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Filtering -Vs- Graphics

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Timothy Lattis

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Description

This is a technical talk by Timothy Lattis on the Neo Graphics channel on what perfect, content-independent filtering would require versus common real-time graphics practice. It uses a ShaderToy worst-case moving high-contrast fence near Nyquist as the testbed.

It covers no antialiasing, 4x and 8x box MSAA, converged high-sample box filters, blue noise and grain, jittered samples, Lanczos and low-pass kernels, and why Nyquist-amplifying sharpeners hurt temporal stability. Game MTF behavior is contrasted with film examples, arguing flicker-free results need softer near-Nyquist response.

It is for advanced rendering engineers who already work with antialiasing and temporal techniques. MSAA and reconstruction-filter vocabulary is assumed.

It is a free YouTube video that points to an accompanying ShaderToy for zoomable inspection, since compression can hide the patterns.

It is useful as a clear demonstration that more samples alone do not fix Nyquist temporal flicker, and that film-like stability implies multipixel edge gradients.