Why does my room stay culled after opening a door?

The OcclusionPortal's open state defaults to false. Toggle it from script when the door opens. Without an OcclusionPortal in the doorway, opaque opening counts as solid for occlusion.

How do I add an Occlusion Portal?

Add Component → OcclusionPortal. Position the portal volume covering the doorway opening. Re-bake occlusion. Toggle open in script: occlusionPortal.open = isDoorOpen.

Should I bake or use real-time occlusion?

Bake for static walls (rooms). Portals layer on top to dynamically open paths in baked occlusion. Real-time occlusion (GPU-based) is a separate system.

Fix: Unity Occlusion Portal State Not Updating

Quick answer: Add OcclusionPortal component on a volume sitting in the doorway. Re-bake occlusion. Toggle occlusionPortal.open = true from your door script when the door opens.

Player opens a door but the room behind stays culled. Baked occlusion treats the wall as solid; a portal needs to mark that opening as toggleable.

The Symptom

Geometry beyond a baked occluder doesn’t draw even when the dynamic occluder (door) is “open.” Frame Debugger confirms the geometry is culled.

The Fix

Door GameObject:
  + OcclusionPortal
    Center:        (matches door volume)
    Size:          (matches door opening)
    Open:          false     // initial closed

Bake occlusion (Window → Rendering → Occlusion Culling → Bake).

public class DoorScript : MonoBehaviour
{
    public OcclusionPortal portal;

    public void Open()
    {
        portal.open = true;
        // also play door animation, etc.
    }
}

Open flips the portal open. Occlusion now lets sight pass through the doorway; geometry beyond renders.

Verifying

Stat overlays / Frame Debugger before and after Open. SetPass calls drop with door closed (room behind culled), rise with door open.

“Portal in the doorway. Toggle open. Room beyond renders.”

Related Issues

For Occlusion Culling bake, see bake skipping. For Light Probe out of volume, see probe volume.

Portal toggles. Sight passes.