Document sub-pixel morphological antialiasing (SMAA) (#102330)

Author: MJacred

tutorials/3d/3d_antialiasing.rst

@@ -181,6 +181,31 @@ Comparison between no antialiasing (left) and FXAA (right):
 
 .. image:: img/antialiasing_fxaa.webp
 
+Sub-pixel Morphological Antialiasing (SMAA 1x)
+----------------------------------------------
+
+*This is only available in the Forward+ and Mobile renderers, not the Compatibility
+renderer.*
+
+Sub-pixel Morphological Antialiasing is a post-processing antialiasing solution.
+It runs slightly slower than FXAA, but produces less blurriness. This is very helpful
+when the screen resolution is 1080p or below. Just like FXAA, SMAA 1x lacks temporal
+information and will therefore not do much against specular aliasing.
+
+Use SMAA 1x if you can't afford MSAA, but find FXAA too blurry.
+
+Combine it with TAA, or even FSR2, to maximize antialiasing at a higher GPU cost
+and some added blurriness. This is most beneficial in fast-moving scenes or just
+after a camera cut, especially at lower FPS.
+
+SMAA 1x can be enabled in the Project Settings by changing the value of the
+:ref:`Rendering > Anti Aliasing > Quality > Screen Space AA<class_ProjectSettings_property_rendering/anti_aliasing/quality/screen_space_aa>`
+setting to ``SMAA``.
+
+Comparison between no antialiasing (left) and SMAA 1x (right):
+
+.. image:: img/antialiasing_smaa.webp
+
 Supersample antialiasing (SSAA)
 -------------------------------
 
@@ -295,29 +320,29 @@ Antialiasing comparison
 .. The table looks malformed but is not. When making changes, check the nearby
 .. lines for guidance.
 
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Feature                  | MSAA                     | TAA                      | FSR2                     | FXAA                     | SSAA                     | SSRL                     |
-+==========================+==========================+==========================+==========================+==========================+==========================+==========================+
-| Edge antialiasing        | 🟢 Yes                   | 🟢 Yes                   | 🟢 Yes                   | 🟢 Yes                   | 🟢 Yes                   | 🔴 No                    |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Specular antialiasing    | 🟡 Some                  | 🟢 Yes                   | 🟢 Yes                   | 🟡 Some                  | 🟢 Yes                   | 🟢 Yes                   |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Transparency antialiasing| 🟡 Some [1]_             | 🟢 Yes [2]_              | 🟢 Yes [2]_              | 🟢 Yes                   | 🟢 Yes                   | 🔴 No                    |
-|                          |                          |                          |                          |                          |                          |                          |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Added blur               | 🟢 None                  | 🟡 Some                  | 🟡 Some                  | 🟡 Some                  | 🟡 Some [3]_             | 🟢 None                  |
-|                          |                          |                          |                          |                          |                          |                          |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Ghosting artifacts       | 🟢 None                  | 🔴 Yes                   | 🔴 Yes                   | 🟢 None                  | 🟢 None                  | 🟢 None                  |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Performance cost         | 🟡 Medium                | 🟡 Medium                | 🔴 High                  | 🟢 Low                   | 🔴 Very High             | 🟢 Low                   |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Forward+                 | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Mobile                   | ✔️ Yes                   | ❌ No                    | ❌ No                    | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
-| Compatibility            | ✔️ Yes                   | ❌ No                    | ❌ No                    | ❌ No                    | ✔️ Yes                   | ❌ No                    |
-+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Feature                  | MSAA                     | TAA                      | FSR2                     | FXAA                     | SMAA 1x                  | SSAA                     | SSRL                     |
++==========================+==========================+==========================+==========================+==========================+==========================+==========================+==========================+
+| Edge antialiasing        | 🟢 Yes                   | 🟢 Yes                   | 🟢 Yes                   | 🟢 Yes                   |  🟢 Yes                  | 🟢 Yes                   | 🔴 No                    |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Specular antialiasing    | 🟡 Some                  | 🟢 Yes                   | 🟢 Yes                   | 🟡 Some                  |  🟡 Some                 | 🟢 Yes                   | 🟢 Yes                   |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Transparency antialiasing| 🟡 Some [1]_             | 🟢 Yes [2]_              | 🟢 Yes [2]_              | 🟢 Yes                   |  🟢 Yes                  | 🟢 Yes                   | 🔴 No                    |
+|                          |                          |                          |                          |                          |                          |                          |                          |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Added blur               | 🟢 None                  | 🟡 Some                  | 🟡 Some                  | 🟡 Some                  |  🟢 Low                  | 🟡 Some [3]_             | 🟢 None                  |
+|                          |                          |                          |                          |                          |                          |                          |                          |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Ghosting artifacts       | 🟢 None                  | 🔴 Yes                   | 🔴 Yes                   | 🟢 None                  |  🟢 None                 | 🟢 None                  | 🟢 None                  |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Performance cost         | 🟡 Medium                | 🟡 Medium                | 🔴 High                  | 🟢 Very Low              |  🟢 Low                  | 🔴 Very High             | 🟢 Low                   |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Forward+                 | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   | ✔️ Yes                   |  ✔️ Yes                  | ✔️ Yes                   | ✔️ Yes                   |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Mobile                   | ✔️ Yes                   | ❌ No                    | ❌ No                    | ✔️ Yes                   |  ✔️ Yes                  | ✔️ Yes                   | ✔️ Yes                   |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
+| Compatibility            | ✔️ Yes                   | ❌ No                    | ❌ No                    | ❌ No                    |  ❌ No                   | ✔️ Yes                   | ❌ No                    |
++--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+--------------------------+
 
 
 .. [1] MSAA does not work well with materials with Alpha Scissor (1-bit transparency).