2010

Table Of Contents
A key is created with the nParticle emission rate set at 50.
6 Play the simulation for five more frames to frame 55.
7 Set Rate (Particles/Second) to 0.
8 Right-click Rate (Particles/Second) and select Set Key from the context
menu.
A key is created with the nParticle emission rate set at 0.
9 Go back to the beginning of the playback range and play the simulation.
nParticles are now emitted until frame 55.
Adjusting nParticle collision attributes
nParticle Collisions attributes determine the behavior of nParticles when they
collide each other and with other Nucleus objects. In this section of the lesson,
you make the nParticles sticky like candy by adjusting the Friction and
Stickiness attributes.
To adjust nParticle Collisions attributes
1 In the Outliner, select nParticle1.
2 In the Attribute Editor, click the nParticleShape tab.
3 In the Collisions section, set the following:
Bounce: 0
Friction: 0.2
Stickiness: 0.5
4 Play back your simulation.
5 Notice that the nParticles are now sticking each other and piling up at
the edge of the bowl.
Friction and Stickiness are similar attributes in that Friction is a force
acting in the tangent direction, while Stickiness is an adhesion force in
the normal direction. When Nucleus objects collide, the affect of their
Friction and Stickiness values are additive. For example, if the Stickiness
value of the nParticles and the bowl are 0.5, the overall Stickiness acting
on both objects is equal to 1.0.
Adjusting nParticle collision attributes | 925