Geometry Nodes: Draw Curve from Point 0 to Point 2 of Geometry. (Blender3.0)

Question

I am trying to draw an inscribed 7 side polygon (centred on 0,0,0), where a curve goes from each point through the origin to the 2nd next point; for example point 0 (through origin(0,0,0)) to point 2.

Psuedocode would be:

For each point 
    draw curve from prevI to nextI

Problem: Curve takes vector start, and vector end.

I am able to get the prevI and nextI but how do I access the vector position for that Index (to give to my curve)?

Answer 1

I am not sure that I understand your question. Do you want to do something like in one of examples below?

Example_1.

Here Curve Line center point is at 0.0.0. And Curve Line endpoints are dropped to the nearest points of the Curve Circle.

Example_2.

Here Curve Line center point is at 0.0.0. And Curve Line endpoints are dropped to the N and N+1 points of the Curve Circle.

Example_3.

Here cyclic spline do seven loops.