2010

Table Of Contents
represents an attribute scaling factor of 1. Setting a selected position to
0.5 sets per-particle radius to half the Radius value.
3 Click in the ramp to create additional markers and set the Selected
Position and Selected Value for the new markers to the following values:
Selected
Value
Selected Posi-
tion
Marker
0.1800.7322
0.4800.8823
1.01.04
For each point in the ramp, leave Interpolation at its default setting of
Linear.
4 To map nParticle Radius to the nParticles age, set Radius Scale Input to
Normalized Age.
When Normalized Age is used, per-particle radius is mapped within the
range of the nParticle objects lifespan.
5 To add randomization to the per-particle radius, set Radius Scale
Randomize to 0.25.
6 Play back the simulation.
You can continue to adjust the per-particle radius by adding more markers
to the ramp, or optimize the ramp values as the simulation plays back.
938 | Chapter 19 nParticles