Epic: Stars up close: a dynamic Sun, and every star from its physical parameters
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Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 25/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- javascript, three.js
- Domain
- computer-graphics
Research direction
This epic is split into children #165, #21, #166, #167, and #168; start with #165, the explicitly identified first task, and read the shared-engine notes in ROADMAP and HDR.md for context. The epic is done when the children deliver the parameter-driven star renderer and the Sun's specified dynamic layers in HDR exposure units; this is broad, multi-stage design work rather than a standalone first contribution.
Written by the indexing model from the issue text.
Description
Track A (rendering fidelity). Split out of #111 (2026-10-06 planning).
Goal
The Sun up close is as alive as the rest of the scene has become: granulation at several scales, sunspots with umbra, penumbra and faculae, a chromosphere, prominences, flares and CMEs, and the corona and solar wind, all in the HDR pipeline's exposure units (#86, HDR.md). And one renderer for every star: approach any catalogue star and it is drawn from its temperature, radius, luminosity class and rotation, not as a recoloured Sun.
Principle
One rendering path with physical parameters (the same rule as the planets' atmospheres): the Sun is the reference case of the star renderer, not a special case. Science first: limb darkening laws by temperature, granule scale from surface gravity, spot coverage and activity by type.
Children (in order)
- #165 The /guide/star demo is broken (bug, first; PR #178)
- #21 photosphere v2: granulation, spots, faculae, limb darkening by temperature (PR #183)
- #166 Every star from its parameters: temperature, radius, class, rotation, activity (PR #184)
- #167 The Sun's dynamic layers: chromosphere, prominences, flares and CMEs
- #168 Corona and solar wind
Shared engine
The parametric body renderer this builds is the one gas giants (#41) and procedural exoplanets (#171) reuse (see ROADMAP, shared engines).
- Dominant language
- JavaScript
- Stars
- 55
- Forks
- 4
- Avg merge
- 10h 12m
- Merged PRs (30d)
- 134
Getting set up
This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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