The density channel is not populated by PFlow/Thinking Particles in
the general case. The initial value per particle is set to 1.0, then
scaled by the transparency of the material, and the Visibility
controller from the node in the scene. The renderer itself has a
number of settings for influencing density at render time.
The exceptions to this rule are custom channels using Box 3, MAXScript
operators, or the MXSFloat channel when using PFlow. When using
Thinking Particles, the density is seeded with the value of a custom
channel named Density if it exists.
Hope this helps.
–
Darcy Harrison
3D Software Developer
dharrison@franticfilms.com
Frantic Films
300-70 Arthur Street
Winnipeg, Manitoba
R3B 1G7
Canada
204.949.0070 P
204.949.0050 F
http://software.franticfilms.com/