2010

Table Of Contents
Notice that the nParticles are not falling from the candy package as
quickly as you might expect. Instead, they fall slowly, as if the simulation
was playing back in slow motion. This is because the Nucleus solver
properties need to be adjusted to suit the simulation.
In the next section of the lesson, you set Nucleus solver properties so
that the particles fall realistically.
nParticle and Nucleus nodes
You have now created all of the objects for your Nucleus dynamics system.
The following section describes each Nucleus system node.
nParticleShape1 is the node that carries all the nParticle object attributes that
define the appearance, size, and overall behavior of each particle in the
nParticle system.
Emitter_Smoker1 is the nParticle emitter node, which carries all the particle
emission attributes such as particle emission rate and emitter type.
nucleus1 is the Maya Nucleus solver node, which carries all the attributes
affecting the solver system including internal forces.
nRigidShape1 is the passive object properties node which carries all the passive
collision object attributes.
Setting Nucleus Space Scale
Adjusting the Nucleus solver properties is an important step of creating an
nParticle effect. The Nucleus solver properties control internal forces that
affect all of the nodes that are members of a solver system. One of the most
significant Nucleus solver attributes is Space Scale.
The Nucleus solver applies Gravity and Wind forces to objects as if the objects
were scaled in meters, regardless of the units in which your scene was created.
To maintain the effect of real world gravity, you need to adjust the Nucleus
Space Scale to suit your simulation.
To set Space Scale
1 In the Outliner, select nParticle1.
2 In the Attribute Editor, click the nucleus1 tab.
3 In the Scale Attributes section, set the Space Scale to 0.01.
922 | Chapter 19 nParticles