How to Use Occlusion Culling to Improve Performance

A game often draws rooms full of geometry the player cannot see because a wall hides it. Occlusion culling skips those, cutting render cost in dense scenes. Here is how to use it.

How to fix it

1. Understand what it adds

Frustum culling already skips off-screen objects; occlusion culling additionally skips on-screen objects fully blocked by others. It pays off in indoor or dense scenes with lots of hidden geometry.

2. Set up occluders and bake

Mark large solid objects as occluders and dynamic objects as occludees, then bake the occlusion data (or use the runtime system). The bake builds the visibility information used to cull.

3. Verify no false culling

Test that objects do not vanish when they should be visible (popping at edges). Tune occluder sizes and the culling settings so you cut hidden objects without culling visible ones.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every your game error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.