96 lines
4.9 KiB
Markdown
96 lines
4.9 KiB
Markdown
# Anti-aliasing
|
||
|
||
The **Anti-aliasing** effect gives graphics a smoother appearance. The 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) shading path, or **HDR** in the **forward rendering path** in Unity 5.5 or earlier. The Editor’s [Quality settings](https://docs.unity3d.com/Manual/class-QualitySettings.html) window is home to these options.
|
||
|
||
For further information on the **Anti-aliasing** effect, see the [Anti-aliasing](https://docs.unity3d.com/Manual/PostProcessing-Antialiasing.html) documentation in the Unity manual.
|
||
|
||
The algorithms available in the post-processing stack are:
|
||
|
||
- **Fast Approximate Anti-aliasing (FXAA)**; a fast algorithm for mobile and platforms that don’t support motion vectors.
|
||
- **Subpixel Morphological Anti-aliasing (SMAA)**; a high-quality but slower algorithm for mobile and platforms that don’t support motion vectors.
|
||
- **Temporal Anti-aliasing (TAA)**; an advanced technique which requires motion vectors. Ideal for desktop and console platforms.
|
||
|
||
They are set per-camera in the **Post-process Layer** component.
|
||
|
||
## Fast Approximate Anti-aliasing (FXAA)
|
||
|
||
**FXAA** is the most efficent technique and is recommended for mobile and other platforms that don’t support motion vectors, which are required for **Temporal Anti-aliasing**.
|
||
|
||
|
||
|
||
|
||
|
||
### Properties
|
||
|
||
| Property | Function |
|
||
| :--------- | :----------------------------------------------------------- |
|
||
| Fast Mode | Enable this checkbox for a lower quality but faster variant of FXAA. Recommended for mobile platforms. |
|
||
| Keep Alpha | Enable this checkbox if you need to keep the alpha channel untouched by post-processing. If disabled, Unity will use the alpha channel to store internal data used to speed up and improve visual quality. |
|
||
|
||
### Performance
|
||
|
||
Enable `Fast Mode` if you are developing for mobile or Nintendo Switch to get a performance boost. It will also provide a small boost for PlayStation 4 and Xbox One development. `Fast Mode` does not provide any extra benefits for desktop GPUs; regular mode should be used for added visual quality.
|
||
|
||
### Requirements
|
||
|
||
- Shader Model 3
|
||
|
||
See the [Graphics Hardware Capabilities and Emulation](https://docs.unity3d.com/Manual/GraphicsEmulation.html) page for further details and a list of compliant hardware.
|
||
|
||
## Subpixel Morphological Anti-aliasing (SMAA)
|
||
|
||
**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.
|
||
|
||
|
||
|
||
|
||
|
||
### Properties
|
||
|
||
| Property | Function |
|
||
| :-------- | :------------------------------------------------ |
|
||
| Quality | Set the overall quality of the anti-aliasing filter. |
|
||
|
||
### Performance
|
||
|
||
Lowering the `Quality` setting makes the effect run faster. Do not use **SMAA** on mobile platforms.
|
||
|
||
### Known issues and limitations
|
||
|
||
- SMAA doesn't support AR/VR.
|
||
|
||
### Requirements
|
||
|
||
- Shader Model 3
|
||
|
||
See the [Graphics Hardware Capabilities and Emulation](https://docs.unity3d.com/Manual/GraphicsEmulation.html) page for further details and a list of compliant hardware.
|
||
|
||
## Temporal Anti-aliasing
|
||
|
||
**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.
|
||
|
||
|
||
|
||
|
||
|
||
### Properties
|
||
|
||
| Property | Function |
|
||
| :------------------- | :------------------------------------------------------------ |
|
||
| Jitter Spread | Set the diameter (in texels) in which jitter samples are spread. Smaller values result in crisper but a more aliased output. Larger values result in more stable but blurrier output. |
|
||
| 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. |
|
||
| 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. |
|
||
| Sharpness | Set the sharpneess to alleviate the slight loss of details in high frequency regions which can be caused by TAA. |
|
||
|
||
### Known issues and limitations
|
||
|
||
- Not supported on GLES2 platforms.
|
||
|
||
### Requirements
|
||
|
||
- Motion vectors
|
||
- Depth texture
|
||
- Shader Model 3
|
||
|
||
See the [Graphics Hardware Capabilities and Emulation](https://docs.unity3d.com/Manual/GraphicsEmulation.html) page for further details and a list of compliant hardware.
|