Ambient occlusion is one of the most cost-effective visual upgrades you can enable in a game. It adds soft contact shadows where surfaces meet, like the darkened crease where a wall touches the floor or the shadow under a character’s chin. These subtle darkening effects give scenes a sense of depth and grounding that’s immediately noticeable when toggled off. Whether it’s “good” depends on what you’re optimizing for: visual quality, performance, or competitive clarity.
What Ambient Occlusion Actually Does
In the real world, tight corners and crevices receive less light than open, exposed surfaces. Ambient occlusion simulates this by calculating how much light each point in a scene would receive from an overcast sky, where light comes from every direction. Points tucked behind geometry get darkened, while exposed surfaces stay bright. The result is a layer of soft, diffuse shadowing that makes objects look like they physically belong in the scene rather than floating on top of it.
Without ambient occlusion, scenes can look flat and sterile. Walls meet floors with no visual transition. Objects sitting on tables appear pasted in. Enabling it adds the kind of subtle shadow detail your eye expects from real lighting, even if you can’t consciously pinpoint what changed. It’s one of those effects where turning it off makes a bigger impression than turning it on.
Types of Ambient Occlusion and What They Cost
Not all ambient occlusion settings are equal. The acronyms you’ll see in graphics menus represent meaningfully different techniques, and picking the right one can get you better visuals with less performance hit.
SSAO (Screen-Space Ambient Occlusion) is the oldest and cheapest option. It samples your current frame’s depth information to estimate where shadows should fall. It works reasonably well but can produce visual artifacts, especially around screen edges, because it only knows about what’s currently visible on screen. Anything behind you or off-camera doesn’t factor in.
HBAO+ (Horizon-Based Ambient Occlusion Plus) is NVIDIA’s widely adopted improvement over SSAO. It casts deeper, more detailed shadows and accounts for smaller geometry, while often running faster than SSAO implementations pushed to similar quality levels. For most players, HBAO+ hits the sweet spot of visual quality and performance.
GTAO (Ground Truth Ambient Occlusion) is the modern standard in many game engines. Developed by Activision’s research team, it matches a mathematically accurate reference image while running in just half a millisecond per frame on console hardware at 1080p. It uses a horizon-based approach like HBAO but with a more efficient formula that skips the need for approximation shortcuts, producing cleaner results for less computational cost. If a game offers GTAO, it’s typically the best balance of accuracy and speed available.
VXAO (Voxel Ambient Occlusion) takes a fundamentally different approach. Instead of reading your screen’s depth buffer, it builds a 3D voxel representation of the entire scene, including objects behind you and off screen. This eliminates the main weakness of screen-space methods and produces dramatically more accurate shadows in geometry-heavy environments. The trade-off is a heavier GPU load. NVIDIA originally recommended at least a GTX 900 series card, and it remains one of the more demanding options.
RTAO (Ray-Traced Ambient Occlusion) uses hardware-accelerated ray tracing to solve the problem properly. Like VXAO, it works with the full scene rather than just your current view, eliminating the inaccuracies that plague screen-space methods. Shadows appear exactly where real physics would place them. It requires an RTX-class GPU and costs more performance than any screen-space option, but the quality gap is real.
The Performance Question
For most modern GPUs, ambient occlusion at the SSAO or HBAO+ level costs a small, single-digit percentage of your frame rate. GTAO is specifically designed to be cheap enough for demanding console games, clocking in at 0.5 milliseconds per frame. If you’re running a mid-range or better graphics card from the last few years, these options are essentially free in terms of perceived smoothness.
The heavier options like VXAO and RTAO tell a different story. They can shave 5 to 15 percent off your frame rate depending on the scene complexity and your hardware. If you’re already struggling to hold a stable 60 fps, these aren’t worth enabling. But if you have headroom and care about visual fidelity, the improvement in shadow accuracy is substantial.
When You Might Want It Off
Competitive multiplayer is the main scenario where disabling ambient occlusion makes sense. In fast-paced shooters, strong ambient occlusion deepens shadows in corners and recesses, which can make it harder to spot enemies hiding in dark areas. Many competitive players disable it deliberately, prioritizing visibility and frame rate over visual polish. If you’re playing ranked matches in a tactical shooter, turning AO off gives you a marginal but real clarity advantage.
Stylized games are another case where ambient occlusion can work against the art direction. In cel-shaded or flat-shaded visual styles, the naturalistic darkening of AO can clash with the intended look. Cranking it too high in any game can also produce an exaggerated, dirty appearance where every seam and corner looks like it’s caked in grime. As one game developer put it, it’s sometimes “overdone in games, to help things not become bland and boring,” similar to how stage makeup looks exaggerated up close but reads well from a distance. If a scene starts looking like every surface hasn’t been cleaned in years, dialing AO down or switching to a lighter preset helps.
The Best Setting for Most Players
If your game offers HBAO+ or GTAO, pick one of those. They deliver the most noticeable visual improvement relative to their performance cost. SSAO is fine as a fallback if those aren’t available, though it may introduce subtle artifacts around object edges. For ray tracing capable hardware with frames to spare, RTAO is the most physically accurate option and eliminates the screen-space limitations entirely.
The short answer: yes, ambient occlusion is good. It’s one of the highest-impact, lowest-cost graphical settings in most games. The depth and grounding it adds to a scene are disproportionate to the resources it uses, especially with modern implementations. Unless you’re chasing every possible frame in competitive play or the game’s art style specifically clashes with it, leave it on.