Issue with Modifying Vertices of multiple Game objects

Hi,

I have a script which loads a mesh and basically outputs a game object per triangle. That part works great.

Now I am trying to add noise to these individual Game object triangles vertices in Update() only for my vertices to take the vertices previous positions and add the noise to that.

What I want it to do is only ever add the noise to the original vertex positions which were set in Start() and come from the original meshes triangles vertices.

If i pause The game before running i see that the first frame does exactly what i want, but i notice that the triangles disappear into space as the game updates.

To keep the question short I will only post the update loop since I am fairly sure that is where the issue lies.

The code is a little bit of a mess at the moment as its all wip so please excuse it, Also I am fairly new to Unity and rusty in general at C#

void Update() { // Generate some Noise to apply to vertices later setNoise();

     // Loop over all Triangle Game Objects
     for (int i = 0; i < _triangles.Length; i++)
     {
         // Grab the Mesh Component
         _triangleMeshFilter = _triangles[i].GetComponent<MeshFilter>();
         Mesh mesh = _triangleMeshFilter.mesh;
         Vector3[] triangleVerts = new Vector3[3];

         // Set the vertices to a temporay array
         triangleVerts = mesh.vertices;

         // Loop over the vertices in the GameObject (Should only be three)
         for (int j = 0; j < triangleVerts.Length; j++)
         {
             // Set a Color to the UV locations of the Vertices
             Color tri_Noise = texture.GetPixelBilinear(mesh.uv[j].x, mesh.uv[j].y);

             // The temporay vertex array is modified by multiplying the Color value by the current vertex values
             var temp = triangleVerts[j];
             triangleVerts[j] = Vector3.Scale(temp, new Vector3(tri_Noise.r, tri_Noise.g, tri_Noise.b));
         }

         // Set the actual mesh vertices to updated vertices
         mesh.vertices = triangleVerts;
     }
 }

What I have tried so far to no avail is:

I have created a giant vertex array when i create the triangle initially and then looped over that in the update instead. this was messed up somehow but the vertices did not fly into space.

I copied the array of triangle Gameobjects into a new array in Start() and used that as the lookup in Update() for every loop of triangle objects

I am assuming that the issue is here:

 triangleVerts = mesh.vertices;

Am I missing something really simple or is this just not possible?

Here is a link to a sample scene incase I am not very Clear above. Click pause before play and you will see what i expect to always see, A Cube with noise applies and distorted. But if you continue it disappears into the abyss

Thank you for any help you can give :)