Setting particle attrs

[BadG3r]

the first one is the way to go, but without the PP behind lifespan.

[darktding]

you want to use the same way it is used as in getParticleAttr...
something along the lines of...

setParticleAttr -at "lifespanPP" -fv 0 ($partName + ".pt[" + $partId + "]");

don't forget to set the life mode in the particleshape to lifespanPP.

[Aikiman]

thanks for your replies guys,

firstly I want it to be on a per particle level as I want each particle to die when it collides with a certain piece of geo. However looking at darktding's line of code would suggest for this to work but it seems to work on a scalar level and even then only once.

I have set my lifespan mode to lifespanPP yet when I made a creation expression for lifespanPP my script editor told me that the code within the proc couldnt connect to lifespanPP because it already had a connection, so I deleted the expression but got the same results as above.

Im not very good with procedures, I think that is where my problem is.

[darktding]

you are confusing between per particle expressions vs regular expression.
This is continuining from the events thread (http://forums.cgsociety.org/showthread.php?f=86&t=522778) on the dynamics section.
To be blunt - I HATE MAYA EVENTS - it sucks, it is a huge sham the alias team has made to justify for a feature, when all it is there is to bruise my forehead from all that banging on my head.:banghead:
Events use regular expression which is really buggy, and doesn't work and sometimes even crashes maya.
To be efficient about getting the result, you are on the right path - using per particle expressions.
Paste the following lines into the runtime before dynamics and you are set


int $index = collisionGeometryIndex;

if( $index == 0 )
{
print "we hit a \n";
lifespanPP = 0; // killing particles
}

if( $index == 1 )
{
print "we hit b \n";
}


You will notice I don't use the get/setParticleAttr, and it works more reliably than running regular event expression which sucks...

[Aikiman]

hey thanks man, that makes a lot more sense now. So in terms of particle expressions, there is no real need to call athe procedure? If it is a normal expression you do call them?


I empathise with the head banging, I have a sore forehead myself :)

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