Specific methods to interaction domain results to extract limit axial load capacity

[talledodiego]

Consider to add specific methods at the level of interaction domain results objects to extract the limit axial load capacity.

We should think if this is can be generalize enough

The idea could be a simple ray casting in direction of the N axis. This should work both in 2D NM interaction and in 3D NMM interaction. It does not makes sense in 2D MM interaction probably.

In the 2D version should be easy enough because we have just a bunch of points that forms a convex or concave polygon (we don't care).

In the 3D version for now we have a set of non-structured cloud points. The whole domain is not guaranteed to be convex. Think if we before need a tool for returning a structured interpolated grid of points or if we can work directly with the raw set of points.

I totally agree with you, and thanks for raising this issue, which allowed us to look further into it.

I suggest the following plan that can be pursued also with separate PRs, if you agree:

• Improve docstrings to make this clear. Possibly in the short term.
• Create a section in the theory docs specifically stating this aspect. Possibility in the short term.
• Eventually consider adding a usage example that shows how to extract the green points. Medium term.
• Eventually consider adding specific methods in the results objects to extract those green points. Medium term.

Originally posted by @talledodiego in #330