Get collision point on the normal of a block in a grid

Grid collision detection

//Calculate intersection point in grid
var V = {x:1, y:-1, z:0, w:1}; //direction
var A = {x:1.5, y:1.5, z:0}; //point or origin
 
var n = {x:0, y:1, z:0, w:1}; //normal
var b = {x:2, y:0, z:0}; //grid block position
 
var rp = {x:null, y:null, z:null}; //result position
 
var mid = (A.x * Math.abs(n.x) + A.y * Math.abs(n.y) + A.z * Math.abs(n.z)) - (b.x * Math.abs(n.x) + b.y * Math.abs(n.y) +b.z * Math.abs(n.z) + n.w);
 
var rpMagnitude = mid/(V.x * Math.abs(n.x) + V.y * Math.abs(n.y) +V.z * Math.abs(n.z));
 
rp.x = A.x - V.x * rpMagnitude * 1.00001;
rp.y = A.y - V.y * rpMagnitude * 1.00001;
rp.z = A.z - V.z * rpMagnitude * 1.00001;
 
//if the rvMagnitude is > than V.w(direction magnitude) than rv is longer than the direction vector
//and then there is no collision on this block normal vector
console.log(rp, rpMagnitude < 0, rpMagnitude);


detected = (rp.x >= b.x && rp.x < b.x+1) && (rp.y >= b.y && rp.y < b.y+1) && (rp.z >= b.z && rp.z < b.z+1)
console.log(detected);