Hey guys, need some help with an expression.

I have a handful of animated objects (moving in the scene one after another) with baked animation imported from max, I'm trying to setup a pop system to emit particles from points on those objects.
so far my tree looks like this: baked objects > merge > group(by pattern, i'm filtering the points on the objects i want to emit from) > group(by expression, here i need to populate a group with filtered points when they become animated/move in the scene) > pop network.

any help would be appreciated …
thx

a screenshot wd be a plus ..

here it is, and the simple scene file…

see attached

thanks.

This should work.

First a trail node to actually calculate v and then expression

length($VX,$VY,$VZ)>0.0

I second the last post, but there´s a cleaner way to do it (IMHO).
After the trail node on compute velocity node create an attribute (Point, float, 1 component) called however you like, let´s call it “vel”, and give it the value

vlength(vector3($VX,$VY,$VZ))

Now calling the variable $VEL you know the absolute velocity of every point. You can create a group with the expression $VEL>whatever number, and now you are grouping based on velocity, and you can check the vel attribute from the spreadsheet to see how fast your points are moving.