I am trying to use CFirtsPersonCamera class.It's working when i am opening mesh's.I can walk around mesh's but when i was trying to open bsp maps screen is freezing. BSP map can open perfectly and also mesh's but if i want to move, BSP map stay stable and i can move around only mesh's. http://img399.imageshack.us/my.php?image=firtspersoncameraproblem5kk.jpg In rendering of BSP map i am using D3DXVECTOR3 vEyePt which includes CBaseCameraclass.I guess i am using the wrong eyept but i couldn't figure it out. i am waiting for helps.Thanks :)