Kaushik Pal

Set “mass” attribute to 0 for the points you want to pin. This works as a hard constraint. For soft constraints you need to set “targetP” and “targetstiffness” attributes. Do check out the example files that ship with Houdini for PBD. Also read the help docs for better explanation.

Try the foreach sop maybe?

Try the file I uploaded. It should fix the issue.