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Closing Splines

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Raxx:
It's hard to tell what you're doing. So here's some information about splines and lathing.

It seems like you might be misunderstanding lathes and splines. The resulting mesh no longer has anything to do with the spline. So making changes to the spline has no effect on the lathed mesh that you previously made. You have to delete the mesh and re-lathe the spline if you make changes to the spline.

You don't have to close a spline to lathe it closed. In fact, if you do then it'll create extra geometry on the lathing axis that you don't want. Keep it open and make sure the closed option in the lathe dialog box is checked. This way it'll automatically close it at the poles.

If you want to cut a spline into two separate halves while maintaining its original shape, you can select the spline and go to Build->Convert to mesh. Then in point edit mode, select the edges of the first half and go to Build->Convert to Spline. Then select the second half's edges and go to Build->Convert to Spline. This creates two splines out of the original. You can delete the original spline and then individually lathe the two pieces.

When filling holes, you have to select the edges, not the points. You mentioned only points in your post so I'm mentioning this just in case.

When filling holes, the number of edges of the holes must not exceed 12 or else it won't fill holes. If it exceeds twelve then split the hole in half using the add edge tool until all holes have 12 or less edges. Then fill the holes. Select the resultant faces and merge faces (M) or Edit->Merge Faces.

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