A quick per object culling system. It's completely manual, but could be automated. This was developed specifically for the iPhone, where it is an alternative to the build in occlusion culling. I'll post any updates.
using UnityEngine; using System.Collections; public class RenderCulling : MonoBehaviour { public static RenderCulling RC; int zone = 0; public RenderGroup[] cullObjects; void Awake (){ RC = this; } void Start(){ RefreshCulling(); } public void EnterZone(int id){ zone = id; RefreshCulling(); } void RefreshCulling(){ foreach (RenderGroup cull in cullObjects){ if (cull.zoneId == zone){ foreach (MeshRenderer ren in cull.theRenderers){ ren.enabled = true; } } else{ foreach (MeshRenderer ren in cull.theRenderers){ ren.enabled = false; } } } } } [System.Serializable] public class RenderGroup{ public int zoneId; public MeshRenderer[] theRenderers; }

Attach this to a trigger
using UnityEngine; using System.Collections; public class EnterCulling : MonoBehaviour { public int zoneID; RenderCulling manager; void Start(){ manager = RenderCulling.RC; } void OnTriggerEnter(Collider other){ if(other.gameObject.tag=="Player"){ manager.EnterZone(zoneID); } } }