nParticles and AiRandom

Getting random colors per frame?

Particles have a unique identifier called “nodeHandle”.

• Using aiUserDataInt
  • attribute “particleId”
• aiRandom
  • type : color
  • Plug aiUserDataInt into the aiRandom color
• TIP: Using a aiRange to take the Red from the Random and range it.
  • Example range Red float 0-1 to 0-7 for things like switch nodes

What this does is takes the particle ID ( Number could be in the millions) and uses that to drive a random number. The aiRandom outputs a Red value of 0-1.

https://forums.autodesk.com/t5/maxtoa-forum/how-do-i-avoid-color-jitter-to-animate/td-p/11043979