PineTree model export help. ModelView crashes. Help please.

[WALP]

I combined the mesh but now it has written out a error. Saying a material could not be written and when I tried to import the model, the model viewer crashed. Just when you think you got over the hill, you half to go over another.

you must not combine the mesh if it uses multiple materials, as amnesia only supports one per mesh.
If it is rotated or offset you apply transformations like The chaser said.
As for what it is called in maya I believe it was the freeze transformations option under modify.