Look up the error code, it tells you EXACTLYwhat's wrong.
I've looked into it before and I am still clueless.
SubGrid does not know mCamera. Using Terrain::mCamera does not work. Making mCamera static also. :/ Thanks for your help, though.
It says: "Camera & Terrain::mCamera Error: a nonstatic member reference must be relative to a specific object"
But this gets called after the constructor where I pass the specific object (the reference) to mCamera. I'm clueless.