Question [Physics.PhysX] TriangleMesh::loadFromDesc: desc.isValid() failed!

Hello! I'm currently working on a building system for my game that will create a mesh based on an array of scriptable objects. However, when I run it this error appears:

[Physics.PhysX] TriangleMesh::loadFromDesc: desc.isValid() failed!

I'm fairly new to unity, and so I am hoping somebody could help me understand it!
Here is my code:

Code (CSharp):

1.  
2.         Destroy(this.gameObject.GetComponent<MeshCollider>());
3.         Mesh mesh = transform.GetComponent<MeshFilter>().mesh;
4.         Mesh newMesh = new Mesh();
5.  
6.         //loop to create mesh
7.         for (int y = 0; y < buildArray.GetLength(0); y++)
8.         {
9.             for (int z = 0; z < buildArray.GetLength(1); z++)
10.             {
11.                 for (int x = 0; x < buildArray.GetLength(2); x++)
12.                 {
13.                     if (buildArray[x, y, z] != null)
14.                     {
15.                         Mesh BlockMesh = buildArray[x, y, z].mesh;
16.                         CombineInstance[] combine = new CombineInstance[1];
17.                         combine[0].mesh = BlockMesh;
18.                         newMesh.CombineMeshes(combine, true);
19.                      
20.                     }
21.                 }
22.             }
23.         }
24.         mesh.Clear();
25.  
26.         mesh.vertices = newMesh.vertices;
27.         mesh.triangles = newMesh.triangles;
28.         mesh.Optimize();
29.         mesh.RecalculateNormals();
30.  
31.         //and the error happens here:
32.         this.gameObject.AddComponent<MeshCollider>();

-Thanks!
-This is also my first time on the forums, so I apologize if my question isn't clear.

 

Find out precisely what line this is happening on by either attaching the debugger or by injecting return statements from the end going up until it stops.

If it is bad data, steps to debug:

1. Get this error to fire with the simplest possible geometry.
2. when it occurs, write the mesh verts and triangles out to a file so you can analyze them

Keep in mind there are upper limits to mesh size, depending on version of Unity. They are detailed in the documentation somewhere. It used to be 64k verts but I've not paid attention in a while.

 

Thanks for your suggestions! I replaced the mesh I was using with a cube, and have also figured out that this error only happens if lines 16-18 are run. However it actually triggers on line 32 when the collider is created. I'm just confused about what the error means.

 

@robbiemaldrich Did you figure it out? I have an algorithm that generates meshes - would be nice to have some pointers as to what causes it before I go digging myself.

Edit: Should have looked around more first.
https://github.com/atteneder/glTFast/issues/137#issuecomment-816651277

This was my mesh though:
verts: (8.0, 0.0, 8.0) (8.0, 0.0, 8.0) (8.0, 0.0, 8.0) (8.0, 0.0, 8.0) (8.0, 0.0, 8.0) (8.0, 0.0, 8.0)
tris: 0 1 2 3 4 5
(obviously something went wrong as they are all the same point XD)