Function VectorMath.LineRayIntersectionFactorXZ

float LineRayIntersectionFactorXZ (

Int3	start1
Int3	end1
Int3	start2
Int3	end2

)

Returns the intersection factor for line 1 with ray 2.

The intersection factors is a factor distance along the line start - end where the other line intersects it.
intersectionPoint = start1 + factor * (end1-start1)
Lines are treated as infinite.
The second "line" is treated as a ray, meaning only matches on start2 or forwards towards end2 (and beyond) will be returned If the point lies on the wrong side of the ray start, Nan will be returned.

NaN is returned if the lines are parallel.