I'm in the process of creating some invisible sittable props in order to be used in conjunction with third party ones that, at least theorically should have this attibute. By using the information in an old thread, I've managed to create and make work two variants of an invisible chair (well, a cube in fact) with the SITTING attribute defined, that enables the "ask question" postures, but not other I'm interested in, such as those available for sofas and other categories of sittings.
I've tried to use other related attributes, but what I get are some weird effects. Is there any reference available for the use of these attributes? Thank you.