How to make a face out of a sphere section in geometry nodes?

Question

Trying to close this sphere section that is created by delete geometry node and position selection. How do I add make a face connecting the top open edges?

Note that in the screenshot, only the frame titled mantle is connected to output for simplification

Answer 1

Solved using Attribute Statistic and Transfer Attribute

Answer 2

Actually, all you need to do here is select the points along the open edge, and convert them into a mesh.

You can solve this as follows:

1. Convert only the points along the open edge into a curve with Mesh to Curve.
2. Convert this curve into a mesh with Fill Curve.
3. By converting the curve, its position was set to 0, so move it back to the position of the original curve.

PS: If you are using Blender 3.3, then you should apply the node Transfer Attribute instead of Sample Index.

_{(Blender 3.4)}