Add Create Aeronautics - Airship & Expansion v1.0.0 mrpack

- 75 mods for MC 1.21.1 / NeoForge 21.1.248
- Includes flywheel:indirect backend fix + aero-shadow-fix + shader overrides
- build_mrpack.py regenerates the pack from a live Prism instance
- Prism: Add Instance -> Import from ZIP with the raw .mrpack URL

.gitignore

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+# Local machine paths (never commit the live instance or build dirs)
+/.minecraft/
+*.tmp
+__pycache__/

README.md

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+# Create Aeronautics - Airship & Expansion
+
+A curated Minecraft modpack about airships, exploration, and tech progression.
+**Minecraft 1.21.1 / NeoForge 21.1.248** — 75 mods.
+
+## Install (Prism Launcher) — one link
+
+1. Open Prism Launcher → **Add Instance → Import from ZIP**.
+2. Paste the raw URL to the `.mrpack` file in this repository
+   (e.g. `https://raw.githubusercontent.com/<you>/<repo>/main/Create-Aeronautics-Airship-Expansion-1.0.0.mrpack`).
+3. Import. Prism downloads all mods, applies configs/shaders/resource pack, and sets the instance up automatically.
+4. (First launch) Allocate 8 GB RAM in **Settings → Java → Memory**. Requires Java 21.
+
+## What's inside
+
+| Area | Mods |
+|------|------|
+| **Core** | Create 6.0.10, Create Aeronautics 1.3.1 (+Sable 2.0.5), Flywheel (bundled) |
+| **Airships / expansion** | 11 Aeronautics addons, aeroworks, create-simulated-thrusters, create-the-air-war, deployer, simulated-gauges |
+| **Tech** | railways, create-new-age, createbigcannons, createdieselgenerators, copycats, create_connected, Design-n-Decor, create_jetpack |
+| **Magic** | Iron's Spells 'n Spellbooks, Ars Nouveau, patchouli |
+| **Exploration** | Terralith (lithostitched), YUNG's Better Strongholds/Desert Temples/Dungeons, Explorer's Compass, Nature's Compass, Xaero's minimap + world map, waystones |
+| **Survival / QoL** | Tough As Nails, Farmer's Delight, Apotheosis (+ apothic modules), corpse, carry-on, JEI, appleskin, MouseTweaks, Controlling, Jade, WeightedInventory |
+| **Performance** | Sodium, lithium, ferritecore, ImmediatelyFast, entityculling, dynamic-fps, modernfix, Clumps, spark |
+| **Visuals** | Iris + EuphoriaPatcher + Complementary Reimagined (Euphoria-patched) shader, 3D Skin Layers, Fresh Animations (resource pack, enable in-game) |
+
+## Key config already applied
+
+- **Flywheel backend forced to `flywheel:indirect`** — fixes the Create throttle-lever
+  "ghost image" artifact under Iris shaders.
+- **aero-shadow-fix** bundled — fixes the white balloon ghost.
+- Iris is preset to load the included Complementary Reimagined shaderpack.
+- `irisflw replaceCheckerboardTexture = true` for correct textures under shaders.
+
+## After import
+
+- Enable **Fresh Animations** in Options → Resource Packs (ships alongside 3D Skin Layers).
+- If shaders look off, verify the Complementary pack is active in Options → Video Settings → Shader Packs.
+
+## Rebuilding the pack (maintainers)
+
+`python3 build_mrpack.py` regenerates the `.mrpack` from a live instance located at
+`~/.local/share/PrismLauncher/instances/Create Aeronautics - Airship & Expansion/.minecraft`.
+Set `MODS_DIR` / `OVERRIDES` at the top of the script to point at a different instance.
+
+## Known limitations
+
+- Create Aeronautics has *known* visual issues under Iris; the bundled config/mods
+  resolve the most visible ones (balloon + throttle lever). Occasional artifacts on
+  animated Create instances may still appear.
+- Shader uniform warnings in the log (`_flw_cullData`, `flw_frustumPlanes`) from Veil
+  are cosmetic and do not affect rendering on the `indirect` backend.

build_mrpack.py

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+#!/usr/bin/env python3
+"""Rebuild the Create Aeronautics .mrpack from a live Prism instance.
+
+Resolves every mod jar in the instance's mods/ folder to its Modrinth version
+by SHA-1 hash (falling back to a manual CurseForge entry for aero-shadow-fix),
+then packs modrinth.index.json + overrides into a Prism-importable .mrpack.
+"""
+import hashlib, json, os, subprocess, sys, tempfile, zipfile, urllib.request
+
+USER_AGENT = "opencode-pack-builder/1.0"
+INSTANCE = os.path.expanduser(
+    "~/.local/share/PrismLauncher/instances/"
+    "Create Aeronautics - Airship & Expansion/.minecraft"
+)
+MODS_DIR = os.path.join(INSTANCE, "mods")
+OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                   "Create-Aeronautics-Airship-Expansion-1.0.0.mrpack")
+
+# (name in instance, override source path) — shipped as-is into .minecraft
+OVERRIDES = [
+    ("config/flywheel-client.toml",   os.path.join(INSTANCE, "config/flywheel-client.toml")),
+    ("config/iris.properties",        os.path.join(INSTANCE, "config/iris.properties")),
+    ("config/irisflw-client.toml",    os.path.join(INSTANCE, "config/irisflw-client.toml")),
+    ("resourcepacks/FreshAnimations_v1.10.4.zip", os.path.join(INSTANCE, "resourcepacks/FreshAnimations_v1.10.4.zip")),
+    ("shaderpacks/ComplementaryReimagined_r5.8.1 + EuphoriaPatches_1.9.3",
+     os.path.join(INSTANCE, "shaderpacks/ComplementaryReimagined_r5.8.1 + EuphoriaPatches_1.9.3")),
+]
+
+# CurseForge-only mod: project 1641969 (aero-shadow-fix), file 8589529.
+CF_FILES = {
+    "aero-shadow-fix.jar": {
+        "url": "https://www.curseforge.com/api/v1/mods/1641969/files/8589529/download",
+    },
+}
+
+def sha1(path):
+    h = hashlib.sha1()
+    with open(path, "rb") as f:
+        for block in iter(lambda: f.read(65536), b""):
+            h.update(block)
+    return h.hexdigest()
+
+def resolve(sha):
+    url = f"https://api.modrinth.com/v2/version_file/{sha}?algorithm=sha1"
+    req = urllib.request.Request(url, headers={"User-Agent": USER_AGENT})
+    with urllib.request.urlopen(req, timeout=20) as r:
+        d = json.load(r)
+    return d.get("id", ""), d.get("files", [{}])[0].get("url", "")
+
+def main():
+    files = []
+    for fname in sorted(os.listdir(MODS_DIR)):
+        if not fname.endswith(".jar"):
+            continue
+        path = os.path.join(MODS_DIR, fname)
+        fsize = os.path.getsize(path)
+        if fname in CF_FILES:
+            url = CF_FILES[fname]["url"]
+        else:
+            vid, url = resolve(sha1(path))
+            if not url:
+                print(f"!! could not resolve {fname} — add to CF_FILES and rerun")
+                sys.exit(1)
+        files.append({
+            "path": "mods/" + fname,
+            "hashes": {"sha1": sha1(path)},
+            "env": {"client": "required", "server": "optional"},
+            "downloads": [url],
+            "fileSize": fsize,
+        })
+
+    index = {
+        "formatVersion": 1,
+        "game": "minecraft",
+        "versionId": "1.0.0",
+        "name": "Create Aeronautics - Airship & Expansion",
+        "summary": "Airships, exploration & tech. 75 mods for Minecraft 1.21.1 / NeoForge.",
+        "files": files,
+        "dependencies": {"minecraft": "1.21.1", "neoforge": "21.1.248"},
+    }
+
+    with tempfile.TemporaryDirectory() as tmp:
+        with open(os.path.join(tmp, "modrinth.index.json"), "w") as f:
+            json.dump(index, f, indent=2)
+        ov = os.path.join(tmp, "overrides")
+        for name, src in OVERRIDES:
+            dst = os.path.join(ov, name)
+            if os.path.isdir(src):
+                os.makedirs(dst, exist_ok=True)
+                for root, _, fnames in os.walk(src):
+                    for fn in fnames:
+                        sp = os.path.join(root, fn)
+                        dp = os.path.join(dst, os.path.relpath(sp, src))
+                        os.makedirs(os.path.dirname(dp), exist_ok=True)
+                        with open(sp, "rb") as si, open(dp, "wb") as di:
+                            di.write(si.read())
+            else:
+                os.makedirs(os.path.dirname(dst), exist_ok=True)
+                with open(src, "rb") as si, open(dst, "wb") as di:
+                    di.write(si.read())
+        with zipfile.ZipFile(OUT, "w", zipfile.ZIP_DEFLATED) as z:
+            z.write(os.path.join(tmp, "modrinth.index.json"), "modrinth.index.json")
+            for root, _, fnames in os.walk(ov):
+                for fn in fnames:
+                    sp = os.path.join(root, fn)
+                    z.write(sp, os.path.relpath(sp, tmp))
+
+    print(f"Wrote {OUT} ({len(files)} mods, "
+          f"{os.path.getsize(OUT)//1024//1024} MB)")
+
+if __name__ == "__main__":
+    main()