GEVA is an implementation of Grammatical Evolution in Java developed at UCD's Natural Computing Research & Applications group. As well as providing the characteristic genotype-phenotype mapper of GE a search algorithm engine, and GUI are also provided. Currently a variable-length integer encoding Evolutionary Algorithm search engine is provided.
DrumBalls was the winning project of GEVA Week 09 by James Murphy. When a Sounder Ball strikes a Drum Ball a drum sound is generated. GE was used to evolve ball motion patterns to generate a desired rhythm. The short video demos the application.
As part of GEVA Week 08 James Murphy evolved a controller for a Hamster Ball by applying forces to the ball to steer its path through a maze of falling blocks. The number, order, size and direction of the forces to apply were evolved using Grammatical Evolution and ODE adopted as the Physics Engine. The short video demos the application.
As part of ODCSSS 08 John Reddin developed the Elevated Pitch software which used GEVA to automatically compose music. A sample of evolved music is provided.
Evolving a Logo Design
The NCRA group logo was evolved using Grammatical Evolution using a Lindenmayer system grammar and output in the Postscript language. The resulting work was published in IEEE Congress on Evolutionary Computation in 2008. An alternative implementation is provided as a demo problem in GEVA. A poster describing the Logo evolution is provided.