MeshSphere contains unused vertices

[plojo]

When inspecting a MeshSphere, the first and last vertex never get referenced by any face. Is this intended?

Simple MeshSphere:

latitudes: 2
longitudes: 3

Faces (vertex indices):
0: [1, 4, 3]
1: [1, 2, 4]
2: [4, 7, 6]
3: [4, 5, 7]
4: [7, 10, 9]
5: [7, 8, 10]

Vertices (positions):
0: [0, 0.5, 0]
1: [0.5, 0, 0]
2: [0, -0.5, 0]
3: referTo 0
4: [-0.25, 0, -0.4330126941204071]
5: referTo 2
6: referTo 0
7: [-0.2499999850988388, 0, 0.4330126941204071]
8: referTo 2
9: referTo 0
10: referTo 1
11: referTo 2

[JirkaDellOro]

I can't remember an intention behind this, suspect a bug...

[plojo]

These lines in RenderMesh.ts suggest that this was at least known at some point:

FUDGE/Core/Source/Render/RenderMesh.ts

Lines 100 to 102 in ba34c27

	// some vertices might be unused and yield a zero-normal...
	if (_vertex.normal.magnitudeSquared > 0)
	_vertex.normal.normalize();

[JirkaDellOro]

The problem, but the intention?