I checked the docs, but unfortunately couldn't find anything yet. I wonder how to constrain grains together to achieve some mud/soil like behaviour (clumping) with vellum. Vellum creates the GEO and CON output, so how do I create the constraints? I managed to create attractionweight and -stiffness attributes on the grain particles (before GEO output) in order to come up with different behaviour.

Cheers
Tom

P.S.: If I transform (move) the GEO output, do I also need to move to CON output?

Ah, finally managed to do it.

After the grain_constraints node you need the vellum_constrains node with target_group_type set to points and constraint_type set to glue.