The motivation for following a graph-grammar-based approach in functional-structural plant modelling is discussed, and basic features of the language XL as well as of the underlying formalism of "Relational Growth Grammars" (RGGs) are presented. Some ideas for models are outlined which are given to demonstrate the potential for multiscaled modelling in XL.

Stephan Rogge: Using GroIMP to visualize trees

To visualize a park landscape in VRML it is necessary to investigate methods of modelling trees and to represent them in such a VRML model. GroIMP can be used as a tool to build tree models and to represent them. This talk demonstrates the process of building a tree model by using the example of a specific black alder tree (Alnus glutinosa) located in the Branitzer Park near Cottbus. The presentation shows the main ideas and the realization.

Gerhard Buck-Sorlin: Creating virtual roses with GroIMP

The progress of the Virtual Rose project is presented: The current plan foresees to create an FSPM of a cut-rose system, which predicts the temporal dynamics of the quantity and quality of flower production in an intensive greenhouse culture setting. The GroIMP environment is used to simulate both the rose FSPM and a virtual greenhouse as a set of interacting functional and structural modules. Special emphasis is put on the simulation of bud break as a function of hormonal signalling.

Jochem Evers: Modelling phenotypic plasticity in the 3D structure of plants

Phenotypic plasticity is the ability of an organism of a particular genetic make-up to adjust its phenotype in response to environmental fluctuations. Plasticity results from a chain of events, starting with perception of environmental cues, production and transport of signals and resulting in adaptations in plant structure. This research will focus on plastic responses resulting from intra-specific competition for light. Using the modelling platform GroIMP, physiological processes that underlie plasticity in plant structure will be integrated in a Functional-Structural Plant model, focussing on rice and wheat as model systems.

Ole Kniemeyer: Modelling ants in GroIMP

We present a simulation of artificial ants which communicate by pheromones and, in doing so, find short paths through the food sources of the virtual world. Using this model, we explain several useful features of XL, among them graph queries, selector functions and the true graph structure, and we show how a nice visualization can be obtained on top of the model.

Axel Hoppe and Jan Dérer: Plant modelling in computer games

The presentation gives a current overview of plant modelling in computer games and an outlook of using GroIMP for modelling in computer games. The state of the art in modelling in computer games is widespread – from handcrafted models with 3D Studio MAX to engine-based construction of models or toolbased modelling. The aim in computer games is to produce an even more realistic impression than now. How can that be realized? We give an outlook of how GroIMP could be used to create more realistic environments in computer games.

Thomas Huwe: GPU-based path tracing in GroIMP

I present a path tracer using the GPU of a consumers graphics card to render images. It is implemented in Java and GLSL using GroIMP as modelling platform and runtime environment. The path tracer is capable of rendering primitives like sphere, cone, cylinder, box, and parallelogram. Procedurally generated materials as well as textures can be applied to those objects.

Last modifications: May 14, 2008

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