Filtering Approaches for Real-Time Anti-Aliasing

Filtering Approaches for Real-Time Anti-Aliasing

http://www.iryoku.com/aacourse/

Filtering Approaches for Real-Time Anti-Aliasing

Distance-to-edge AA (DEAA)

Hugh MalanCCP Games

hmalan@ccpgames.com

Results

Distance to edge

Distance to edge

Distance to edge

Distance to edge

The postprocess

The postprocess

Results

Problems

Undersampling:

• Triangles thinner than a pixel• Long, thin triangles - eg a very long quad• Foreshortened triangles near silhouettes of organic objects, such as

characters• Subpixel gaps

No distance-to-edge information:

• Interpenetrating geometry• Shadow edges• Texture aliasing

Other uses for the DEAA buffer

• Simulate transparency with alpha-to-coverage

• Better alpha-tested edges, eg foliage