How to know if a line intersects a plane in C#?

Question

I have two points (a line segment) and a rectangle. I would like to know how to calculate if the line segment intersects the rectangle.

Answer 1

If it is 2d, then all lines are on the only plane.

So, this is basic 3-D geometry. You should be able to do this with a straightforward equation.

Check out this page:

http://local.wasp.uwa.edu.au/~pbourke/geometry/planeline/.

The second solution should be easy to implement, as long as you translate the coordinates of your rectangle into the equation of a plane.

Furthermore, check that your denominator isn't zero (line doesn't intersect or is contained in the plane).