How do a soft selection

[nomad]

How can I create a soft selection in TyFlow? I want to apply a force gradually across a particle system. I tried using the Surface Test operator with 'Volume Inside,' but it only gives an on/off result — there's no gradual transition. Is there a way to achieve this? I imagine it might be possible through a mapping channel, but I haven't been able to find any examples.

[d4rk3lf]

There is maybe a better way, but you can make force gradually affect particles based on distance from the object with slow operator.
Here is I quick example I did.

https://www.youtube.com/watch?v=obz-BwGsS9U

In above example, they are born  on cylinder, and slow operator is making them soft selected based from the distance of sphere.

In the attachment is the file.