Can you elaborate a bit more on what you mean by multiple pipe diameters? Are you talking about assigning different pipe diameters to different curves or varying the diameter along each curve (like a loft).
for example if you take a single curve and want to specify diameters for start, midpoint, end, etc like you can in with the Rhino "pipe" tool, can this be done easily.
for now i have resorted to creating multiple circular profiles of different diameters and normal to different points along the curve and have lofted them.
yeah, i too want to adjust individual pipes to have a smaller starting and ending radius and a fatter center radius, growing as it flows along the crv. thanks for the help!
As it didn't seem to get answered here, I'll suggest the sweep1 method. Supply three circles start middle and end to a sweep component and it produces identical results to the pipe command in rhino.