Module 

Header 
/Engine/Source/Runtime/Core/Public/Math/UnrealMathUtility.h 
Include 
#include "Math/UnrealMathUtility.h" 
Source 
/Engine/Source/Runtime/Core/Public/Math/Plane.h 
Find the intersection of a ray and a plane. The ray has a start point with an infinite length. Assumes that the line and plane do indeed intersect; you must make sure they're not parallel before calling.
FMath inline functions
The point of intersection between the ray and the plane.
Parameter 
Description 

RayOrigin 
The start point of the ray 
RayDirection 
The direction the ray is pointing (normalized vector) 
Plane 
The plane to intersect with 