CN104392484B - A kind of Three-dimension Tree modeling method and device - Google Patents
A kind of Three-dimension Tree modeling method and device Download PDFInfo
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- CN104392484B CN104392484B CN201410640335.XA CN201410640335A CN104392484B CN 104392484 B CN104392484 B CN 104392484B CN 201410640335 A CN201410640335 A CN 201410640335A CN 104392484 B CN104392484 B CN 104392484B
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- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The present invention is applied to field of Computer Graphics, there is provided a kind of Three-dimension Tree modeling method and device, including：Portion intercepts are carried out to existing Three-dimension Tree model, get multiple model components；Parameter setting is carried out to the multiple model component got, so as to be mutually matched between the multiple model component；Interpolation processing is carried out to the multiple model component being mutually matched, generates the connection component between the adjacent model component.The present invention is mainly adjusted by intercepting some model components from existing tree modelling, combined, and the coupling part between different model components is generated by interpolation algorithm, so as to generate new Three-dimension Tree model, the modeling process is not related to the collection of three-dimensional data, the data processing link in modeling process is enormously simplify, improves the efficiency of Three-dimension Tree modeling.
Description
Technical field
The invention belongs to field of Computer Graphics, more particularly to a kind of Three-dimension Tree modeling method and device.
Background technology
Have wide in technical field, Tree vigorous degrees such as cybercity construction, computer game scene design, virtual realities
Application prospect.Existing Three-dimension Tree modeling is mostly based on three-dimensional data and obtained to realize, it is necessary to obtain the three of trees first
Dimension data information, such as, the three-dimensional point cloud of trees is gathered using three-dimensional laser scanner, or use camera collection trees multiple
The image at visual angle, etc., then reuse three-dimensional rebuilding method and establish Three-dimension Tree model.However, above-mentioned three dimensional data collection
Method needs to use the three dimensional data collection equipment of specialty mostly, and data handling procedure is numerous and diverse, time-consuming so that Three-dimension Tree
Modeling process efficiency is low.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of Three-dimension Tree modeling method, it is intended to solves current Three-dimension Tree and builds
Imitate the problem of rate is low.
The embodiment of the present invention is achieved in that a kind of Three-dimension Tree modeling method, including：
Portion intercepts are carried out to existing Three-dimension Tree model, get multiple model components；
Parameter setting is carried out to the multiple model component got, so that mutual between the multiple model component
Match somebody with somebody；
Interpolation processing is carried out to the multiple model component that has been mutually matched, generated between the adjacent model component
Connection component.
The another object of the embodiment of the present invention is to provide a kind of Three-dimension Tree model building device, including：
Interception unit, for carrying out portion intercepts to existing Three-dimension Tree model, get multiple model components；
Setting unit, for carrying out parameter setting to the multiple model component got, so that the multiple model
It is mutually matched between component；
Interpolating unit, for carrying out interpolation processing to the multiple model component being mutually matched, generate adjacent described
Connection component between model component.
The embodiment of the present invention is mainly adjusted by intercepting some model components from existing tree modelling, combined,
And the coupling part between different model components is generated by interpolation algorithm, so as to generate new Three-dimension Tree model, the modeling
Process is not related to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improves Three-dimension Tree and build
The efficiency of mould.
Brief description of the drawings
Fig. 1 is the implementation process figure of Three-dimension Tree modeling method provided in an embodiment of the present invention；
Fig. 2 is the exemplary plot of handheld laser scanner provided in an embodiment of the present invention；
Fig. 3 is the exemplary plot of existing Three-dimension Tree model provided in an embodiment of the present invention；
Fig. 4 is the corresponding three-dimensional framework exemplary plot of Three-dimension Tree model provided in an embodiment of the present invention；
Fig. 5 is the exemplary plot provided in an embodiment of the present invention that portion intercepts are carried out on existing Three-dimension Tree model；
Fig. 6 is the exemplary plot of model component provided in an embodiment of the present invention；
Fig. 7 is Three-dimension Tree modeling method S103 provided in an embodiment of the present invention specific implementation flow chart；
Fig. 8 is hermit curves exemplary plot provided in an embodiment of the present invention；
Fig. 9 is the corresponding relation exemplary plot on the peripheral summit of two cross sections provided in an embodiment of the present invention；
Figure 10 is the interpolation result two provided in an embodiment of the present invention for entering row interpolation between the corresponding points of two cross sections
Tie up exemplary plot；
Figure 11 is the three dimensional example figure of interpolation result corresponding to different hermit curves provided in an embodiment of the present invention；
Figure 12 is the exemplary plot that the tree modelling provided in an embodiment of the present invention to generation matches true geometric surface；
Figure 13 is the effect exemplary plot provided in an embodiment of the present invention that limb and blade are added for tree modelling；
Figure 14 is Three-dimension Tree modeled example figure provided in an embodiment of the present invention；
Figure 15 is the structured flowchart of Three-dimension Tree model building device provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention is mainly adjusted by intercepting some model components from existing tree modelling, combined,
And the coupling part between different model components is generated by interpolation algorithm, so as to generate new Three-dimension Tree model, the modeling
Process is not related to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improves Three-dimension Tree and build
The efficiency of mould.
Fig. 1 shows the implementation process of Three-dimension Tree modeling method provided in an embodiment of the present invention, and details are as follows：
In S101, portion intercepts are carried out to existing Three-dimension Tree model, get multiple model components.
Before S101, Three-dimension Tree model database can be pre-established, for example, using hand-held as shown in Figure 2
Laser scanner come gather variety classes in reality, different shape trees three-dimensional point cloud, and the three-dimensional point cloud to collecting is adopted
To obtain the Three-dimension Tree model of these trees, (Fig. 3 shows the three-dimensional tree that part pre-establishes to the method rebuild with Poisson
Wooden mold).While the Three-dimension Tree model of these trees is obtained, tree modelling skeleton generation method can also be used, it is raw
Into the three-dimensional framework of these trees, the three-dimensional framework is used for the limb trend for stating trees, as shown in figure 4, left figure is to establish
Three-dimension Tree model, and right figure is three-dimensional framework corresponding to the Three-dimension Tree model.
The process of establishing of above-mentioned Three-dimension Tree model database can be by the field of three-dimension modeling technical staff of specialty Lai complete
Into the database is used as modeling material database and is opened to user.
Fig. 5 is the schematic diagram that portion intercepts are carried out on existing Three-dimension Tree model.
Fig. 6 is shown by carrying out some model components accessed by portion intercepts to existing Three-dimension Tree model.
In S102, parameter setting is carried out to the multiple model component got, so that the multiple model component
Between be mutually matched.
In the present embodiment, it is mutually matched between multiple model components, refers to the respective size of this multiple model component, side
To and this multiple model component between the parameter such as linking relationship be configured in suitable value so that this multiple model
Component can be positioned among one tree wood reasonably, in an orderly manner.
Wherein, the linking relationship between multiple model components, for representing this multiple model component in will create three
Tie up the ordinal relation of placement location in tree modelling, for example, from treetop to tree root, sequentially place model component 1, model component 2,
Model component 3 and model component 4.Pass through the linking relationship, it may be determined that the model component adjacent with a model component.As
A kind of implementation, linking relationship can specify generation by user.
Preferably, the graphics system for man-machine interaction can be established, is realized by visualized operation to this multiple model
The parameter setting of component.Specifically, opengl projection algorithms are utilized by computer background, model component and three-dimensional coordinate is projected
To screen coordinate, so as to which the two-dimensional coordinate of three-dimensional coordinate and screen be mapped, to combine keyboard, mouse or gesture operation
(such as move, rotate, scaling etc. operation) realizes the parameter setting to model component., can be with the interactive graphics system
Model component is sequentially placed by pulling mode, placement location of the system background according to model component, automatically adjacent
Relation is established the link between two model components.
In S103, interpolation processing is carried out to the multiple model component being mutually matched, generates the adjacent model
Connection component between component.
Because the model component got in S101 is discrete, therefore, it is necessary to the model component of this some discrete is entered
Row interpolation processing, the remainder between connection and completion consecutive phantom component.
As shown in fig. 7, S103 is specially：
In S701, hermit curves are generated by interpolation between the adjacent model component.
Specifically, row interpolation can be entered to the trees skeleton corresponding to consecutive phantom component, hermit corresponding to generation is bent
Line.The limb trend that the hermit curves of generation are used to represent between two consecutive phantom components, and generated in hermit curves
Afterwards, above-mentioned limb trend can be changed by adjusting hermit songs curvature of a curve, with walking for the limb that to ultimately generate
It is consistent to modeling needs.
Fig. 8 is the exemplary plot of the hermit curves of S701 generations, as shown in figure 8, the straight line in the width figure of left and right two is used for table
The linking relationship of model component shown in diagram, and curve is hermit curves, it can be seen that given birth in the width figure of left and right two
Into hermit songs curvature of a curve it is different.
In S702, the corresponding relation two-by-two on the peripheral summit of the first cross section and the second cross section is established, described first
Cross section and the adjacent cross sectional that second cross section is the adjacent model component.
, it is necessary to render the limb part between two consecutive phantom components of generation after hermit curves are created.It is first
First, in S702, the corresponding relation on adjacent cross sectional periphery summit is established, specifically, can be respectively from two adjacent cross sectionals
On some point set out simultaneously, according to direction clockwise or counter-clockwise, corresponding points between two cross sections of determination successively.
Fig. 9 is the two-dimensional representation of the corresponding points between the first cross section and the second cross section got in S702, according to
According to the skeleton direction of model, the first cross section 91 is located at the top of the second cross section 92, and it is transversal that the dotted line in figure indicates first
Corresponding relation between the part periphery summit of the cross section 92 of face 91 and second.
Wherein, preferable corresponding relation is：The quadratic sum of displacement between all peripheral summits corresponding two-by-two is minimum, this
Sample can ensure that the deformation for entering the cross section of row interpolation in subsequent processes between corresponding points is minimum, and can keep limb
Distorted shape.
In S703, enter row interpolation between the corresponding points of first cross section and second cross section.
Figure 10 is to enter the interpolation result two-dimensional example figure of row interpolation between corresponding points according to Fig. 9 corresponding relation, can be with
Find out, the interpolation in the first cross section and the second cross section generates the peripheral summit of three cross sections.
In S704, by interpolation result along corresponding hermit curve movements and rotation, first cross section is generated
Connection component between second cross section.
In this step, keep peripheral summit and the corresponding hermit songs curvature of a curve of interpolation generation constant, and incite somebody to action
The peripheral summit of interpolation generation is moved and rotated along its corresponding hermit curved section, so as to generate the first cross section and the
Limb part between connection component between two cross sections, i.e. the first cross section and the second cross section.
Figure 11 shows the interpolation result corresponding to the two kinds of different hermit curves generated according to embodiment illustrated in fig. 7.
In embodiments of the present invention, the connection component for the tree modelling that S103 interpolation processing is generated is relied solely on excessively
It is smooth, lack the details such as due bumps, fold in true trees, therefore, it is necessary to by the true of existing Three-dimension Tree model
Geometric jacquard patterning unit surface carries out deformation process, goes to match the coupling part generated in S103.Specifically, by connection component and existing three-dimensional
Tree modelling is all expressed as general cylinder, radius between the two and relative potential difference is recorded, by existing three-dimensional tree wooden model
The scaled of type and is moved to the position of connection component, keeps existing three-dimensional tree wooden model to the size of connection component
The potential difference of type, it can thus obtain the Three-dimension Tree model with real surface geometric detail.
As shown in figure 12, respectively S103 is obtained from left to right connection component, the part of existing Three-dimension Tree model
The connection component obtained after limb, deformation matching.
As shown in figure 13, left figure is the Three-dimension Tree model obtained by above-mentioned steps, finally, can use auto linear
The mode of system has increased the sense of reality of trees toward small limb and leaf is rendered on the Three-dimension Tree model, finally gives such as figure
The high Three-dimension Tree model of fidelity shown in 13 right figures.
Figure 14 is the model component matched after S101 and S102, the three-dimensional tree wooden model generated after interpolation successively from left to right
Type and it with the addition of rendering effect after withe and blade.
The embodiment of the present invention is mainly adjusted by intercepting some model components from existing tree modelling, combined,
And the coupling part between different model components is generated by interpolation algorithm, so as to generate new Three-dimension Tree model, the modeling
Process is not related to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improves Three-dimension Tree and build
The efficiency of mould.
Figure 15 shows the structured flowchart of Three-dimension Tree model building device provided in an embodiment of the present invention, for convenience of description,
It illustrate only part related to the present embodiment.
Reference picture 15, the device include：
Interception unit 1501, portion intercepts are carried out to existing Three-dimension Tree model, get multiple model components.
Setting unit 1502, parameter setting is carried out to the multiple model component got, so that the multiple model
It is mutually matched between component.
Interpolating unit 1503, interpolation processing is carried out to the multiple model component being mutually matched, generated adjacent described
Connection component between model component.
Alternatively, the setting unit 1502 is specifically used for：
Linking relationship between size, direction and the multiple model component of the model component is set.
Alternatively, the interpolating unit includes：
Curve generates, hermit curves are generated by interpolation between the adjacent model component.
Corresponding relation establishes subelement, establishes two-by-two corresponding pass of first cross section with the peripheral summit of the second cross section
System, first cross section and the adjacent cross sectional that second cross section is the adjacent model component.
Interpolation subelement, enter row interpolation between the corresponding points of first cross section and second cross section.
Connection component generates subelement, for interpolation result along corresponding hermit curve movements and rotation, to be generated
Connection component between first cross section and second cross section.
Alternatively, the corresponding relation meets：The quadratic sum of displacement between all peripheral summits corresponding two-by-two is minimum.
Alternatively, described device also includes：
Geometric jacquard patterning unit surface processing unit, the geometric jacquard patterning unit surface of existing Three-dimension Tree model is subjected to deformation process, and be matched to
The connection component.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (8)
- A kind of 1. Three-dimension Tree modeling method, it is characterised in that including：Portion intercepts are carried out to existing Three-dimension Tree model, get multiple model components；Parameter setting is carried out to the multiple model component got, so as to be mutually matched between the multiple model component；Interpolation processing is carried out to the multiple model component being mutually matched, generates the connection between the adjacent model component Component, including：Hermit curves are generated by interpolation between the adjacent model component；Establish the corresponding relation two-by-two on the peripheral summit of the first cross section and the second cross section, first cross section and described the Two cross sections are the adjacent cross sectional of the adjacent model component；Enter row interpolation between the corresponding points of first cross section and second cross section；By interpolation result along corresponding hermit curve movements and rotation, first cross section and described second transversal is generated Connection component between face.
- 2. the method as described in claim 1, it is characterised in that the described pair of the multiple model component got carries out parameter Setting includes：Linking relationship between size, direction and the multiple model component of the model component is set.
- 3. the method as described in claim 1, it is characterised in that the corresponding relation meets：All periphery tops corresponding two-by-two The quadratic sum of displacement between point is minimum.
- 4. the method as described in claim any one of 1-3, it is characterised in that methods described also includes：The geometric jacquard patterning unit surface of existing Three-dimension Tree model is subjected to deformation process, and is matched to the connection component.
- A kind of 5. Three-dimension Tree model building device, it is characterised in that including：Interception unit, for carrying out portion intercepts to existing Three-dimension Tree model, get multiple model components；Setting unit, for carrying out parameter setting to the multiple model component got, so that the multiple model component Between be mutually matched；Interpolating unit, for carrying out interpolation processing to the multiple model component being mutually matched, generate the adjacent model Connection component between component；The interpolating unit includes：Curve generates, for generating hermit curves by interpolation between the adjacent model component；Corresponding relation establishes subelement, for establishing two-by-two corresponding pass of first cross section with the peripheral summit of the second cross section System, first cross section and the adjacent cross sectional that second cross section is the adjacent model component；Interpolation subelement, for entering row interpolation between the corresponding points of first cross section and second cross section；Connection component generates subelement, for by interpolation result along corresponding hermit curve movements and rotation, described in generation Connection component between first cross section and second cross section.
- 6. device as claimed in claim 5, it is characterised in that the setting unit is specifically used for：Linking relationship between size, direction and the multiple model component of the model component is set.
- 7. device as claimed in claim 5, it is characterised in that the corresponding relation meets：All periphery tops corresponding two-by-two The quadratic sum of displacement between point is minimum.
- 8. the device as described in claim any one of 5-7, it is characterised in that described device also includes：Geometric jacquard patterning unit surface processing unit, for the geometric jacquard patterning unit surface of existing Three-dimension Tree model to be carried out into deformation process, and it is matched to The connection component.
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| CN107943072B (en) * | 2017-11-13 | 2021-04-09 | 深圳大学 | Unmanned aerial vehicle flight path generation method and device, storage medium and equipment |
| CN108717723B (en) * | 2018-04-19 | 2019-06-11 | 浙江大学 | A kind of tree deformation animation method for realizing that shape is kept based on sketch |
| CN110880202B (en) * | 2019-12-02 | 2023-03-21 | 中电科特种飞机系统工程有限公司 | Three-dimensional terrain model creating method, device, equipment and storage medium |
| CN112328821A (en) * | 2020-10-27 | 2021-02-05 | 同济大学 | Three-dimensional tree model matching method based on tree space |
| CN112799517B (en) * | 2021-02-23 | 2022-08-16 | 中国科学院深圳先进技术研究院 | Plant modeling method based on gesture interaction and plant modeling device and equipment thereof |
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