RenderMatte Animal Forest 2K
A synthetic video-matting dataset. Rigged 3D animals are rendered in Blender (Cycles) and composited onto real forest footage, and every frame comes with its 16-bit alpha matte.
Research use only. The animal models and background videos come from the RenderMatte source-asset collection, and not every source-asset license has been reviewed yet. You may use the data for non-commercial research, but do not redistribute it or use it commercially (see
LICENSE).
At a glance
| Clips | 189 = 27 animals × 7 shots (4 full-body + 3 half-body) |
| Backgrounds | 64 real forest video segments. Each segment is used at most 6 times, and no animal reuses a segment. |
| Length | 7 s per clip at the background's own frame rate: 168 frames (24 / 23.976 fps), 175 frames (25 fps) or 210 frames (29.97 / 30 fps) |
| Frames | 36,750 composites + 36,750 mattes |
| Resolution | 1920 × 1080 |
| Size | about 114 GB (composites 109 GB, mattes 3.8 GB, review crops 0.9 GB) |
Layout
One folder per clip, named <animal>__<shot>__v<background id>, for example red_fox_3_3__front_full__v174.
<clip>/
├── composite/frame_0001.png … 1920×1080 RGB, 8-bit: the animal composited onto the background
├── mask/mask_0001.png … 1920×1080 single channel, 16-bit: alpha matte (0 = background, 65535 = animal)
├── check/ three quick-look crops used for manual review (not needed for training)
├── _composite_meta.json per-frame placement, scale, camera-follow and colour settings
└── _qc.json automatic quality-check result (every clip passes)
composite/frame_NNNN.png and mask/mask_NNNN.png with the same number belong together.
Shots:
- Full-body:
side_full,front_full,back_low,back_high,back_away_high,diag_high,diag_arc,side_low_arc,top_down - Half-body:
front_half,side_half,rear_half,diag_half,side_low_half
import cv2, numpy as np
clip = "red_fox_3_3__front_full__v174"
rgb = cv2.imread(f"{clip}/composite/frame_0001.png")[..., ::-1] # H×W×3 uint8, RGB
alpha = cv2.imread(f"{clip}/mask/mask_0001.png", cv2.IMREAD_UNCHANGED) / 65535.0 # H×W float in [0, 1]
How it was made
- Rendering: Blender 5.2.1, Cycles, 32 samples per pixel, filter width 1.5, transparent background. Fur and hair are rendered, with hair dynamics switched off so strands don't streak.
- Alpha: taken directly from the renderer, with no keying, thresholding, feathering or erosion. No shadows and no occlusion: the animal is always the top layer.
- Framing: full-body shots keep the whole animal inside the frame at one fixed scale per clip. Half-body shots are rendered at the final 1920×1080 and pasted 1:1, so the cut through the body always lies on the frame edge.
- Camera motion: the background's camera motion is measured. Full-body ground animals move with the ground so they never slide. Flying animals and half-body shots don't follow the background (half-body reads as a tracking shot).
- Placement: ground animals stand in the lower ground zone of the frame; flying animals are placed in the sky. Walking direction is chosen so it doesn't fight the camera pan.
- Colour: mild grading toward forest light, scaled by the animal's own brightness and colour.
- Backgrounds: screened by eye and with a person/animal detector to exclude real people and animals.
Quality checks
Every clip passed 8 automatic checks:
- frame counts;
- subject size;
- full body not cut by the frame;
- no green or magenta colour cast;
- soft (fur) edges present;
- true 16-bit mattes;
- camera-follow error ≤ 3 px;
- the animal is not clipped by the render frame.
The whole set was also checked for stray non-animal objects in the mattes; none were found.
One clip, Rhinopithecus_Somers__front_half__v050, passes under a documented, manually approved exception: the
subject covers 54% of the frame against a 55% threshold, because the somersault forces a wider fixed half-body
shot. Note also that the somersault animation ends with the monkey seated and still, so most of those 7 clips are
static.
Animals
| Animal | Folder prefix | Type | Clips |
|---|---|---|---|
| African elephant (walk / stop) | JW0K309A0_African_el |
ground | 7 |
| Argali, male (Ovis ammon) | asset_2 |
ground | 7 |
| Bactrian camel (grazing) | JU0L506A1_BactrianCa |
ground | 7 |
| Black jaguar (run) | JW0P2700_BlackJaguar |
ground | 7 |
| Brown bear, female (run) | UrsusArctos_Female_R |
ground | 7 |
| Cattle (looking around) | JU0L419A0_Cattle_Loo |
ground | 7 |
| Egret | Egret_Animated_VFX_G |
flying (aerial backgrounds) | 7 |
| Elk, male (grazing) | JF0L811A4_MaleElk_Ea |
ground | 7 |
| Giant panda (trot) | JF0N2N0K_Panda_Trot |
ground | 7 |
| Giraffe (walk) | Giraffe_Walk_2_83_5 |
ground | 7 |
| Golden snub-nosed monkey (run) | Rhinopithecus_Run_2 |
ground | 7 |
| Golden snub-nosed monkey (somersault) | Rhinopithecus_Somers |
ground | 7 |
| Grey tabby cat (run) | JC0L219A2_GreyTabbyC |
ground | 7 |
| Jaguar (run) | JW0N8300_PantheraOnc |
ground | 7 |
| Labrador retriever (walk) | Dog_Labrador_walking |
ground | 7 |
| Lion, adult (walk) | JF0LA12A9_Lion_Walk |
ground | 7 |
| Lion, young (trot) | JF0M111A0_Lion_Young |
ground | 7 |
| Polar bear (turning) | JF0O8Z0B_PolarBear_3 |
ground | 7 |
| Red fox (walk) | red_fox_3_3 |
ground | 7 |
| Red squirrel (run) | JF0L811A5_RedSquirre |
ground | 7 |
| Red-crowned crane (fly) | JF0LA12A6_Red_crowne |
flying (aerial backgrounds) | 7 |
| Red-crowned crane (fly, second model) | JF0LA12A6_Red_crowne |
flying (aerial backgrounds) | 7 |
| Siberian tiger (lying) | JF0LA12A0_SiberianTi |
ground | 7 |
| Silverback gorilla (chest beat) | JF0N2N0R_SilverbackG |
ground | 7 |
| Steppe eagle (fly) | JF0L810A0_AquilaNipa |
flying (aerial backgrounds) | 7 |
| White horse (run) | JW0N4600_Horse_White |
ground | 7 |
| Wolf (howl) | JF0N2N0G_Wolf_Howl_3 |
ground | 7 |
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