TEMPORAL DITHER LAB
1-bit sphere.
A 3 × 3 window into every dither × time option. Square pixels, a 1 × 1 × 1 box, shared motion.
Starting renderer…Sphere: 16 latitude divisions. Cube: 8 × 8 black/white checks per face.
Box 1 : 1 : 1 · camera one box width from the opening · opening fills the near plane · bounce in X, Y and Z.
Source raster: 96 × 96. Hidden poses and history are averaged before 1-bit quantization.
Hysteresis affects only “Threshold + hysteresis” and “Bayer 8 + hysteresis”: retain the previous bit within the threshold band. A small band reduces threshold chatter; large bands can lag or stick. No motion reprojection.
Click or press Enter on a variant to select it and enable highlighting. Hover temporarily changes the reference.
The preset uses method order to show fixed blue noise and hysteresis together at 4×, 8× and 16× temporal samples, using 2 × 2 spatial samples and a small ±0.04 band. It avoids adding multi-frame history.
| Method | Time | Pixel flips | Low-change flips | HF error | Tone RMSE | Frames |
|---|
Pixel flips: changed output pixels per frame, over the foreground union. Includes necessary motion.
Low-change flips: switches where the common reference tone and coverage each changed by at most 0.02. A diagnostic for extra chatter, not a motion-compensated measure.
HF error: RMS of [e(t) − 2e(t−1) + e(t−2)] / 4, with e = output − common reference. Emphasizes rapid alternation; a high-pass proxy, not an FFT band measurement.
Tone RMSE: error after a 3 × 3 spatial average, against the same current-instant reference. Check this alongside HF: freezing or blurring can lower flips while losing accuracy.
Errors are percentages of the full black–white range. The common 4 × 4 reference reduces source aliasing but is finite and screen-space. Compare the same scene, output rate and settled 60-frame window; blank entries are warming up. Moving the option window resets measurements. Disable live metrics in Display to remove the extra reference-render cost.
Method references: diffusion kernels · void-and-cluster blue noise · spatial versus temporal noise. This demo uses a fixed spatial mask, not animated spatiotemporal blue noise.
Difference overlay off · select a variant to compare.
2×–16× are hidden mesh poses within one output interval, averaged before dithering. History columns average previous output instants. The last column combines both. No motion compensation: exposure and history can blur or trail motion. Differences compare final pixels at the same simulation time, including silhouette changes.
The sphere has 16 latitude bands and 16 mesh latitude subdivisions; the cube has 8 × 8 checks per face. The object bounces in X, Y and depth inside a box of equal width, height and depth. The camera is one box width in front of the opening, which fills the near plane. The L* 50 grey background is separate from the black/white object pixels. Pixel scale is 1–32 physical screen pixels per raster pixel, accounting for display density. Changing scale preserves the source raster and frame history.