Hi andras, like Paolo mentioned above it is possible to use Blend for that if you split up the closed part into pieces, so that there is a one-to-one matching of edges.

But you don't actually need to split all the surfaces up, you can just split the edge only into small edge pieces by selecting the edge and using the Trim command with the "Add trim points" option to place the dividing spots in.

After you have split the edges you can then pick pairs of edges between the 2 pieces and use Blend.


But it can be better to use a more structured approach (something like sweep or network with some additional guide curves) than Blend when trying to make something between pretty different shapes.


In the future I do want to improve Blend so that it will be able to work on a series of edges directly inside of Blend rather than only between a pair of them.


- Michael