typedef void (*PK_FSTART_f_t)(int *ifail);



  Start up the frustrum

Returns:
  int                      *ifail          --- error code: FR_no_errors


Description:
  This function initialises the frustrum. It is called from kernel
  function PK_SESSION_start and is the first frustrum function to be called.
  Calls to FSTART and FSTOP (which closes down the Frustrum) may be
  nested, in which case only the "outermost calls" (i.e. the first FSTART
  call, and the "balancing" FSTOP call) should have any effect. However,
  once the frustrum has been closed down, a further FSTART call should
  cause it to be re-initialised.