A few questions

Hello everyone,

I have two questions that you hopefully know.

1. What is the best way to find the intersection between a line/ray and a face/solid?(What package?)

2. I have a surface/solid and I want to find the contour of that surface/solid at specific points and create a spline/curve from it (Extremely important that the spline/curve is relative to the x/y coordinates of the specified point). Example of what I mean http://i2.minus.com/jjSRyjcwgOqC1.png

Thank you for any help