Initial implementation of PhysicsEngine and ParticleCloud.
Refactor Vector3D
More particles, more fun!
Create InputProvider interface and an example implementation of
SpectrumProvider.
Merge remote-tracking branch 'origin/input-provider' into particles
Refactor ParticleCloud. Fool around by mapping spectrum to particle
sizes.
Refactor particle rendering.
Refactor SimpleFollowerParticleCloud update method.
Merge pull request #3 from jukkae/particles

Refactor physics, particles and particle rendering