function raymond(a, b, callback, dist, filter)
    if IsEntity(a) then
        a = a:EyePos()
    end

    if IsEntity(b) then
        b = b:EyePos()
    end

    local id = "audiencelaugh" -- tostring(a) .. tostring(b)
    local i = 0
    local mapped = {}

    local last

    local filter = table.Merge({a,b}, filter or {})
    filter = table.Merge(filter, ents.FindByClass("func_door"))

    local function random_dir(dir)
        local len = dir:Length()
        dir = dir:Normalize()
        return LerpVector(((i%100)/100), dir, VectorRand()) * len
    end

    local function line(a, b)
        local dir = random_dir(b-a)
        local data = util.QuickTrace(a, dir, filter)

        debugoverlay.Line(a, data.HitPos, 5, HSVToColor(i%360, 1, 1), true)

        local pos = data.HitPos

        return pos
    end

    local function iterate(a, b, i)
        local pos = line(a, b, i)

        if pos:Distance(b) > (dist or 100) then
            return pos
        else
            return false
        end
    end

    hook.Add("Think", id, function()
        if i%100 == 1 then
            print("searching...")
        end

        for i2 = 0, 200 do
            local pos = iterate(a, b, i)
            if pos then
                if last ~= pos then
                    table.insert(mapped, pos)
                end
                a = pos
                last = pos
            else
                hook.Remove("Think", id)
                if callback then
                    callback(mapped)
                else
                    print(#mapped .. " ray's bounced")
                end
                break
            end
            i = i + 1 + i2
        end
    end)
end