How to rorate stl....

[Livezxy]

i'm sorry about this... but i had cost more then 2 days on it...

there's two problems about it , and i almost get first

1. Suit the png size, I use BiUnitCube, but sometimes the graph would over png's size..
   But that's accepted

2. When I set camera ... the graph can't be level...

such as this

this's i want

i try Scale and Rorota after LookAt...

and ... it been odd.......

Thx !