The Buttercup viewer

See the little details.

Play a short eye-tracking clip, explore different views, and take a closer look at what the camera sees.

Explore the different views of this recording.

Your video will appear here—

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Ready for a closer look?

Choose the example or drop a RAW10 photo here.

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Keep playing & explore each view

About this clip & keyboard shortcuts

One clip, multiple views of the same source frames.

Green: retained support · Pink: rejected flat-tire points · Cyan: fitted ellipse

Every five seconds, playback alternates Virtual contact with the next view: Original, Blue filter, Black & white, Flat-tire points, then Brightness. The sequence repeats. Global view loops in place.

1–5 switch views · 6 opens the brightness view · F cycles views · V cycles raw views · Space plays/pauses · ← → step frames

RAW video is decoded locally with Buttercup in Wasm. Overlays are precomputed with Buttercup’s native renderer. Examples are dated research snapshots, not continuously updated benchmarks or a human labeling tool.