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DATASET_STATS.json

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+{
+  "schema_version": 1,
+  "dataset": "NeuSky Synthetic",
+  "release_version": "1.0",
+  "generator_commit": "552788ff535a9fc35b087b38d261101b650df922",
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+      "resolution": [
+        1920,
+        1080
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+        "test": 25
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+      "resolution": [
+        1920,
+        1080
+      ]
+    },
+    "interstellar_house": {
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+      "split_counts": {
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+        "validation": 25,
+        "test": 25
+      },
+      "file_count": 952,
+      "resolution": [
+        1920,
+        1080
+      ]
+    }
+  },
+  "totals": {
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+    "frames": 1500,
+    "train_frames": 1250,
+    "validation_frames": 125,
+    "test_frames": 125
+  }
+}

LICENSE.md

@@ -0,0 +1,18 @@
+# NeuSky Synthetic Dataset Licence
+
+The prepared renders, masks, camera metadata, point clouds and ground-truth
+layers in NeuSky Synthetic are licensed under the Creative Commons Attribution
+4.0 International licence:
+
+https://creativecommons.org/licenses/by/4.0/
+
+Copyright 2026 James A. D. Gardner.
+
+Attribution should identify the dataset as "NeuSky Synthetic" and cite the
+accompanying thesis and NeuSky publication.
+
+This licence applies only to the prepared dataset files distributed in the
+public NeuSky Synthetic dataset repository. It does not apply to external
+Poly Haven HDRIs or to the editable third-party scene models referenced by the
+provenance files. The HDRIs are available separately from Poly Haven under
+CC0. The editable scene models are not included in the public dataset.

MANIFEST.json

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+{
+  "schema_version": 1,
+  "dataset": "NeuSky Synthetic",
+  "release_version": "1.0",
+  "generated_on": "2026-07-30",
+  "generator_repository": "https://github.com/JADGardner/neusky",
+  "generator_commit": "552788ff535a9fc35b087b38d261101b650df922",
+  "licence": "CC-BY-4.0",
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+    }
+  ]
+}

README.md

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+---
+pretty_name: NeuSky Synthetic
+license: cc-by-4.0
+size_categories:
+  - 1K<n<10K
+tags:
+  - image
+  - 3d
+  - computer-vision
+  - inverse-rendering
+  - neural-rendering
+  - relighting
+  - intrinsic-decomposition
+  - synthetic
+  - hdr
+  - outdoor-scenes
+---
+
+# NeuSky Synthetic
+
+![NeuSky Synthetic scenes and ground-truth layers](assets/synthetic_dataset_overview.png)
+
+NeuSky Synthetic is a five-scene, multi-illumination outdoor dataset for
+evaluating neural inverse rendering, intrinsic decomposition, novel-view
+synthesis and illumination estimation. It contains 1,500 rendered views at
+1920 x 1080 resolution, with 250 training, 25 validation and 25 test views per
+scene.
+
+This benchmark was developed as a thesis extension to
+[The Sky's the Limit](https://arxiv.org/abs/2311.16937). It was not part of
+the original ECCV 2024 evaluation.
+
+| Property | Value |
+|---|---:|
+| Scenes | 5 |
+| Total views | 1,500 |
+| Training views | 1,250 |
+| Validation views | 125 |
+| Test views | 125 |
+| Resolution | 1920 x 1080 |
+| Illumination environments | 167 |
+| Release | 1.0 |
+| Generator commit | [`552788ff535a9fc35b087b38d261101b650df922`](https://github.com/JADGardner/neusky/tree/552788ff535a9fc35b087b38d261101b650df922) |
+
+## Scenes
+
+- `abandoned_buildings`
+- `apartment_building`
+- `arlanda_uppsala_cathedral`
+- `glass_building`
+- `interstellar_house`
+
+Each scene is rendered under many Poly Haven HDR environments with known
+horizontal rotation. Training views additionally vary camera focal length and
+exposure. Camera intrinsics, camera-to-world transforms, exposure, environment
+identity and environment rotation are recorded per frame.
+
+## Splits And Layers
+
+The training split contains only the inputs used for reconstruction:
+
+- tone-mapped RGB;
+- foreground/sky semantic masks.
+
+Validation and test additionally provide the ground-truth decomposition:
+
+- diffuse albedo;
+- world-space surface normals;
+- metric depth;
+- roughness;
+- metallic;
+- transmission;
+- index of refraction.
+
+Every scene also contains `points3d.ply`, used for scene centring and
+Gaussian-splatting initialisation, and `transforms.json`, containing all camera
+and illumination metadata.
+
+Each independently downloadable archive extracts to:
+
+```text
+scenes/<scene>/
+  transforms.json
+  points3d.ply
+  train/
+    rgb/
+    cityscapes_mask/
+  validation/
+    rgb/
+    cityscapes_mask/
+    albedo/
+    normal/
+    depth/
+    roughness/
+    metallic/
+    transmission/
+    ior/
+  test/
+    <same layers as validation>
+```
+
+The mask images use the Cityscapes colours expected by NeuSky: sky is
+`(70, 130, 180)` and the reconstructed scene is `(70, 70, 70)`.
+
+## Download
+
+Download the complete release with the Hugging Face CLI, verify it, then
+extract the five scene archives:
+
+```bash
+hf download jadgardner/neusky-synthetic \
+  --repo-type dataset \
+  --local-dir neusky-synthetic
+
+(cd neusky-synthetic && sha256sum -c SHA256SUMS)
+for archive in neusky-synthetic/archives/*.tar.zst; do
+  tar --zstd -xf "$archive" -C neusky-synthetic
+done
+```
+
+Download one scene:
+
+```bash
+hf download jadgardner/neusky-synthetic \
+  --repo-type dataset \
+  archives/interstellar_house.tar.zst \
+  --local-dir neusky-synthetic
+
+tar --zstd -xf \
+  neusky-synthetic/archives/interstellar_house.tar.zst \
+  -C neusky-synthetic
+```
+
+Once the repository is public, an individual scene can also be downloaded
+without the CLI:
+
+```bash
+curl -L \
+  "https://huggingface.co/datasets/jadgardner/neusky-synthetic/resolve/main/archives/interstellar_house.tar.zst?download=true" \
+  -o interstellar_house.tar.zst
+```
+
+`zstd` is required for extraction. `MANIFEST.json` records the size and SHA256
+of every release file, and `SHA256SUMS` can be checked before extraction.
+
+## NeuSky
+
+The loader, training code and deterministic generation pipeline are in the
+[NeuSky repository](https://github.com/JADGardner/neusky).
+
+```bash
+git clone --recurse-submodules https://github.com/JADGardner/neusky.git
+cd neusky
+
+PYTHONPATH=. python scripts/train_synthetic.py \
+  --data /path/to/neusky-synthetic/scenes/abandoned_buildings
+```
+
+See `provenance/scene_sources.json` for the source models and scene hashes,
+and `provenance/scene_render_configs.json` for the accepted camera and
+rendering profiles.
+
+## Baseline Results
+
+These are the accepted means over all five scenes. The full per-scene results
+and additional raw/exposure-aligned columns are in
+`benchmark/synthetic_results.csv`.
+
+| Method | Known PSNR EA ↑ | SSIM ↑ | LPIPS ↓ | Left-Half PSNR ↑ | SSIM ↑ | LPIPS ↓ | Albedo PSNR ↑ | Normal MAE ↓ | Depth RMSE ↓ |
+|---|---:|---:|---:|---:|---:|---:|---:|---:|---:|
+| NeuSky | **16.54** | 0.506 | 0.602 | **15.94** | **0.575** | 0.570 | 17.84 | 46.49 | **24.91** |
+| NeRF-OSR | 15.48 | 0.335 | 0.591 | 12.79 | 0.468 | **0.523** | **18.43** | **38.44** | 27.13 |
+| GS-IR | 16.11 | **0.597** | **0.415** | - | - | - | 17.30 | 55.46 | 25.86 |
+
+Known-illumination novel-view synthesis uses the ground-truth HDR environment
+and rotation. Its PSNR is exposure-aligned. In the left-half fitting track,
+illumination is fitted using only the left half of each held-out image and the
+full image is scored. GS-IR has no entry because its scene-wide lighting has
+no per-image estimation mechanism. Decomposition metrics use non-sky,
+valid-object masks; albedo PSNR is scale-aligned and normal MAE is measured in
+degrees.
+
+## Provenance
+
+The 167 HDR environments are CC0 assets from
+[Poly Haven](https://polyhaven.com/). Their identifiers, current download
+metadata and accepted-generation checksums are included under `provenance/`.
+Poly Haven has made minor upstream revisions to 36 EXRs since the accepted
+render. Current upstream files are supported for source re-rendering; this
+prepared release is canonical for reproducing the reported benchmark.
+
+The editable Blender scenes are not included. They contain extractable
+third-party models that cannot be redistributed in source form under their
+licences. `provenance/scene_sources.json` records their authors, source pages,
+licences and accepted scene hashes.
+
+## Licence
+
+The prepared renders, masks, camera metadata, point clouds and ground-truth
+layers in this repository are released under the
+[Creative Commons Attribution 4.0 International licence](https://creativecommons.org/licenses/by/4.0/).
+See `LICENSE.md`.
+
+This licence does not apply to the external HDRIs or editable third-party
+models referenced by the provenance files. The HDRIs are distributed
+separately by Poly Haven under CC0; the editable models are not included.
+
+## Limitations
+
+- The dataset contains five synthetic outdoor architectural scenes and does
+  not represent the full diversity of real outdoor captures.
+- Camera paths are sampled around the principal scene content and do not
+  reproduce a specific handheld capture trajectory.
+- The training data contains deliberately broad illumination and exposure
+  variation; methods assuming a single fixed scene illumination are outside
+  their intended setting.
+- Ground-truth decomposition layers are reserved for validation and test and
+  must not be used as training supervision when reproducing the reported
+  protocol.
+
+## Citation
+
+The synthetic benchmark should be cited as part of the accompanying thesis.
+For NeuSky, cite:
+
+```bibtex
+@inproceedings{gardner2024sky,
+  author    = {James A. D. Gardner and Evgenii Kashin and
+               Bernhard Egger and William A. P. Smith},
+  title     = {The Sky's the Limit: Relightable Outdoor Scenes via a
+               Sky-Pixel Constrained Illumination Prior and Outside-In
+               Visibility},
+  booktitle = {European Conference on Computer Vision},
+  pages     = {126--143},
+  year      = {2024}
+}
+```
+
+Release prepared on 2026-07-30.

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+gs_ir,abandoned_buildings_prepared,16.234020,0.555723,0.405620,,,,15.857445,47.340250,19.285462,12.501215,,25,
+gs_ir,apartment_building_prepared,16.754449,0.659310,0.408453,,,,16.150420,50.694141,26.037688,12.606972,,25,
+gs_ir,arlanda_uppsala_cathedral_prepared,16.939346,0.619973,0.368518,,,,21.168939,56.687720,16.631278,12.825427,,25,
+gs_ir,glass_building_prepared,14.804823,0.560817,0.505912,,,,21.411904,65.848760,39.846867,11.809960,,25,
+gs_ir,interstellar_house_prepared,15.841976,0.590602,0.387943,,,,11.924028,56.709470,27.485566,11.659177,,25,
+gs_ir,mean,16.114923,0.597285,0.415289,,,,17.302547,55.456068,25.857372,12.280550,,,

provenance/POLYHAVEN_SOURCE_AUDIT.md

@@ -0,0 +1,51 @@
+# Poly Haven Source Audit
+
+**Audited:** 2026-07-30
+
+NeuSky Synthetic v1 used 167 Poly Haven HDRIs as 16K EXR files. The accepted
+local files were compared with the current 16K EXR entries returned by the
+official Poly Haven API.
+
+## Result
+
+- 131 files have the same MD5 and byte size as the current upstream file.
+- 36 files have a different MD5 and byte size.
+- Checksums for all accepted files are in `hdris_16k_generation_md5.txt`.
+
+The downloader is resolving the correct asset identifiers, resolution and EXR
+format. The disagreement is therefore not caused by selecting 4K files, adding
+`_16k` to filenames, or downloading a preview.
+
+## Pixel-Level Check
+
+`autumn_park.exr` was downloaded again and compared with the accepted local
+file using OpenImageIO:
+
+| Property | Accepted file | Current upstream file |
+|---|---|---|
+| Resolution | 16384 x 8192 | 16384 x 8192 |
+| Channels | RGB, 32-bit float | RGB, 32-bit float |
+| Compression | PIZ | PIZ |
+| Capture-date metadata | 2021-05-08 | 2024-03-14 |
+
+The image comparison gave:
+
+- mean absolute error: `7.33328e-06`;
+- RMS error: `0.00176769`;
+- maximum absolute error: `1.2109375`;
+- 7,903 changed pixels out of approximately 134 million (`0.00589%`).
+
+This establishes that at least this file changed in image content, not merely
+in metadata or EXR encoding.
+
+## Interpretation
+
+Poly Haven appears to have retouched or reprocessed some HDRIs in place while
+retaining their asset identifiers. This is an inference from the changed
+pixels, file sizes and metadata; the API does not expose an immutable version
+history that identifies the exact upstream operation.
+
+These sparse upstream revisions are accepted for source re-rendering and no
+legacy HDRI bundle is required for the release. The prepared NeuSky dataset
+remains the canonical record for reproducing the reported experiments and
+figures.

provenance/hdris_16k.txt

@@ -0,0 +1,169 @@
+# Poly Haven asset IDs used by NeuSky Synthetic v1.
+# Keep sorted: rendering profiles depend on this ordering and their offsets.
+abandoned_hopper_terminal_03
+abandoned_hopper_terminal_04
+abandoned_parking
+abandoned_slipway
+abandoned_tank_farm_01
+abandoned_tank_farm_03
+abandoned_tank_farm_04
+abandoned_tank_farm_05
+abandoned_waterworks
+approaching_storm
+aristea_wreck
+autumn_park
+autumn_road
+aviation_museum
+aviation_museum_hill
+beach_parking
+bell_park_dawn
+bell_park_pier
+blouberg_sunrise_1
+blouberg_sunrise_2
+blue_lagoon
+blue_lagoon_night
+cannon
+cape_hill
+cayley_lookout
+cedar_bridge
+champagne_castle_1
+circus_maximus_1
+circus_maximus_2
+cloud_layers
+cloudy_cliffside_road
+dam_road
+derelict_highway_noon
+derelict_overpass
+dikhololo_night
+dikhololo_sunset
+dirt_bike_track_01
+dresden_square
+driving_school
+dry_field
+eilenriede_park
+evening_meadow
+evening_road_01
+factory_yard
+fish_hoek_beach
+flower_road
+freight_station
+furry_clouds
+goegap
+gothic_manor_02
+green_point_park
+harties
+hilltop_construction
+hilly_terrain_01
+industrial_sunset
+je_gray_park
+kiara_1_dawn
+kiara_2_sunrise
+kiara_3_morning
+kiara_5_noon
+kiara_7_late-afternoon
+kiara_8_sunset
+kiara_9_dusk
+kloetzle_blei
+kloofendal_38d_partly_cloudy
+kloofendal_48d_partly_cloudy
+kloppenheim_01
+kloppenheim_02
+kloppenheim_03
+kloppenheim_04
+kloppenheim_05
+kloppenheim_06
+kloppenheim_07
+lakes
+lakeside
+learner_park
+lenong_2
+lenong_3
+lilienstein
+lythwood_field
+mall_parking_lot
+mealie_road
+missile_launch_facility_02
+misty_dawn
+monte_scherbelino
+moonless_golf
+moonlit_golf
+mpumalanga_veld
+mud_road
+museumplein
+noga
+noon_grass
+old_outdoor_theater
+ostrich_road
+park_bench
+pink_sunrise
+preller_drive
+pump_station
+quarry_01
+quarry_02
+quarry_03
+quarry_04
+qwantani
+railway_bridge_02
+railway_bridges
+red_hill_curve
+red_hill_straight
+reichstag_1
+rocky_ridge
+rooftop_night
+rooitou_park
+round_platform
+ruckenkreuz
+rural_landscape
+rural_winter_roadside
+rustig_koppie
+satara_night
+satara_night_no_lamps
+shanghai_riverside
+signal_hill_dawn
+signal_hill_sunrise
+simons_town_harbour
+simons_town_rocks
+sisulu
+skate_park
+small_harbor_01
+small_harbor_02
+snow_field
+snowy_field
+solitude_night
+spiaggia_di_mondello
+spruit_dawn
+spruit_sunrise
+stadium_01
+sterkspruit_falls
+straw_rolls_field_01
+suburban_field_01
+suburban_field_02
+sunflowers
+sunset_fairway
+sunset_in_the_chalk_quarry
+syferfontein_0d_clear
+syferfontein_18d_clear
+syferfontein_1d_clear
+syferfontein_6d_clear
+symmetrical_garden
+table_mountain_1
+table_mountain_2
+the_lost_city
+the_sky_is_on_fire
+tiber_island
+tucker_wreck
+umhlanga_sunrise
+veld_fire
+venice_dawn_1
+venice_sunset
+versveldpas
+wasteland_clouds
+waterbuck_trail
+white_cliff_top
+wide_street_01
+wide_street_02
+winter_lake_01
+winter_river
+winter_sky
+yellow_field
+zwinger_night

provenance/hdris_16k_generation_md5.txt

@@ -0,0 +1,167 @@
+2dc1e2bdfcae9766229179b9c2b65765  abandoned_hopper_terminal_03.exr
+6b5ca4aa533c3f040a1952088fbe777a  abandoned_hopper_terminal_04.exr
+d288eaf31bef460f4abf1257ac43219c  abandoned_parking.exr
+38f3b3e5cb5b1a4a3221e68d8ed5a510  abandoned_slipway.exr
+9ec35df561aecc864e60907b87c7a4a2  abandoned_tank_farm_01.exr
+c5793d8ca17323293ea8856f8a8e6531  abandoned_tank_farm_03.exr
+9ee76997367fc023d20b9e145fcb74fc  abandoned_tank_farm_04.exr
+bbe1a9813daa054b8a78df5c617509b5  abandoned_tank_farm_05.exr
+eebef90fbb764c93346f88855dd69118  abandoned_waterworks.exr
+2681545466b44765ff8f13b8d6ffe250  approaching_storm.exr
+0bbfc11ca745eec7cc25a32bd3f8718c  aristea_wreck.exr
+20bc65d440974ae0cf856c4825749b37  autumn_park.exr
+225ac7c547e545517959614204d534f8  autumn_road.exr
+63b5e8cce488e692a7580d1eb02ef902  aviation_museum.exr
+5316791d5e4e29a925745e73e335e445  aviation_museum_hill.exr
+1cbc303ba132160792c36cbec92b9a4d  beach_parking.exr
+cd47eeb2973c03172dcaaf74212c1f56  bell_park_dawn.exr
+6fe8cdc26d7bc4608953f6cd699cb640  bell_park_pier.exr
+9f2adf3e4010ef1c930b653b86e7e637  blouberg_sunrise_1.exr
+8c0abc74cd68ab43139baec102345152  blouberg_sunrise_2.exr
+a732b0f0ccd822a0756832e091fcdd73  blue_lagoon.exr
+05c6968142ad35280bdb15b0ab467d59  blue_lagoon_night.exr
+e22dc6ed4157635f3c469d89980243a9  cannon.exr
+f2bb57cc0da7ad737e9ed270df1eb91a  cape_hill.exr
+486434931af5e04977473b443046bd5f  cayley_lookout.exr
+9f2c1ec0d57267ceb6793e2255b7a76d  cedar_bridge.exr
+04eb69869ecf9dd61c42721e018ca697  champagne_castle_1.exr
+319f0c0f004c3900eb6600f37dcd6d7b  circus_maximus_1.exr
+7b46fff12999b38f298eaf35d22708a9  circus_maximus_2.exr
+1240bcfa4a232532733b96295e456e38  cloud_layers.exr
+5307d6d1575bad4326d69bea36a288a2  cloudy_cliffside_road.exr
+88f58080ae2188c1210fce063afa6ec8  dam_road.exr
+c91d4ae75e8b4f845aa3a33fde3a9b83  derelict_highway_noon.exr
+52a7c8f2ce10256a4ccedb0be7bc30d0  derelict_overpass.exr
+efbc89570228c1231db22a6904c2c06b  dikhololo_night.exr
+274abcee76911635d6aec827ef59f037  dikhololo_sunset.exr
+fc1d7163a70020857012036c408deb96  dirt_bike_track_01.exr
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+9106f4a992e8cdb30baabfb46f5a6da2  driving_school.exr
+3f123121b73f02a2bd5812085514580b  dry_field.exr
+86aea0c2cc7285869934fc0004963479  eilenriede_park.exr
+7fdd87a18e9449619ec300ac700b11ab  evening_meadow.exr
+be253502f0b832f976164afe248b83f1  evening_road_01.exr
+a11870ab6876f3763b620df9ebae022c  factory_yard.exr
+a062350d69664423c99e90817110aee2  fish_hoek_beach.exr
+d6dca7db4108365e7a764b2d103353cb  flower_road.exr
+b008a4ef683db12f29f0e37a237f1f72  freight_station.exr
+88ce9319aa626717c31d96b242b0e3fa  furry_clouds.exr
+f3936578425d1262a68a046cd590a56a  goegap.exr
+d8dd928cf20649a5712f9d5c7a0e09bd  gothic_manor_02.exr
+2a70ab6679bce8d205b355e4aaaaa016  green_point_park.exr
+23eec5c9fbb7f95e8886ea6db79657fe  harties.exr
+935f347c029780468312465ecbe68cfa  hilltop_construction.exr
+fa9ca5d050f802e87939c6697b54e74d  hilly_terrain_01.exr
+0e06bba18fc07aae79a3f9f8b432ff01  industrial_sunset.exr
+2b683d271fdaea7624166bdc358a5998  je_gray_park.exr
+a17095920f3b69ec58f2cdabadc0c807  kiara_1_dawn.exr
+0458003eea6e204f2aaad7f4fe58e47e  kiara_2_sunrise.exr
+384dc31da5ee76ff7a2da9b3a92cf730  kiara_3_morning.exr
+674c5eeb6e47c7e09b88f222f27c5145  kiara_5_noon.exr
+d10876a9f878d46f0f40102120221cd4  kiara_7_late-afternoon.exr
+aa2c14cb127de50d9aed77e000d44b7d  kiara_8_sunset.exr
+fc766765c999a0338e7a0671debb0624  kiara_9_dusk.exr
+8025f4354bbf27dec255a2d50ebcee66  kloetzle_blei.exr
+1e8633f0db809a2ea8909f809bbd295e  kloofendal_38d_partly_cloudy.exr
+09a0037557d4dfc60297e7a2a4a8c8e8  kloofendal_48d_partly_cloudy.exr
+2f23ffe7eea600aedbe9ac21563900ce  kloppenheim_01.exr
+54e6ef18c4c84a06d6f4860dd041634a  kloppenheim_02.exr
+969507ccb4737d8decfedb20f011137e  kloppenheim_03.exr
+21b1c249a7479a646e5a6020cba02084  kloppenheim_04.exr
+623cfc566a8101863e0160d091da26e5  kloppenheim_05.exr
+114e27604b723b2f63072404e2a888a9  kloppenheim_06.exr
+3df77b9187d1082ddba73a5d67094009  kloppenheim_07.exr
+6fc1bcf45889f1e07a753715e7112d16  lakes.exr
+3f20324ca883d286dcea13a131c85c89  lakeside.exr
+6fd75a834cf41c0413a682d6a896c2b3  learner_park.exr
+dc783ca3f4f3cd0a0f6c90deb8ee511e  lenong_2.exr
+a90f1ed6412c8554faba1ca0a9f461e3  lenong_3.exr
+844cce5267960784abafe2dcf192aab1  lilienstein.exr
+b0192b23c381f9d61760295eee67f4d5  lythwood_field.exr
+4c0f0bb7dccc0cfe171d791c6a8b74e6  mall_parking_lot.exr
+ef80cfd449657fc4e150b00e62aa7589  mealie_road.exr
+db8a24b443748ef0aa0968d86c551f1c  missile_launch_facility_02.exr
+63dea6890c13a587891206de0917a189  misty_dawn.exr
+8809793e25701af1262999c7f3f42860  monte_scherbelino.exr
+208ace3672d17aad6ef26ccddbb82729  moonless_golf.exr
+6f35f63179fca6bab12da970d8dd4b2b  moonlit_golf.exr
+16ce555a62678dcb6ee95f5e49245ca3  mpumalanga_veld.exr
+2a6e13f9676735fd68e61d0875af84e1  mud_road.exr
+c9d12c7bdf59036060890e01772ec618  museumplein.exr
+2874c960e673b2bf872a3cdac63cd810  noga.exr
+29b333c4b12292a33dfc24eb8857da6b  noon_grass.exr
+cb3b42be06293cbd99ca4745ea7a6f22  old_outdoor_theater.exr
+ebc7619a194350c9bf74c64e0646041b  ostrich_road.exr
+b09f4db0fc7473004f2f33a2abd66d8d  park_bench.exr
+fc3fb63fc01df17f9c2be462f5c9c97f  pink_sunrise.exr
+3f0af345d1ee4df2ec8b62bb7bf37bf1  preller_drive.exr
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+d4ad882270332ce2d1e4f0a27940148a  quarry_01.exr
+1b8c9e85387d094a26e168a45e34bdc9  quarry_02.exr
+9e8a7fff9590b19de851c6a30bec365b  quarry_03.exr
+2c63a1e4ec59919e689e15fe6f30acac  quarry_04.exr
+5ef830a11f644e8faa849f044cbba1d2  qwantani.exr
+53fb5d3b38edb11da26f9ec9cf230749  railway_bridge_02.exr
+da6985be234cc31bdae8cd54e84e71bf  railway_bridges.exr
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+90d65816a82ead03dafdf486d26b8fee  red_hill_straight.exr
+28652c0cb7cfc258dbc76aac279ffd98  reichstag_1.exr
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+0b953d4ca6bccf1f9ec5ad745c33997b  rooftop_night.exr
+0fdf8dd6579bf0b3736fb5186846cc34  rooitou_park.exr
+b25026d0f20c0e86a882426609deaa85  round_platform.exr
+2b1ca4a0f14c451f12e3a3f0b382f54a  ruckenkreuz.exr
+0fa28c32483af83f534b93793b44cd91  rural_landscape.exr
+5da1c2d36c85baa4decbac115f9f50d1  rural_winter_roadside.exr
+03c803b6b3eff8d67c768c7f54fce0ac  rustig_koppie.exr
+3981bca7309239153d4bea3dc435ef8b  satara_night.exr
+e48e2bc9a8f1d38f05c2d730ba87e08d  satara_night_no_lamps.exr
+19cc5ccf1deab1108383efe8638f6eeb  shanghai_riverside.exr
+74f69825d5f79bc5af0f6e1de41cd8aa  signal_hill_dawn.exr
+74a6c2f811b0c0d0e771a979bbde3efd  signal_hill_sunrise.exr
+0faf4810ca2d56a92dd5ef7f92ca3500  simons_town_harbour.exr
+9c5f9bfaa7b0705d7ee4517fbf6d4dc8  simons_town_rocks.exr
+33a8ba5741a92f505665bd9e4d2c283e  sisulu.exr
+b134e72113f99758e403c88dae469d46  skate_park.exr
+849f60ed00f33988713d5d7bc9fc3650  small_harbor_01.exr
+507fdcdbcfc413a0287c5a437dcf406e  small_harbor_02.exr
+26c2a334d4b4a44e4f5e046f272c711b  snow_field.exr
+5b3dca174a7454ddcde0448f9e162986  snowy_field.exr
+5305779aeb8923a105ca0c4474c9b223  solitude_night.exr
+f37794a08c64a89e8516e88b6245394a  spiaggia_di_mondello.exr
+e03ba6c486f04185965157ed1048e1e2  spruit_dawn.exr
+0a575e7d0b0bd38bdb81fbe00dd261be  spruit_sunrise.exr
+d73e838f3c2637660eac662d7c429408  stadium_01.exr
+eb2d817c367c7cf655366c150f607d6d  sterkspruit_falls.exr
+7080e65df6aea629aaf35c3992fa3ef3  straw_rolls_field_01.exr
+37cccdce7c9312ddce5c088ee4157d0d  suburban_field_01.exr
+0a344382e650fd267baa888f53e89334  suburban_field_02.exr
+4be88d89c6d9994516b24ca0011a5be6  sunflowers.exr
+f9a348209ee87290816725b8b039955c  sunset_fairway.exr
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+fb45be0e7816e378406056353be1f37e  syferfontein_0d_clear.exr
+bfefb875c41151aa50d06ef346d95856  syferfontein_18d_clear.exr
+856b24185dc0a47add5398fa7799c27e  syferfontein_1d_clear.exr
+d1482423fd9e13d407c7aeb597afe259  syferfontein_6d_clear.exr
+8bace81d2671cec4bdefbcfd014750b3  symmetrical_garden.exr
+7265b39619ad06c8d91e746b616429b5  table_mountain_1.exr
+8f11d008d2667b997d35536e48a92ef0  table_mountain_2.exr
+c045489d292639ba74ac844ec1c117c0  the_lost_city.exr
+192daada4e4770dffa5101b7070390a3  the_sky_is_on_fire.exr
+f76b5e26ec948be67b77ddcc1ec7630d  tiber_island.exr
+3d3e28b36bee846d97dfe326f356da4e  tucker_wreck.exr
+a5d842ad7484426c804249e0a3f8c0af  umhlanga_sunrise.exr
+6d27cd701924a407ddcd2aca561fe769  veld_fire.exr
+6da0777594f931c70313ea202587ff82  venice_dawn_1.exr
+a95c0208e7c268fa701a52dbf3916c44  venice_sunset.exr
+602dd9fa7dd6b4ca5a9470a232d478db  versveldpas.exr
+962b835b331220fdf3158c56b67bd5c8  wasteland_clouds.exr
+b6471efa3e227e09d138d9e8175670e2  waterbuck_trail.exr
+fe5ccd9ae3223d269a856027223dd4b5  white_cliff_top.exr
+7b1d7888dc716a84b40ef8c2ff7857f7  wide_street_01.exr
+6a0f42620063c68acbd82eac96fcc44b  wide_street_02.exr
+15330f8b35d5bcf0163f1fcf9b875bb5  winter_lake_01.exr
+91e82fcdaf2d0572a18055d87f0661ab  winter_river.exr
+1192f031962d7b432246ff943f5c2a0d  winter_sky.exr
+67c4002b984b27478d485b10c7e4f609  yellow_field.exr
+facb1fd3821275d3a490df3a8119e110  zwinger_night.exr

provenance/hdris_16k_manifest.json

@@ -0,0 +1,1014 @@
+{
+  "schema_version": 1,
+  "source": "https://polyhaven.com/hdris",
+  "api": "https://api.polyhaven.com/files/{asset_id}",
+  "license": "CC0",
+  "resolution": "16k",
+  "format": "exr",
+  "count": 167,
+  "total_bytes": 51891828238,
+  "assets": [
+    {
+      "asset_id": "abandoned_hopper_terminal_03",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/abandoned_hopper_terminal_03_16k.exr",
+      "size": 300468871,
+      "md5": "2dc1e2bdfcae9766229179b9c2b65765"
+    },
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+      "asset_id": "tucker_wreck",
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+      "size": 277503509,
+      "md5": "3d3e28b36bee846d97dfe326f356da4e"
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+      "asset_id": "umhlanga_sunrise",
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+      "asset_id": "veld_fire",
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+      "size": 328935124,
+      "md5": "6d27cd701924a407ddcd2aca561fe769"
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+      "asset_id": "venice_dawn_1",
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+      "size": 260902426,
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+      "size": 249914749,
+      "md5": "ac5a91508a26f55e4d56d223d86a429e"
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+      "asset_id": "versveldpas",
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+      "size": 300378209,
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+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/waterbuck_trail_16k.exr",
+      "size": 285270135,
+      "md5": "b6471efa3e227e09d138d9e8175670e2"
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+      "asset_id": "white_cliff_top",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/white_cliff_top_16k.exr",
+      "size": 253126475,
+      "md5": "fe5ccd9ae3223d269a856027223dd4b5"
+    },
+    {
+      "asset_id": "wide_street_01",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/wide_street_01_16k.exr",
+      "size": 260655471,
+      "md5": "e1ebc47ba34c7872eae46cd91bd660a8"
+    },
+    {
+      "asset_id": "wide_street_02",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/wide_street_02_16k.exr",
+      "size": 319430772,
+      "md5": "a01591be54b0655da0f923c2874e83db"
+    },
+    {
+      "asset_id": "winter_lake_01",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/winter_lake_01_16k.exr",
+      "size": 235750479,
+      "md5": "15330f8b35d5bcf0163f1fcf9b875bb5"
+    },
+    {
+      "asset_id": "winter_river",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/winter_river_16k.exr",
+      "size": 237877833,
+      "md5": "91e82fcdaf2d0572a18055d87f0661ab"
+    },
+    {
+      "asset_id": "winter_sky",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/winter_sky_16k.exr",
+      "size": 328689205,
+      "md5": "1192f031962d7b432246ff943f5c2a0d"
+    },
+    {
+      "asset_id": "yellow_field",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/yellow_field_16k.exr",
+      "size": 335745422,
+      "md5": "67c4002b984b27478d485b10c7e4f609"
+    },
+    {
+      "asset_id": "zwinger_night",
+      "url": "https://dl.polyhaven.org/file/ph-assets/HDRIs/exr/16k%2B/zwinger_night_16k.exr",
+      "size": 323633807,
+      "md5": "25b16dd9863c09efc058c86e32b91407"
+    }
+  ]
+}

provenance/scene_render_configs.json

@@ -0,0 +1,48 @@
+{
+  "_comment": [
+    "Per-scene camera configuration for the NeuSky synthetic dataset.",
+    "Single source of truth for render geometry - used by render_eval_views.py",
+    "(and should replace the shell arrays in submit_renders.sh on the next",
+    "cluster render). 'geometry' args are shared by every render of the scene.",
+    "Profiles (composed by render_eval_views.py):",
+    "  train         = common.train + scene.train: varied views, focal 35-70mm,",
+    "                  exposure +-1.5EV, close-ups allowed (production profile).",
+    "  train_curated = common.train_curated + scene.eval: whole-building framing",
+    "                  with train's focal/exposure variation; seed/hdri offset",
+    "                  differ from eval so cameras and lighting do not overlap.",
+    "  eval          = common.eval + scene.eval: whole-building framing, fixed",
+    "                  40mm focal and fixed exposure for clean eval metrics."
+  ],
+  "common": {
+    "train": "--camera_height_min 0.5 --camera_height_max 2.0 --resolution 1920 1080 --samples 128 --hdri_16k --focal_mm_range 35 70 --exposure_range -1.5 1.5 --min_building_fraction 0.1 --seed 42",
+    "eval": "--camera_height_min 0.5 --camera_height_max 2.0 --resolution 1920 1080 --samples 128 --hdri_16k --focal_mm 40 --seed 1042 --hdri_offset 137",
+    "train_curated": "--camera_height_min 0.5 --camera_height_max 2.0 --resolution 1920 1080 --samples 128 --hdri_16k --focal_mm_range 35 70 --exposure_range -1.5 1.5 --seed 7 --hdri_offset 150"
+  },
+  "scenes": {
+    "arlanda_uppsala_cathedral": {
+      "geometry": "--sphere_center 0 0 20 --min_clearance 5 --exclude_box -50 -22 45 22",
+      "train": "--sphere_radius 80 --sphere_radius_min 25 --look_at 0 0 20 --look_at_z_range 2 40 --look_at_bias 0.3",
+      "eval": "--sphere_radius 75 --sphere_radius_min 40 --look_at 0 0 22 --look_at_z_range 10 40 --look_at_bias 0.1 --min_building_fraction 0.3"
+    },
+    "interstellar_house": {
+      "geometry": "--sphere_center 0 0 7 --min_clearance 5",
+      "train": "--sphere_radius 50 --sphere_radius_min 5 --look_at_building --building_clearance 5",
+      "eval": "--sphere_radius 50 --sphere_radius_min 36 --look_at 0 0 6 --look_at_z_range 4 9 --min_building_fraction 0.3"
+    },
+    "apartment_building": {
+      "geometry": "--sphere_center 0 0 7 --min_clearance 5",
+      "train": "--sphere_radius 50 --sphere_radius_min 5 --look_at_building --building_clearance 5",
+      "eval": "--sphere_radius 42 --sphere_radius_min 26 --look_at 0 0 6 --look_at_z_range 4 9 --min_building_fraction 0.3"
+    },
+    "abandoned_buildings": {
+      "geometry": "--sphere_center 0 0 7 --min_clearance 10",
+      "train": "--sphere_radius 50 --sphere_radius_min 5 --look_at_building --building_clearance 5",
+      "eval": "--sphere_radius 50 --sphere_radius_min 36 --look_at 0 0 6 --look_at_z_range 4 9 --min_building_fraction 0.3"
+    },
+    "glass_building": {
+      "geometry": "--sphere_center 0 0 7 --auto_exclude",
+      "train": "--sphere_radius 50 --sphere_radius_min 5 --look_at_building --building_clearance 5",
+      "eval": "--sphere_radius 50 --sphere_radius_min 32 --look_at 0 0 6 --look_at_z_range 4 9 --min_building_fraction 0.3"
+    }
+  }
+}

provenance/scene_sources.json

@@ -0,0 +1,199 @@
+{
+  "schema_version": 1,
+  "audited_on": "2026-07-30",
+  "dataset": "NeuSky Synthetic v1",
+  "licence_notes": {
+    "poly_haven": {
+      "licence": "CC0",
+      "licence_url": "https://polyhaven.com/license",
+      "redistributable": true
+    },
+    "blenderkit": {
+      "licence": "Royalty Free",
+      "licence_url": "https://www.blendkit.com/terms-and-conditions-2026/",
+      "redistributable_as_editable_scene": false,
+      "reason": "The terms permit redistribution only as part of a project from which the product cannot be separated. The source models remain extractable from the accepted .blend scenes."
+    },
+    "artstation": {
+      "licence": "Standard Use License",
+      "licence_url": "https://www.artstation.com/marketplace-product-eula",
+      "redistributable_as_editable_scene": false
+    }
+  },
+  "shared_poly_haven_assets": [
+    {
+      "asset_id": "tree_small_02",
+      "type": "model",
+      "resolution": "1k",
+      "url": "https://polyhaven.com/a/tree_small_02"
+    },
+    {
+      "asset_id": "boulder_01",
+      "type": "model",
+      "resolution": "1k",
+      "url": "https://polyhaven.com/a/boulder_01"
+    },
+    {
+      "asset_id": "shrub_04",
+      "type": "model",
+      "resolution": "1k",
+      "url": "https://polyhaven.com/a/shrub_04"
+    },
+    {
+      "asset_id": "island_tree_01",
+      "type": "model",
+      "resolution": "1k",
+      "url": "https://polyhaven.com/a/island_tree_01"
+    },
+    {
+      "asset_id": "coastal_cliff_04",
+      "type": "model",
+      "resolution": "8k",
+      "url": "https://polyhaven.com/a/coastal_cliff_04"
+    },
+    {
+      "asset_id": "modular_fort_01",
+      "type": "model",
+      "resolution": "8k",
+      "url": "https://polyhaven.com/a/modular_fort_01"
+    },
+    {
+      "asset_id": "patterned_cobblestone",
+      "type": "texture",
+      "resolution": "8k",
+      "url": "https://polyhaven.com/a/patterned_cobblestone"
+    },
+    {
+      "asset_id": "concrete_floor_02",
+      "type": "texture",
+      "resolution": "2k",
+      "url": "https://polyhaven.com/a/concrete_floor_02"
+    },
+    {
+      "asset_id": "grass_path_2",
+      "type": "texture",
+      "resolution": "2k",
+      "url": "https://polyhaven.com/a/grass_path_2"
+    },
+    {
+      "asset_id": "cobblestone_floor_04",
+      "type": "texture",
+      "resolution": "2k",
+      "url": "https://polyhaven.com/a/cobblestone_floor_04"
+    }
+  ],
+  "scenes": {
+    "abandoned_buildings": {
+      "accepted_scene": {
+        "filename": "abandoned_buildings.blend",
+        "size_bytes": 369879503,
+        "sha256": "d7ed8b9e8e28d9d4c579c3c46855895b760588b89c97bf571bb88af3febe4487"
+      },
+      "base_model": {
+        "title": "Building Pack Lowpoly",
+        "author": "Fridqeir Haynura",
+        "provider": "BlenderKit",
+        "listing_url": "https://www.blendkit.com/asset-gallery-detail/57b02da8-288e-4bf3-b326-b1fdddac89de/",
+        "listing_id": "57b02da8-288e-4bf3-b326-b1fdddac89de",
+        "cached_asset_id": "13aa072b-63a8-41d1-9dfc-de4e5993b188",
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+        "source_sha256": "9332a01cbe05d8e1708255b6a1d1a010b3ebcbbcbd7c24d8bbade2a53530121d",
+        "availability": "available_on_2026-07-30",
+        "licence": "BlenderKit Royalty Free"
+      },
+      "ground_asset_id": "cobblestone_floor_04",
+      "scene_setup": "scene_setup/setup_scene.py"
+    },
+    "apartment_building": {
+      "accepted_scene": {
+        "filename": "apartment_building.blend",
+        "size_bytes": 497554471,
+        "sha256": "9aacc8d61fa2230cb41156031dc88045275bf7aad4e9d66efc8fa4b6653905c4"
+      },
+      "base_model": {
+        "title": "Modern Apartment Building",
+        "author": "Pawel Walasiewicz",
+        "provider": "BlenderKit",
+        "listing_url": "https://www.blendkit.com/asset-gallery-detail/b3faf096-32df-466d-b04d-7c8b3b3983df/",
+        "listing_id": "b3faf096-32df-466d-b04d-7c8b3b3983df",
+        "cached_asset_id": "d5727bba-00f9-453b-9318-684c0b229300",
+        "source_filename": "modern-apartment-building_2K_d7b73adf-13bf-41c1-ae09-e44ac245d9a2.blend",
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+        "source_sha256": "aaeff45f4fad208ac5cdf96c1950392bc77b342fee42b0f979056bcf4a33c5d5",
+        "availability": "available_on_2026-07-30",
+        "licence": "BlenderKit Royalty Free"
+      },
+      "ground_asset_id": "concrete_floor_02",
+      "scene_setup": "scene_setup/setup_scene.py"
+    },
+    "arlanda_uppsala_cathedral": {
+      "accepted_scene": {
+        "filename": "arlanda_uppsala_cathedral.blend",
+        "size_bytes": 3087009524,
+        "sha256": "0b8a361cdc8606b2a3cc53fccc72b35058d92708e97fd29b777552bd2778c76a"
+      },
+      "base_model": {
+        "title": "Arlanda Uppsala Cathedral",
+        "author": "Tiv Sol",
+        "provider": "ArtStation Marketplace",
+        "listing_url": "https://www.artstation.com/marketplace/p/MpNz/arlanda-uppsala-cathedral",
+        "viewer_url": "https://sketchfab.com/3d-models/arlanda-uppsala-cathedral-9c91370bec27494ca3c64a3a3ea9964d",
+        "alternative_listing_url": "https://www.cgtrader.com/3d-models/exterior/historic-exterior/arlanda-uppsala-cathedral",
+        "source_filename": "Arlanda_Uppsala_Cathedral.fbx",
+        "availability": "available_for_purchase_on_2026-07-30",
+        "licence": "ArtStation Standard Use License"
+      },
+      "additional_asset_ids": [
+        "modular_fort_01",
+        "coastal_cliff_04",
+        "patterned_cobblestone"
+      ],
+      "scene_setup": "custom_scene_recorded_in_synthetic_scenes.md"
+    },
+    "glass_building": {
+      "accepted_scene": {
+        "filename": "glass_building.blend",
+        "size_bytes": 420745012,
+        "sha256": "de8c5f16f383fa75866fef26ccdb1567ee27858638c1417a72b20bfbdd86c960"
+      },
+      "base_model": {
+        "title": "Modern Glass Building",
+        "author": "Abbos Mirzaev",
+        "provider": "BlenderKit",
+        "listing_url": "https://www.blendkit.com/asset-gallery-detail/dd5d37c8-79e6-4171-81ba-4909aabde32d/",
+        "listing_id": "dd5d37c8-79e6-4171-81ba-4909aabde32d",
+        "cached_asset_id": "4cf3bd15-ad69-4c47-a47f-74149fbe5049",
+        "source_filename": "modern-glass-building_2K_4c17a0b5-cb09-4920-9e41-4ab8104ad0af.blend",
+        "source_size_bytes": 1430259,
+        "source_sha256": "e432c9de987b5a503d5d5afc167b476e13761cdb821bda466b82c19a03e46dab",
+        "availability": "available_on_2026-07-30",
+        "licence": "BlenderKit Royalty Free"
+      },
+      "ground_asset_id": "concrete_floor_02",
+      "scene_setup": "scene_setup/setup_scene.py"
+    },
+    "interstellar_house": {
+      "accepted_scene": {
+        "filename": "interstellar_house.blend",
+        "size_bytes": 559184315,
+        "sha256": "38178e4d0af3ac6deae7ed3c305e6cd507b14cd3e41f2e0550c19cbb7ac7a70d"
+      },
+      "base_model": {
+        "title": "Interstellar Cooper House",
+        "author": "Abin Suresh",
+        "provider": "BlenderKit",
+        "listing_url": "https://www.blendkit.com/asset-gallery-detail/02092ebd-0c3a-4474-9a9d-d54474b01445/",
+        "listing_id": "02092ebd-0c3a-4474-9a9d-d54474b01445",
+        "cached_asset_id": "463125e0-1edb-4679-a43c-fb71afe66960",
+        "source_filename": "interstellar-cooper-house_2K_ae02f51f-7de6-439d-8359-b5f0794b3c9a.blend",
+        "source_size_bytes": 139673764,
+        "source_sha256": "5a0ad27f6b14541705ca6533eeb6280433f4977cbd70271893b2ea59a5fd8c58",
+        "availability": "removed_from_blenderkit_on_2026-07-30",
+        "licence": "BlenderKit Royalty Free"
+      },
+      "ground_asset_id": "grass_path_2",
+      "scene_setup": "scene_setup/setup_scene.py"
+    }
+  }
+}

provenance/synthetic_scenes.md

@@ -0,0 +1,180 @@
+# Synthetic Outdoor Multi-Illumination Scenes
+
+Synthetic datasets for evaluating models' ability to accurately predict materials
+and illumination. Each scene provides ground truth geometry (depth, normals),
+albedo, object masks, and per-frame HDRI environment maps with known rotations.
+
+> **Redistribution note:** The prepared 2D renders and benchmark layers are
+> released publicly. Several editable source scenes incorporate BlenderKit
+> Royalty Free models, which cannot be redistributed as extractable `.blend`
+> assets under the current BlenderKit terms. Keep the source scenes in the
+> private archive unless their authors grant permission. Users rebuilding from
+> source must acquire the listed models under their own BlenderKit accounts.
+> See the [BlenderKit licence](https://www.blenderkit.com/docs/licenses/) and
+> [licensing FAQ](https://www.blenderkit.com/docs/licenses/licensing-faq/).
+> `scene_sources.json` records the exact listing identifiers, source filenames,
+> cached asset identifiers, accepted scene hashes and current availability.
+
+## Dataset Purpose
+
+Test a model's ability to decompose a scene into:
+- **Geometry** — depth and surface normals
+- **Materials** — diffuse albedo, roughness
+- **Illumination** — HDRI environment map identity and orientation
+
+Each frame is rendered under a different HDRI with a random Z-axis rotation,
+so the model must disentangle material appearance from lighting.
+
+---
+
+## Scenes
+
+### Scene 1: Arlanda Uppsala Cathedral (+ Medieval Fort)
+
+- **Blend file**: `data/neusky_synthetic_data/scenes/arlanda_uppsala_cathedral.blend`
+- **Cathedral source**: [Arlanda Uppsala Cathedral on ArtStation](https://www.artstation.com/marketplace/p/MpNz/arlanda-uppsala-cathedral)
+- **Author**: Tiv Sol
+- **Viewer**: [interactive Sketchfab page](https://sketchfab.com/3d-models/arlanda-uppsala-cathedral-9c91370bec27494ca3c64a3a3ea9964d)
+- **License**: ArtStation Standard Use License
+- **Acquired file**: `Arlanda_Uppsala_Cathedral.fbx`
+- **Additional assets**:
+  - [`modular_fort_01`](https://polyhaven.com/a/modular_fort_01) (Poly Haven, CC0) — medieval fort architecture with 8K PBR
+- **External shared assets** (in `background_assets/` and `textures/`):
+  - [`coastal_cliff_04`](https://polyhaven.com/a/coastal_cliff_04) (Poly Haven, CC0) — cliff background geometry
+  - [`patterned_cobblestone`](https://polyhaven.com/a/patterned_cobblestone) (Poly Haven, CC0) — ground material
+- **Note**: This scene has its own ground plane and cliff backdrop (not created by `setup_scene.py`). It requires restricted azimuth (`--azimuth_min -45 --azimuth_max 90`) because cliffs surround the scene on the north and south sides.
+- **Camera params**: `--sphere_radius 80 --sphere_center -30 -28 20 --azimuth_min -45 --azimuth_max 90`
+- **Status**: Integrated into standardised pipeline. Textures remapped and verified. Ready for production render.
+
+### Scene 2: Interstellar Farmhouse
+
+- **Source**: [BlenderKit — Interstellar House](https://www.blenderkit.com/asset-gallery-detail/02092ebd-0c3a-4474-9a9d-d54474b01445/)
+- **Author**: Abin Suresh
+- **License**: Royalty Free (BlenderKit)
+- **Availability**: removed from BlenderKit as of 2026-07-30; the URL is
+  retained as the original provenance record
+- **Faces**: 582,607
+- **Style**: Rural farmhouse, highly detailed, cinematic (Cooper house from Interstellar)
+- **Blend file**: `data/neusky_synthetic_data/scenes/interstellar_house.blend`
+- **Ground texture**: grass_path_2 (Poly Haven CC0)
+- **Status**: Scene set up with PBR ground + background vegetation. Test renders verified. Ready for production render.
+
+### Scene 3: Modern Apartment Building
+
+- **Source**: [BlenderKit — Modern Apartment Building](https://www.blenderkit.com/asset-gallery-detail/b3faf096-32df-466d-b04d-7c8b3b3983df/)
+- **Author**: Pawel Walasiewicz
+- **License**: Royalty Free (BlenderKit)
+- **Faces**: 66,048
+- **Style**: Realistic modern residential building based on real project
+- **Blend file**: `data/neusky_synthetic_data/scenes/apartment_building.blend`
+- **Ground texture**: concrete_floor_02 (Poly Haven CC0)
+- **Status**: Scene set up. Building shifted down to sit flush on ground. Test renders verified. Ready for production render.
+
+### Scene 4: Abandoned Buildings
+
+- **Source**: [BlenderKit — Building Pack Lowpoly](https://www.blenderkit.com/asset-gallery-detail/57b02da8-288e-4bf3-b326-b1fdddac89de/)
+- **Author**: Fridqeir Haynura
+- **License**: Royalty Free (BlenderKit)
+- **Faces**: 8,280
+- **Style**: Historic brick buildings with AI-generated textures, urban/abandoned
+- **Blend file**: `data/neusky_synthetic_data/scenes/abandoned_buildings.blend`
+- **Ground texture**: cobblestone_floor_04 (Poly Haven CC0)
+- **Status**: Scene set up. Test renders verified. Ready for production render.
+
+### Scene 5: Modern Glass Building
+
+- **Source**: [BlenderKit — Modern Glass Building](https://www.blenderkit.com/asset-gallery-detail/dd5d37c8-79e6-4171-81ba-4909aabde32d/)
+- **Author**: Abbos Mirzaev
+- **License**: Royalty Free (BlenderKit)
+- **Faces**: 5,417
+- **Style**: Contemporary glass office building with reflective surfaces
+- **Blend file**: `data/neusky_synthetic_data/scenes/glass_building.blend`
+- **Ground texture**: concrete_floor_02 (Poly Haven CC0)
+- **Status**: Scene set up. Test renders verified. Ready for production render.
+
+## Shared Resources
+
+### HDRIs (Multi-Illumination)
+
+- **Location**: `data/neusky_synthetic_data/hdris_16k/`
+- **Count**: 167 selected EXR files
+- **Source**: Poly Haven (CC0)
+- Each frame uses a different HDRI with a random Z-axis rotation
+- Download with `scripts/synthetic_dataset/download_hdris.py`
+- 36 assets have received minor upstream revisions since the accepted renders;
+  current Poly Haven versions are supported for source re-rendering
+
+### Ground Textures (Poly Haven CC0, 2K)
+
+Located in `data/neusky_synthetic_data/textures/`:
+
+| Texture | Files | Used by |
+|---------|-------|---------|
+| `concrete_floor_02` | diff, nor_gl, rough | Apartment, Glass building |
+| `grass_path_2` | diff, nor_gl, rough | Interstellar house |
+| `cobblestone_floor_04` | diff, nor_gl, rough | Building pack |
+
+### Background Assets (Poly Haven CC0, 1K .blend)
+
+Located in `data/neusky_synthetic_data/background_assets/`:
+
+| Asset | Placement | Count | Scale |
+|-------|-----------|-------|-------|
+| `tree_small_02_1k.blend` | r=80 ring | 12 | 2.0–3.5× |
+| `boulder_01_1k.blend` | r=56 ring | 8 | 3.0–6.0× |
+| `shrub_04_1k.blend` | r=68 ring | 16 | 3.0–5.0× |
+| `island_tree_01_1k.blend` | r=104 ring | 8 | 1.5–2.5× |
+| `boulder_01_1k.blend` | r=80 ring (outer) | 12 | 2.0–4.0× |
+| `coastal_cliff_04_8k.blend` | — | — | — |
+| `rock_face_01_8k.blend` | — | — | — |
+
+The cliff and rock assets (8K, Poly Haven CC0) are available for use as background geometry in any scene. The ground plane (200×200) has terrain deformation: flat within r=80, then smoothstep rise to 15 units at the edges (100×100 vertex grid with smooth shading).
+
+---
+
+## Rendering Pipeline
+
+The accepted camera parameters, frame counts, seeds and post-processing steps
+are defined by `scene_render_configs.json` and
+`rebuild_synthetic_dataset.sh`. Do not reconstruct production commands from
+the historical values in individual scene notes.
+
+```bash
+NEUSKY_SYN_DATA=/path/to/neusky_synthetic_data \
+  scripts/synthetic_dataset/rebuild_synthetic_dataset.sh
+```
+
+See `README.md` for the full directory contract, HDRI restoration procedure
+and selective-scene rebuild syntax.
+
+### Per-frame Metadata
+
+Each frame in `transforms_train.json` includes:
+
+| Field | Description |
+|-------|-------------|
+| `file_path` | Path to rendered image |
+| `transform_matrix` | Camera-to-world 4×4 matrix |
+| `envmap_name` | Poly Haven HDRI asset name (e.g. `abandoned_parking`) |
+| `envmap_url` | Direct Poly Haven link |
+| `envmap_rotation` | Euler XYZ rotation in radians applied to envmap `[0, 0, z]` |
+
+### Output Passes (EXR mode)
+
+| Pass | Format | Description |
+|------|--------|-------------|
+| RGB | RGBA float32 | Linear HDR colour |
+| Depth | float32 | Z-depth from camera |
+| Normal | XYZ float32 | World-space surface normals |
+| Albedo | RGBA float32 | Diffuse colour (Cycles "Diffuse Color" pass) |
+| Alpha | float32 | Object mask (0/1, via transparent film) |
+
+---
+
+## Notes
+
+- Camera and focal-length sampling varies by accepted render profile.
+- The ground plane has terrain deformation (hills rising beyond r=80) plus 5 rings of background vegetation to completely hide the horizon.
+- Each frame uses a different HDRI with a random rotation, so models must disentangle materials from illumination.
+- Point clouds can be extracted from depth maps for initialising Gaussian Splatting.
+- For NeuSky training, images are downscaled 4× (`camera_res_scale_factor=0.25`) to fit in 24GB GPU memory.