void HudSetCameraActor(int tid)

This is a HUD Library function.

Sets camera position and direction to match those of the specified actor.

See HudSetCameraActorAdvanced for what tweaks this function performs.

while (IsPlaying())
{
    HudResetState();
    HudSetCameraActor(0);
    Draw3DStuff();
    Delay(1);
}