Sweep2 - Ruled surface

[Tom_P]

the most simple example for a ruled, but not developable surface.

_devLoft
is quite nice tool to create developable surfaces

you may also want to look at other topics searching for developable
for example here:

How to Unrolling doubly curved surfaces

Dear @prabath there is a geometrical background you have to understand: As soon as the gausian curvature is not 0 for the entire surface, it is not developable. As physical materials like cloth, rubber and even steel-plates can be compressed / expanded while they are formed, it makes sense, that CAD / rhino offers a function to approximates the 2d / flat representation that can be cut and later deformed. _squish is as far as i understand the most advanced command regarding those approximat…