Re: Is it Possible to Animate The End Key of a Particle Age FCurve During a Sim?

["Vince Fortin" <vfortin(at)gmail.com>]

Hi Julian, here's how I'd do it:

1) Create a new float User Parameter on your PType and call it "alphaLimit".

2) Create a pEvent called "BIRTH" (Particle Age % 0, Per Trigger Particle, Jscript)

// Just point to an up-level parameter if you want to animate this value over time.
inParticle.Attributes("alphaLimit").Value = 100;

3) Create a pEvent called "RUNTIME" (Every 1 Frame, Per Particle, Jscript)

var alpha;
var age = inParticle.age;
var alphaLimit = inParticle.Attributes("alphaLimit").Value;
var color = inParticle.color;
// This is the simpliest way to script it, although it's a ll linear.

alpha = 1 - (age / alphaLimit);
color.alpha = alpha;
inParticle.color = color;

Is that what you're looking for?

 

Vincent


On 4/26/07, Julian Johnson <julian(at)exch.demon.co.uk> wrote:
> I'm trying to figure out a way to animate the end key of a Particle Age
> FCurve attached to my particle's alpha so that through the course of the
> simulation the rate of the alpha curve (from 1 to 0) becomes quicker.
> The idea is that the lifetime over which the particles dissolve becomes
> quicker over the sim.
>
> I've tried a simple scripted op on the ptype using the SCOP Wizard:
>
>    oAlpha = Inoriginal.Value.Parameters('Alpha')
>    oCurve = oAlpha.Source
>    oKey = oCurve.Keys(1)
>    #do sundry stuff to the key (ultimately tie in to animation time)
>    oKey.Set(oKey.Time,oKey.Value + 5)
>    return
>
> But the script seems to fail at oAlpha.Source.
>
> In isolation, from the ScriptEd, the script basically works:
> oPType = Application.GetValue('ParTypes.original')
> oCurve =  oPType.Alpha.Source
> #do sundry stuff to the key (ultimately tie in to animation time)
> key =  oCurve.Keys(1)
> key.Set(key.Time,key.Value -.2)
> print key.Time, key.Value
>
> Anyone have any ideas :-) ?
>
> Julian
>
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