I need graphics expert. How set mesh vertex normals? (not's material normal map)

[dreamdev]

@glib

In that particular quad’s case:
FVector First = Triangles[1] - Triangles[0];
FVector Second = Triangles[2] - Triangles[0];
Normals[0] = FVector.CrossProduct( First, Second ).Normalized();

Very thankful!
I searched lots of related information, but I couldn’t understand it.

I try another way:
Build height map in C++
UTexture2D *HeightMapData;

Create normal maps from height maps in material: