Per vertex attributes in OTF objects?

[stefs]

Is there a mechanism in Vizard to load user defined per vertex attributes in on-the-fly (layer) objects?

I need color, normal vector and tex-coord already. So I can´t use those to store my additional attributes.

In a previous thread about bump mapping I read something about that Vizard supports tangent and binormal calculation. Can I access (i.e. write to) the tangent and binormal attributes from my own vizard app.? If possible, it would be a temporary fix to the problem.