Hi Anis, this is due to one of the rails being made up of 3 segments.

Currently MoI handles sweeping differently than Rhino in the presence of multiple segments.

If you use Edit/Separate on those rail curves, you'll find this small segment here:



Which as you can see corresponds to the problem area of the resulting sweep.


If you fuse those segments together into a single segment by deleting the control points on the ends of that small segment in the joined-together curve, the sweep should behave better. Also another alternative is to use the Rebuild or FitCrv commands inside of Rhino to fit one single segment to that multi-segment curve.

Network in MoI will also work better for this particular case because it has a similar kind of refitting process done on all of its curves internally.

I have an overhaul of sweep planned for a bit later on in v2 that should address these issues with sweep.

- Michael

@ Steve...

Are you using this technique ?



@Michael....
got it...

Hi Anis,

>Are you using this technique ?

For the construction lines yes.

For the G1/G2 blends (last 2 pics above), extrude the top circle to a surface and then blend with the the main body.

Hi Steve...

The problem is that the bottom surface is come from multiple curves ( check my original file on my first post ) :

Hi Anis,

>The problem is that the bottom surface is come from multiple curves ( check my original file on my first post ) :

Yes, but your original surfaces/curves are not good for later blending/constructions. Even in Rhino a 2 rail sweep using your curves will not give a clean/smooth surface.

Rhino:- 2 rail sweep:-



The problem is that the curves for the main body are not all connected to at least G1, so it will cause further problems, even possible problems with output for rendering. It is better for such a simple shape to use a circle or oval and then move the control points to create the correct shape as I did on the examples I posted.

Hi Steve...

I am never tried in rhino before, thanks for checked it.
When apply fillet i use "circular" ( see below ), I will try to use G1, G2 & G3 and see the result.

Below is the result use sweep 2 rails :