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MSAA

An anti-aliasing technique that smooths jagged edges by sampling each pixel at several points.

Multisample anti-aliasing tests coverage at multiple sub-positions inside each pixel along edges, then blends the results so diagonal lines look smooth instead of staircased — while shading the pixel interior only once, which keeps it cheaper than brute-force supersampling. Turning on sample-rate (per-sample) shading trades that saving for higher quality by shading each sample. A resolve step later collapses the multiple samples down to the final image.