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

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

Are you using the code from the sample scene?

I'm using a null to hold the up-level animation. The name of which is hard-coded in the first pEvent.

If not then I can't tell, make sur Jscript is switched on!

hope this helps

 

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

 

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 globally.

inParticle.Attributes("alphaLimit").Value = 100;

 

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;

alpha = 1 - (age / alphaLimit);

color.alpha = alpha;

inParticle.color = color;

 

This should be the simplest way to script it. However the alpha animation over life is linear.

On 4/26/07, Julian Johnson <julian(at)exch.demon.co.uk> wrote:

Vince Fortin wrote:
> 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?
>
Hi Vince,

Thanks very much for the help and the sample scene. Your scene works
perfectly here and it's really clear how to set it up :-). It seems like
a really elegant solution...

In my own scene, I guess I'm screwing something up because although I've
input the relevant parameter and events into the PType, I'm currently
getting an error: #ERROR : Object required - [line 12]. I just need to
dig around for some obvious syntax/transposition error I've made.

Thanks for the pointers, again. Very much appreciated.
Julian


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