In SleeperVolumes.cs there's a "CheckTouching" method which appears to detect when the player is touching a volume. The important part is highlighted in orange.
public void CheckTouching(World _world, EntityPlayer _player) {
...
else if (etriggerType == SleeperVolume.ETriggerType.
Attack && <bunch of math>
this.
TouchGroup(_world, _player, true);
The TouchGroup method just iterates over all the sleeper groups and calls Touch() on them. This is where the zombie gets its 'freebie' chance to see the player:
bool flag =
trigger == 2 ;
-- this will be 'true' on an "Attack" sleeper, which is trigger type 2
foreach (
[zombie in the volume])
{ ...some irrelevant stuff snipped...
if (
flag && _player.Stealth.
CanSleeperAttackDetect(entity))
-- if it's "Attack" and the sleeper can detect the player...
{
entity.ConditionalTriggerSleeperWakeUp();
-- wake up
entity.
SetAttackTarget((EntityAlive) _player, 1200);
-- set the player as the attack target
}
else
-- either not "Attack" or can't see the player
entity.
SetSleeperActive();
-- go into Active mode
}
Finally, the CanSleeperAttackDetect() method uses light and distance to check whether the zombie can see the player:
public bool CanSleeperAttackDetect(EntityAlive _e)
-- the 'e' variable here is the sleeper zombie
{
if (this.player.IsCrouching)
-- you gotta be crouching...
{
float num = Mathf.Lerp(3f, 15f, (float) (((double) this.lightAttackPercent - 0.349999994039536) * 1.53846156597137));
if ((double) _e.GetDistance((Entity) this.player) > (double) num)
return false;
-- bunch of math above determines if we reach this 'false' return (sleeper can't detect you)
}
return true;
-- not crouching? sleeper will auto-detect you
}
