RadiusPP

[tempo3d]

Ok, I couldn't figure out how to control the maximum radius for individual particle taking into the account that particle radius at the moment of birth. But I ended up with simple runtime expression that looks like this:

if (frame <= 30)

particlesShape.radiusPP = particlesShape.radiusPP * 1.1;

The rest is just to find multiplier for radiusPP wich is currently 1.1
It would be great if I could control the maximum particle size based on percentage of radius at the moment of birth. So IF statement would be something like:

if (frame <= 30 || particlesShape.radiusPP <= 400% of the size it was born)
.....

[Als]

Create another attribute per particle, and in creation expression give it random value as you wanted so for example
maxRadPP = rand (20,45)
and make start value as value in similar fashion so something like
minRadPP = rand ( .1, 1)

and then make some runtime expression like:
radiusPP = smoothstep ( 1, 31, frame) * ( maxRadPP - minRadPP);



Als

[Xsiv]

Ok, I couldn't figure out how to control the maximum radius for individual particle taking into the account that particle radius at the moment of birth. But I ended up with simple runtime expression that looks like this:
....



You can control the max particle radius based on the relative size of the particle at the moment of birth, by taking the percentage of the size of each particle as they are born, relative to the MAX size they can be.

You need to create new PP attrs - or variables, whichever you prefer:

radiusNewSize = rand(20,40);
random_radius = (0.1,1.0); //gives a random radius (Rmin,Rmax)
radRelativeSize = random_radius/1.0; //random_radius/Rmax which gives you the percent size of the particle

now, you have to figure out how long into the particle's life 31 frames is...
do you know?
Otherwise, if the event you are going for, always happens at frame 31, then it is like this:

if (frame >= 31)
radiusPP = radiusNewSize * radRelativeSize * radiusPP;
else
radiusPP = random_radius * radRelativeSize * radiusPP;

Have fun...

[alexx]

a quite easy solution for what you need is using a PP creation expression and a ramp:

create a PP attribute called: initScalePP
give it a creation expression like: initScalePP = rand(20, 45);

now create a PP ramp: rampScalePP

create a runtime expression:
radiusPP = initScalePP * rampScalePP;


with the ramp you can no control the overal size and the particles still are randomly sized.

cheers

alex

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