99 lines
4.8 KiB
Markdown
99 lines
4.8 KiB
Markdown
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# Anti-aliasing
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The **Anti-aliasing** effect softens the appearance of edges in your scene. To do this, it surrounds the edge with similar points of color. This reduces the jagged effect caused by [aliasing](https://en.wikipedia.org/wiki/Aliasing).
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The Post-processing anti-aliasing algorithms are image-based, which is useful when support for traditional multisampling is not available, such as the [deferred rendering](https://docs.unity3d.com/Manual/RenderTech-DeferredShading.html) path. You can configure the rendering settings in the [Quality settings](https://docs.unity3d.com/Manual/class-QualitySettings.html) window.
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The Post-processing stack offers the following anti-aliasing modes:
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- [**Fast Approximate Anti-aliasing (FXAA)**](#fast-approximate-anti-aliasing); a fast algorithm for mobile and platforms that don’t support motion vectors.
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- [**Subpixel Morphological Anti-aliasing (SMAA)**](#subpixel-morphological-anti-aliasing); a high-quality but slower algorithm for mobile and platforms that don’t support motion vectors.
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- [**Temporal Anti-aliasing (TAA)**](#temporal-anti-aliasing); an advanced technique which requires motion vectors. Ideal for desktop and console platforms.
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Each mode is set per-camera in the **Post-process Layer** component.
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<a name="fast-approximate-anti-aliasing"></a>
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## Fast Approximate Anti-aliasing (FXAA)
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**FXAA** is the most efficient anti-aliasing technique. It's ideal for mobile and other platforms that don’t support motion vectors, which are required for **Temporal Anti-aliasing**.
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### Properties
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| Property | Function |
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| :--------- | :----------------------------------------------------------- |
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| Fast Mode | Enable **Fast Mode** for a lower quality but faster variant of FXAA. This option is ideal for mobile platforms. |
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| Keep Alpha | Enable **Keep Alpha** to keep the alpha channel untouched by post-processing. If Keep Alpha is disabled, Unity uses the alpha channel to store internal data used to speed up and improve visual quality. |
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### Performance
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Enable `Fast Mode` if you are developing for mobile devices to get a performance boost. It will also provide a small boost for consoles. `Fast Mode` does not provide any extra benefits for desktop GPUs. In this case regular mode should be used for added visual quality.
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### Requirements
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- Shader Model 3
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<a name="subpixel-morphological-anti-aliasing"></a>
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## Subpixel Morphological Anti-aliasing (SMAA)
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**SMAA** is a higher quality anti-aliasing effect than **FXAA** but it's also slower. Depending on the art-style of your game it can work as well as **Temporal Anti-aliasing** while avoiding some of the shortcomings of this technique.
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### Properties
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| Property | Function |
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| :-------- | :------------------------------------------------ |
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| Quality | Set the overall quality of the anti-aliasing filter. |
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### Performance
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Lowering the `Quality` setting makes the effect run faster. Do not use **SMAA** on mobile platforms.
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### Known issues and limitations
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- SMAA doesn't support AR/VR.
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### Requirements
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- Shader Model 3
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<a name="temporal-anti-aliasing"></a>
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## Temporal Anti-aliasing (TAA)
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**TAA** is an advanced anti-aliasing technique where frames are accumulated over time in a history buffer to be used to smooth edges more effectively. It is substantially better at smoothing edges in motion but requires motion vectors and is more expensive than **FXAA**. It is ideal for desktop and console platforms.
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### Properties
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| Property | Function |
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| :------------------- | :------------------------------------------------------------ |
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| Jitter Spread | Set the diameter (in texels) over which Unity spreads jitter samples. Smaller values result in crisper but a more aliased output. Larger values result in more stable but blurrier output. |
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| Stationary Blending | Set the blend coefficient for stationary fragments. This setting controls the percentage of history sample blended into final color for fragments with minimal active motion. |
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| Motion Blending | Set the blending coefficient for moving fragments. This setting controls the percentage of history sample blended into the final color for fragments with significant active motion. |
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| Sharpness | Set the sharpness to alleviate the slight loss of details in high frequency regions which can be caused by TAA. |
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### Known issues and limitations
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- Not supported on GLES2 platforms.
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- [Universal Render Pipeline (URP)](https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@7.5/manual/index.html) does not support Temporal Anti-aliasing.
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### Requirements
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- Motion vectors
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- Depth texture
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- Shader Model 3
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