CN103021012A - Method for combining static structure and utilizing computer to draw dynamic 3D (three-dimension) plant - Google Patents
Method for combining static structure and utilizing computer to draw dynamic 3D (three-dimension) plant Download PDFInfo
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- CN103021012A CN103021012A CN201210593039XA CN201210593039A CN103021012A CN 103021012 A CN103021012 A CN 103021012A CN 201210593039X A CN201210593039X A CN 201210593039XA CN 201210593039 A CN201210593039 A CN 201210593039A CN 103021012 A CN103021012 A CN 103021012A
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Abstract
The invention discloses a method for combining a static structure and utilizing a computer to draw a dynamic 3D (three-dimension) plant. The method includes following steps: establishing the static structure of a 3D plant; subjecting the established static structure of the 3D plant to quantitative description of geometric information and topological information; determining growth points on the plant and growth parameters of each growth point; performing dynamic simulating calculation to growth of growing objects on the growth points of the static structure of the 3D plant according to the growth parameters of each growth point; and drawing a virtual 3D plant according to the static structure of the plant and results of the dynamic simulating calculation. By the method, 3D plants with rich forms can be drawn.
Description
Technical field
The invention belongs to virtual reality and computer drawing technology field, particularly utilize the method for the dynamic 3D plant of computer drawing.The present invention can be applicable to digital agriculture and forestry, digital entertainment, landscape design.
Background technology
Virtual plant is the important content in three-dimensional (3D) scene, is generally used in the fields such as computer game, film special effect making, landscape design.Along with the development of computer hardware technique, the high realism Fast Drawing that carries out complicated virtual plant scene has become possibility.By contrast, the 3D form that is applied to the virtual plant of above-mentioned occasion substantially also derives from interactively hand-designed and computer simulation.The virtual plant that computer simulation produces can produce complicated fine structure, but the general comparison rule of form.
Yet the plant structure attitude in the real world is abundant, in general, except the top branch of living plant one or two years, such as the structure of the trees that grow up etc., the process because beta pruning, branch come off etc. is difficult to realize the dynamic similation of trees from the treelet to the bearing tree by observing.Therefore, be difficult to actual trees are carried out dynamic similation from the little tree to the bearing tree.
In recent years, in rising trend by a research of cloud reconstruction tree structure again based on the cloud data of 3 D laser scanning acquisition trees, can obtain actual trees form, the according to a preliminary estimate diameter of trees trunk, and the annexation of calculating the inner branch of tree crown.This class research is applied to urban look and makes up, and the volume of timber of forest assessment.Its advantage is to come off etc. and the irregular form of trees that causes for beta pruning, branch, can directly obtain by rebuilding, and does not need process model building.
Yet what obtain based on three-dimensional laser scanner is static plant structure, and dynamic growth that can not simulating plant can not satisfy according to the demand of scanning result to predicting future.The method that other methods that obtain the trees static structures utilize multiple image to rebuild is in addition utilized the framework extraction method of depth map and pure manual interaction design.Its relative merits are also the same.
Summary of the invention
The technical matters that (one) will solve
The present invention proposes a kind of method of utilizing the dynamic 3D plant of computer drawing, solving for the static structure of virtual plant and the dynamic similation problem of combination well, for the form Design of 3D virtual plant, growth prediction etc. provide a kind of new approach.
(2) technical scheme
For solving the problems of the technologies described above, the present invention proposes a kind of method of utilizing the dynamic 3D plant of computer drawing, it is characterized in that, comprises the steps:
S1, set up the static structure of 3D plant;
S2, the static structure of described 3D plant carried out the quantitative description of geological information and topology information;
S3, determine new branch growing point and the geometry of each growing point and topological growth parameter(s) described plant;
S4, on the growing point of the static structure of described 3D plant, carry out the dynamic similation of new branch according to the growth parameter(s) of each growing point;
S5, draw described 3D virtual plant according to static structure and the dynamic similation result of calculation of above-mentioned plant.
According to a kind of embodiment of the present invention, in the process of described step S3 to the dynamic similation calculating of described plant, the static structure of described 3D plant is upgraded.
According to a kind of embodiment of the present invention, the step of updating of described step S3 comprises: the Internode diameter in the described trees static structure increases in proportion according to this internode top leaf number.
According to a kind of embodiment of the present invention, input computing machine after the step of the static structure of acquisition 3D plant can utilize 3D laser scanning or interactive design method to set up the static structure data among the described step S1.
According to a kind of embodiment of the present invention, described topology information comprises the annexation between annexation between the branch and the inner different internodes of branch, and geological information comprises space angle and all Internode diameters of branch.
According to a kind of embodiment of the present invention, the dynamic similation among the described step S4 refers to the simulation of the new branch at each growing point place in static structure, and each new branch is equivalent to an independently plant, adopts identical growth model, and only model parameter is different.
(3) beneficial effect
The present invention takes full advantage of the static structure modeling, can obtain the abundant main limb pattern of virtual 3D phytomorph; Simultaneously, the present invention is apparent in view to the botany rule, be subjected to the little plants shoots of external interference to carry out dynamic similation, can obtain quickly the plant details enriched, and can simulate and the dynamic change of drafting 3 D phytomorph.
Description of drawings
Fig. 1 is the process flow diagram that utilizes the method for the dynamic 3D plant of computer drawing of the present invention;
Fig. 2 is the static structure figure of the one tree set up of one embodiment of the invention;
Fig. 3 is the skeleton synoptic diagram of the static initial tree timber structure of one embodiment of the invention;
Fig. 4 be one embodiment of the invention growing point choose alternately synoptic diagram;
Fig. 5 is the new plant skeleton synoptic diagram that the information according to growing point of one embodiment of the invention produces;
Fig. 6 is the plant dynamic drafting figure based on static structure of one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Fig. 1 is the process flow diagram that utilizes the method for the dynamic plant of computer drawing 3D of the present invention.As shown in Figure 1, method of the present invention comprises the steps S1～S5:
S1, set up the static structure of 3D plant.Static structure among the present invention is the geometric shape of refering in particular to a certain moment of trees of describing with the spatial point position of limb.Static structure can comprise leaf, also can not comprise leaf.
The method of setting up the static structure of 3D plant can have multiple, comprises the static structure data of utilizing the 3 D laser scanning means to obtain real plants, the method for rebuilding based on multiple image, the perhaps construction method by the operation of man-machine interactively formula etc.
Below, we illustrate that by an embodiment this embodiment utilizes computing machine to come the method for drafting 3 D tree.Figure 2 shows that the static structure figure of the one tree that this embodiment sets up.As shown in the figure, this tree comprises a trunk, tells three branches at the top of trunk, tells again a plurality of branches on three branches.
S2, the static structure of the 3D plant of setting up carried out the quantitative description of geological information and topology information.The plant structure of static state is divided into leaf unit of botany unit to be described from the space.A leaf unit comprises a joint, and an internode, each joint are being gone up and given birth to one or more pieces leaves, and the axillalry bud of respective numbers.Internode refers to the part between upper two leaves that produce continuously of limb.Topology information refers to the annexation between the different internodes of annexation between the plants shoots and branch inside.Geological information refers to space angle and the Internode diameter of all internodes.Only has the original static structure of branch length for not having the leaf metamessage, then by specifying panel length that total is divided.
The static structure that Fig. 3 shows the tree that creates for Fig. 2 is carried out the plant skeleton synoptic diagram that obtains behind the quantitative description of geological information and topology information.Before key diagram 3, need the several concepts among clear and definite the present invention, i.e. growth axis and bud.In the present invention, growth axis refers to not comprise in the branch main shaft portion of branch, is made of internode, and bud refers to that adnation is in the part that can produce new branch on internode top.
As shown in Figure 3, this tree can be decomposed into different growth axiss, and each growth axis includes the internode of some, each internode can give birth to and to comprise 0 or 0 above bud or growth axis.Structure shown in Figure 3 can be described with existing data structure, and is as follows.
Wherein, ID is unique Digital ID of growth axis.Len is the leaf unit number that comprises in the growth axis.M (length) is the specific descriptions to each leaf unit.Its data structure MEIAMER is described below:
As above data structure has comprised the annexation between the growth axis, and the size of the internode in each growth axis.
S3, determine growing point and the growth parameter(s) of each growing point described plant.
So-called growing point refers to begin from static plant structure the place of new shoot growth, growth parameter(s) refers to be used to the model parameter that makes up dynamic plant structure, model refers to produce Dual-Scale Automaton or the Lindenmayer system of dynamic plant structure, growth parameter(s) comprises the internode number and the structural parameters of direction that the every class bud of control produces at each time quantum, and the functional parameter of controlling internode and other organ sizes.The little tree of the independent growth that the branch of growing on each growing point is considered as being produced by same growth model parallel running.
Determining and can calculating by experimental formula of growing point and growth parameter(s) thereof perhaps specified by the interactive operation of people and computing machine.
In the above-described embodiments, Fig. 4 has shown its location of growing point of determining by interactive selection.And each growing point arranges identical growth parameter(s), and namely each bud produces 10 to 15 internodes, and the 1-5 at a top internode comprises an identical bud, and the insertion angle of the growth axis that bud produces is 30 degree with the angle of female branch.
S4, on the growing point of the static structure of described 3D plant, according to the growth parameter(s) of each growing point growth-gen grown into the Mobile state analog computation.
According to the present invention, can use for reference the morphological Simulation technology of individual plants, so that the dynamic similation process of static structure upper branch is similar to the simulation of the plant population that is made of the individual plant plant etc.
In the above-described embodiments, each growing point position has produced a new branch.Because all growing point positions form new branch simultaneously, so that new tree crown has been formed on the plant top, as shown in Figure 5.
In this step, in the process that the dynamic similation to described plant calculates, can upgrade the static structure of described 3D plant.It is whole that the structure of considering static structure and dynamic similation belongs to same plant, so the simulation of dynamic structure can have influence on existing static structure, for example diameter increases thick.According to the present invention, set up dynamic similation to the feedback mechanism of plant static structure, namely the Internode diameter in the static structure is followed according to the leaf trees in the dynamic structure increases in proportion.
In the above-described embodiments, Fig. 6 has showed the plant three-dimensional shape corresponding to Fig. 5 skeleton, and wherein as shown in the figure the Internode diameter of static structure part increases according to top leaf number.
S5, last draws described 3D virtual plant according to static structure and the dynamic similation result of calculation of above-mentioned plant.According to the present invention, can also in computing machine, static structure and the dynamic similation result of calculation to above-mentioned plant preserve.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; be understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a method of utilizing the dynamic 3D plant of computer drawing is characterized in that, comprises the steps:
S1, set up the static structure of 3D plant;
S2, the static structure of described 3D plant carried out the quantitative description of geological information and topology information;
S3, determine new branch growing point and the geometry of each growing point and topological growth parameter(s) described plant;
S4, on the growing point of the static structure of described 3D plant, carry out the dynamic similation of new branch according to the growth parameter(s) of each growing point;
S5, draw described 3D virtual plant according to static structure and the dynamic similation result of calculation of above-mentioned plant.
2. the method for utilizing the dynamic 3D plant of computer drawing as claimed in claim 1 is characterized in that:
In the process of described step S3 to the dynamic similation calculating of described plant, the static structure of described 3D plant is upgraded.
3. the method for utilizing the dynamic 3D plant of computer drawing as claimed in claim 2 is characterized in that, the step of updating of described step S3 comprises: the Internode diameter in the described trees static structure increases in proportion according to this internode top leaf number.
4. the method for utilizing the dynamic 3D plant of computer drawing as claimed in claim 1, it is characterized in that, input computing machine after the step of the static structure of acquisition 3D plant can utilize 3D laser scanning or interactive design method to set up the static structure data among the described step S1.
5. the method for utilizing the dynamic 3D plant of computer drawing as claimed in claim 1, it is characterized in that, described topology information comprises the annexation between annexation between the branch and the inner different internodes of branch, and geological information comprises space angle and all Internode diameters of branch.
6. the method for utilizing the dynamic 3D plant of computer drawing as claimed in claim 1, it is characterized in that, dynamic similation among the described step S4 refers to the simulation of the new branch at each growing point place in static structure, each new branch is equivalent to an independently plant, adopt identical growth model, only model parameter is different.
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Cited By (6)
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| CN104282034A (en) * | 2013-07-03 | 2015-01-14 | 中国科学院深圳先进技术研究院 | Plant growth animation synthesis method |
| CN104504752A (en) * | 2015-01-06 | 2015-04-08 | 中国农业大学 | Visual simulation method for virtual growth of jujube trees |
| CN104620879A (en) * | 2015-01-21 | 2015-05-20 | 中国科学院自动化研究所 | Tree pruning optimizing method based canopy light distribution analog |
| CN108229018A (en) * | 2018-01-02 | 2018-06-29 | 北京林业大学 | Method based on the simulation rime growth for dividing shape and Berlin noise |
| CN111523187A (en) * | 2020-03-10 | 2020-08-11 | 浙江工业大学 | Particle swarm-based virtual plant growth model parameter extraction method |
| CN113160368A (en) * | 2021-03-17 | 2021-07-23 | 网易（杭州）网络有限公司 | Animation data processing method and device |
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Cited By (8)
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| CN104282034A (en) * | 2013-07-03 | 2015-01-14 | 中国科学院深圳先进技术研究院 | Plant growth animation synthesis method |
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| CN108229018A (en) * | 2018-01-02 | 2018-06-29 | 北京林业大学 | Method based on the simulation rime growth for dividing shape and Berlin noise |
| CN111523187A (en) * | 2020-03-10 | 2020-08-11 | 浙江工业大学 | Particle swarm-based virtual plant growth model parameter extraction method |
| CN111523187B (en) * | 2020-03-10 | 2024-05-07 | 浙江工业大学 | Particle swarm-based virtual plant growth model parameter extraction method |
| CN113160368A (en) * | 2021-03-17 | 2021-07-23 | 网易（杭州）网络有限公司 | Animation data processing method and device |
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Application publication date: 20130403 |