My doubt is actually not hard, but with the actualization i lose a feature i used to use.
Here is the situation: I need to create some points on this curve and each point on the top has its correspondent on the bottom exactly on the same elevation in X axis. To do this i need to use the parameter witch corresponds to the elevation required, but in X axis the curve has 2 possible coordinates so that once i insert the function related to the creation of the point only one coordinate (on the top) is selected. Previously i could use "PointIntersection2D" and select a index, witch allowed me to choose any intersection the function would find. Here is an Image of the situation:
The question is: is there any function or any oder way to select another index on the curve?
P.S.: I could split the curve in two new curves, and repeat the steps, but i'd like to know if there is a solution like the feature i used to use.