ZDPShift: Beyond the Zero-Disparity Plane in Stereo

Every public stereo benchmark assumes positive disparity valuesd = fB/Z ≥ 0. Mordern stereoscopic display — cinema 3D, VR, HMDs — actively uses d < 0. ZDPShift bridges the gap: the same artist-authored open-movie content rendered at five ZDP shifts Δ ∈ {−16, 0, +16, +24, +32} pixels, giving you a controlled continuum from textbook-positive to substantially-crossed disparities, with analytical ground truth at every pixel.

News:

• [1st July] A technical report is on the way!

The problem in one plot

Every public SOTA fails by 19–60× the instant disparity crosses zero. ZDPShift gives you the data to fix that.

What you get

Split	Source	Scenes	Frames	Pairs	Size
train/	6 Blender open movies	30	4,134	20,670	318 GB
test/	Caminandes Llamigos	4	271	1,355	35 GB

Per pair: left.png + right.png (1920×1280 open-movie) + disparity.npy (signed float32) + meta.json (Δ, focal, baseline, K_L, K_R, % crossed).

Gallery

Geometry

d(Z, Δ) = f · B / Z − Δ                    baseline B = 0.10 m,   Δ ∈ {−16, 0, +16, +24, +32} px

Cameras stay physically parallel — only the principal points shift by ∓Δ/2. Multi-Δ self-consistency d(Δᵢ) − d(Δⱼ) = Δⱼ − Δᵢ holds to a median 0.04 px residual (sub-pixel Cycles noise).

rendered_datasets/<split>/<scene>/frame_<N>_<cam>/shift_{-16,+0,+16,+24,+32}/
                                                      ├── left.png
                                                      ├── right.png
                                                      ├── disparity.npy
                                                      └── meta.json

Render protocol

To keep ground truth well-defined at every pixel, three artist settings are overridden:

• Aperture forced to f/64 — defocus blur kept below sub-pixel
• Motion blur off — fast objects have crisp per-frame correspondences
• Compositor bypassed — no grading / bloom / flare distortion after correspondence

Everything else (lighting, materials, scene composition, camera path, focal length per shot) is inherited from the original .blend unchanged. Cycles 32 spp + OPTIX denoising; sampler noise floor ≈ 0.005/255 per pixel.

License

CC-BY-SA-4.0, inherited from the Blender Studio open movies. Redistribute and adapt with attribution and share-alike.