ComfyUI runs local MiniMax H3 renders for constrained motion studies

• Constrained motion becomes the subject in GlennHasABeard's forest test, where a single stamp grows a forest, and in his rain study, where rain is confined to a bowl.
• Audio becomes a timing track when GlennHasABeard's lemon clip pairs a wet squeeze with glass tinkles, while his fog-jar test uses three squeaks to cue three lid turns.
• Object-specific rules carry the illusion: GlennHasABeard's water-slice clip tells the model that the board stays dry, while his yarn test assigns opposite directions to each end of one strand.
• Local work still brings slow and unreliable runs, with carmidian's timing report describing a 40-minute job becoming 77 minutes and Leonviz's post reporting unwanted voices despite silence prompts.

Comfy-Org's H3 reference-to-video template separates video and audio reference inputs, while its model package README lists several precision variants and 4-step and 8-step Turbo LoRAs. A fog jar counted by squeaks and an H3 camera orbit turned into a Gaussian splat, documented in GlennHasABeard's fog test and akatash23's tutorial, show where local video experiments are heading.

GlennHasABeard's forest test and rain study each use a 15-second locked shot rendered locally in ComfyUI, then upscaled in Topaz to 4K. The prompts make one visual claim at a time:

• Growth: “tiny green trunks” rise from paper, then branches and moss fill in.
• Boundary: rain falls only within a bowl's rim.
• Surface: a finger stroke flips velvet nap into a dark band, then opens a seam of warm light in GlennHasABeard's velvet pass.

The tests assign sound a structural role. In GlennHasABeard's fog jar, three lid squeaks at three seconds become three rotations; the creator attributes the count directly to the audio.

• Layering: the lemon clip combines a wet squeeze under glass tinkles, which GlennHasABeard says establishes both actions at once.
• Sequence: GlennHasABeard's domino study pairs ten one-per-second tinkles with a ten-tile run, even though the second tile becomes a water splash.
• Duration: GlennHasABeard's sand test gives both the cut and the hiss eight seconds, a repeated duration cue.

The prompts add short corrective clauses for things video models tend to simplify.

• Path: GlennHasABeard's ice-plane test reroutes the shaving through the plane's throat and over its top after early takes dropped curls in front of the blade.
• Direction: in his sweater-to-scarf clip, the sweater can only unravel and the scarf can only grow.
• State: GlennHasABeard's sponge render describes golden light as a liquid, so it pours and settles into a level pool.
• Consistency: the water slice stays solid, upright, and dry-boarded in GlennHasABeard's water-slice clip.

Comfy-Org's template supports reference media alongside generation controls. Francky_B's Prompt Composer post adds a ComfyUI layer for swapping subjects with their linked LoRAs and RefMods; its repository includes the add-on and example workflows.

• Character continuity: In Voxyfernus's post, character sheets used as initial and final states produced bad reference style and poor transformations.
• Silence: Leonviz reports in their post that voices persisted after explicit “zero audio” and “no speech” directions.
• Render time: carmidian's report says a 10-second, 1280×736 reference-image-and-audio render rose from roughly 40 minutes to one hour and 17 minutes after workflow updates.

Akatash23's Reddit tutorial turns a local H3 orbit into a Gaussian-splat asset rather than a finished video. Its sequence is specific:

1. Generate a continuous 360-degree orbit with the default FL2VA workflow, using the same still as first and last frame.
2. At 768×1024 and 20 steps without a Lightning LoRA, the author reports about 35 minutes on 12GB of VRAM.
3. Extract frames with ffmpeg, remove duplicated early frames, and replace the first frame with the high-resolution source image.
4. Reconstruct camera poses in COLMAP, then train the splat in Brush.
5. Remove invented background debris in the browser-based SuperSplat editor.

The same tutorial reports that a plausible orbit can still lack geometric consistency, including background colors bleeding into the subject and artifacts around its edges.