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docs(backlog): local interstellar-dust volume (Edenhofer 2024)#452

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docs(backlog): local interstellar-dust volume (Edenhofer 2024)#452
rulkens merged 1 commit into
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docs/local-dust-volume-backlog

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@rulkens rulkens commented Jul 18, 2026

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Captures the 3D interstellar-dust-map research (from the #401 Powers-of-Ten
dust-map rung) as a needs-design backlog item under Rendering.

Findings in brief:

  • Data: available and ideal — Edenhofer et al. 2023 (Zenodo 10.5281/zenodo.8187943), a Sun-centered per-parsec extinction density field out to 1.25 kpc. Light to acquire: the dustmaps package samples onto our own cartesian grid after a ~3.2 GB one-time fetch. Same Python-extraction pattern as MCPM.
  • Rendering: the scalar-volume stack already exists; adding the field is an ~12-site MCPM-clone. The one real engine gap is the render slab — the raymarch runs on COSMO, whose near plane is 10 kpc, larger than the whole ±1.25 kpc cube, so it'd clip away. Overlaps the star-field-own-slab item; co-design. A second decision is emissive-glow vs Beer–Lambert absorption compositing.

Completes the 10¹⁹ "stars around the Sun" rung (currently buildable).

Adds one terse BACKLOG.md index line + a docs/backlog/ detail write-up. Docs-only.

🤖 Generated with Claude Code

Capture the 3D dust-map research as a needs-design backlog item: the
data is available and ideal (Sun-centered per-parsec extinction density,
~3.2 GB one-time via the dustmaps package), and adding it is an MCPM-clone
scalar field — but it's blocked on a sub-kpc render slab (COSMO's near
plane is 10 kpc, larger than the whole cube) and an emissive-vs-absorptive
compositing decision. Completes the 10^19 rung of the Powers-of-Ten ladder.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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@rulkens
rulkens merged commit dd17f22 into main Jul 18, 2026
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rulkens deleted the docs/local-dust-volume-backlog branch July 18, 2026 15:05
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