Antialiasing

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Anti-Aliasing is a method employed by the 3D API to improve image quality by reducing jagged edges (“jaggies”) or aliasing. There are two main techniques that achieve this: Multi Sample Anti-Aliasing (MSAA) and Super Sampling Anti-Aliasing. A very simplified explanation of the two is that MSAA simply takes many different sub-pixel samples of a given polygon pixel while SSAA multiplies the original samples of all pixels. Because of this MSAA is faster than SSAA while the later also improves surface aliasing and alpha textures.

What’s common to both is that more samples increase the quality of the anti-aliasing while reducing performance. This is what the x2, x4, x6, x8, etc. modifiers mean in your graphics driver control panel and in the r_multiSamples CVar. You should turn off Anti-Aliasing when working with DoomEdit to prevent problems.

See also:

• MSAA in OpenGL
• In-depth SSAA article