References ParticleList::IMPACT_GRAVEL_ENTER, ParticleList::IMPACT_GRAVEL_EXIT, ParticleList::IMPACT_GRAVEL_RICOCHET, EffBulletImpactBase::SetEnterParticle(), EffBulletImpactBase::SetExitParticle(), and EffBulletImpactBase::SetRicochetParticle().