I created a trigger event that is activated when a ball lands close to a leaking pipe. This creates a large echolocation effect and attracts the enemy. This is also used to change which patrol manager the enemy if following. This should add some interest to the environment and make tense situations when the player accidentally attracts the enemy.
I then adjusted the echolocation shader in order to support a second colour. I’m using this to allow the enemy to give off red echolocation effects. This should make the enemy scarier and reveal more of the environment around it. This effect also leaks around corners and through walls giving the player a quick heads up that the enemy is nearby giving them time to hide. This should build tension as seeing this red glow will be a clear sign of danger but with the hope of escape.
https://www.youtube.com/watch?v=1p0SH_T2bm4&feature=youtu.be
Mitchell Gibson - Gameplay and Prototyping 