Field Force + Volume - how to make it work this way

[PSCGI]

Hi,

I would like to create similar effect to the one that Noseman did in this tutorial:

https://www.youtube.com/watch?v=OwgEm525oog&t=109s&ab_channel=MaxonTrainingTeam

But instead of emitting particles from the object's surface or volume. Let's say we have letter S:

1. I would like to emit them from a different place (eg. I'd like a basic emitter in the top right corner)
2. Then I would like my particles to enter the volume of my object (S) but in a nicely distrubuted fashion, not sucked in to 1 place inside that object. Or let's say I would like them to enter the volume of the object from the top
3. And then I would like them to start swirling inside - in exactly the same way like those particles that were born inside (like they were in that tutorial).

I've tried a few different setups but the particles either get inside but don't make such nice twirls (like those ones that were born inside the object) or they bounce off the sufrace of the object or slide along it... I'd be very thankful for helping me with this effect, thank you.

[Dr. Sassi]

Hi PSCGI,

I believe that doing it reverse is a way to go, as the distribution in the letter is mostly even, as shown in our Quick Tip.

My tip produce Particles inside the letter and animate those in any way you like. Have a multi-segment spline with starting points all over the Object that contains the particles and their movement.

At one point lower the animation force, and perhaps switch off the Collider. While a little bit earlier, start with a Follow Spline. During the start, set Follow Strength to zero, start shortly with a negative value, then slowly increase to positive (Alternative, use the Mix slider, but there is no negative). If the animation looks right, cache it, then use the Time Mapping for the cache, perhaps just right mouse click, and use Flip Horizontal.

The Time mapping also allows for fine-tuning the animation timing, perhaps a good option to get a good dynamic into the mix.

Here is a simple sketch, perhaps that triggers some new ideas.
CV4_2025_drs_25_PAip_01.c4d
and an example with "Mix" and more along the QuickTip, cache it then reverse.
CV4_2025_drs_25_PAip_11.c4d
With cache, etc
https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_PROJECTS_DRS/20250721_CV4_2025_drs_25_PAip_21.c4d.zip
All the best