For most modern 3D games, TAA is the better choice for a stable image in motion; FXAA is the better choice when low overhead, consistent sharpness, and freedom from temporal artifacts matter more. Neither is a universal winner. A well-tuned FXAA pass can look better than poor TAA, while a modern temporal reconstruction solution can surpass both.
FXAA vs TAA at a glance
| Characteristic | FXAA | TAA |
|---|---|---|
| Category | Spatial, single-frame post-process | Temporal filtering using frame history |
| Primary benefit | Low cost and predictable sharpness | More stable edges and less shimmer in motion |
| Main drawback | Cannot reliably solve temporal aliasing; can soften detail | Can cause softness, ghosting and trailing |
| Motion vectors | Not required | Usually required for good reprojection |
| Best fit | Low-end hardware, mobile, high-refresh or competitive play | Foliage-heavy, cinematic and low-resolution 3D scenes |
Epic describes FXAA as a fast spatial post-process, while Unity identifies it as URP’s least resource-intensive option (Epic documentation; Unity URP documentation). TAA combines current pixels with prior-frame information and motion data to stabilize detail.
What anti-aliasing fixes
Rendering a diagonal line or tiny object onto a pixel grid creates stair-stepped edges. As the camera moves, those edges can crawl, flicker or shimmer. Thin branches, wires, fences, hair, particles and distant repeated textures are especially vulnerable. Spatial aliasing is visible in one frame; temporal aliasing is the movement of that error across frames. NVIDIA describes this crawling and shimmering as temporal aliasing (NVIDIA’s graphics guide).
How FXAA works
FXAA examines the rendered image, detects high-contrast edge patterns and blends pixels along the estimated edge direction. It needs no previous frame, motion vectors or special material data. That makes it straightforward and generally inexpensive.
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It is not a uniform blur filter, but selective blending can still soften textures, fine geometry or text—especially at low resolution or with aggressive settings. Because FXAA sees only the current frame, it cannot know whether a pixel will move or flicker next frame. It may reduce jaggedness while leaving foliage and distant wires unstable. Epic notes that FXAA cannot fully prevent temporal aliasing (Epic’s Unreal Engine 4.27 documentation).
How TAA works
TAA distributes samples over time rather than rendering every sample in one frame. A typical implementation:
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- Jitters the camera or sampling pattern slightly.
- Uses depth and motion vectors to reproject the previous frame.
- Blends valid history with the current image.
- Rejects or clamps history where movement, disocclusion or lighting changes make it unreliable.
Unity documents TAA as using a color-history buffer and motion vectors; NVIDIA’s survey describes the approach as temporally amortized supersampling (Unity documentation; NVIDIA Real-Time Graphics Research). The result is usually steadier foliage, wires and sub-pixel geometry, particularly at 1080p or lower internal resolutions.
Image quality: still frames versus motion
Paused screenshots
FXAA often looks sharper in a side-by-side still because it does not accumulate a history of filtered samples. TAA may soften textures, foliage and small geometric features.
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Camera movement
TAA generally wins when the camera pans or turns. Its accumulated samples reduce crawling and flicker; FXAA can leave high-contrast edges shimmering even when they appear crisp when paused.
Moving objects and transparency
TAA can leave a trail when history is reused incorrectly. Fast characters, particles, transparent or masked materials, animated vegetation, reflections, camera cuts and newly exposed surfaces are difficult cases. Missing or inaccurate motion vectors, excessive history weighting and weak neighborhood clamping make the problem worse. Unity specifically warns that fast motion against a contrasting background can produce ghosting (Unity URP documentation).
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Ghosting is an implementation failure mode, not an identical property of every TAA solution. Newer temporal reconstruction systems can reduce it compared with older implementations.
Performance and hardware
FXAA is generally the lower-cost option: usually one lightweight full-screen pass, no history buffer and no motion-vector generation. TAA commonly adds history storage, texture reads, jittered rendering and validation. The actual frame-time difference depends on resolution, GPU, render path, engine, existing motion-vector work, quality settings and whether the temporal method also upscales. Do not assume a fixed percentage.
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At low internal resolutions, TAA can improve stability substantially, but its softness is also easier to notice. At 4K, FXAA may be acceptable in a clean scene with limited thin detail. These are tendencies, not guarantees.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which should you choose?
Choose FXAA when
- You need the lowest likely anti-aliasing overhead.
- You use mobile or low-end hardware.
- TAA ghosting or smearing is more distracting than shimmer.
- You play at high refresh rates and prefer a consistent, crisp response.
- The scene has little foliage, wire-like geometry or distant detail.
Choose TAA when
- You want the cleanest moving image.
- Foliage, fences, wires, hair, particles or sub-pixel geometry dominate the scene.
- Shimmer bothers you more than softness.
- You render at 1080p or below, or use a reduced internal scale.
- The game has accurate motion vectors and effective anti-ghosting.
By genre
- Competitive shooters: Test FXAA, SMAA and no AA at actual play speed. FXAA may avoid trails, while TAA may make distant targets steadier.
- Cinematic action games: TAA or a high-quality temporal upscaler usually provides the more coherent image.
- Racing games: TAA often helps trackside fencing, wires and foliage, but inspect ghosting around fast vehicles.
- Strategy games: FXAA or SMAA can preserve crisp text and static detail; check that post-processing does not filter the interface.
- Mobile: FXAA is often the safer default; Unity recommends it for mobile URP, although a platform-specific temporal solution may be preferable when bandwidth and memory allow.
- VR: Prioritize platform support, stability and latency; monitor recommendations do not automatically transfer to headset rendering.
The label is not the whole implementation
“FXAA” and “TAA” describe families of techniques. History length, jitter, reprojection, sharpening, clamping, material treatment and internal resolution can make two games with the same label look very different. A sharpness slider or post-process chain can also change the result. Judge the implementation in the game you actually play.
Engine-specific controls
Unreal Engine
Open Window → Project Settings → Engine → Rendering; desktop and console controls are in the default rendering settings, with mobile controls in the mobile section. Unreal documents r.FXAA.Quality and r.TemporalAA.Quality. Its FXAA quality values run from 0 (Console) through 5 (PC Extreme dithering using 12 samples; 4, PC Low dithering using 12 samples, is documented as the default). For TAAU, documented values are 0 (input filtering disabled), 1 (input filtering) and 2 (input filtering with mobility-based anti-ghosting). These values apply to Unreal’s implementation and can change between engine versions (Epic’s Unreal Engine documentation).
Unity URP
Select the Camera, then Rendering → Anti-aliasing. Unity 6.1 URP lists FXAA, SMAA, TAA and MSAA. Its documented TAA configuration uses motion vectors and a color-history buffer, and the described setup cannot combine TAA with MSAA or camera stacking. The page contains an inconsistent FXAA click instruction, so verify the exact control in your Unity version rather than assuming that wording applies to every project (Unity URP documentation).
When another technique is better
- SMAA: A useful middle ground when you want cleaner edges than FXAA without temporal trails.
- MSAA: Strong for compatible geometry edges in forward rendering, but it does not solve every texture, shader or transparency aliasing problem. Epic documents these coverage limitations (Epic documentation).
- TSR, DLSS, FSR and XeSS: Temporal reconstruction/upscaling systems, not interchangeable names for native-resolution TAA. They can render internally below display resolution and reconstruct a higher-quality output.
- DLAA: Native-resolution temporal or AI-assisted anti-aliasing when GPU headroom is available.
- Supersampling: Render above native resolution when maximum quality matters more than performance.
How to compare settings fairly
- Keep resolution, render scale, textures, sharpening and other post-processing identical.
- Change only the anti-aliasing option.
- Capture a static scene, then perform a slow pan and a rapid turn.
- Test thin branches, fences, wires, distant repeated patterns, a moving character against a contrasting background, particles and transparent effects.
- Watch for stair-stepping, shimmer, crawling, ghost trails, softness, foliage stability and small-object disappearance.
- Record frame time or frame rate for each option at the display’s actual resolution.
Choose the setting that balances motion stability, retained detail, artifact control, frame time and responsiveness—not the one with the prettiest paused screenshot.
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