MeshCollider.Raycast fail glitch?

Unity Engine
, , ,
1 
GameObject TempGameObj = new GameObject ();
TempGameObj.transform.position = TempGameObj.transform.localPosition = Vector3.zero;
MeshCollider PixelCollider = TempGameObj.AddComponent<MeshCollider> ();
PixelCollider.enabled = true;
 
Vector3[] TrianglePoints = new Vector3[3] {
    new Vector3 (0.4999, 0, 0.9999),
    new Vector3 (0.0001, 0, 0.9999),
    new Vector3 (0.0001, 0, 0.5001)
};
int[] TriangleTriangles = new int[3] {
    0, 1, 2
};
Mesh TriangleMesh = new Mesh ();
TriangleMesh.vertices = TrianglePoints;
TriangleMesh.uv = new Vector2[3] {
    new Vector2 (0.4999, 0.9999),
    new Vector2 (0.0001, 0.9999),
    new Vector2 (0.0001, 0.5001)
};
TriangleMesh.triangles = TriangleTriangles;
TriangleMesh.Optimize ();
PixelCollider.sharedMesh = TriangleMesh;
PixelCollider.cookingOptions = MeshColliderCookingOptions.EnableMeshCleaning;

//  yield return new WaitForFixedUpdate ();  //  This slows it down, but did not fix it.
//  Physics.SyncTransforms ();  //  This also slows it down and did not fix it.

Ray UV_Pointer = new Ray ( new Vector3 ( 0.001026562, 4.0f, 0.5028797 ), Vector3.down );

if ( PixelCollider.Raycast ( UV_Pointer, out BarycentricGenerator, 5.0f ) == false )
{
//  Debug.Log ( "ERROR! Raycast failed!\n" );
}

It always fails on this, but it succeeds dozes of times all over 4 other triangles. All of the triangles are flat, at height 0.
Sometimes it succeeds in other points within the triangle, other times it continuously fails.
I set all of the points in Blender and they line up, so it SHOULD intersect. I did the intersection through Plane.Raycast and that seemed to work.

So my questions are:
Does anyone have any idea why it is failing?
Is this an engine glitch?

2

Fixed it.
I checked the triangle normal:

Vector3 Vec1_0 = TrianglePoints[1] - TrianglePoints[0];
Vector3 Vec2_0 = TrianglePoints[1] - TrianglePoints[0];
Vector3 TriNorm = Vector3.Cross ( TriangleNormals[0], TriangleNormals[1] );
TriNorm.Normalize ();

Which gave me (0, -1, 0). SO I…

Physics.queriesHitBackfaces = true;

It Works now. In case anybody else shoots themselves in the foot.