CN105787493B - A method of based on BIM intelligent extraction setting-out characteristic point - Google Patents
A method of based on BIM intelligent extraction setting-out characteristic point Download PDFInfo
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- CN105787493B CN105787493B CN201610097474.1A CN201610097474A CN105787493B CN 105787493 B CN105787493 B CN 105787493B CN 201610097474 A CN201610097474 A CN 201610097474A CN 105787493 B CN105787493 B CN 105787493B
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- G—PHYSICS
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/42—Global feature extraction by analysis of the whole pattern, e.g. using frequency domain transformations or autocorrelation
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The present invention provides a kind of method based on BIM intelligent extraction setting-out characteristic point, and implement according to the following steps: step 1 chooses any BIM model to be highlighted；Step 2, the coordinate value (Xi, Yi, Zi) for obtaining the vertex of the normal and all triangular facets of composition of all triangular facets in selected BIM model；Whether in the same plane step 3 judges adjacent two triangular facets for having common edge, and newly-built recording surface saves coplanar triangular facet, successively traverses all triangular facets, and coplanar triangular facet is stored in respectively in corresponding recording surface；Step 4, judge recording surface shape whether be it is round, if circle take the center of circle be the model characteristic point, otherwise take the vertex of the model to be characterized a little.The present invention is suitable for being based on BIM model intelligent extraction setting-out characteristic point, can simplify the complex operations of the prior art, and then increase substantially construction lofting efficiency, is finally reached and reduces construction time and cost while guaranteeing construction quality.
Description
Technical field
The invention belongs to computer application field more particularly to a kind of methods based on BIM intelligent extraction characteristic point.
Background technique
Traditional construction setting-out generally at least needs three professional technicians to carry out the determination to layout point, layout point coordinate
Calculating and complete a series of activities such as setting-out using measuring device, this setting out method certainly will lead to that amount of calculation is big, puts
The problems such as sample speed is slow, precision is low, and Topcon LN-100 laser tacheometer can solve very well traditional setting-out it is existing these
Problem, but software matched with its is substantially based on 2-D data and carries out construction lofting.Although Topcon LN-100 with
BIM 360Layout App is combined and has been filled up the construction lofting white space based on three-dimensional data, but BIM 360Layout App
Cloud service development is based on by offshore company Autodesk, external server implementation behaviour is based on for some domestic concerning security matters sensitive datas
Work has certain limitation.In addition, BIM 360Layout App carries out conventional put directly extracting setting-out characteristic point using BIM
Sample process is: creation and management BIM model (being typically based on Revit) → based on professional software create characteristic point in a model
→ BIM model and characteristic point are imported in BIM 360Layout App → completes to put with live sharing feature point → using equipment
Sample；This procedure extraction setting-out characteristic point needs to create characteristic point on model based on professional software, and then characteristic point is led
Enter, finally characteristic point is imported into APP, this mode will definitely increase construction time and cost, while be also required to be familiar with special
The professional of industry modeling software operates, and virtually makes complicated for operationization, while also reducing setting-out efficiency.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is be prior art there are aiming at the problem that, provide a kind of based on BIM
Intelligent extraction setting-out feature point methods, overcome tradition extraction setting-out characteristic point time-consuming and then caused setting-out is time-consuming, it is a large amount of to occupy
Labour, it is with high costs the problems such as and simplify the complex operations of the prior art, realize intelligent setting-out characteristic point, increase substantially
Construction lofting efficiency, and layman is made also to be able to carry out accurate construction lofting, while being finally reached guarantee construction quality
Reduce construction time and cost.
To achieve the above object, the present invention takes following technical scheme:
A method of based on BIM intelligent extraction setting-out characteristic point, this method comprises the following steps:
(1) any BIM model is chosen to be highlighted；
(2) coordinate value of the normal of all triangular facets and the vertex for forming all triangular facets in selected BIM model is obtained
(Xi, Yi, Zi)；
(3) whether in the same plane to judge adjacent two triangular facets for having common edge, it is coplanar to create recording surface preservation
Triangular facet, successively traverse all triangular facets, coplanar triangular facet be stored in respectively in corresponding recording surface；
(4) judge recording surface shape whether be it is round, if circle take the center of circle be the model characteristic point, otherwise take the top of the model
Point is characterized a little.
In above scheme, it is the title and number etc. for needing to read BIM model in APP in the step (1), then establishes
With the real time correlation of BIM model in APP, finally when in APP BIM model by click i.e. there is button trigger event after just to this
Model is highlighted.
It is the spy being typically made of triangular facet or four edged surfaces according to BIM model in above scheme, in the step (2)
Sign, the coordinate value (Xi, Yi, Zi) on the vertex of the normal and all triangular facets of composition of available all triangular facets.
Be in above scheme, in the step (3) according to have common edge two triangular facets normal vector in parallel then this two
Whether in the same plane the coplanar principle of a triangular facet judges adjacent two triangular facets for having common edge, creates recording surface
Coplanar triangular facet is saved, all triangular facets are successively traversed, coplanar triangular facet is stored in respectively in corresponding recording surface.
It is identical according to the circumscribed circle center of circle of all triangular facets in same plane in above scheme, in the step (4)
The figure that then all triangular facets are constituted is that circle judges that recording surface shape is round, and taking the center of circle is the model characteristic point, is otherwise taken
The vertex of the model is the model characteristic point.
In above scheme, above step is carried out on backstage, only needs the movement of a simple click screen on foreground
To show the characteristic point of the model.
The invention adopts the above technical scheme, which has the following advantages:
User can click BIM model directly in App can obtain the characteristic point of the model automatically, without passing through profession
Modeling software extracts setting-out characteristic point, export characteristic point, imports a series of processes such as characteristic point in App, so that in BIM model
Upper extraction setting-out characteristic point is more intelligent, can obtain characteristic point on BIM without that can operate professional software, guarantee to apply
Working efficiency is also improved while work precision.
Detailed description of the invention
Fig. 1 is the embodiment flow chart of the method for the invention based on BIM intelligence setting-out characteristic point；
Fig. 2 is the flow chart of step S2 in the method for the invention based on BIM intelligent extraction setting-out characteristic point；
Fig. 3 is BIM model 2 d plane picture used in illustrative example of the present invention；
Fig. 4 is the 2 d plane picture that BIM model is showed used in illustrative example of the present invention with triangular facet；
Fig. 5 is that the recording surface in BIM model used in illustrative example of the present invention is round side view；
Fig. 6 is that in BIM model used in illustrative example of the present invention and road surface is round front view；
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the embodiment of the present invention provides a kind of method based on BIM intelligent extraction setting-out characteristic point, it is to put
After clicking any BIM model assembly on the basis of existing BIM model in sample APP, program automatic lofting characteristic point, specific steps
Include the following:
S1, any BIM model is chosen to be highlighted.
The present invention is operated to the BIM model imported in setting-out APP system, it is necessary first to be read in APP in real time
Title and number of BIM model etc., then establish with APP in BIM model real time correlation, finally when in APP BIM model by
It clicks and just this model is highlighted after there is button trigger event.
S2, the coordinate value for obtaining the vertex of the normal and all triangular facets of composition of all triangular facets in selected BIM model
(Xi, Yi, Zi)。
In the application one in the specific implementation, referring to Fig. 2, the step S2 includes:
S21, BIM model change into triangular facet.
It is illustrated by taking metope BIM as an example in this step, referring to Fig. 3, shown in Fig. 4, other BIM models are similar.In order to just
Coplanar problem is judged in step S3 and 3 points by being not arranged on the same straight line certain coplanar and four points not necessarily
Coplanar principle, needing that BIM model is first changed into triangular facet BIM model is usually to be made of triangular facet or four edged surfaces, if mould
Type is that four edged surfaces composition can use wire frame mode and all change into triangular facet, does not otherwise need to carry out this step.
S22, following quantity, the quantity of normal vector are recorded.
The triangular facet of composition BIM model is substantially made of Points And lines, using program language record following quantity and
The quantity of normal vector.
S23, the two-dimensional array for establishing storage vertex of surface dough-kneading method vector.
S24, the quantity for obtaining vertex of surface and face.
S25, a vertex in first triangular facet of taking-up and its normal vector index, respectively obtain its coordinate value (Xv1,
Yv1, Zv1) and (Xf1, Yf1, Zf1)。
S26, the coordinate value (Xv that all vertex are obtained by traversing operationi, Yvi, Zvi) and triangular facet normal vector coordinate
It is worth (Xfi, Yfi, Zfi)。
S3, whether in the same plane to judge adjacent two triangular facets for having common edge, it is coplanar to create recording surface preservation
Triangular facet, successively traverse all triangular facets, coplanar triangular facet be stored in respectively in corresponding recording surface.
Judge whether two neighboring triangular facet is identical there are two apex coordinate value, and if the same the two triangular facets there are public affairs
Side is otherwise without common edge altogether.According to the normal vector of adjacent two triangular facets for having common edge(Xm, Ym, Zm) and(Xn, Yn,
Zn), it is determined whetherMake with the presence or absence of a non-zero constant λ:
(Xm, Ym, Zm)=λ (Xn, Yn, Zn)
It converts and namely whether meets following equation group:
If the coordinate value of the normal vector of adjacent two triangular facets for having common edge meets above equation group, illustrate the two
Normal vector is in parallelAnd then it can be concluded that the two adjacent triangular facets for having common edge are i.e. coplanar in the same plane.
After the triangular facet for having common edge when two adjacent is coplanar, creates recording surface and save coplanar triangular facet.Then after
Whether two coplanar triangular facets of continuous judgement other triangular facets adjacent thereto are coplanar, if coplanar, newly coplanar three
Edged surface is stored in built recording surface.All triangular facets are traversed in this way, and it is various to save to create multiple recording surfaces
Coplanar triangular facet.
S4, judge whether recording surface shape is round.Taking the center of circle if circle is the model characteristic point, otherwise takes the top of the model
Point is characterized a little.
It is coplanar according to the triangular facet in the characteristic recording surface of recording surface, therefore must in triangular facet apex coordinate value
Surely there is an identical value, assume that Zvi value is all identical in the present embodiment.It can read in all triangular facets in recording surface
The coordinate value (Xvi, Yvi, Zvi) on three vertex, compare Xvi, Yvi, Zvi in all triangular facet apex coordinate values which
A numerical value is the same numerical value.In the present embodiment, the two-dimensional coordinate (Xvi, Yvi) on all vertex can be taken out after comparing,
Then arbitrarily read a triangular facet three vertex, in the present embodiment it is assumed that (Xv1, Yv1), (Xv2, Yv2), (Xv3,
Yv3), the external equation of a circle of three vertex correspondences of the triangular facet is concurrently set are as follows:
(X-a)2+(Y-b)2=c
Wherein, a, b, c are unknown number, and (Xv1, Yv1), (Xv2, Yv2), (Xv3, Yv3) are substituted into the above equation side of obtaining
Journey group:
It solves above equation group and obtains a, the value of b, c, it is assumed that it is a0, b0, c0, the center of circle of circumscribed circle is (a0, b0) at this time,
Radius is c0, obtains external equation of a circle are as follows:
(X-a0)2+(Y-b0)2=c0
Wherein, a0, b0, c0 are constant herein.
Bring the vertex of other triangular facets in the recording surface into the equation left side (X-a0)2+(Y-b0)2Evaluation see whether etc.
In c0 value, if differed with c0 value within a certain error range, judge that the recording surface for circle, as shown in Fig. 5, Fig. 6, and is remembered
Its three-dimensional central coordinate of circle value (a0, b0, Zvi) is recorded, and taking the circle-center values is the characteristic point of the model.Otherwise the vertex of the model is taken
It is characterized a little.
The various embodiments described above are merely to illustrate the present invention, and wherein data expression etc. is all that can be varied in embodiment
, all equivalents and improvement carried out based on the technical solution of the present invention should not be excluded in protection of the invention
Except range.
Claims (6)
1. a kind of method based on BIM intelligent extraction setting-out characteristic point, which is characterized in that this method comprises the following steps:
(1) any BIM model is chosen to be highlighted；
(2) obtain the normal of all triangular facets in selected BIM model and form the vertex of all triangular facets coordinate value (Xi,
Yi, Zi)；
(3) whether in the same plane to judge adjacent two triangular facets for having common edge, newly-built recording surface saves coplanar three
Edged surface successively traverses all triangular facets, and coplanar triangular facet is stored in respectively in corresponding recording surface；
(4) judge recording surface shape whether be it is round, if circle take the center of circle be the model characteristic point, otherwise take the mould in step (1)
The vertex of type is characterized a little.
2. the method according to claim 1 based on BIM intelligent extraction setting-out characteristic point, which is characterized in that the step
(1) it is the title and number for needing to read BIM model in APP in, then establishes the real time correlation with BIM model in APP, finally
Just this model is highlighted after BIM model button trigger event is occurred by click in APP.
3. the method according to claim 1 based on BIM intelligent extraction setting-out characteristic point, which is characterized in that the step
It (2) is the feature being made of according to BIM model triangular facet or four edged surfaces, the normal and composition of available all triangular facets in
The coordinate value (Xi, Yi, Zi) on the vertex of all triangular facets.
4. the method according to claim 1 based on BIM intelligent extraction setting-out characteristic point, which is characterized in that the step
It (3) is that then the coplanar principle of the two triangular facets is adjacent to judge in parallel according to the normal vector for two triangular facets for having common edge in
Having two triangular facets of common edge, in the same plane whether newly-built recording surface saves coplanar triangular facet, successively traverses institute
There is triangular facet, coplanar triangular facet is stored in respectively in corresponding recording surface.
5. the method according to claim 1 based on BIM intelligent extraction setting-out characteristic point, which is characterized in that the step
It (4) be according to the figure that the identical then all triangular facets in the circumscribed circle centers of circle of all triangular facets in same plane are constituted in is circle
Judge recording surface shape for circle, and take the center of circle be the model characteristic point, otherwise take the model vertex be the model characteristic point.
6. the method according to claim 1 based on BIM intelligent extraction setting-out characteristic point, which is characterized in that backstage into
Row above step needs the movement of a simple click screen only on foreground to show the characteristic point of the model.
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