That is irrelevant and you are wasting the time of the people who were trying to help you. Bye bye.
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the issue is that you are not explaining any of your further steps, maybe your idea does not work out generally, maybe there is a different approach, so people are guessing around trying to fulfil an obviously not possible wish.
looking at your curves your āDeck Edgeā Curve is already a joined curve with 3 segments. so in that sense it is already cut. or maybe i am misunderstanding it.
either way one more method would be to split the curve at the tip and use Sweep2. you will get a non trimmed surface, but you have a singularity at the end.
Just tell me that the surface Iām asking for canāt be done even in Rhino with two curves and trimmed IGES. The rest is a bit arrogant and not humble. For me, itās not irrelevant. Itās something I need to save time. But letās leave it at that. Iām not asking for anything more on this matter.
Exactly. There is still no tool to create that type of surface without trimming. The only way is to do a loft that ends at a point. I thought so, but this discussion has confirmed that itās not possible yet. Hopefully, a helpful tool will appear in future versions.
Thank you all very much for your time.
A fundamental property of NURBS surfaces: Every untrimmed NURBS surface has four sides. Zero, one, two, three or four of those sides can have zero length by stacking control points.
The solution @encephalon showed above is untrimmed, exactly matches the edge curves, and has one zero length side.
An alternative is use EdgeSrf with the four input curves, and then move the control points to flatten the deck (assuming the deck should be straight transversely). This solution has no zero length edges but has two singularities with the u and v directions coincide.
Surface Deck DC01.3dm (1.9 MB)
No control points of trimmed surfaces are āhiddenā. All control points of a trimmed surface are visible (unless the view is obscured), selectable, and can be moved, etc.
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the sweep2 solution as shown is untrimmed.
if that does not satisfy your purpose maybe just provide more information already what your exact issue here is. an entire group of experienced people trying to help is obviously not enough to unriddle your intentions.
This was a painful readā¦
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the entire topic has served more purpose than ever asked for.
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After working with 3D CAD since autumn 1990, Iād still like to learn about the double top secret software that cannot properly import trimmed surfaces via IGES.
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Iām on a similar timeline, I have known that IGES files are readable text files since about then. All this is basic, amazing all the time that people have given and the rejection that it got!
My CAD career started building snowboards in 1988, and wrote the first parametric definitions to automate it two years later. I have seen this exact trimmed surface thousands of times, starting over 38 years ago, time flies! 
1990, about the same time Autodesk decided that anyone using an IGES exporter must be a professional user and made that export file type a seperate $700 dollar purchase in release 9 or whatever. Burned me on that company forever. Jumped ship at my first chance.
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Yes,
Thatās right
I need split the Edge at the end as you show in the pic.(CL Deck Bow) May be Is the only way to do a ābetter trimmed IGES Surfaceā. Very good contribution.
I just have one question about how to get the best surface with āRebuild Edge Curveā with 25 Point Count.
1.- Swep2 curves,
2.- Surface from a network of curves
3.- Surface from 2 curves.
NetworkSrf usually (always?) rebuilds input curves.
Do you mean Loft?
When Loft is used with two input curves the surface will have straight lines connecting the two curve. Which points on each curve are selected depends on the structure and parameterization of each curve.
EXPERIMENT
Before jumping to the forum try it yourself. You can always delete the results.
If you want to know the difference between two different approaches try both and compare them.
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