Why do objects pop in and out near doorways?

Occlusion culling cells are too coarse. Lower Smallest Occluder to half the doorway width and Smallest Hole to the smallest gap you want visible. Rebake.

Should every object be Static?

Only large opaque environment meshes should be Occluder Static. Player and small props go Occludee Static (they get culled but don't occlude). Skip dynamic objects entirely.

Do lights need flagging too?

Static lights work with baked occlusion. Realtime lights aren't culled by occlusion data; mark accordingly to avoid mismatch with shadow casters that pop.

Fix: Unity Occlusion Culling Pops Near Portals

Quick answer: Window → Rendering → Occlusion. Set Smallest Occluder ~half a doorway, Smallest Hole tighter, Backface Threshold 100 (interiors). Rebake.

Player walks through a door and the next room flickers in. Cells are sized for outdoor space; doorway crossings span multiple cells before culling resolves.

The Symptom

Visible objects appear/disappear at the threshold of a portal as the camera crosses cell boundaries.

The Fix

Window → Rendering → Occlusion (Bake tab):
  Smallest Occluder:    1.0   // half door width
  Smallest Hole:        0.25
  Backface Threshold:   100   // interior

Static flags:
  Walls/floors/ceilings:  Occluder Static + Occludee Static
  Props/decor:            Occludee Static only
  Skinned characters:     none

Smaller occluder/hole settings = denser cell grid = finer culling resolution per door. Bake takes longer but the runtime experience is steady.

Verifying

Toggle Visualization → Visibility Lines while flying through portals. Cells subdivide tightly. No visible-line snap as camera crosses thresholds.

“Tighter cells. Right static flags. Pop disappears.”

Related Issues

For URP decal on skinned, see URP decal. For shader keyword stripping, see keyword strip.

Smaller cells. Static right. No pop.