Post processing anti-aliasing Heiki Prn Aliasing Aliasing - - PowerPoint PPT Presentation

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Post processing anti-aliasing Heiki Prn Aliasing Aliasing - - PowerPoint PPT Presentation

Sep 21, 2022 255 likes •504 views

Post processing anti-aliasing Heiki Prn Aliasing Aliasing Supersampling Render to some resolution higher than the screen, and then downsample to screen resolution. Computationally expensive. Inefficient.

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Post processing anti-aliasing

Heiki Pärn

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Aliasing

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Aliasing

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Supersampling

  • Render to some resolution higher than the screen, and

then downsample to screen resolution.

  • Computationally expensive.
  • Inefficient.

https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/

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Supersampling

https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/

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Multisample anti-aliasing

  • Coverage and occlusion tests are both performed at

higher-than-normal resolution, which is typically 2x through 8x.

  • Still quite expensive.
  • Incompatible with deferred shading.

https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/

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Multisample anti-aliasing

https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/

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Multisample anti-aliasing

https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/

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Post-processing anti-aliasing

  • Detect edges.
  • Use edge and color information to calculate the exact

fraction of the pixel that will be covered by the triangle.

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https://software.intel.com/sites/default/files/m/d/4/1/d/8/MLAA.pdf

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Post-processing anti-aliasing: advantages

  • No issues with deferred shading.
  • Usually faster than MSAA.
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Post-processing anti-aliasing: disadvantages

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Post-processing anti-aliasing: edge detection

  • color
  • luma
  • depth
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Luma

  • Luma represents the brightness in an image
  • Y' = 0.299 R' + 0.587 G' + 0.114 B'
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FXAA(Fast approXimate AntiAliasing)

  • Single pass
  • Demo at http://tinyurl.com/qawm3rh

http://developer.download.nvidia.com/assets/gamedev/files/sdk/11/FXAA_WhitePaper.pdf

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SMAA(Subpixel Morphological Antialiasing)

  • Based on MLAA.
  • Three passes:

http://www.iryoku.com/smaa/

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http://forums.anandtech.com/showthread.php?t=2266859

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Showing code...

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Thank you

Questions?