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murathany7murathany7/reel-studio/.agents/skills/pick-engine/SKILL.md

pick-engine

Skill5 starsChanged 10 days agoMITView on GitHub

Choose the rendering engine(s) for a video beat or a whole piece - GSAP, SVG rig, Lottie, Rive, Pixi, Three.js, Blender, page capture or footage - from the look wanted, the assets available and the render cost. Use while writing a storyboard or when asked "what should we use for this?

The file

We split this skill into the rules it gives an agent

2 rules. About 0 are common, 1 is distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈1

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    No designer file → SVG rig (engines/svg-rig.js).

    line 20
  2. Distinctive:

    Never use generated footage to show product features.

    line 35

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Picking an engine

The full table and the determinism rules are in engines/README.md. Read it first.

Pick the look first (looks/README.md): it names its usual engines (neon-noir → Three.js emissive + bloom, photoreal → realistic + pbr or Blender Cycles, toon-3d → toon + outline, editorial and kinetic-type → GSAP). Then use the questions below for each beat.

Decide by asking, in order

  1. Is it mostly text, UI or layout? → GSAP only. Most ads are this. Stop here unless a hero visual is needed.
  2. Is there a character?
    • A designer gave a Lottie (.json) → Lottie.
    • A designer gave a Rive (.riv) → Rive (engines/rive.js; state machines take timed inputs).
    • No designer file → SVG rig (engines/svg-rig.js). Draw it from simple shapes in the brand colours.
    • It speaks the voiceover → add lip sync (scripts/lipsync.sh + engines/lipsync.js) to whatever draws it: SVG rig, the brand's mascot PNG, Three.js or Blender. Seconds per line; it is not an extra engine to justify.
  3. Is the hero a physical product or a 3D object?
    • Real CAD or a GLB model, or camera moves around an object → Three.js. Realistic: realistic() + pbr(); glowing: emissive() + bloom().
    • Wants soft light, a premium look, or physics (cloth, liquid, many falling objects) → Blender plate.
    • Cartoon 3D: Three.js toon() + outline() for speed; Blender toon() for quality.
  4. Does the brand already have a live web page with the visual (a 3D scene, a web app)? → page capture. It reuses real work and shows the real product.
  5. Lots of small moving things (confetti, particles, crowds)? → Pixi on top. 5b. Between scenes: a hard cut on the beat (Studio.swap, Studio.bar(n)) is the default. Studio.transition (wipe, iris, push, slide, zoom, whip, blinds, flash) works on any layer; engines/gl-transitions.js (dissolve, ripple, zoom blur, glitch, pixelate) only between layers with pixels (Three.js, Pixi, plates, images).
  6. Real people or places? → footage plate (stock or AI video). Check the brand's compliance on AI disclosure. Never use generated footage to show product features.

Costs to weigh

EngineRender cost (6 s at 1080×1920, M-series Mac)Change cost
GSAP / SVG / Lottie / Pixi / Three.jsseconds (demo: 16 s for 180 frames, all engines)edit HTML, re-render
Blender (Eevee)~9 s per second of video at 540×960 for the simple example scene, including start-up; much more for full size, complex scenes or Cyclesedit the Python scene, re-render the plate, then the composition
Page capture~1 s per frame (the Bike Logger capture took ≈5 min for 28 s)re-drive the page, re-capture

Write the choice down

In the storyboard's Engines field and per beat: the engine and one reason ("Three.js: real CAD of the box, camera orbit"). More than two engines in one piece → justify it or simplify.

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