need help with improveing wall geneation for 3d game.

Question

i am trying to make a random 3d wall generation from a static block i set up
i have a simple gdscript to do this but i need it to connect to walls around it and make it less clippy as right now there is alot of overlaps with the walls and it's quite slow

i need help improving the code and making the generation alot better
if you could help me with the code or give me links to help me research on how to do it better that would be great, many thanks in advance

here is my code so far:
extends Node

onready var hall = preload("res://wall_stright.tscn")
onready var hal = preload("res://wall_left.tscn")
var y = 0.0



#   var num = 100#
#   var cords_x = []
#   var cords_z = []
#   var temp = -1
    #if 1 == 1:
#       var valid = false # valid loop so object's don't spawn inside each other#
#       while not valid:
#           var num_count = 0
            # gen x and z cords
            #x  = randi() % num
            #z  = randi() % num

            # check if space is already taken
            #temp = cords_x.find(x)
            #if temp == -1:
        #       for v in range(int(x-5), int(x+5)):
    #               temp = cords_x.find(v)
#                   if temp == -1:#
                #       num_count += 1
            #       
        #       temp = cords_z.find(z)
    #           if temp == -1 and num_count >= 5:
#                   cords_x.append(x)#
#                   cords_z.append(z)
        #           valid = true

func check_cords(cords, base):
    var temp = -1
    var count = 0
    for i in range(int(base-2), int(base+2)):
        print("i: ", i)
        temp = cords.find(i)
        if temp != -1:
            count += 1


    if count >= 5:
        return true
    else:
        return false
func add_wall_right(float_x, float_z):
        var hall_add = hall.instance()
        add_child(hall_add)
        # move to cords in scene
        hall_add.transform.origin = Vector3(float_x, y, float_z)        
func add_wall_left(float_x, float_z):
    pass

func gen():
    # all veriables used (will refine after make)
    var x = 0
    var x_cords = [] # this is so there is no close collison

    var z = 0
    var z_cords = [] # this is so there is no close collsion


    var op = 0
    var float_x = 0.00
    var float_z = 0.00
    var num = 100

    var temp = bool()
    var valid = false

    for i in range(0, 10): # for loop to gen first bit of the map (this is the amont of walls to gen
        print("adding object...")

        valid = false
        while not valid:
#           print("oh oh")
            x  = randi() % num
            z  = randi() % num
            print("pre data")
            print("pre x: ", x)
            print("pre z: ", z)

            if x_cords.find(x) == -1:#
                #temp = check_cords(x_cords, x)
            #   if temp == true:
                valid=true
        #       else:
    #               valid=false
            else:
                valid=false
            if z_cords.find(z) == -1:
                #temp = check_cords(z_cords, z)
                #if temp == true:
                valid=true
        #       else:
    #               valid=false
            else:
                valid=false
        x_cords.append(x)
        z_cords.append(z)

        op = randi() % 2


        # convet to float
        float_x = float(x) + 0.00
        float_z = float(z) + 0.00

        print("x: ", float_x)
        print("z: ", float_z)
        print("op: ", op)

        # add to scene
        if op == 1:
            var hall_add = hall.instance()
            add_child(hall_add)
            # move to cords in scene
            hall_add.transform.origin = Vector3(float_x, y, float_z)

            # the code below just adds extends the walls
            var cho = randi() % 5
            for cell in range(0, 5):
                float_z += 5
                var hal_dd = hall.instance()
                add_child(hal_dd)
                # move to cords in scene
                hal_dd.transform.origin = Vector3(float_x, y, float_z)

        else:
            var hall_add = hal.instance()
            add_child(hall_add)
            # move to cords in scene
            hall_add.transform.origin = Vector3(float_x, y, float_z)

            # the code below just adds extends the walls
            var cho = randi() % 5
            for cell in range(0, 5):
                op = randi() % 2
                float_x += 10

                var hal_dd = hal.instance()
                add_child(hal_dd)
                # move to cords in scene
                hal_dd.transform.origin = Vector3(float_x, y, float_z)


func _ready():
    print("runing...")
    randomize()
    gen()
    #for i in range(0, 100):
    #   pass