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render-3d-character-explainer

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Assemble an animated character-explainer video ad (~77s, 9:16, any art style: Pixar-style 3D, claymation, anime, paper-cut, felt) on an "N types of X" listicle spine: one recurring human protagonist plus one persona character per list item. Given per-scene clips, a scene timing table and narration, it trims, normalises, concatenates and mixes them, reusing the source ad's audio (restyle) or fresh per-scene voiceover over a music bed (original), loops a scene's keyframe when its clip failed, and burns captions last. Free, deterministic assembly (Python and ffmpeg, no paid calls); the recipe supplies the clips, keyframes, audio and captions. Use for the 3d-character-explainer format.

skills/video/render-3d-character-explainer/SKILL.md

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Nov 11, 2026

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1,315
Repository last updated
Nov 6, 2026
License
MIT

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# render-3d-character-explainer

The free, deterministic renderer for the **3d-character-explainer** video ad format — an
animated character spot (art style is the user's choice; the demo was glossy Pixar-style 3D) built on an **"N types of X" listicle** spine, where a recurring
human protagonist plus a locked cast of **N persona characters (one per list item)** carry a
hook → "deeper story" → cast-reveal → one beat per list item → kicker → product test →
relieved payoff. This capability is the **FREE assembly stage only**. All generative work
(Nano-Banana cast anchors + per-scene keyframes, Kling-V3 i2v clips, ElevenLabs VO + music,
or a source ad's audio reused verbatim) happens upstream in the recipe and is handed to this
capability as files.

It ports the validated compose recipe from the worked example — a "six types" Pixar-style 3D
listicle restyle (`_render_full.sh` — per-scene trim → normalize 1080×1920/fps30 → concat -c copy → mux the
source audio, with a static-still fallback on any failed clip). The assembly is
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