Revit will sweep an object along a path. It does not yet have a sweep-blend
where an object sweeps along a path, and the geometry changes. This is a
request and will probably be included in an upcoming release. Is a
sweep-blend what you mean by "loft"?
"mmiles" wrote in message
news:23994443.1078948526379.JavaMail.jive@jiveforum1...
> I haven't used VIZ, so I cannot comment on the question about the loft
objects- I don't know what you mean.
>
> But, you can copy splines, and type in specific distances while copying.
Maybe that will help. As for why you cannot offset them, I don't know. The
same is true for Ref Planes.