Hi Paso,
> EDIT: please take a look at the attachment, thats the
> shape, but how do i get rid of those yellow lines?
Is there a reason why you want to get rid of the yellow lines?
Those are edges of surfaces that you have created - it is not an error to have edges, edges are always present on every surface that you create.
For closed surfaces it is normal for there to be a "seam" edge where the surface is closed.
NURBS surfaces are kind of like rectangular sheets of rubber. The sheet can be stretched and pulled in different ways, but to build a closed surface like a cylinder that is done as if you had taken a sheet of paper and rolled it up so that left and right edges were meeting each other. There will be an edge displayed in that area, it is a natural part of the surface and not an error or something that you need to get rid of...
For some kinds of construction methods you may get edges in areas where you use curves that are made up of multiple segments.
If you want to reduce the number of edges in cases like that, you can merge segments of your curves together by using Edit/Show pts to turn on control points and then select and delete the point where 2 segments are touching. That will fuse them together into a single segment.
A segment is one piece of a curve, like for example a rectangle is a curve made up of 4 line segments. You can use the Edit/Separate command to break a joined curve into individual curves for each segment, then they will select individually so you can see the segments that way.
But in general it looks like you have created your shape successfully and you should not really worry about those yellow lines unless there is some other problem with the shaping of the surfaces in that area.
- Michael
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