FXAA

Fast Approximate Anti-Aliasing (FXAA)

The algorithm

This is a 2D post-process algorithm by NVidia. From the source image, it produces an anti-aliased image using an edge-detection algorithm.

Advantages and disadvantages

The main advantages are:

• It uses less memory with respect to MSAA.

• It anti-aliases everything, not just polygons edges.

The main disadvantages are:

• It blurs the source image a little.

• It cannot fix aliasing problems inherent to the source image.

How to enable

FXAA is enabled from the config file: antialias à fxaa à enable.

Requirements

FXAA can be used when one of the following render pipelines are enabled:

• Default

• DOF HDR B

Parameters

You can set the parameters manually. You can also let the Engine set the parameters through the parameter preset .

quality

Choose the quality preset.

• 10 to 15 - default medium dither (10=fastest, 15=highest quality)

• 20 to 29 - less dither, more expensive (20=fastest, 29=highest quality)

• 39 - no dither, very expensive

• The lowest digit is directly related to performance.

• The highest digit is directly related to style.

subpix

Choose the amount of sub-pixel aliasing removal. This can effect sharpness.

• 1.00 - upper limit (softer)

• 0.75 - default amount of filtering

• 0.50 - lower limit (sharper, less sub-pixel aliasing removal)

• 0.25 - almost off

• 0.00 - completely off

edgeThreshold

The minimum amount of local contrast required to apply algorithm.

• 0.333 - too little (faster)

• 0.250 - low quality

• 0.166 - default

• 0.125 - high quality

• 0.063 - overkill (slower)

edgeThresholdMin

Trims the algorithm from processing darks.

• 0.0833 - upper limit (default, the start of visible unfiltered edges)

• 0.0625 - high quality (faster)

• 0.0312 - visible limit (slower)

• preset must be set to none.

FXAA + DOF HDR B

The FXAA applies to the final scene before the HDR pass. Items such as fluids, refractions, shadows are anti-aliased.

Add an FXAA Post Process Effect to have the final scene completely anti-aliased with FXAA.

You can enable both MSAA and FXAA.