I have extruded 2 arcs and intersected with a revolution.

Then I added tangent curves to extend and and arcs to fill out the shape.

Here I have created an networksrf from those frames (I get the same problem with sweeps).

I am trying to create a bump on the green surface.

If I try to split the green surface with the blue, I get the two shapes do not intersect.

I started out with a blocked box using the blue shape and tried to do a boolean union and I get the same error that they do not intersect.

How can I create such a bump on the revolution?

I need to end up with:

Problem Intersection.3dm (3.1 MB)