the ruled surface body is realized through the structure auxiliary class of a geometric entity of a boundary representation method (BREP), namely the end surface is an isomorphic curved surface, and the side surface is a ruled surface; constructing a generated boundary representation entity, namely a special-shaped door and window model on the circular arc wall;
seventhly, checking the validity of the door and window body, and returning a model generation result;
releasing temporary objects and resources; and carrying out validity check on the finally generated special-shaped door and window body model on the arc wall, and returning the result of the generated model to the user.
Preferably, whether the geometric object is legal in the step one includes: whether the door and window section is end-to-end connected and is closed, whether the topology is complete, and whether the section sideline is self-crossed.
Preferably, the second step further includes checking whether the arc radius of the side edge is legal, and if there is a degradation on the side of the arc wall or an error in which the arc curves are equally spaced and reversed, returning an error code and a corresponding error prompt message.
Preferably, in the fourth step, the property that the NURBS curve still has invariance in perspective projection is utilized, the door and window section curve is converted into a straight line or a NURBS curve, and the shape transformation processing of the door and window section is realized by applying matrix transformation.
Preferably, the method for representing the entity filling body by the boundary comprises the following steps:
adding a starting end face, a terminating end face and a side face;
adding a starting end face edge, a terminating end face edge and a side face edge;
and checking the validity of the body.
Preferably, the method for adding the end face by the boundary representation entity comprises the following steps:
acquiring an end surface section and an end surface curved surface;
adding a topological surface to the boundary representation body;
and defining a cutting ring of the topological surface according to the parameter space section.
Preferably, the method for adding the side face by the boundary representation entity comprises the following steps:
step B1, acquiring the sections of the starting end face and the ending end face;
b2, judging whether the current ring edge index is less than the number of ring edges, if so, executing the step B3; if not, adding the side faces is finished;
step B3, acquiring a current ring edge object;
b4, acquiring a ring edge object of a corresponding end;
b5, generating a ruled surface curved surface;
b6, adding a topological surface to the boundary representation body;
and step B7, adding one to the current ring edge index, and returning to the step B2.
Through the technical scheme, the invention has the following beneficial effects:
the modeling function of the special-shaped door and window on the accurate and parameterized arc wall is realized, the geometric modeling capability of computer aided design software is improved, and the personalized and intelligent requirements in the field of building engineering are better met.
Drawings
FIG. 1 is a flow chart of the molding of shaped doors and windows
FIG. 2 is a flow chart of filling of boundary representation entities
FIG. 3 is a flow chart of adding an end face to a boundary representation entity
FIG. 4 is a flow chart of adding sides to a boundary representation entity
FIG. 5 is a diamond window and door on a circular wall
FIG. 6 is a view of a drop-shaped window or door on a circular arc wall
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, defining a user-friendly modeling interface to realize the modeling (modeling) function of the special-shaped doors and windows on the arc wall. Based on the geometric curve surface type provided by the existing modeling platform (such as ACIS, parasolid and the like), and other data structure definitions, the service scene is abstracted, and the interface calling usability is considered, the interface input parameters comprise information such as the shape of a given arc wall, the section shape of a special-shaped door and window, the placement position of the special-shaped door and window on the arc wall and the like. For example, using C + + code as follows.
/*！
* Special-shaped door and window on @ brief structure arc wall
* @ param [ in ] const ccoordinations 3d & cordinate local coordinate system
* Curve of circular arc wall of @ param [ in ] const CArc2d pArc2d
* Thickness from @ param [ in ] double d LeftWidth curve to left side of wall surface
* Thickness of @ param [ in ] double dWallWidth wall
* @ param [ in ] const CPolygon pWindow section on the wall surface marked by nFlag (expansion of door and window shape on the cylindrical wall surface)
* The origin of the @ param [ in ] const CVchoice 3d & ptInsert door and window cross-section coordinate system (the origin must be on the wall surface identified by nFlag, the X direction is the tangent of the corresponding circular curve at the point, the Y direction is the Z direction of the local coordinate system)
* The @ param [ in ] int nFlag door and window section position identification: 1-door and window section is positioned on the left wall surface, and 0-door and window section is positioned on the axis of the wall surface
* @ return CBody door and window body
*/
CBody*WindowBody(const CCoordinates3d&coordinate,const CArc2d*pArc2d,double dLeftWidth,double dWallWidth,
const CPolygon*pWindow,const CVector3d&ptInsert,int nFlag)；
A flowchart of the method for generating the special-shaped door and window model of the embodiment is shown in fig. 1. Fig. 2, fig. 3, and fig. 4 respectively show a filling body flow chart, a boundary representation entity adding end face flow chart, and a boundary representation entity adding side face flow chart of the boundary representation entity. The model generation steps of the present embodiment are described in conjunction with the above flowchart as follows:
step one, input parameter validity check
The user API interface first needs to check whether the input object pointer is a null pointer, whether the numerical type is within a valid range, whether the local coordinate system is a right-handed orthogonal coordinate system, and whether the geometric object is legal (e.g., whether the door and window sections are end-to-end and closed, whether the topology is complete, and whether the section edges are self-intersected). If the validity check is not passed, an error code and corresponding error prompt information are returned.
Step two, the circular arc wall curves are equidistant
And according to the input axis of the bottom surface of the circular arc wall, the thickness from the curve to the left side of the wall surface and the thickness of the wall, the curve is converted at equal intervals to generate a side sideline of the circular arc wall. And checking whether the arc radius of the side sideline is legal, and returning an error code and corresponding error prompt information if the side of the arc wall has degradation or an error of equidistant reversal of the arc curve.
Step three, generating a side surface curved surface and a cross section
And generating a side surface curved surface-cylindrical surface of the arc wall according to the side line of the arc wall generated in the step two and the local coordinate system. According to the original point of the door and window section coordinate system and the door and window section position identification, calculating the position (two-dimensional coordinate point) of the door and window section in the curved surface parameter space of the side surface of the circular arc wall, translating and transforming the polygon of the door and window section to the position, and determining the position relation of the circular arc wall and the door and window.
Step four, section conversion treatment
According to the space shape requirement of the special-shaped door and window, the coordinate values of corresponding points on two side surfaces of the door and window in the vertical direction (Z direction of a local coordinate system) are the same, the coordinate values in the horizontal plane (XY direction of the local coordinate system) meet the perspective projection transformation, and the projection center is a point on the central shaft of the circular arc wall surface. The NURBS curve has affine invariance, namely affine transformation is applied to the curve through transformation of control points, the important property that the NURBS curve still has invariance under perspective projection is utilized, the curve of the section of the door and the window is converted into a straight line or the NURBS curve, and the shape transformation processing of the section of the door and the window can be realized by applying matrix transformation.
Step five, adjusting the parameter domain of the side surface
And adjusting the parameter domain of the side surface curved surface of the arc wall to ensure that the section of the door and the window is positioned in the single period parameter domain.
The angle of a circle is 2 pi so the full circle angle is 0,2 pi, but the circle is periodic and can also be expressed as 2 pi, 4 pi, etc. The single period parameter domain means that it is in the [0,2 π ] range, rather than existing across 2 π being divided into two segments, i.e.: the arc angle of the section of the door and window is in the range of [0,2 pi ].
Step six, constructing a ruled surface body
The structure of the ruled surface body is realized through the structure auxiliary class of the geometric solid of the Boundary Representation (BREP), namely the end surface is an isomorphic curved surface (an arc wall cylindrical surface with the shape of the section of a door and a window), and the side surface is a ruled surface.
Referring to fig. 2, the filling process of the boundary representation entity is as follows:
step 1, adding an initial end face;
step 2, adding a termination end face;
step 3, adding a side face;
step 4, adding an initial end face edge;
step 5, adding a termination end face edge;
step 6, adding a side edge;
step 7, checking the validity of the body;
step 8 returns the boundary representation.
The specific flow of adding the end face is shown in fig. 3, and includes:
step A1, acquiring an end surface section (curved surface parameter space);
step A2, obtaining an end surface curved surface;
step A3, adding a topological surface to the boundary representation body;
and A4, defining a cutting ring of the topological surface according to the parameter space section.
Referring to fig. 4, a specific flow of adding a side is as follows:
step B1, acquiring the sections (curved surface parameter space) of the starting end surface and the ending end surface;
b2, judging whether the current ring edge index is smaller than the ring edge number, if so, executing the step B3; if not, adding the side faces is finished;
step B3, acquiring a current ring edge object;
b4, acquiring a ring edge object of a corresponding end;
b5, generating a ruled surface curved surface;
step B6, adding a topological surface to the boundary representation body;
and step B7, adding one to the current ring edge index, and returning to the step B2.
Method step
And constructing the generated boundary representation entity, namely the special-shaped door and window entity object on the arc wall.
Constructing an auxiliary class may be implemented, for example, by the following code.
Seventhly, checking the validity of the door and window body and returning a modeling result
And releasing the temporary objects and resources. And carrying out validity check on the finally generated special-shaped door and window bodies on the arc wall, and returning the modeling result to the user.
The method for generating the special-shaped door and window model on the arc wall can be packaged into an interface function for being called by a user,
for example, as follows.
Step A, generating a right-hand orthogonal coordinate system object which is a local coordinate system of the bottom surface axis of the circular arc wall
Step B, constructing a two-dimensional arc object which is an axis of the bottom surface of the arc wall
Step C, constructing the polygonal object with the special-shaped door and window section
Step D, defining building entity object constructor, calling the above-mentioned interface function and inputting the object constructed in the steps A, B and C and proper parameter
And E, acquiring an interface calling return value, and performing subsequent processing.
The three-dimensional solid model of the special-shaped doors and windows on the arc wall is shown in fig. 5 and 6, wherein typical examples of the three-dimensional solid model are rhombic doors and windows and drop-shaped doors and windows.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
Claims (8)
1. A method for generating a special-shaped door and window model on an arc wall is used for generating the special-shaped door and window model on the arc wall according to input parameters, and is characterized in that:
the method comprises the following steps:
step one, inputting parameter validity check;
checking whether the input object pointer is a null pointer, whether the numerical type is in an effective range, whether a local coordinate system is a right-hand orthogonal coordinate system, and whether a geometric object is legal;
if the input object pointer is not a null pointer, the numerical type is in the effective range, the local coordinate system is a right-hand orthogonal coordinate system and the geometric object is legal, the input parameter validity check is passed, and the second step is executed; otherwise, the input parameter does not pass the validity check, and an error code and corresponding error prompt information are returned;
step two, according to the input bottom axis of the circular arc wall, the thickness from the curve to the left side of the wall surface and the thickness of the wall, the curve is converted at equal intervals to generate a side edge line of the circular arc wall;
thirdly, generating a side surface curved surface-cylindrical surface of the arc wall according to the side line of the arc wall generated in the second step and the local coordinate system; calculating the position of the door and window section in the curved surface parameter space of the side surface of the arc wall according to the origin of the door and window section coordinate system and the door and window section position identification, and translating and converting the polygon of the door and window section to the position, namely determining the position relation of the arc wall and the door and window;
step four, section transformation processing;
according to the space shape requirement of the special-shaped door and window, corresponding points on two side surfaces of the door and window are the same in the vertical direction, namely Z-direction coordinate values of a local coordinate system, and meet perspective projection transformation in a horizontal plane, namely XY-direction coordinate values of the local coordinate system, wherein the projection center is a point on the central shaft of the circular arc wall surface;
step five, adjusting the parameter domain of the side surface curved surface;
adjusting the parameter domain of the side surface curved surface of the arc wall to ensure that the section of the door and the window is positioned in the parameter domain of a single period, namely: the arc angle of the section of the door and the window is in the range of [0,2 pi ];
step six, constructing a ruled surface body;
the method comprises the steps of realizing the structure of a ruled surface body by a structure auxiliary class of a geometric solid of a boundary representation method (BREP), namely, the end surface is an isomorphic curved surface, and the side surface is a ruled surface; constructing a generated boundary representation entity, namely a special-shaped door and window model on the circular arc wall;
seventhly, checking the validity of the door and window body, and returning a model generation result;
releasing temporary objects and resources; and carrying out validity check on the finally generated arc wall special-shaped door and window body model, and returning the result of generating the model to the user.
2. The method for generating the special-shaped door and window model on the arc wall according to claim 1, characterized in that:
the step one of judging whether the geometric object is legal or not comprises the following steps: whether the door and window section is end-to-end connected and is closed, whether the topology is complete, and whether the section sideline is self-crossed.
3. The method for generating the special-shaped door and window model on the arc wall as claimed in claim 1, wherein the method comprises the following steps:
and step two, checking whether the arc radius of the side edge line is legal or not, and returning an error code and corresponding error prompt information if the side surface of the arc wall has degradation or the arc curve has equidistance and reverse errors.
4. The method for generating the special-shaped door and window model on the arc wall according to claim 1, characterized in that:
and in the fourth step, the property that the NURBS curve still has invariance under perspective projection is utilized, the door and window section curve is converted into a straight line or the NURBS curve, and the shape transformation processing of the door and window section is realized by applying matrix transformation.
5. The method for generating the special-shaped door and window model on the arc wall according to claim 1, characterized in that:
the method for representing the entity filling body by the boundary comprises the following steps:
adding a starting end face, a terminating end face and a side face;
adding a starting end face edge, a terminating end face edge and a side face edge;
and checking the validity of the body.
6. The method for generating the special-shaped door and window model on the arc wall according to claim 1, characterized in that:
the method for adding the end face by the boundary representation entity comprises the following steps:
acquiring an end surface section and an end surface curved surface;
adding a topological surface to the boundary representation body;
and defining a cutting ring of the topological surface according to the parameter space section.
7. The method for generating the special-shaped door and window model on the arc wall as claimed in claim 1, wherein the method comprises the following steps:
the method for adding the side face to the boundary representation entity comprises the following steps:
step B1, obtaining the sections of the starting end face and the ending end face;
b2, judging whether the current ring edge index is smaller than the ring edge number, if so, executing the step B3; if not, adding the side faces is finished;
step B3, acquiring a current ring edge object;
b4, acquiring a ring edge object of a corresponding end;
b5, generating a ruled surface curved surface;
b6, adding a topological surface to the boundary representation body;
and step B7, adding one to the current ring edge index, and returning to the step B2.
8. The method for generating the special-shaped door and window model on the arc wall as claimed in claim 1, wherein the method comprises the following steps:
the input parameters comprise the given arc wall shape, the section shape of the special-shaped door and window and the placement position information of the special-shaped door and window on the arc wall.
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| CN101320486A (en) * | 2008-07-16 | 2008-12-10 | 永凯软件技术（上海）有限公司 | Curved body three-dimensional boundary representation model reconstruction method and device based on line boundary |
| CN107424193A (en) * | 2017-04-27 | 2017-12-01 | 巧夺天宫（深圳）科技有限公司 | A kind of door and window information extracting method and its device |
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| CN101320486A (en) * | 2008-07-16 | 2008-12-10 | 永凯软件技术（上海）有限公司 | Curved body three-dimensional boundary representation model reconstruction method and device based on line boundary |
| CN107424193A (en) * | 2017-04-27 | 2017-12-01 | 巧夺天宫（深圳）科技有限公司 | A kind of door and window information extracting method and its device |
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