How to change Decal's rotation at runtime relative to the floor or wall? C++

[Quaked54]

@jwatte

FVector right = CrossProduct(impactNormal, basis).GetUnsafeNormal();
FVector forward = CrossProduct(right, impactNormal);
FBasisVectorMatrix bvm(forward, right, impactNormal, FVector(0, 0, 0));

Would I in fact disregard using both cross products and creating a matrix based on both cross products in lieu of this new information? In favor of using this function.

@Jambax

FRotationMatrix::MakeFromXZ(ImpactNormal, MyOtherVector);