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Unreal Engine 4 can either take in normals only from an FBX file, normals and tangents from an FBX file, or it can simply re-calculate them on its own. The image above shows the difference in computed normals on the left , and imported normals and tangents on the right .
When importing an FBX file, you will find this feature near the top of the import dialog under Mesh . The pull down will have these 3 options:
Option |
Description |
---|---|
Compute Normals |
The engine computes normals and tangents. Smoothing group and normal info is discarded from the FBX info. |
Import Normals |
The normals are imported from the FBX file, tangents are computed by the engine. |
Import Normals and Tangents |
The normals and tangents are imported from the FBX file and nothing is computed by the engine. |