Inventory Texture Map Bug

[cjmjhu]

Inventory Texture Map Bug

Description: The game fully crashes when attempting to collect any mined resources. This is due to a texture mapping issue for the quad model used in the inventory. It seems to expect 6 uvs but gets 33.

OS: Windows 11

Ursina Version: 7.0.0

Steps to reproduce:

1. Run main.py in python_meshCraft_tut_2021
2. Mine any resource (cube)
3. Attempt to collect the resource

At this point, the game will crash with the exception:

Exception: Error in Mesh. Ensure Mesh is valid and the inputs have same length: vertices:6, triangles:0, normals:6, colors:0, uvs:33

Note, this is related to the following implementation from the YouTube series: part 14 at 39:30

My Fix
The following updated set_texture function in inventory_system.py fixed the issue for me. It uses only 6 uvs (for a quad face) and properly orders them based on what the Ursina quad model expects.

def set_texture(this):
      # Use dictionary to access uv co-ords.
      uu=minerals[this.blockType][0]
      uv=minerals[this.blockType][1]
      # *** - for ursina update fix
      basemod=load_model('block.obj',use_deepcopy=True)
      e=Empty(model=basemod)
      cb=copy(e.model.uvs)
      #del cb[:-33]
      cb = cb[-6:] #get last 6 uvs
      cb = cb[3:] + cb[:3] #reverse order
      this.model.uvs = [Vec2(uu,uv) + u for u in cb]
      this.model.generate()
      this.rotation_z=180

My full traceback of the error can be found below.

Traceback (most recent call last):
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\mesh.py", line 90, in _set_array_data
    vmem[:] = a
ValueError: memoryview assignment: lvalue and rvalue have different structures

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\main.py", line 181, in _update
    e.update()
  File "c:\_repos\ursina_tutorials\python_meshCraft_tut_2021\collectible_system.py", line 90, in update
    this.checkPickUp()
  File "c:\_repos\ursina_tutorials\python_meshCraft_tut_2021\collectible_system.py", line 108, in checkPickUp
    Item.new_item(this.blockType)
  File "c:\_repos\ursina_tutorials\python_meshCraft_tut_2021\inventory_system.py", line 238, in new_item
    b=Item(_blockType)
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\ursinastuff.py", line 230, in __call__
    obj = type.__call__(cls, *args, **kwargs)
  File "c:\_repos\ursina_tutorials\python_meshCraft_tut_2021\inventory_system.py", line 126, in __init__
    this.set_texture()
  File "c:\_repos\ursina_tutorials\python_meshCraft_tut_2021\inventory_system.py", line 139, in set_texture
    this.model.generate()
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\mesh.py", line 183, in generate
    self._set_array_data(vdata.modify_array(uv_attribute_index), self._ravel(self.uvs), 'f')
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\mesh.py", line 92, in _set_array_data
    raise Exception(f'Error in Mesh. Ensure Mesh is valid and the inputs have same length: vertices:{len(self.vertices)}, triangles:{len(self.triangles)}, normals:{len(self.normals)}, colors:{len(self.colors)}, uvs:{len(self.uvs)}')
Exception: Error in Mesh. Ensure Mesh is valid and the inputs have same length: vertices:6, triangles:0, normals:6, colors:0, uvs:33
:task(error): Exception occurred in PythonTask update
Traceback (most recent call last):
  File "C:\Users\chris\anaconda3\envs\ursina\lib\site-packages\ursina\mesh.py", line 90, in _set_array_data
    vmem[:] = a
ValueError: memoryview assignment: lvalue and rvalue have different structures