Hi Steve - so in a case like that if you want to use Blend you have to split up the long edge into pieces so that you'll have a 1-to-1 match between edges on both sides.

You can use the Edit > Trim command to cut an edge up into smaller edge pieces - select the edge, run Trim, then click the "Add trim points" button and then you'll be able to click the points on the edge where you want it to be split at.

I will be working on upgrading Blend in v3 so that you won't need to do that anymore, but for now you've got to arrange your edges so that there is a matching pair of edges.

- Michael

Another thing you might do to make things easier would be to take this curve here which is made up of 3 segments:



Join those together and run the Rebuild command on it
http://moi3d.com/2.0/docs/moi_command_reference10.htm#rebuild

You get those additional edges in your original one because the curve that you were extruding was made up of several segments - the segmentation of the curve will come through into surfaces that you construct from it, with one face for each segment of the original curve.

So you can eliminate those interior edges by reforming the curve to be made up of just one single smooth segment instead of being multiple segments - the Rebuild command is the easiest way to reconstruct a curve like that.

Then when you extrude it, you'll see it's just one surface instead of multiple faces:



- Michael

Thanks very much Michael,

Interesting............I give this a go :)


Cheers
Steve

Hi Steve,

I have attached my approach based on your example.
Yust hide the solid and switch on the controlpoints with the Show pts command.

What i did is projected the blue lines on the shape.
Then trimmed the curves at the border and turned on the controlpoints
With Line/both sides command(see green lines)snapping on the endpoint of the mastercurve(orange) and the nearest controlpoint.
I switched on the controlpoints of the cyan colored curves and snapped the nearest controlpoint on the green lines.
At last i used Sweep/two curves.

Ps. You can play with the rebuild command(R shortcut key) to add or reduce control points.

Hey thanks my friend, very good of you to do this

Much appreciated

Steve