CN111724476A - Dynamo and Python-based rapid modeling method for special-shaped bridge pier - Google Patents
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Abstract
A rapid modeling method for a special-shaped bridge pier based on Dynamo and Python is characterized by comprising the following steps: it comprises the following steps: (1) the method comprises the steps of compiling Python codes by utilizing Python script nodes of Dynamo, wherein the Python codes are obtained by establishing a space rectangular coordinate system according to a special-shaped pier design drawing and expressing a contour curve of the special-shaped pier in the vertical direction by utilizing a piecewise function; (2) assigning values to variables defined in the Python script, and acquiring a plurality of cross section profiles; (3) utilizing the Solid ByLoft node to loft the obtained cross section to create a special-shaped pier entity; (4) and outputting the Dynamo model to Revit by utilizing an import instance ByGeometry node. The method has the advantages of simpler procedure and higher modeling efficiency.
Description
Technical Field
The invention relates to the technical field of modeling of special-shaped components, in particular to a Dynamo and Python-based quick modeling method for a special-shaped pier.
Background
The BIM (building Information modeling) technology is a visual digital building model constructed based on an advanced three-dimensional digital design solution, is applied to each stage of bridges, tunnels and building engineering, and can realize rapid modeling, model calculation, drawing output, engineering quantity statistics, collaborative design, digital Information construction, construction simulation and the like. Dynamo is an efficient computer aided design tool in parameterized building design software, and is an open-source plug-in based on an Autodesk Dynamo information management platform. A set of progressive program flow is set at a predefined node connected with a working interface aiming at a certain problem through a computational design method and a visual programming language, and the problem is solved through basic logic of input, processing and output.
At present, the informatization degree of the building industry is still lagged behind, the appearance of visual programming such as Dynamo and the like only promotes and optimizes a modeling means to a certain degree, however, when Dynamo is used to a certain depth, too many nodes can be found, the management is inconvenient, and some functions cannot be realized by using the nodes. Thus, the mere use of Dynamo has in fact presented a number of limitations. Python is a cross-platform computer programming language, is a high-level scripting language combining interpretability, compiling performance, interactivity and object-oriented, can realize the functions of nodes, can introduce a third-party function, greatly improves the convenience of parametric design, and is widely applied to the aspects of Web development, scientific calculation and statistics, artificial intelligence, software development, back-end development, network crawlers and the like. Therefore, the introduction of Python programming into Dynamo makes the program more concise and the modeling efficiency higher, and a rapid modeling method based on Dynamo and Python is not designed for the special-shaped bridge pier at present.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the Dynamo and Python-based abnormal pier rapid modeling method is simpler in program and higher in modeling efficiency.
The technical solution of the invention is as follows: a rapid modeling method for a special-shaped bridge pier based on Dynamo and Python is characterized by comprising the following steps: it comprises the following steps:
(1) the method comprises the steps of compiling Python codes by utilizing Python script nodes of Dynamo, wherein the Python codes are obtained by establishing a space rectangular coordinate system according to a special-shaped pier design drawing, expressing a contour curve of the special-shaped pier in the vertical direction by utilizing a piecewise function and calculating the relative position relation between the contour curves;
(2) inputting related parameters of the special-shaped bridge pier by using the corresponding nodes of Dynamo to assign values to variables defined in the Python script,
simultaneously, according to the profile curves obtained in the step (1) and the relative position relationship between the profile curves, points are taken at equal intervals along the height direction, coordinates of each point on the cross section are obtained, and the points at the same height are connected to obtain a plurality of cross section profiles;
(3) setting out the obtained cross section by using Solid ByLoft nodes in Dynamo to create a special-shaped pier entity;
(4) and outputting the Dynamo model to the Revit by utilizing an import instance ByGeometry node in Dynamo.
After the method is adopted, the invention has the following advantages:
the rapid modeling method of the special-shaped bridge pier based on Dynamo and Python adopts Python script programming to replace a complex operational logic relationship formed by Dynamo nodes aiming at a piecewise function of a contour curve representing the vertical direction of the special-shaped bridge pier, can greatly simplify the program and has higher modeling efficiency, and the Python script is adopted to facilitate the adjustment and control of parameters, almost all the parameters are variable, the parameter modification is more flexible and convenient, and only the relevant parameters of the Python script are changed, not only can realize the batch modeling of the same special-shaped bridge pier and change the related function of the Python script, but also can realize the batch modeling of different types of special-shaped bridge piers, further improves the modeling efficiency, in addition, aiming at other relatively simple operational logic relations, Dynamo nodes are adopted, so that the programming difficulty is low, the operation is more convenient, the visualization is well realized, and the modeling efficiency is further improved.
Preferably, the following steps are further included between the step (2) and the step (3): the cross-sectional profile is processed using the polycurvefill node of Dynamo to obtain an accurate cross-sectional profile. This arrangement can make the established Dynamo model more accurate.
Preferably, the front face and the rear face of the special-shaped pier are planes, a space rectangular coordinate system is established according to a special-shaped pier design drawing, and the method is simplified to establish two plane rectangular coordinate systems on the front face and the rear face of the special-shaped pier. The special-shaped bridge pier with the planar front face and the planar rear face can be simplified into a planar rectangular coordinate system by the aid of the special-shaped bridge pier, so that subsequent procedures are further simplified, and modeling efficiency is further improved.
Preferably, the piecewise function of the contour curve representing the vertical direction of the irregular pier comprises a lower straight line segment and an upper curved line segment. The setting can simplify the piecewise function, further simplify the whole program and improve the modeling efficiency.
Preferably, in the step (2), when points are taken at equal intervals in the height direction according to the already obtained profile curve and the relative position relationship between the profile curves, the interval is an adjustable parameter. This setting can control the model accuracy.
Description of the drawings:
FIG. 1 is an interface of a Python script node according to the present invention;
FIG. 2 is a Python code editing page of the present invention;
FIG. 3 is a parameter input interface according to the present invention;
FIG. 4 is a diagram of the present invention of the operational logic relationship for generating coordinates of points on a cross-section using nodes;
FIG. 5 is a coordinate display of points on a cross-section of the present invention;
FIG. 6 is an interface of a PolyCurve fill node of the present invention;
FIG. 7 is a diagram of the operational logic relationship of the present invention using PolyCurve fill nodes for processing;
FIG. 8 is a rough cross-sectional profile without the PolyCurve fill node process;
FIG. 9 is a precise cross-sectional profile using a PolyCurve fill node process;
FIG. 10 is an interface of Solid ByLoft nodes;
FIG. 11 is a logical relationship diagram of the operations performed by the Solid ByLoft nodes;
fig. 12 is the Dynamo model after lofting;
FIG. 13 is an interface of an import instance ByGeometry node;
fig. 14 is the model output to Revit.
Detailed Description
The invention is further described with reference to the following embodiments in conjunction with the accompanying drawings.
Example (b):
a rapid modeling method for a special-shaped bridge pier based on Dynamo and Python comprises the following steps:
(1) as shown in fig. 1 and fig. 2, Python codes are compiled by using Python script nodes of Dynamo, the Python codes are a space rectangular coordinate system established according to a special-shaped pier design drawing, profile curves in the vertical direction of the special-shaped pier are represented by using a piecewise function, and a relative position relationship between the profile curves is calculated, in this embodiment, front and back surfaces of the special-shaped pier are planes, so the space rectangular coordinate system is established according to the special-shaped pier design drawing, two plane rectangular coordinate systems are simplified to be established on the front and back surfaces of the special-shaped pier, so that 2 outer profile curves on the front and back surfaces can be used for representing outer profiles, since the middle part of the special-shaped pier is concave, 4 inner profile curves on the front and back surfaces are needed to represent inner profiles, wherein the 2 inner profile curves and the 2 outer profile curves on the same plane, the same rectangular coordinate system can be used, although the other 2 inner contour curves are not in the same plane as the 2 outer contour curves on the corresponding side, the other 2 inner contour curves can be obtained by translating the 2 inner contour curves on the same plane as the outer contour curves on the same side, so that an additional plane rectangular coordinate system does not need to be re-established, and therefore 12 contour curves are required in total for a complete special-shaped pier in the embodiment, only two front and rear plane rectangular coordinate systems are adopted, the piecewise function of the contour curves representing the vertical direction of the special-shaped pier comprises a lower straight line segment and an upper curved line segment, the relative position relationship between the calculated contour curves in the embodiment comprises the distance between the two symmetrical outer contour curves on the same plane, the distance between the inner contour curves and the like, the calculated cross-section outer contour distance in the section width and length part, the calculated cross-section inner contour distance, Calculating the transverse length of the cross section, wherein the 3 node frames are all compiled by Python scripts;
(2) as shown in fig. 3, inputting relevant parameters of the special-shaped bridge pier to assign values to variables defined in a Python script by using corresponding nodes of Dynamo, as shown in fig. 3 and 4, simultaneously, according to the profile curve obtained in the step (1) and the relative position relationship between the profile curves, taking points at equal intervals along the height direction, namely, cutting the special-shaped bridge pier at intervals of a horizontal plane to obtain intersection points of the horizontal plane and the profile curve of the bridge pier, namely obtaining coordinates of each point on the cross section, wherein each point on the cross section is shown in fig. 5, connecting the points at the same height to obtain a plurality of cross section profiles, wherein the cross section profiles are rough profiles, the intervals are adjustable parameters, and the accuracy of the models can be controlled;
(3) as shown in fig. 6 and 7, processing the cross-sectional profile by using a PolyCurve filler node of Dynamo to obtain a precise cross-sectional profile, wherein the processing process includes chamfering and data reorganization, and comparing the processed precise cross-sectional profile with the rough cross-sectional profile obtained in step (2), as shown in fig. 8 and 9;
(4) as shown in fig. 10 and 11, lofting the obtained cross section by using the Solid bylot node in Dynamo to create a special-shaped pier entity, wherein the lofted special-shaped pier entity is shown in fig. 12;
(5) as shown in fig. 13, using the importstance ByGeometry node in Dynamo, the Dynamo model is output to Revit, and the model output to Revit is shown in fig. 14.
The rapid modeling method of the special-shaped bridge pier based on Dynamo and Python adopts Python script programming to replace a complex operational logic relationship formed by Dynamo nodes aiming at a piecewise function of a contour curve representing the vertical direction of the special-shaped bridge pier, can greatly simplify the program and has higher modeling efficiency, and the Python script is adopted to facilitate the adjustment and control of parameters, almost all the parameters are variable, the parameter modification is more flexible and convenient, and only the relevant parameters of the Python script are changed, not only can realize the batch modeling of the same special-shaped bridge pier and change the related function of the Python script, but also can realize the batch modeling of different types of special-shaped bridge piers, further improves the modeling efficiency, in addition, aiming at other relatively simple operational logic relations, Dynamo nodes are adopted, so that the programming difficulty is low, the operation is more convenient, the visualization is well realized, and the modeling efficiency is further improved.
Claims (5)
1. A rapid modeling method for a special-shaped bridge pier based on Dynamo and Python is characterized by comprising the following steps: it comprises the following steps:
(1) the method comprises the steps of compiling Python codes by utilizing Python script nodes of Dynamo, wherein the Python codes are obtained by establishing a space rectangular coordinate system according to a special-shaped pier design drawing, expressing a contour curve of the special-shaped pier in the vertical direction by utilizing a piecewise function and calculating the relative position relation between the contour curves;
(2) inputting relevant parameters of the special-shaped bridge pier to assign values to variables defined in the Python script by using corresponding nodes of Dynamo, and meanwhile, according to the profile curve obtained in the step (1) and the relative position relation between the profile curves, taking points at equal intervals in the height direction, obtaining coordinates of each point on the cross section, and connecting the points at the same height to obtain a plurality of cross section profiles;
(3) setting out the obtained cross section by using Solid ByLoft nodes in Dynamo to create a special-shaped pier entity;
(4) and outputting the Dynamo model to the Revit by utilizing an import instance ByGeometry node in Dynamo.
2. The Dynamo and Python-based special-shaped bridge pier rapid modeling method according to claim 1, wherein the method comprises the following steps: the method also comprises the following steps between the step (2) and the step (3): the cross-sectional profile is processed using the PolyCurve fill node of Dynamo to obtain an accurate cross-sectional profile.
3. The Dynamo and Python-based special-shaped bridge pier rapid modeling method according to claim 1, wherein the method comprises the following steps: the front face and the rear face of the special-shaped bridge pier are planes, a space rectangular coordinate system is established according to a special-shaped bridge pier design drawing, and the space rectangular coordinate system is simplified to be established in the front face and the rear face of the special-shaped bridge pier.
4. The Dynamo and Python-based special-shaped bridge pier rapid modeling method according to claim 1, wherein the method comprises the following steps: the piecewise function of the contour curve representing the vertical direction of the irregular pier comprises a lower straight line segment and an upper curved line segment.
5. The Dynamo and Python-based special-shaped bridge pier rapid modeling method according to claim 1, wherein the method comprises the following steps: in the step (2), when points are taken at equal intervals in the height direction according to the obtained profile curves and the relative position relationship between the profile curves, the intervals are adjustable parameters.
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| CN114357576A (en) * | 2021-12-24 | 2022-04-15 | 宁波市政工程建设集团股份有限公司 | Revit and Dynamo variable-section bridge railing column-based creating method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113470178A (en) * | 2020-12-15 | 2021-10-01 | 北京构力科技有限公司 | Method for generating three-dimensional building model, electronic device and storage medium |
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| CN114357576A (en) * | 2021-12-24 | 2022-04-15 | 宁波市政工程建设集团股份有限公司 | Revit and Dynamo variable-section bridge railing column-based creating method |
| CN114357576B (en) * | 2021-12-24 | 2024-04-26 | 宁波市政工程建设集团股份有限公司 | Method for creating variable cross-section bridge Liang Langan upright post based on Revit and Dynamo |
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