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3D Plants Modeling Reporter: Zeng Lanling Sep. 17,2008.

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Presentation on theme: "3D Plants Modeling Reporter: Zeng Lanling Sep. 17,2008."— Presentation transcript:

1 3D Plants Modeling Reporter: Zeng Lanling Sep. 17,2008

2 Floral Diagrams and Inflorescences: Interactive Flower Modeling Using Botanical Structural Constraints Takashi Ijiri (The University of Tokyo), Shigeru Owada (The University of Tokyo and Sony CSL), Makoto Okabe, (The University of Tokyo), Takeo Igarashi (The University of Tokyo and JST/PRESTO) siggraph2005 Seamless Integration of Initial Sketching and Subsequent Detail Editing in Flower Modeling Takashi Ijiri (The University of Tokyo), Shigeru Owada (The University of Tokyo and Sony CSL), Takeo Igarashi (The University of Tokyo and JST/PRESTO) Eurographics2006 Inhibition Fields for Phyllotactic Pattern Formation: a Simulation Study Richard S. Smith (Univercity of Calgery), Cirs Kuhlemeler (University of Bern), Przemyslaw prusikiewicz (Univercity of Calgery) 2006 NRC Canada

3 Floral diagrams and inflorescences : Interactive flower modeling using botanical structural constraints Takashi Ijiri (The University of Tokyo) Shigeru Owada (Sony CS Laboratories Inc.) Makoto Okabe (The University of Tokyo) Takeo Igarashi (The University of Tokyo, PRESTO/JST)

4 Contribution Interaction techniques –A specific system to model flowers quickly and easily –Provide structural information of flowers developed by botanists : floral diagrams & inflorescences Separating structural editing and geometry editing –Provide sketching interfaces for user convenience

5 Notions Floral diagram –An iconic description of a flowers structural characteristics –To design individual flowers Inflorescence –A branch with multiple flowers and its branching pattern represented in a pictorial form –To design many flowers

6 Notions Floral diagramInflorescence

7 Floral Diagram Pi : pistil : St : stamen : Pe : petal : O : ovary : Se : sepal : Bra : bract : R : floral receptacle : A : axis Up : petal connate to petal : Sp : sepal adnate to stamen :

8 Inflorescence Indeterminate : lower ones bloom first and higher ones follow –(A) raceme( ), (B) corymb Determinate : top or central first, lower or lateral follow –(C) dichasium, (D) drepanium Compound : mixture –(E) compounded raceme (A) (B) (C) (D) (E)

9 Overview

10 Floral Diagram Editor (a) Edior(b) Brassica Rapa(c) Ranunculus acris

11 Floral Component Edit sketch to 3D model transform along center vein global transform local transform

12 Inflorescence Editor

13 Result I

14 II

15 Result III

16 Result IV

17 Seamless Integration of Initial Sketching and Subsequent Detail Editing in Flower Modeling Takashi Ijiri (The University of Tokyo) Shigeru Owada (Sony CS Laboratories Inc.) Takeo Igarashi (The University of Tokyo, PRESTO/JST)

18 Overview of the modeling process

19 Initial sketch as hierarchical billboards

20 Component representation

21 Main edit window and an overview window

22 Construction of an initial sketch

23 Transformation of the sketch into a 3D model One is to create a new 3D component on the billboard. The other method reuse existing 3D components from the component library.

24 Creating a new components If the billboard type is a branch, when the user pressescreate 3D c omponent button, the system generates a generalized cylinder alo ng the skeleton of the billboard. The user then specifies its radius, color, and texture using standard GUIs.

25 Creating a new components Construction of a leaf. (a) A billboard is transformed into a leaf. (b) The system presents a curved blue canvas. (c) On which the user creates a leaf by drawing two outlines. (d) The user can also modify t he shape by drawing modifying strokes (d).

26 Creating a new components Construction of a flower. (a) A billboard is transformed into a f lower. (b) The system generates a floral receptacle and presents it s diagram (c). The user then creates billboards or 3D components and arranges them on the receptacle (d), (e).

27 Reusing a 3D component Billboard replacement. The user clicks to select a component (a) and target billboards (b). The system then replaces billboards with the specified component (c). Users may also double-click to select all sibl ing billboards (d).

28 Reusing a 3D component Placing 3D components. The user selects a source (a) from the library and draws a skeleton stroke (b). The system then places the object (c). Examples of more complicated objects are shown in (d) and (e).

29 Reusing a 3D component Fitting a leaf object to the target skeleton

30 Skeleton-based deformation of 3D components Skeleton-based deformation. The user draws the stroke shown in red (a) and then the system deforms the target stem (b) so that the stems skeleton fits the stroke on the screen (c).

31 Skeleton-based deformation of 3D components Fitting the skeleton to the user-drawn stroke

32 Result

33

34 Richard S. Smith (The University of Calgary) Ris Kuhlemeier (The University of Berne) Przemyslaw Prusinkiewicz (The University of Calgary) Inhibition Fields for Phyllotactic Pattern Formation: a Simulation Study

35 Main idea The postulate that existing primordia inhibit the formation of new primordia nearby.

36 Objective The model can generate a wide variety of phyllotactic patterns Patterns can start in an empty peripheral zone or from one or two cotyledons The model can capture transitions in phyllotaxis, such as the often-observed transition from decussate to spiral patterns The patterns can be initiated an propagated in a robust manner

37 Phyllotactic patterns

38 Model

39

40 Diagram of inhibition

41

42 Inhibition threshold

43

44 Inhibition threshold(128)

45 Example(Arabidopsis)

46 Two inhibition functions

47

48

49 Other method

50

51

52 Thank you!


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