# How could a loft object be closed?

In this answer you can use two or more curves to generate a loft mesh with geometry nodes, but answers in this thread work for an open surface.

What could be a good approach to close the loop?

• Dang! I knew I should have finished this one up. Until I get to it, you could perhaps trim all curves 0-1 to split them, work with the split curves, weld back at the end? Haven't fully checked it out for reliability. Commented Sep 15, 2023 at 8:40
• what about simply putting the first and last "column" on same position and then merge by distance? Commented Sep 15, 2023 at 10:24
• If you want to just close it, can't you spawn a cylinder with matching vertices/edge loops numbers and sample positions by index? Commented Sep 15, 2023 at 10:42
• @RobinBetts ... yes I think it is version reason ... but like I wrote it is not a necessary to make it for old version (even 3.6 becomes old early :) ) for me is this more a study case that I would like to know how to handle it in a future (it is not a project that has to be done yesterday :) but thank you for a quick response :) what a Saturday morning :) Commented Sep 16, 2023 at 8:56
• @RobinBetts ... I got to v3.6 ... works great :) ... just a Trim Curve node ... hm ... Commented Sep 16, 2023 at 17:09

1. Duplicate the first spline as the last:

1. Increase the $$x$$ resolution of the Grid, to add this one missing column (could be done without step 1, but then you would need index remapping, and this way indices match again):

1. Change the UV domain to Face Corner, since now you have a column of vertices that are supposed to be both the beginning and the end:

1. Merge by Distance (if you don't want to, you also don't need p. 3.):

Result:

• Thanks ... it works great ... just curriouse the Cylinder way didnt work for you? BTW Face Corner want set before already? If Robin is going to post answer here it would be a dilema :) Commented Sep 16, 2023 at 17:43
• Thanks, Markus.. I've got a stinking cold / man-flu at the moment, so haven't been able to put the time in. Much appreciated. @vklidu, only difference between this and the trim method is that supposedly the trim will handle mixed cyclic and acyclic? But that has other UV problems of its own. Commented Sep 16, 2023 at 17:47
• OK will test it ... if it will be reasonable to create answer later for others ... mainly get well soon :) ... man-flu is serious thing, I know that ... Commented Sep 16, 2023 at 17:57
• @vklidu I didn't use the cylinder option, because in 3.3 it doesn't generate UV Map. It would look this way: i.imgur.com/XGQJm1Y.png unfortunately you can't increase top/bottom fill segments. Commented Sep 16, 2023 at 18:15
• @RobinBetts my terrible man-flus ended when I started supplementing iron, apparently most of the population have a deficiency (I've seen a research on magnesium, a carrot today has 10-20% of a carrot a century ago, I imagine it's very similar for many other elements), but obviously one needs to avoid overdosing iron. Commented Sep 16, 2023 at 18:24