Rayintersect

rayintersect <x> <y> <z> <vx> <vy> <vz> <x1> <y1> <x2> <y2> <intx> <inty> <intz> <ret>

Projects a ray from point <x> <y> <z> along vector <vx> <vy> <vz>, and determines where it intersects the vertical plane defined by the points <x1> <y1> and <x2> <y2>.

The point of intersection, if any, is returned as <intx> <inty> <intz>, with <ret> holding a value of 1 if an intersection exists and 0 otherwise.