Hi all

i have been trying to make a wall fracture as per a punch and then have smoke and debris come off of it, but at the moment smoke comes off of everything all at once ,as a fix i have deleted the points of the debris sim that are not on the fracture but that seems like a very dirty way , and it might bite me in the rear, this is the first year i have touched houdini and didn't start till later in the year so i am still a complete beginner , i have compiled the scene so far from a mish mash of tutorials and how i understand it to work, i have attached my hip file and also the abc of the punch rotomated to a sphere.

any help will be appreciated

Just isolate the interior edges of your shards, then isolate them further based on velocity, and use that to source your smoke/debris