apart from a small list of reserved attribute names (like @P and @N) you need to tell houdini what type the attribute is. Replacing @mypos with v@mypos should fix things
That's where I'm confused. In the first wrangle, I use v@mypos. From that point on, everytime I use @mypos, houdini should already know it's a vector, right?
No, Houdini doesn't do type introspection in wrangles (or in most places that touch geometry attributes for that matter), so for each fresh wrangle you need to define the types again.
it works.
