You can create an Exclude Collide Pairs constraint for nParticle objects to prevent them from colliding with specific nParticle, nCloth, passive objects, or Nucleus object vertices.
To create an Exclude Collide Pairs constraint
For example, you can select two nParticle objects, an nParticle object and an nCloth or a passive object, or an nParticle object and a group of vertices on an nCloth or passive object.
If you select two nParticle objects, they no longer collide. If you selected an nParticle object and an nCloth or passive object, they no longer collide. If you selected an nParticle object and a group of vertices from an nCloth or passive object, the vertices you selected no longer collide.
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