The attached file will hopefully illustrate what I'm trying to achieve. (Please ignore my ridiculous scale)
The Point-cloud consists of six individual Point-clouds of 360 points. Each describing the inner or the outer edge of an ellipse resulting in three different, flat elliptical rings.
The intention is to create a solid ring from these, two representing the side of the solid and the remaining, the middle. It is the edge forms of this solid ring that I wish to achieve, more quickly than I have been able.
The 'stitching' that I have done in the attached file joins the outer points n together and similarly the inner points n.
The edge form is covered (triangulated) by joining sides n to middle n+1 from 0 to 180 and by joining sides n to middle n-1 from 181 to 360.
Having articulated this, I realise now, that this could be coded but I have no knowledge how it might be dome.
PLEASE EXCUSE THE RIDICULOUS SCALE