Combining two separate meshes

[_Aka_]

Hi
The Spline to Mesh tool uses LibTessDotNet library to tesselate spline. When you use the tool with intersecting splines, it generates a hole at the intersecting area:
   
So to achieve what you need, there are two ways I see:

1. Generate two meshes, one for each spline, and combine them using any mesh combining solution.
   
2. Modify LibTessDotNet: LibTessDotNet  should be used such as it generates merged meshes. I looked at its code and examples, and it does not seem to me that it is implemented in that library. Except if I overlooked something (I might), the solution seems to modify LibTessDotNet to add this capability. Unfortunately this is not something I will be working on for now. So a solution would be to, if you don't have the skills to implement such modification, to open a ticket at LibTessDotNet's repository asking for this feature.
   

I hope this helped
Have a nice day