enum EFlipBackfacingMode FlipBackfacingMode decides which source normal we should compare the destination normal with when calculating if a normal is back-facing or not.
| Key | Value | Comment | 
|---|---|---|
| PixelNormal | 0 | Normal calculated at the pixel. Includes interpolation between vertex normals and normal map inputs. | 
| FaceNormal | 1 | Face normal of the polygon. | 
| Key | Value | Comment | 
|---|---|---|
| PixelNormal | 0 | Normal calculated at the pixel. Includes interpolation between vertex normals and normal map inputs. | 
| FaceNormal | 1 | Face normal of the polygon. | 
| Key | Value | Comment | 
|---|---|---|
| EFlipBackfacingMode_PixelNormal | 0 | Normal calculated at the pixel. Includes interpolation between vertex normals and normal map inputs. | 
| EFlipBackfacingMode_FaceNormal | 1 | Face normal of the polygon. |