Accessing per-particle attributes

[phalimjinx]

Anyone know how I can access a given particle's per-particle attribute to be used in an expression?

For example, if I want to drive an object's translate using a certain particle's custom rotational value... or particleId... or velocity... etc.

[joojaa]

Theres something terribly wrong with the question, . But obviously you can use the value form withinthe perticle expression like this:

if (particleshapeobjectname.id == theIDYouWantToUse){
  object.attr = particleshapeobjectname.whatever;
}

[phalimjinx]

Thanks Joojaa!
I'll try it. I didn't realize you could write expressions for objects on separate nodes! I thought it had to be written on the affected object's node.

When you say "Theres something terribly wrong with the question" what exactly do you mean? Are you referring to the taboo of using particle attributes with non-particle attributes? My understanding was that it was just a slow way to do it, but it still works. Is there more to it than that? Is that even what you are talking about? Please help me by explaining. Since I'm still learning, I definitely don't want to pick up bad habits. I'm pretty dumb when it comes to this scripting and expression stuff. Is this something I don't want to do?

Thanks for the help!

[joojaa]

No done thisway is perfectly ok*. Done with mel is slow yes.**

*in fact theres a curious undocumented behaviour of particle expressions, if you ask for values of another particle node you get the value for the same id for the other node. Which means that a dynamic expression node is JUST like a expression node with the exception thet its wihin a for loop, and each particle value is unpacked one at time into the same expression diving context as otherwise. Since obviously theres no dirtying problems with thsi behaviour it will work as afast as anything else.

** it is pretty easy to make a node to connect the values trough too if you wish.

[phalimjinx]

Thanks Joojaa!
You're awesome.
-P