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Grow a small closed contour into a layered coral-like form with uneven folds and fine branching edges. A closed curve evolves through neighbor attraction and short-range repulsion in a spatially varying growth field. Long edges receive new vertices as the curve expands. Recent contour histories provide layered ridges around the current outline. Reuse supplied assets or quote new media through PopNow.

Uses PopNow for
Music & voice
Needs
Python 3 · FFmpeg

Generation is optional when you have suitable input material.

v1.0.0 · Updated Oct 25, 2026 · 2.1 MB · Use it for personal and client work; please don't resell or share the package.

What you get

  1. An editable 8-second 720p sample and local MP4 renderer, silent.

  2. Growth rules, edge subdivision and the layered material treatment are already implemented. You can alter the evolving contour through repulsion or spacing instead of drawing a new ornamental outline frame by frame.

  3. A six-frame contact sheet, render receipt and input self-check.

Good for

  • Organic generative-art films with visible growth
  • Comparing curve-growth settings in a reusable art study

Not for

  • This is a two-dimensional curve-growth study, not a biological coral model. It does not guarantee a non-self-intersecting fabrication mesh or simulate volumetric tissue.

How it works

Includes a local renderer

  1. Choose the material

    No image is required. The initial irregular contour, growth field and warm ridge colors are procedural.

  2. Shape the motion

    Edit the documented project controls, then validate the exact settings. Repulsion from 0.3 to 2 changes local separation forces.

  3. Render and review

    Export locally to MP4, inspect the contact sheet and watch the whole film. Check that folds become visibly uneven across the form, that the subject fills the composition and that no edges clip the frame.

How the workflow runs

How Differential Coral Growth works

A closed curve evolves through neighbor attraction and short-range repulsion in a spatially varying growth field. Long edges receive new vertices as the curve expands. Recent contour histories provide layered ridges around the current outline.

What's inside the skill

What you can change

  • Repulsion from 0.3 to 2 changes local separation forces.
  • Split length from 4 to 9 determines when edges receive new vertices.
  • The seed changes the irregular growth field.
  • Coral_color sets the ridge material color.

What to review before delivery

  • The local self-check compares three frame samples after a meaningful input change and rejects its documented invalid case.
  • Output protection rejects overlap with input files and preserves existing sidecars unless overwrite is explicit.
  • Check that folds become visibly uneven across the form, that the subject fills the composition and that no edges clip the frame. This final visual review is manual.

See the package files

These are selected working files from this edition, with their actual role. The complete download also contains instructions and applicable license notices.

  • The task-specific motion mechanism and supported inputs.

    scripts/scene.py

  • Protected MP4 export, contact sheet and hash receipt.

    scripts/runtime.py

  • Editable settings used by the supplied sample.

    examples/project.json

  • Actual changed-frame, invalid-input and output-protection checks.

    scripts/selftest.py

  • Input ranges, material placement and honest limits.

    references/inputs.md

Why use this skill

Start with this package

Growth rules, edge subdivision and the layered material treatment are already implemented. You can alter the evolving contour through repulsion or spacing instead of drawing a new ornamental outline frame by frame.

What PopNow adds

Use PopNow for the missing Music & voice in this workflow. Keep adequate material you already own, then bring new assets back into the editing and assembly steps described here.

Compare the options

A prompt, your own skill, or this workflow?

Start with a prompt

Your agent can create from a plain request. The brief, visual rules, asset choices, output format and review process still need to be established for that project.

Write your own skill

You choose and maintain the reusable instructions, defaults, file structure and checks. This is useful when your process needs different rules or integrations.

A workflow created for PopNow

This workflow was built for PopNow. Its source files, included dependencies and applicable notices are part of the package; the scope described below belongs to this edition.

Guide reviewed Oct 25, 2026

What will this cost?

The contour and material are calculated locally from the project settings. Optional new sound is a separate quoted PopNow request; the example requires no generated imagery.

Generation is optional when you have suitable input material. Free skill. New media is quoted before it runs.

The skill package

Free to install under your account's download allowance. The package license covers your own and client work; redistribution is excluded.

Existing assets and local work

Reusing suitable assets, editing files and running local assembly do not call a PopNow generation model. Your computer and any required runtime still do the work.

New AI images, clips or sound

Quoted for the actual model, inputs, count, duration and resolution. Extra alternatives, revisions or optional enhancement passes can add generation requests.

Your agent and hosting

Any subscription, hosted computer, deployment or other provider fee belongs to that service. Installing this skill does not include those services.

Check the cost of your version first

Your assistant can inspect the available models and quote the exact request first. You choose which optional passes to include and approve spending before generation.

Ask your assistant

  • Use the PopNow skill "Differential Coral Growth" for my project. List the inputs you can reuse, quote only the missing media, show the quoted total and flag any unpriced steps. Separate optional enhancements, and wait for my approval before starting anything paid.

How PopNow billing works

Connections using a PopNow API key, including API-key MCP connections, spend from the separate API balance in USD. A ChatGPT or Claude connection authorized through OAuth spends website credits. These balances are separate; the quote shown by your connection is the approval basis.

Download allowances and current account conditions apply. A free package does not mean unlimited free generation.

See model ratesAPI USD balanceWebsite credit packs

How to use it

You say

  • Use the PopNow skill "Differential Coral Growth" (differential-coral-growth) for this: Render the supplied 8-second example. Make a second version with repulsion set to 0.5. Show the changed motion and quote any missing media before generation.

Then try

  • Show how the changed setting affects the actual motion.

  • Keep my adequate source material and prepare an optional soundtrack quote.

What to have ready

  • No image is required. The initial irregular contour, growth field and warm ridge colors are procedural.
  • Python 3, Pillow, NumPy, FFmpeg and ffprobe
  • The project controls listed in the input contract

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Questions

Is the coral copied from a photograph?

No. A seeded closed contour grows through local forces and edge subdivision. The material is drawn from that evolving curve.

Does this predict how real coral grows?

No. It is a mathematical art study using differential growth ideas, with an authored spatial growth field.

Can I fabricate the result directly?

The output is a video. The curve is not validated as a non-self-intersecting CAD or manufacturing model.

What is already packaged in Differential Coral Growth?

The task-specific motion mechanism and supported inputs. Protected MP4 export, contact sheet and hash receipt. Editable settings used by the supplied sample. Actual changed-frame, invalid-input and output-protection checks. Input ranges, material placement and honest limits.

Which parts of Differential Coral Growth can add a charge?

The contour and material are calculated locally from the project settings. Optional new sound is a separate quoted PopNow request; the example requires no generated imagery. Connections using a PopNow API key, including API-key MCP connections, spend from the separate API balance in USD. A ChatGPT or Claude connection authorized through OAuth spends website credits. These balances are separate; the quote shown by your connection is the approval basis.

How does Differential Coral Growth differ from writing a prompt or my own skill?

Growth rules, edge subdivision and the layered material treatment are already implemented. You can alter the evolving contour through repulsion or spacing instead of drawing a new ornamental outline frame by frame.