Horizontal Spread Raycasting

init.lua

local spread = math.pi / 16
local amount = 13
local range = 4

local function doraytrace(start, target)
        for pointed in minetest.raycast(start, target, false, false) do
                local pos = pointed.intersection_point
                minetest.add_particle({
                        pos = pos,
                        exptime = 1,
                        texture = "fake",
                        size = 1,
                        glow = 15
                })
        end
end

local function swing(player)
        local camera_z = player:get_look_dir()
        local camera_x = minetest.yaw_to_dir(player:get_look_yaw())
        local start = player:get_pos()
        start.y = start.y + 1.62
        for i = -amount / 2, amount / 2 do
                local rel = vector.multiply(minetest.yaw_to_dir(spread * i), range)
                local target = vector.add(start, vector.multiply(camera_z, rel.z))
                target = vector.add(target, vector.multiply(camera_x, rel.x))
                doraytrace(start, target)
        end
end

minetest.register_tool(minetest.get_current_modname() .. ":x", {
        on_use = function(stack, who)
                swing(who)
                return stack
        end
})