Sorry...Its for a morphing system I am working on
The system takes the ref target (Non Changed model) and a Morph Target - using
vec_lerp and places the vertex's the percentage of the change....

This is working fine...

Now I want to manage multiple changes to the model...
So I need to know the lenght and direction the vertex changed from the base to the target so I can then apply those changes as well

If that makes any sense