Algorithm to trim non-solid geometry

[Neil_Burkholder]

Found a few clues here:

Checking if point is within solid (group or component)

Okay, I’m stuck again, and I think I’ve really done it this time. I’ve got a point that the user picks and I need to determine if it is inside of a group (solid). The API does not seem to have a way of checking this and I don’t seem to have a good algorithm either.