code/__defines/overlays.dm 
| HAS_MANAGED_OVERLAYS | Does this atom currently have managed overlays? |
|---|---|
| OVRGR_AO_REG | Standard turf AO. |
| OVRGR_AO_Z | Z-AO for Z-Mimic depth cues. |
| OVRGR_AO_MID | Z-Mimic false AO for deep holes. |
Define Details
HAS_MANAGED_OVERLAYS 
Does this atom currently have managed overlays?
OVRGR_AO_MID 
Z-Mimic false AO for deep holes.
OVRGR_AO_REG 
Standard turf AO.
OVRGR_AO_Z 
Z-AO for Z-Mimic depth cues.