20080917 zenglanling 3d plant modeling

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3D Plants Modeling

Reporter: Zeng LanlingSep. 17,2008


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Floral Diagrams and Inflorescences: Interactive Flower Modeling Using

Botanical Structural Constraints

Takashi Ijiri (The University of Tokyo), Shigeru Owada (TheUniversity of Tokyo and Sony CSL), Makoto Okabe, (The University

of Tokyo), Takeo Igarashi (The University of Tokyo and JST/PRESTOsiggraph2005

Seamless Integration of Initial Sketching and Subsequent Detail

Editing in Flower Modeling

Takashi Ijiri (The University of Tokyo), Shigeru Owada (TheUniversity of Tokyo and Sony CSL), Takeo Igarashi (The University o

Tokyo and JST/PRESTO) Eurographics2006

Inhibition Fields for Phyllotactic Pattern Formation: a Simulation Study

Richard S. Smith (Univercity of Calgery), Cirs Kuhlemeler (Universityof Bern), Przemyslaw prusikiewicz (Univercity of Calgery) 2006 NRC

Canada


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inflorescences : Interactive

flower modeling using botanicalstructural 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)


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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


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Notions

Floral diagram An iconic description of a flowers structural

characteristics

To design individual flowers

InflorescenceA branch with multiple flowers and its branching

pattern represented in a pictorial form

To design many flowers


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Notions

Floral diagram Inflorescence


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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 :


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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)


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Overview


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Floral Diagram Editor

(a) Edior (b) Brassica Rapa (c) Ranunculus acris


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Floral Component Edit

sketch to

3D model transform alongcenter vein globaltransform localtransform


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Inflorescence Editor


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Result I


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Result II


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Result III


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Result IV


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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)


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Overview of the modeling process


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Initial sketch as hierarchical billboards


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Component representation


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Main edit window and an overview window


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Construction of an initial sketch


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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.


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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.


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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).


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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).


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Reusing a 3D component

Billboard replacement. The user clicks to select a component (a) andtarget billboards (b). The system then replaces billboards with the

specified component (c). Users may also double-click to select all sibl

ing billboards (d).


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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).


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Fitting a leaf object to the target skeleton


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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).


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Skeleton-based deformation of 3D components

Fitting the skeleton to the user-drawn stroke

R lt


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Result

R lt


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Result


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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 SimulationStudy

M i id


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Main idea

The postulate that existing pr imordia

inhibit the formation of new pr imordia

nearby.

Obj ti


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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 arobust manner

Ph ll t ti tt


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Phyllotactic patterns

M d l


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Model

M d l


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Model

Di f i hibiti


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Diagram of inhibition

Di f i hibiti


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Diagram of inhibition

I hibiti th h ld


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Inhibition threshold

I hibiti th h ld


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Inhibition threshold

Inhibition threshold(128)


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Inhibition threshold(128)

Example(Arabidopsis)


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Example(Arabidopsis)

Two inhibition functions


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Other method


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Other method

Other method


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Other method

Other method


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Other method


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Thank you!

20080917 zenglanling 3d plant modeling

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