Ursina Engine Cube is not appearing under cube upon clicking

Question

So i have my code and I want to appear a cube under a cube i will click. Then i want to check if there are cubes around this cube if in some place there isnt a cube then create one but i cant do this. Can someone help me?

from ursina import *
from ursina.prefabs.first_person_controller import FirstPersonController
app = Ursina(borderless = False)

player = FirstPersonController(model='none', position=(0,5,0), scale=2)


Sky()

overworld_ground = Entity(
    model = 'cube',
    scale = (32,2,18),
    position = (0,0,0),
    collider = 'mesh',
    color = color.rgb(0, 128, 0),
    texture = 'grass'
    )
class Voxel(Button):
    def __init__(self, position = (0,0,0)):
        super().__init__(
            parent = scene,
            position = self.position,
            model = 'cube',
            collider = 'box',
            rotation = (0,0,0),
            color = color.rgb(0, random.uniform(162,182), 0),
            scale = (2, 2, 2))
    def input(self, key):
        if self.hovered:
            if key == 'left mouse down':
                voxel = Voxel(self.position.y - 2)
                destroy(self)

for z in range(8):
        for x in range(8):
            voxel = Voxel(position = (x * 2 - 11,-1,z * 2 + 10))



app.run()

Answer 1

I see two problems with your code. When I fix both of these, I get something reasonable that I think will put you in a place where you can proceed with your development:

1. I get an error when I try to run your code, involving the line position = self.position,. This line makes no sense. Here, you reference the position attribute of the object that you're just starting to construct. Also, you aren't using the position parameter passed to the constructor. To resolve both of these issues, I expect that what you want here is position = position to simply pass the passed in position along to the superclass's constructor.

2. This line looks suspicious as well: voxel = Voxel(self.position.y - 2). You're taking just the y component of an object's position and passing that to the Voxel constructor that expects a 3-d position.

I fixed both of these issues, and played around with where the new Voxels are created so that I could see them. Once I did this, clicking on an existing Voxel caused a new one to appear and that one to disappear, which seems like what you want to see happening.

So here's my fixed version of your code that behaves more correctly:

from ursina import *
from ursina.prefabs.first_person_controller import FirstPersonController
app = Ursina(borderless = False)

player = FirstPersonController(model='none', position=(0,5,0), scale=2)


Sky()

overworld_ground = Entity(
    model = 'cube',
    scale = (32,2,18),
    position = (0,0,0),
    collider = 'mesh',
    color = color.rgb(0, 128, 0),
    texture = 'grass'
    )
class Voxel(Button):

    def __init__(self, position = (0,0,0)):
        super().__init__(
            parent = scene,
            position = position,  # <- was self.position
            model = 'cube',
            collider = 'box',
            rotation = (0,0,0),
            color = color.rgb(0, random.uniform(162,182), 0),
            scale = (2, 2, 2))

    def input(self, key):
        if self.hovered:
            if key == 'left mouse down':
                p = self.position
                p.z += 20
                voxel = Voxel(position=p)
                destroy(self)

for z in range(8):
        for x in range(8):
            voxel = Voxel(position = (x * 2 - 11,-1,z * 2 + 10))

app.run()