Plants as Hierarchies of Objects CS 658 “Invasion” by Giles Tran at www.oyonale.com. Plants from xFrog

Objectives Practice reading and understanding a paper Explain difference between p-graphs and i-trees. Given a p-graph, construct the i-tree Compare and contrast L-systems with Lintermann’s approach. Reason about how Lintermann’s approach might be made adaptive to a given environment.

What problem are they trying to solve? From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Who cares and why? From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

What have others done and why is that inadequate? From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

What have others done and why is that inadequate? From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

What are they going to do to solve the problem? From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

P-graph and I-graph prototype graph which is traversed to produce the I, or instance graph. instance graph

P-graphs and I-trees From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Multiplication in Nodes Geometry with multiplication built-in Just multiplication

Geometry Nodes Geometry Geometry with multiplication built-in

Plants as Hierarchies From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Plants as Hierarchies From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Plants as Hierarchies From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Plants as Hierarchies From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Simple Example

Simple Example

Simple Example

Simple Example

Another Example From Lintermann and Deussen, “Interactive modeling of plants” in IEEE Computer Graphics and Applications, Jan/Feb 1999

Examples Gilles Tran at http://www.oyonale.com

Questions As intuitive as procedural methods? As powerful as L-systems? How would you make it adaptive in a given environment? Competition for light? Competition for space? Wind?