How to create a Force object? Thanks……

You can't, it's a holdover from earlier versions of Houdini and is kept there for backwards compatibility. It *really really* needs to be removed from Houdini, IMHO, as it's understandably confusing and worse, the docs don't reference this, apart from a broken link to the help on force objects! At the very least a quickie docs page should be where the Force Object info should be.

You can just use the Force Pop without referencing a source location, since effects like gravity are universal. The other Pops that have the Force option also have the ability to enter a location in space.

Cheers,

J.C.

The Force Object had 3 modes, Force/Fan/Constraint. The Force mode is just a uniform directional force which is easily controlled with the parms on the Force POP. There is a Fan POP so the Force Object's fan mode is redundant. Finally there is constraints. This was for the old RBD system and you should be happy its not there anymore. Use DOPs instead. So aside from the confusing parameters you aren't missing any functionality.

If you *really* want to see what all the fuss is about in the textport you can do
opcf /obj
opadd force