Hi Gunter,

re:
> Is it to just restrict the lattice from stretching?

Yes, because in surface-to-surface flow mode it will match the entire base surface to the entire target surface.


> Why is this not needed when you use curves as I did before?

Curve-to-curve flow has a "stretch" option that you can turn on or off unlike surface-to-surface flow.

In curve-to-curve flow when "stretch" is off it will match distance traveled along the curves. But it's difficult to have that type of matching in surface-to-surface flow because there isn't just one direction anymore, a surface can easily stretch or compress to different widths at different spots along it.

- Michael

Hey Michael, Thank you for taking the time to explain this, I get it now.
Much appreciated

Your line is 20
If i take a part of circle of 20
Flow the part Line to Part of Circle will give the result wished! ;)

In fact the Flow method can support some styles of results! :)
Depend of what result wanted with Line, Surface, Volume...
...and where are the different items
Line - Line : strict ... volume follows line
Line - Surface : can be degressive ... volume can enter inside the surface
Surface - Surface : Strict ...volume follows the surface