3D Plants Modeling Reporter: Zeng Lanling Sep. 17,2008
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
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)
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
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
Notions Floral diagramInflorescence
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 :
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)
Floral Component Edit sketch to 3D model transform along center vein global transform local transform
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)
Overview of the modeling process
Initial sketch as hierarchical billboards
Main edit window and an overview window
Construction of an initial sketch
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.
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.
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).
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).
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).
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).
Reusing a 3D component Fitting a leaf object to the target skeleton
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).
Skeleton-based deformation of 3D components Fitting the skeleton to the user-drawn stroke
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
Main idea The postulate that existing primordia inhibit the formation of new primordia nearby.
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