nParticles is a particle generation system that uses Maya® NucleusTM, the same dynamic simulation framework that generates nCloth simulations. An nParticle object natively collides and interacts with other nParticle objects, as well as with nCloth and passive collision objects. nParticles can also self-collide, meaning that particles from the same nParticle object can collide with each other.
Nucleus dynamics allows you to create particle effects and dynamic simulations that cannot be achieved with Maya classic particles. For example, you can use Liquid Simulation attributes to create particle systems that behave like liquids. You can also create effects in which particles interact and drive nCloth animations and deformations.