Vertex Normal Toolkit for 3ds Max
You will get AAA nurbs shading quality for polygonal meshes.
scgstudio posts
If you look for a tools, which will aid you in export asset process to Unity3D and Unreal Engine 4/5 take a look :) :
MMVNF
Mirrored mesh vertex normal fix.
NOTE : If you do not have a good tool to make a perfect vertex normals look here: https://gumroad.com/l/VertexNormalToolkit
Script which can mirror selected meshes and keeps all normal information not distorted.
Supports edit and editable poly.
Does not collapse modifier stack.
ver. 1.5 supports hard edges. previous...