93f27f802e
Squashed from work; the fine-grained history is under tag archive/work-2026-08-26: - vj: the thumbnail pipeline becomes one honest machine, and effects go livecodable - widgets: boxed labels center on their ink, not on the font's line box - metal: a fresh texture forgets nothing it never had — reallocated vec textures upload whole - fab: a 3D creation shell and the viewer built on it - texcomp: the block codec and the container every texture will travel in - mixer: a live LR-Mix surface for the XR18 — strips paired the way the desk is run, auto-connect, EQ that bends its own curve, and a sweep paced so the console drops nothing
66 lines
2.3 KiB
Bash
Executable file
66 lines
2.3 KiB
Bash
Executable file
#!/bin/sh
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# Fetch the night-sky star panorama the engine's analytic sky can layer
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# over its point stars: NASA/GSFC Scientific Visualization Studio
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# "Deep Star Maps 2020" (svs.gsfc.nasa.gov/4851), celestial-coordinate
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# equirectangular panorama from Gaia DR2 / Hipparcos. Public domain;
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# credit NASA/GSFC SVS.
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#
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# The SVS publishes the map as linear EXR only, so this downloads the 4k
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# EXR (~36 MB, resumable) and converts it to the 4096x2048 sRGB PNG the
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# renderer loads from local/sky/starmap_2020_4k.png (override with
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# MAKEPAD_STAR_MAP). Run from the repo root.
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set -e
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DIR=local/sky
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PNG=$DIR/starmap_2020_4k.png
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EXR=$DIR/starmap_2020_4k.exr
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URL=https://svs.gsfc.nasa.gov/vis/a000000/a004800/a004851/starmap_2020_4k.exr
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mkdir -p "$DIR"
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attribution() {
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cat > "$DIR/ATTRIBUTION.txt" <<'TXT'
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starmap_2020_4k.png: NASA/Goddard Space Flight Center Scientific
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Visualization Studio "Deep Star Maps 2020" (svs.gsfc.nasa.gov/4851),
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celestial-coordinate equirectangular panorama from Gaia DR2 / Hipparcos.
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Public domain; credit NASA/GSFC SVS. Converted to sRGB PNG from the 4k
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EXR by tools/download_stars.sh.
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TXT
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}
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if [ -f "$PNG" ] && [ "$(wc -c < "$PNG")" -gt 2000000 ]; then
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attribution
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echo "already there: $PNG"
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exit 0
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fi
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if ! [ -f "$EXR" ] || [ "$(wc -c < "$EXR")" -lt 35000000 ]; then
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echo "downloading $URL"
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curl -L -C - --fail -o "$EXR" "$URL"
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fi
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SIZE=$(wc -c < "$EXR")
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if [ "$SIZE" -lt 35000000 ]; then
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echo "download incomplete ($SIZE bytes) — re-run to resume" >&2
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exit 1
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fi
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# Linear EXR -> sRGB 8-bit PNG. OpenCV decodes EXR at float precision;
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# the sRGB transfer keeps the faint stars sips' straight conversion loses.
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OPENCV_IO_ENABLE_OPENEXR=1 python3 - "$EXR" "$PNG" <<'PY'
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import sys
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try:
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import cv2, numpy as np
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except ImportError:
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sys.exit("needs python3 with opencv (pip install opencv-python numpy)")
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img = cv2.imread(sys.argv[1], cv2.IMREAD_UNCHANGED)
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if img is None:
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sys.exit("could not decode " + sys.argv[1])
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lin = np.clip(img.astype(np.float64), 0.0, 1.0)
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srgb = np.where(lin <= 0.0031308, lin * 12.92,
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1.055 * np.power(lin, 1 / 2.4) - 0.055)
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cv2.imwrite(sys.argv[2], (srgb * 255.0 + 0.5).astype(np.uint8))
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print("wrote", sys.argv[2], img.shape[1], "x", img.shape[0])
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PY
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attribution
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echo "done: $PNG (+ ATTRIBUTION.txt)"
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