How do I make a brick spawn in front of another brick based on LookVector?

function summonBrick()
local brick = instance.new("Part")
brick.name = 'Bricc'
brick.Size = Vector3.new(1,1,1)
brick.brickcolor = BrickColor.new("White")
brick.Parent = game.Workspace
brick.Anchored = true
brick.Position = Vector3.new(0,0,0)
wait(1)
local brick2 = instance.new("Part")
brick2.name = 'Bricc2'
brick2.Size = Vector3.new(1,1,1)
brick2.Anchored = true
brick2.brickcolor = BrickColor.new("White")
brick2.Parent = game.Workspace
brick2.Cframe = birck.Cframe + Vector3.new(0,0,3) -- I can make the brick spawn 3 studs away from "brick" in accordance with the "z" axis.
end

I cannot figure out how to make the brick spawn 3 studs out based off the LookVector