finit
  fldpi
  pushd 180
  fild DWORD PTR [esp]
  fdiv
  fld oldFovValue
  fmul
  pushd 2
  fild DWORD PTR [esp]
  fdiv
  fptan
  fstp st
  fild aspect1
  fild aspect2
  fdiv
  fmul
  fld1
  fpatan
  pushd 2
  fild DWORD PTR [esp]
  fmul
  pushd 180
  fild DWORD PTR [esp]
  fldpi
  fdiv
  fmul
  fstp newFovValue
  add esp,16