Hello, I was wondering if you kind people could shed some light on my brain freeze 
I have successfully been able to acquire some .bvh motion files and a model that is rigged, attach the .bvh and bring it into unity without a problem. My confusion is the different axises the animation is facing. If for example I had a idle standing animation and a walk animation in my player and the walking animation is walking 90 degrees in the other direction to my idle animation, what would happen? would I need to fix all my animations and have them face the same axis before adding to my rigged player, and the height also centered? I have looked but found vague answers and my brain is straining to puzzle them together.
Can’t answer specifically for Unity but I can tell you based on my own experience with using bvh motion capture if the walk bvh is 90 degrees rotated from the idle your character will turn. In Unity I imagine if your walk is rotated 90 degrees, your character will walk sideways. Best to make sure there is no rotation at all in the bvh. Easiest way to find it is to give it a try without changing it.
Cool bananas, I just thought I could ask maybe someone had experience with it, and I’m sure there are a lot of people, and I’m at work at the moment so I’ll try experimenting more when I get home just now. It sounds logic to have all the animations facing the same direction, zeroed out and having the game script rotate the player. ps my mind races ahead of my actions and I have so many questions before I have the chance to educate myself on the topic.