regenerate-3d

name	regenerate-3d
description	Build a fully-interactive 3D character-selector experience powered entirely by `vg generate`. Generates stylized characters (FLUX.2 / GPT-Image-2), rigged animated GLBs (Meshy v6), themed companion creatures, per-character PATINA floor textures, looped Seedance video backgrounds, and a Three.js scene with palette swaps, breathing reflections, transition effects and a CREATE-YOUR-OWN flow.

regenerate-3d Skill

Runtime: Asset generation steps use the vg generate CLI (FLUX.2 / GPT-Image-2 / Meshy v6 / Seedance / etc.); the final deliverable is a static HTML page with Three.js and the generated assets bundled in. Install with npm install -g vibedgames (or pnpm dogfood in this repo). The generation credentials live on the vibedgames server, so there is no per-machine setup. See the generate skill for the command reference.

End-to-end recipe to ship a polished, multi-character 3D web experience using generative models. This is the recipe that powers a cyberpunk character selector with 10 unique operatives, each with a matching companion creature, environment-themed floor texture, animated background and color palette.

What it builds

For each character you get:

• A stylized 3D character GLB (rigged + animated, baked into the file)
• A companion creature GLB (small static, themed to match the character)
• A per-character PBR floor (basecolor / normal / roughness / metalness, all generated)
• A looped video background keyed to the biome
• A 3-color palette that drives the whole UI (CSS custom properties)
• A portrait crop for the roster card

All packaged into a single static HTML page with a Three.js scene. ~25–35 MB of GLBs total after compression.

Pipeline

1. GPT-Image-2 → 1024x1536 character full-body T-pose (per character)
2. Meshy v6 → image-to-3d, enable_rigging=true, animation_action_id={chosen}
 → animated GLB (idle, dance, alert, etc.)
3. GPT-Image-2/edit → companion creature image, color-locked to character palette
4. Meshy v6 → image-to-3d, enable_rigging=false → static creature GLB
5. PATINA → fal-ai/patina/material/extract on the character image,
 returns basecolor + normal + roughness + metalness for the floor
6. Seedance 2.0 → fal-ai/bytedance/seedance-2.0/fast/image-to-video, 8s loop
7. gltf-transform CLI → resize 1024 → webp q80 → draco
 (typically 95–96% size reduction, ~400–800 KB final)
8. Three.js scene → MeshStandardMaterial floor with alphaMap circular cutout,
 mirrored reflection (refl.y = root.y, scale.y = -1),
 breathing animation on companions,
 per-character palette via CSS custom properties (--c1/--c2/--c3),
 per-character floor texture swap on character click,
 transition lines + radial flash on swap

Riggable-character rules

Auto-rigging quality is decided at image-generation time. For any character image headed into enable_rigging=true:

• Full-body T- or A-pose, front-facing, arms clearly away from the body, legs separated, symmetric. Whole body in frame — head to feet, no cropped limbs.
• No props, capes, tabards, or long skirts fused into the silhouette — anything that merges limbs into the body confuses the auto-rigger. Give weapons/props to the character afterward as separate meshes if needed.
• Verify the generated image actually shows the pose before spending on the 3D step. Models drift toward action poses; a cool contrapposto shot rigs badly. Regenerate with a stronger pose instruction rather than rigging a bad pose.
• Body plan drives animation choice: the mesh's stance decides how animation presets read. A quadruped walk on an upright dragon looks like a human in a costume; an upright biped clip on a hunched creature warps. Match the animation library entry to the stance you generated.
• Hard-surface armored designs (plate knights, mechs) auto-rig worse than organic silhouettes — budget a retry or prefer visible-anatomy designs.

CREATE-YOUR-OWN flow

Visitors with generation credentials can generate their own character + companion live, in-browser:

flux-2 klein 9b (text-to-image)
 └─ character full-body image
 ├─ Meshy v6 (rigged + animated) → character GLB
 └─ flux-2 klein 9b/edit → companion image
 └─ Meshy v6 (no rig) → companion GLB

Cost: ~$2–3 per generation (4 generation calls). Runs in background, modal closes on Generate so the user can keep using the experience while the gen runs. The CREATE YOUR OWN tile transforms into a loading state, then becomes the new character card with a ↻ re-create button.

Key endpoints used

Step	Endpoint
Character image (curated)	openai/gpt-image-2
Character image (live)	fal-ai/flux-2/klein/9b
Companion image	fal-ai/gpt-image-2/edit or fal-ai/flux-2/klein/9b/edit
3D character/companion	fal-ai/meshy/v6/image-to-3d
Per-character floor PBR	fal-ai/patina/material/extract
Background video	fal-ai/bytedance/seedance-2.0/fast/image-to-video
Logo / icon cleanup	fal-ai/bria/background/remove

Meshy animation IDs

Curated dance / idle action IDs (full list at https://docs.meshy.ai/en/api/animation-library):

ID	Animation
0	Idle (default)
2	Alert
36	Confused (scratch)
48	Mirror viewing
64	All_Night_Dance
405	Joyful_Dance_with_Hand_Sway
591	Hip_Hop_Dance
64–83	Various Pop_Dance variants

Three.js scene notes

• Floor: PlaneGeometry(7, 7, 220, 220) cut into a disc via radial-gradient alphaMap. High tessellation enables real displacementMap (uses basecolor as height).
• Reflection: clone of the root with scale.y = -1, BackSide, depthWrite = false, renderOrder = -1. For characters whose origin is at the feet, refl.position.y = root.position.y produces a visible mirror; the floor's transparent = true; opacity ≈ 0.5 lets it bleed through.
• Breathing: per-frame scale.setScalar(base * (1 + sin(t*1.3)*0.025)) + a small Y bob on companions. The reflection mirrors the bob so the mirror stays consistent.
• Palette swap: :root.style.setProperty('--c1', hex) etc. Every UI element (sparklines, pulses, bars, model pills, edge map dots) derives its color from var(--c1) / var(--c2).
• Floor swap: texLoader.load() 4 PBR maps from assets/floor/{charId}/, dispose old textures, set floorMat.color back to white (since the basecolor is already char-themed).
• Transition: 9 diagonal lines sweep across the viewport (@keyframes tfx-sweep) on character click + a radial flash; bg video crossfades between two <video> elements; character GLB slides out and the new one slides in.

Cost reference (curated build)

For one full character:

Step	Approx. cost
1 GPT-Image-2 (character)	$0.04
1 Meshy v6 rigged + animated	$0.80
1 GPT-Image-2/edit (companion)	$0.04
1 Meshy v6 static (companion)	$0.20
1 PATINA floor (4 maps)	$0.04
1 Seedance fast (bg video)	$0.08
Total per character	~$1.20
10 characters	~$12

Runtime parallelizes well, the original 10-character set was generated in ~10 minutes wall-clock with 9 concurrent jobs per stage.