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Procedural mesh is black when apply rotation

I created procedural mesh from Static Vertices, Triangles, UV and Normals as shown in the figure.

Initial pyramid :

alt text

Rotation on x=180: Pyramid turned to the black.

alt text

Procedural Mesh Construction script:

alt text

Vertices:

alt text

Triangles:

alt text

Product Version: UE 4.13
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asked Oct 17 '16 at 12:52 PM in Rendering

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L34D3R
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avatar image L34D3R Oct 17 '16 at 12:54 PM

Normals:

alt text

UV:

alt text

normals.jpg (37.6 kB)
uv.jpg (36.1 kB)
avatar image manuaganu Oct 17 '16 at 01:26 PM

I am facing same problem.

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