CN104392484A - Three-dimensional tree modeling method and device thereof - Google Patents
Three-dimensional tree modeling method and device thereof Download PDFInfo
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- 238000005859 coupling reaction Methods 0.000 claims description 29
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- 230000002093 peripheral effect Effects 0.000 claims description 14
- 238000000059 patterning Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
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Abstract
The invention belongs to the field of computer graphics and provides a three-dimensional tree modeling method and a device thereof. The method comprises the steps of partially intercepting the existing three-dimensional tree model to obtain a plurality of model components, setting the parameters of the obtained plurality of model components to match the plurality of model components with each other, and performing interpolation processing on the plurality of matched model components to generate connecting components between the adjacent model components. The three-dimensional tree modeling method is capable of generating a new three-dimensional tree model mainly by intercepting a plurality of model components from the existing tree model for adjustment and combination and generating the connecting parts between the different model components by use of an interpolation algorithm; the modeling process does not involve with the acquisition of three-dimensional data, and therefore, the data processing link in the modeling process is greatly simplified and the three-dimensional tree modeling efficiency is improved.
Description
Technical field
The invention belongs to field of Computer Graphics, particularly relate to a kind of Three-dimension Tree modeling method and device.
Background technology
In technical fields such as cybercity construction, computer game scene design, virtual realities, Tree vigorous degree has broad application prospects.Existing Three-dimension Tree modeling mostly obtains based on three-dimensional data and realizes, need the three-dimensional data information first obtaining trees, such as, three-dimensional laser scanner is used to gather the three-dimensional point cloud of trees, or use the image at the multiple visual angle of collected by camera trees, etc., and then use three-dimensional rebuilding method to set up Three-dimension Tree model.But above-mentioned 3-D data collection method needs the 3-D data collection equipment using specialty mostly, and data handling procedure is numerous and diverse, time-consuming, makes Three-dimension Tree modeling process inefficiency.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of Three-dimension Tree modeling method, is intended to solve the low problem of current Three-dimension Tree modeling efficiency.
The embodiment of the present invention is achieved in that a kind of Three-dimension Tree modeling method, comprising:
Portion intercepts is carried out to existing Three-dimension Tree model, gets multiple model component;
Optimum configurations is carried out to the described multiple model component got, to make mutually to mate between described multiple model component;
Interpolation processing is carried out to the described multiple model component mutually matched, generates the coupling assembling between adjacent described model component.
Another object of the embodiment of the present invention is to provide a kind of Three-dimension Tree model building device, comprising:
Interception unit, for carrying out portion intercepts to existing Three-dimension Tree model, gets multiple model component;
Setting unit, for carrying out optimum configurations to the described multiple model component got, to make mutually to mate between described multiple model component;
Interpolating unit, for carrying out interpolation processing to the described multiple model component mutually matched, generates the coupling assembling between adjacent described model component.
The embodiment of the present invention carries out adjusting, combining mainly through intercepting some model components from existing tree modelling, and generate the coupling part between different model component by interpolation algorithm, thus generate new Three-dimension Tree model, this modeling process does not relate to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improve the efficiency of Three-dimension Tree modeling.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the Three-dimension Tree modeling method that the embodiment of the present invention provides;
Fig. 2 is the exemplary plot of the handheld laser scanner that the embodiment of the present invention provides;
Fig. 3 is the exemplary plot of the existing Three-dimension Tree model that the embodiment of the present invention provides;
Fig. 4 is the three-dimensional framework exemplary plot that Three-dimension Tree model that the embodiment of the present invention provides is corresponding with it;
Fig. 5 is the exemplary plot of carrying out portion intercepts on existing Three-dimension Tree model that the embodiment of the present invention provides;
Fig. 6 is the exemplary plot of the model component that the embodiment of the present invention provides;
Fig. 7 is the specific implementation process flow diagram of the Three-dimension Tree modeling method S103 that the embodiment of the present invention provides;
Fig. 8 is the hermit curve exemplary plot that the embodiment of the present invention provides;
Fig. 9 is the corresponding relation exemplary plot on the peripheral summit of two xsects that the embodiment of the present invention provides;
Figure 10 is the interpolation result two-dimensional example figure carrying out interpolation between the corresponding point of two xsects that the embodiment of the present invention provides;
Figure 11 is the three dimensional example figure of the interpolation result that different hermit curves that the embodiment of the present invention provides are corresponding;
Figure 12 is the exemplary plot to the tree modelling coupling true geometric surface generated that the embodiment of the present invention provides;
Figure 13 be the embodiment of the present invention provide add the effect exemplary plot of limb and blade for tree modelling;
Figure 14 is the Three-dimension Tree modeled example figure that the embodiment of the present invention provides;
Figure 15 is the structured flowchart of the Three-dimension Tree model building device that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention carries out adjusting, combining mainly through intercepting some model components from existing tree modelling, and generate the coupling part between different model component by interpolation algorithm, thus generate new Three-dimension Tree model, this modeling process does not relate to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improve the efficiency of Three-dimension Tree modeling.
Fig. 1 shows the realization flow of the Three-dimension Tree modeling method that the embodiment of the present invention provides, and details are as follows:
In S101, portion intercepts is carried out to existing Three-dimension Tree model, gets multiple model component.
Before S101, Three-dimension Tree model database can be set up in advance, such as, adopt handheld laser scanner as shown in Figure 2 to gather the three-dimensional point cloud of variety classes in reality, different shape trees, and adopt the method for Poisson reconstruction to obtain the Three-dimension Tree model (Fig. 3 shows the Three-dimension Tree model that part establishes in advance) of these trees to the three-dimensional point cloud collected.While obtaining the Three-dimension Tree model of these trees, tree modelling skeleton generation method can also be used, generate the three-dimensional framework of these trees, this three-dimensional framework is for stating the limb trend of trees, as shown in Figure 4, left figure is the Three-dimension Tree model established, and right figure is the three-dimensional framework that this Three-dimension Tree model is corresponding.
The process of establishing of above-mentioned Three-dimension Tree model database can have been come by the field of three-dimension modeling technician of specialty, and this database is used as modeling material database and is opened to user.
Fig. 5 is the schematic diagram carrying out portion intercepts on existing Three-dimension Tree model.
Fig. 6 shows the some model components by carrying out existing Three-dimension Tree model accessed by portion intercepts.
In S102, optimum configurations is carried out to the described multiple model component got, to make mutually to mate between described multiple model component.
In the present embodiment, mutually mate between multiple model component, refer to that the parameters such as the linking relationship between this multiple model component size separately, direction and this multiple model component are all configured in suitable value, be positioned among one tree wood reasonably, in an orderly manner to enable this multiple model component.
Wherein, linking relationship between multiple model component, for representing the ordinal relation of this multiple model component placement location in the Three-dimension Tree model that will create, such as, from treetop to tree root, sequentially place model component 1, model component 2, model component 3 and model component 4.By this linking relationship, the model component adjacent with a model component can be determined.As a kind of implementation, linking relationship can specify generation by user.
Preferably, the graphics system for man-machine interaction can be set up, realize the optimum configurations to this multiple model component by visualized operation.Particularly, opengl projection algorithm is utilized by computer background, model component and three-dimensional coordinate are projected to screen coordinate, thus the two-dimensional coordinate of three-dimensional coordinate and screen is mapped, to realize the optimum configurations to model component in conjunction with keyboard, mouse or gesture operation operations such as (such as move, rotate) convergent-divergents.Under this interactive graphics system, sequentially can be placed by model component by pulling mode, system background, according to the placement location of model component, automatically establishes the link relation between adjacent two model components.
In S103, interpolation processing is carried out to the described multiple model component mutually matched, generate the coupling assembling between adjacent described model component.
Because the model component got in S101 is discrete, therefore, need to carry out interpolation processing to this part discrete model component, connect the remainder between completion consecutive phantom assembly.
As shown in Figure 7, S103 is specially:
In S701, between adjacent described model component, generate hermit curve by interpolation.
Particularly, interpolation can be carried out to the trees skeleton corresponding to consecutive phantom assembly, generate corresponding hermit curve.The hermit curve generated is for representing the limb trend between two consecutive phantom assemblies, and after hermit curve generates, above-mentioned limb trend can be changed by the bent curvature of a curve of adjustment hermit, need to conform to modeling to make the trend of the final limb generated.
Fig. 8 is the exemplary plot of the hermit curve that S701 generates, as shown in Figure 8, the straight line in the width figure of left and right two is for representing the linking relationship of the model component shown in figure, and curve is hermit curve, can find out, the bent curvature of a curve of the hermit generated in the width figure of left and right two is different.
In S702, set up the corresponding relation between two on the peripheral summit of the first xsect and the second xsect, described first xsect and described second xsect are the adjacent cross sectional of adjacent described model component.
After creating hermit curve, need to play up the limb part between generation two consecutive phantom assemblies.First, in S702, set up the corresponding relation on the peripheral summit of adjacent cross sectional, particularly, the while of can putting from certain on two adjacent cross sectional respectively, according to clockwise or counterclockwise direction, determine the corresponding point between two xsects successively.
Fig. 9 is the two-dimensional representation of the corresponding point between the first xsect and the second xsect got in S702, according to the skeleton direction of model, first xsect 91 is positioned at the top of the second xsect 92, and the dotted line in figure indicates the corresponding relation between the first xsect 91 and the part peripheral summit of the second xsect 92.
Wherein, preferably corresponding relation is: the quadratic sum of the displacement between all peripheral summits corresponding is between two minimum, can ensure that the deformation of the xsect carrying out interpolation in subsequent processes between corresponding point is minimum like this, and can keep the distorted shape of limb.
In S703, between described first xsect and the corresponding point of described second xsect, carry out interpolation.
Figure 10 is the interpolation result two-dimensional example figure carrying out interpolation according to the corresponding relation of Fig. 9 between corresponding point, and can find out, between the first xsect and the second xsect, interpolation generates the peripheral summit of three xsects.
In S704, by interpolation result along the hermit curve movement of correspondence and rotation, generate the coupling assembling between described first xsect and described second xsect.
In this step, the hermit song curvature of a curve of the peripheral summit keeping interpolation to generate and correspondence is constant, and the hermit segment of curve of the peripheral summit of interpolation generation along its correspondence is moved and rotate, thus the coupling assembling generated between the first xsect and the second xsect, the limb part namely between the first xsect and the second xsect.
Figure 11 shows the interpolation result corresponding according to two kinds of different hermit Curves of generation embodiment illustrated in fig. 7.
In embodiments of the present invention, the coupling assembling of the tree modelling only relying on the interpolation processing of S103 to generate is too smooth, lack the details such as due concavo-convex, fold in true trees, therefore, need the true geometric surface of existing Three-dimension Tree model to carry out deformation process, go to mate the coupling part generated in S103.Particularly, coupling assembling and existing Three-dimension Tree model are all expressed as general right cylinder, record radius between the two and relative potential difference, by the size of the scaled of existing Three-dimension Tree model to coupling assembling, and move to the position of coupling assembling, keep the potential difference of existing Three-dimension Tree model, so just can obtain the Three-dimension Tree model with real surface geometric detail.
As shown in figure 12, the coupling assembling obtained after being respectively the coupling assembling that S103 obtains, the part limb of existing Three-dimension Tree model, distortion coupling from left to right.
As shown in figure 13, left figure is the Three-dimension Tree model obtained by above-mentioned steps, finally, the mode of auto linear system can be adopted on this Three-dimension Tree model to play up little limb and leaf, increase the sense of reality of trees, finally obtain the Three-dimension Tree model that fidelity shown in figure as right in Figure 13 is high.
The Three-dimension Tree model generated after the model component that Figure 14 mates after being S101 and S102 successively from left to right, interpolation and the rendering effect that with the addition of after withe and blade.
The embodiment of the present invention carries out adjusting, combining mainly through intercepting some model components from existing tree modelling, and generate the coupling part between different model component by interpolation algorithm, thus generate new Three-dimension Tree model, this modeling process does not relate to the collection of three-dimensional data, enormously simplify the data processing link in modeling process, improve the efficiency of Three-dimension Tree modeling.
Figure 15 shows the structured flowchart of the Three-dimension Tree model building device that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present embodiment.
With reference to Figure 15, this device comprises:
Interception unit 1501, carries out portion intercepts to existing Three-dimension Tree model, gets multiple model component.
Setting unit 1502, carries out optimum configurations to the described multiple model component got, to make mutually to mate between described multiple model component.
Interpolating unit 1503, carries out interpolation processing to the described multiple model component mutually matched, and generates the coupling assembling between adjacent described model component.
Alternatively, described setting unit 1502 specifically for:
Linking relationship between the size of described model component, direction and described multiple model component is set.
Alternatively, described interpolating unit comprises:
Curve generates subelement, between adjacent described model component, generate hermit curve by interpolation.
Corresponding relation sets up subelement, sets up the corresponding relation between two on the peripheral summit of the first xsect and the second xsect, and described first xsect and described second xsect are the adjacent cross sectional of adjacent described model component.
Interpolation subelement, carries out interpolation between described first xsect and the corresponding point of described second xsect.
Coupling assembling generates subelement, for by interpolation result along the hermit curve movement of correspondence and rotation, generate the coupling assembling between described first xsect and described second xsect.
Alternatively, described corresponding relation meets: the quadratic sum of the displacement between all peripheral summits corresponding is between two minimum.
Alternatively, described device also comprises:
Geometric jacquard patterning unit surface processing unit, carries out deformation process by the geometric jacquard patterning unit surface of existing Three-dimension Tree model, and is matched to described coupling assembling.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Three-dimension Tree modeling method, is characterized in that, comprising:
Portion intercepts is carried out to existing Three-dimension Tree model, gets multiple model component;
Optimum configurations is carried out to the described multiple model component got, to make mutually to mate between described multiple model component;
Interpolation processing is carried out to the described multiple model component mutually matched, generates the coupling assembling between adjacent described model component.
2. the method for claim 1, is characterized in that, described described multiple model component to getting carries out optimum configurations and comprises:
Linking relationship between the size of described model component, direction and described multiple model component is set.
3. the method for claim 1, is characterized in that, described described multiple model component to mutually matching carries out interpolation processing, and the coupling assembling generated between adjacent described model component comprises:
Hermit curve is generated by interpolation between adjacent described model component;
Set up the corresponding relation between two on the peripheral summit of the first xsect and the second xsect, described first xsect and described second xsect are the adjacent cross sectional of adjacent described model component;
Interpolation is carried out between described first xsect and the corresponding point of described second xsect;
By interpolation result along the hermit curve movement of correspondence and rotation, generate the coupling assembling between described first xsect and described second xsect.
4. method as claimed in claim 3, it is characterized in that, described corresponding relation meets: the quadratic sum of the displacement between all peripheral summits corresponding is between two minimum.
5. the method as described in any one of claim 1-4, is characterized in that, described method also comprises:
The geometric jacquard patterning unit surface of existing Three-dimension Tree model is carried out deformation process, and is matched to described coupling assembling.
6. a Three-dimension Tree model building device, is characterized in that, comprising:
Interception unit, for carrying out portion intercepts to existing Three-dimension Tree model, gets multiple model component;
Setting unit, for carrying out optimum configurations to the described multiple model component got, to make mutually to mate between described multiple model component;
Interpolating unit, for carrying out interpolation processing to the described multiple model component mutually matched, generates the coupling assembling between adjacent described model component.
7. device as claimed in claim 6, is characterized in that, described setting unit specifically for:
Linking relationship between the size of described model component, direction and described multiple model component is set.
8. device as claimed in claim 6, it is characterized in that, described interpolating unit comprises:
Curve generates subelement, for generating hermit curve by interpolation between adjacent described model component;
Corresponding relation sets up subelement, and for setting up the corresponding relation between two on the peripheral summit of the first xsect and the second xsect, described first xsect and described second xsect are the adjacent cross sectional of adjacent described model component;
Interpolation subelement, for carrying out interpolation between described first xsect and the corresponding point of described second xsect;
Coupling assembling generates subelement, for by interpolation result along the hermit curve movement of correspondence and rotation, generate the coupling assembling between described first xsect and described second xsect.
9. device as claimed in claim 8, it is characterized in that, described corresponding relation meets: the quadratic sum of the displacement between all peripheral summits corresponding is between two minimum.
10. the device as described in any one of claim 6-9, is characterized in that, described device also comprises:
Geometric jacquard patterning unit surface processing unit, for the geometric jacquard patterning unit surface of existing Three-dimension Tree model is carried out deformation process, and is matched to described coupling assembling.
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| CN105261062A (en) * | 2015-09-28 | 2016-01-20 | 山东师范大学 | Character segmented modeling method |
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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 |
| CN108717723A (en) * | 2018-04-19 | 2018-10-30 | 浙江大学 | A kind of tree deformation animation method for realizing that shape is kept based on sketch |
| WO2019200683A1 (en) * | 2018-04-19 | 2019-10-24 | 浙江大学 | Sketch-based shape-preserving tree deformation animation method |
| CN110880202A (en) * | 2019-12-02 | 2020-03-13 | 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 |
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| WO2022178714A1 (en) * | 2021-02-23 | 2022-09-01 | 中国科学院深圳先进技术研究院 | Plant modeling method based on gesture interaction, and storage medium and device |
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Application publication date: 20150304 Assignee: SHENZHEN YIHUO TECHNOLOGY CO.,LTD. Assignor: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY CHINESE ACADEMY OF SCIENCES Contract record no.: X2023980043401 Denomination of invention: A 3D Tree Modeling Method and Device Granted publication date: 20171212 License type: Common License Record date: 20231013 |