I’ve been working on generating a simplified mesh in Godot from cubes placed in a GridMap, but I keep hitting a snag. My goal is to combine the cube meshes into a single `ArrayMesh`, but when I check for surfaces, it always returns 0, which is really frustrating! Here’s a snippet of the code I’m using:

“`gdscript
func create_combined_cube_mesh(gridmap: GridMap) -> ArrayMesh:
print(“Create combined cube mesh…”)
var array_mesh = ArrayMesh.new()
var box_mesh = BoxMesh.new()
box_mesh.size = gridmap.cell_size

var arrays = box_mesh.surface_get_arrays(0)
var vertices = arrays[Mesh.ARRAY_VERTEX]
var indices = arrays[Mesh.ARRAY_INDEX]

var mesh_data = []
mesh_data.resize(Mesh.ARRAY_MAX)
mesh_data[Mesh.ARRAY_VERTEX] = []
mesh_data[Mesh.ARRAY_INDEX] = []

var vertex_offset = 0

for cell in gridmap.get_used_cells():
var transform = gridmap.map_to_local(cell)
for v in vertices:
mesh_data[Mesh.ARRAY_VERTEX].append(v + transform)

for i in indices:
mesh_data[Mesh.ARRAY_INDEX].append(i + vertex_offset)

vertex_offset += vertices.size()

array_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, mesh_data)

print(array_mesh.surface_get_arrays(0).size()) // always prints 0

return array_mesh if mesh_data[Mesh.ARRAY_VERTEX].size() > 0 else null
“`

I ran through the code and it looks fine at first glance, but that `surface_get_arrays(0).size()` call always returns 0 after I try to add the surface. I’ve double-checked that `mesh_data` actually collects the vertices and indices from the `BoxMesh`, and I should be getting a valid mesh. But it seems like something’s going wrong when I add the surface or maybe even before that.

Has anyone else had this issue, or does something seem off with my approach? I thought maybe it has to do with how I’m transforming the vertices or populating the `mesh_data`, but I can’t put my finger on it. Any advice or guidance would be super helpful. What could be causing the `ArrayMesh` to end up empty when it should be populated?