chdh Egrégore - Source

An audiovisual software transcription of the chdh performance realized in 2011 that exploits the group movement phenomenas. Egregore - source is an edition that aims to archive and document the performance: all the elements in égrégore - optimized for a standard personal computer - are supplied: the instrument created for the performance, the software that enabled the creation of the performance and a document of usage, all under a free license and with source code.

INSTRUMENTS DESCRIPTION

Mouches
Mouches (flies in french) is a simple mix of noise and random movements. Every particle movement is random and independent. The sound is based on noise generators. The control are divided in two groups of flies.
* random group n : amplitude of random
* low pass group n : property of the random generator
* high pass group n : property of the random generator
* scattering : visual dispersion

Emergence
In emergence, every particle is connected to all the others. The modification of the link between them creates emerging complex structures. Sound synthesis is based on the speed and displacement of particules.
* pentagon, explosion, ...., unstable : different kind of connection between particules 
* native velocity : increase the base speed of particles
* sound synthesis : mix between three sound synthesis engine

Chaos
Chaos is based on the Peter de Jong strange attractors family. The input of this attractor is a mix of different simple sound synthesizers. A few iterations of the attractors are computed for each of this sound samples, resulting in tables that are directly seen as sound and particule positions.
* bass, medium, ..., sawtooth : sound at the entrance of the attractor
* wave shaper : effect on the input sound
* phase variation : movement variation velocity

Morphing
Morphing is defined by a set of 377 mobile particles attached to different shape composed by 377 points: circle, square, .... The user can modify the rigidity between the mobile particle and each one of these shapes, resulting in mixed and unstable forms. The particule positions tables are directly read as sounds.
* sinus, square, ... grid : attraction to each shape
* random : add a random position
* damping : modification of the "resistance" of the environment

Fluide
Fluide is more an effect than a proper instrument. It takes as an input the position of the particules of the other instrument and "throw" them like bowls in a 3d topology. The sound is based on the particules displacments.
* input attraction : influence of the other instruments particules position
* damping : resistance of the environment
* image n attraction : influence of the 3d topology
* sound synthesis : mix between three sound synthesis engine

 

377 particules. Each particule is controlled by the five instruments, the resulting movement is the sum of the displacements generated by all the instruments. These instruments are mostly based on physical modeling and chaotic equations algorithms, resulting in expressive and pseudo naturals behaviors. The instruments play on the relationship between the particules: some of them used totally independent generators for each element, and some connect all the particules together.

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