Hi Naxos, I think that those lines that you are talking about are the edges of surfaces.
That's a part of how NURBS surfaces work - every surface is actually a 4-sided patch, although in some situations like a sphere some of the sides are pinched down to a point.
But on closed surfaces such as a cylinder, there will be an edge line on one part of the cylinder. This is the spot where the "seam" of the cylinder is - imagine that the cylinder is like a sheet of paper where 2 edges have been brought together to make a tube.
Is that the type of line that you're talking about? It is hard to get rid of them because they are basically part of how the geometry functions... I guess I could try to hide them or something.
Normally when you export to a mesh, those types of lines should not be visible in a rendering because MoI does a "welding" procedure that unifies mesh vertices in those areas. I believe that Steph turns off welding for this type of technical sketch rendering in order to purposely get accents along the original surface edges.
If you have an example you could post (including .3dm file) of the type of line that you're talking about it might help me understand more.
- Michael
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