pablodawson/MiniMax-H3-360-Orbit-LoRA

MiniMax-H3 360° Orbit LoRA (first–last frame)

A LoRA for MiniMax-H3 (FL2VA variant) that turns one photo into a frozen-time 360° camera orbit, and lands back on the exact frame it started from.

Give the model the same image as the first and the last keyframe, and the LoRA orbits the camera all the way around the subject while the scene stays frozen. The clip closes on its own first frame, so orbits can be chained or stitched into longer shots without a visible seam.

Results

Each comparison shows three renders of the same input with the same seed, prompt, resolution and step count:

left	middle	right
base model, first frame only	base model, first + last frame	base + this LoRA, first + last frame

The previews are downscaled animated WebP. Full-resolution MP4s: comparisons skate · man2 · girl2 · man; LoRA-only clips skate · man2 · girl2 · man.

About the comparisons

• Base, first + last frame: when both keyframes are the same image, the base model reads the clip as a still and barely moves.
• Base, first frame only: the camera moves, but drifts away and never returns to the starting view.
• With the LoRA: the camera travels the full orbit and returns to the starting frame, with smooth motion and no cuts.

Why this LoRA?

Reference-to-video (Ref2VA) treats its input images as loose appearance references, so clips don't end on a known frame and can't be joined cleanly. First–last-frame generation (FL2VA) pins both ends, but out of the box it freezes when both ends are the same image. This LoRA teaches the model a real, geometry-consistent orbit, while FL2VA keyframe pinning at inference keeps both ends exact.

Prompt

Use this prompt verbatim.

One frozen instant. Only the camera moves. In a continuous 360 orbit. Preserve every person and object in exactly the same world position, orientation, shape and pose throughout the shot. Airborne objects remain suspended at the captured height and angle: no wobbling, shaking, spinning, drifting, falling or continued action. Keep faces, hands, clothing, liquids and the background motionless while retaining their natural appearance. Camera parallax is the only source of apparent movement. No cuts, zoom, morphing or added objects.

Recommended settings

setting	value
base weights	MiniMax-H3 FL2VA, pruned (Comfy-Org/MiniMax-H3 int8 ConvRot repack)
keyframes	the same image as first and last frame, for a full 360° loop
resolution	768 × 768
frames	73 (about 3 s at 24 fps)
steps	28
guidance	none. MiniMax-H3 is guidance-distilled, so there is no CFG or negative prompt
LoRA strength	1.0
audio	off

Usage

These weights were trained and tested with ostris/ai-toolkit and its minimax_h3 model extension. The keys use ComfyUI naming (diffusion_model.*).

Training details

Data

Hand-selected high-quality human Gaussian splats collected from the internet, with an orbit video rendered around each one. Because the splats are static 3D scenes, every frame is geometrically consistent by construction. The dataset shows exactly the motion the LoRA should learn: the camera moves and nothing else does.

clips	28 orbit renders
clip format	768 × 768, 73 frames, 24 fps
captions	the single prompt above, for every clip; caption dropout 0.05
audio	none

Hyperparameters

trainer	ostris/ai-toolkit, arch minimax_h3, partition fl2va_pruned
base model	MiniMax-H3 FL2VA pruned, int8 ConvRot (convrot8); Qwen3-VL-32B text encoder in nvfp4
training adapter	ostris/minimax_h3_training_adapter v1, active during training only and not needed for inference
conditioning	first frame of each clip as the keyframe (i2v)
LoRA	rank 16, alpha 16, all transformer linear layers except adaln_proj (208 modules)
steps	3000 (≈107 epochs)
batch size	1, no gradient accumulation
optimizer	AdamW 8-bit, lr 1e-4, weight decay 1e-4
precision	bf16, gradient checkpointing
noise schedule	flow matching, shifted timesteps
loss	MSE, guidance loss target 3.5
resolution buckets	512, 768
hardware	1 × NVIDIA A100 80 GB, 10 h 24 min (about 12.5 s/step)

Limitations

• The domain is narrow. The training data is 28 human-centric square clips of 73 frames. Other subjects, aspect ratios and clip lengths are untested.
• You may still get some subtle movements, blinks, etc.

Author

Pablo Dawson