Lighter mesh for phones: tools/build.py --coarsen N (and UNROLL_STEP) keeps every Nth sampled row and column of a built mesh with the same UV mapping; PHerc0172 lite mesh 527,834 vertices (from 2,082,140), 1.5 MB packed, loaded automatically on phones via geometry.lite (?mesh=full or ?mesh=lite overrides); tear threshold follows the mesh step

README.md

@@ -75,7 +75,7 @@ For testing, `unrollView.damageStats()` reports the counts, the floor height, `s
 From the Space's root, with Python 3, `numpy`, `scipy`, `tifffile`, `Pillow` and `curl`:
 
 1. `python tools/fetch.py` lists the public bucket and downloads the meshes and ink previews into `raw/` (about 110 MB).
-2. `python tools/build.py` writes `data/scroll.bin`, `data/scroll.json`, the atlases and `data/hi/`. It reads the X-ray layer straight from the bucket.
+2. `python tools/build.py` writes `data/scroll.bin`, `data/scroll.json`, the atlases and `data/hi/`. It reads the X-ray layer straight from the bucket. `UNROLL_STEP` (default 3) sets the mesh coarseness; `python tools/build.py --coarsen 2 data/<scroll>` writes a lighter `scroll_lite.*` copy for phones without new downloads.
 3. `python tools/gpu_layer.py` rebuilds the ink_9um (9 µm) layer. It needs the ink_9um output TIFFs in `gpu/wNNN/` (about 25 MB each, not shipped). Regenerate them with the model card's inference command on the surface-volume URLs in `data/gpu/receipts/`.
 
 ## Licence and credits

app.js

@@ -265,8 +265,10 @@ window.__unroll = { scroll: () => ({ key: SCROLL_KEY, id: MAN.id, trusted: TRUST
 
 let M, binBuf = null, texInk, texCT, MESHB = null;
 const blankImg = () => { const c = document.createElement('canvas'); c.width = c.height = 4; return c; };
+// a lighter copy of the mesh (geometry.lite) for phones and low-power devices; ?mesh=full or ?mesh=lite overrides
+const LITE = MAN.geometry.format === 'grid-int16' && !!MAN.geometry.lite && (params.get('mesh') === 'lite' || (MOBILE && params.get('mesh') !== 'full'));
 if (MAN.geometry.format === 'grid-int16') {
-  const g = MAN.geometry;
+  const g = LITE ? { ...MAN.geometry, ...MAN.geometry.lite } : MAN.geometry;
   M = JSON.parse(new TextDecoder().decode(await SRC.bytes(g.index, 6e4)));
   // atlases: WebP first, and the JPG fallback if this browser cannot decode WebP or the file does not arrive
   const atl = async (l) => {
@@ -477,7 +479,8 @@ if (wins.some((w) => !w)) loadFail(`The geometry file has no data for ${ORDER.fi
 let S = 0;
 const gpuIds = OV_IDS;
 const meshes = [];
-const decim = MOBILE ? 2 : 1;
+const decim = MOBILE && !LITE ? 2 : 1;   // the lite mesh is already coarse: use every vertex
+const GSTEP = M.step || 3;   // grid step of the built mesh, in cells
 let Rmax = 0;
 
 // Keep only the real sheet: drop triangle islands (connected through shared vertices) that are tiny next to the
@@ -565,7 +568,7 @@ function gridGeometry(w) {
   if (f0 < C) for (let c = 0; c < f0; c++) colAng[c] = colAng[f0];
   // triangles, skipping holes and tears
   const idx = [];
-  const tear = CELL * 3 * 3.2 * decim;
+  const tear = CELL * GSTEP * 3.2 * decim;
   const d2 = (p, q) => {
     const dx = pos[p * 3] - pos[q * 3], dy = pos[p * 3 + 1] - pos[q * 3 + 1], dz = pos[p * 3 + 2] - pos[q * 3 + 2];
     return dx * dx + dy * dy + dz * dz;
@@ -981,6 +984,7 @@ let fly = null;
 const ROLL_OFFSET = new THREE.Vector3(-105, 52, 235);
 const ROLL_OFFSET_PORTRAIT = new THREE.Vector3(-70, 70, 330);
 const rollOffset = () => (camera.aspect < 1 ? ROLL_OFFSET_PORTRAIT : ROLL_OFFSET);
+window.__unrollLite = LITE;
 function flyTo(pos, tgt, dur = 2.4) {
   fly = { p0: camera.position.clone(), t0: controls.target.clone(), p1: pos, t1: tgt, start: performance.now(), dur: dur * 1000 };
 }

data/PHerc0172/scroll_lite.bin

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2b380ae549563ff6ab147de6ac07e0feba705c9d9c7c8039af3229f52afdff46
+size 3167004

data/PHerc0172/scroll_lite.i16p.gz

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0f4a683f5f2116d115579202b2a4a99637ea47222812656045c957bbf23e4387
+size 1513032

data/PHerc0172/scroll_lite.json

@@ -0,0 +1 @@
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docs/ADDING_A_SCROLL.md

@@ -65,6 +65,7 @@ tools/precompute_template.py       a starting point for turning traced windings
 | `voxelMM` | Scan voxel size in millimetres. Meshes in voxel units are scaled by it. |
 | `base` | Optional folder that asset paths are relative to, itself relative to the manifest. Registry manifests use `"../../"` to reach `data/`. |
 | `geometry.format` | `mesh` (OBJ or PLY per winding) or `grid-int16` (the packed format `tools/build.py` writes; registry only). |
+| `geometry.lite` | Optional, `grid-int16` only: `{ "index", "bin", "binPacked" }` of a coarser copy of the mesh (`python tools/build.py --coarsen 2 data/<scroll>`) that phones load instead. `?mesh=full` or `?mesh=lite` overrides. |
 | `geometry.units` | `voxels` (default) or `mm`. |
 | `geometry.axis` | `z` (default: the scan convention, roll axis along z) or `y`. The page centres the roll on its bounding box. |
 | `geometry.flipV` | Default `true`: OBJ and PLY have v pointing up, so the image's top row is v = 1. Set `false` if your v points down. |

lib/manifest.js

@@ -107,6 +107,12 @@ export function validateManifest(m, opts = {}) {
     ref(g.index, 'geometry.index', ['json']);
     ref(g.bin, 'geometry.bin', ['bin']);
     if (g.binPacked !== undefined) ref(g.binPacked, 'geometry.binPacked', ['gz']);
+    if (g.lite !== undefined) {
+      const l = g.lite || {};
+      ref(l.index, 'geometry.lite.index', ['json']);
+      ref(l.bin, 'geometry.lite.bin', ['bin']);
+      if (l.binPacked !== undefined) ref(l.binPacked, 'geometry.lite.binPacked', ['gz']);
+    }
   }
   if (g.format === 'mesh') {
     if (g.units !== undefined && !['voxels', 'mm'].includes(g.units)) E('"geometry.units" must be "voxels" or "mm".');

scrolls/PHerc0172/manifest.json

@@ -10,7 +10,15 @@
   "index": "data/PHerc0172/scroll.json",
   "bin": "data/PHerc0172/scroll.bin",
   "sizeHint": 12492840,
-  "source": "Vesuvius Challenge 7.91 µm tifxyz meshes, decimated by tools/build.py"
+  "source": "Vesuvius Challenge 7.91 µm tifxyz meshes, decimated by tools/build.py",
+  "lite": {
+   "index": "data/PHerc0172/scroll_lite.json",
+   "bin": "data/PHerc0172/scroll_lite.bin",
+   "binPacked": "data/PHerc0172/scroll_lite.i16p.gz",
+   "sizeHint": 3167004,
+   "packedSizeHint": 1513032,
+   "source": "the same meshes at half the sampling (tools/build.py --coarsen 2), for phones"
+  }
  },
  "windings": [
   "w052",
@@ -99,4 +107,4 @@
   "notes": "Meshes, X-ray and ink images come only from the open data bucket vesuvius-challenge-open-data (s3://vesuvius-challenge-open-data/PHerc0172/), licensed CC BY-NC 4.0: attribution, non-commercial use. This page shows images only: no transcriptions or readings of the text."
  },
  "notes": "Segment ids w001 and up are ours, ordered by median radius (innermost first); scroll.json keeps each source segment."
-}
+}

tools/build.py

@@ -8,6 +8,12 @@ Outputs:
   scroll.json  manifest: per-winding grid sizes, byte offsets, physical sizes, atlas rects, sources
   atlas_ink.jpg, atlas_ct.jpg   every winding packed at one physical scale (grayscale)
   hi/wNNN.jpg  per-winding Vesuvius Challenge ink preview for the close-up view
+
+Coarseness: UNROLL_STEP sets the grid step of a full build (default 3). A lighter copy of a built mesh, for phones
+and low-power devices, needs no raw downloads:
+  python tools/build.py --coarsen 2 data/PHerc0172     writes scroll_lite.bin, scroll_lite.json, scroll_lite.i16p.gz
+It keeps every 2nd sampled row and column (plus the last ones), so the UV mapping (rowIdx, colIdx over the same
+gridH, gridW), the atlases, the ink layers and the flat layout are unchanged.
 """
 import glob
 import http.client
@@ -35,7 +41,7 @@ CELL_MM = 20 * VOX_MM      # tifxyz scale 0.05: one grid cell is 20 voxels
 CT_RES = os.environ.get("UNROLL_CT_RES", "9.362um")          # surface volume for the X-ray layer (any scan: it is a UV texture)
 NO_INK = os.environ.get("UNROLL_NO_INK") == "1"
 RENUMBER = os.environ.get("UNROLL_RENUMBER") == "1"          # name the windings w001.. by radius, innermost first
-STEP = 3                   # grid decimation for the browser mesh
+STEP = int(os.environ.get("UNROLL_STEP", "3"))   # grid decimation for the browser mesh (larger is coarser)
 PPMM = float(os.environ.get("UNROLL_PPMM", "7.5"))   # atlas pixels per mm (lowered for long scrolls)
 ATLAS = 4096
 PAD = 6
@@ -281,11 +287,41 @@ def main():
         "totalWidthMM": round(sum(wi["widthMM"] for wi in wins), 1),
         "totalAreaCM2": round(sum(wi["areaCM2"] for wi in wins), 1),
         "vertices": int(offset // 6),
+        "step": STEP,
     }
     json.dump(manifest, open(f"{OUT}/scroll.json", "w"), separators=(",", ":"))
     print("vertices", manifest["vertices"], "bin MB", offset / 1e6, "strip m", manifest["totalWidthMM"] / 1000,
           "area cm2", manifest["totalAreaCM2"])
 
 
+def coarsen(folder, k, name="scroll_lite"):
+    """Keep every k-th sampled row and column of each winding (always the first and last) of a built mesh."""
+    sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+    from pack_bin import pack
+    man = json.load(open(f"{folder}/scroll.json"))
+    raw = np.fromfile(f"{folder}/scroll.bin", "<i2")
+    blobs, offset, wins = [], 0, []
+    for w in man["windings"]:
+        R, C = w["rows"], w["cols"]
+        a = raw[w["offset"] // 2:(w["offset"] + w["bytes"]) // 2].reshape(R, C, 3)
+        ri = sorted(set(range(0, R, k)) | {R - 1})
+        ci = sorted(set(range(0, C, k)) | {C - 1})
+        b = np.ascontiguousarray(a[np.ix_(ri, ci)]).astype("<i2").tobytes()
+        blobs.append(b)
+        wins.append({**w, "rows": len(ri), "cols": len(ci), "rowIdx": [w["rowIdx"][i] for i in ri],
+                     "colIdx": [w["colIdx"][i] for i in ci], "offset": offset, "bytes": len(b)})
+        offset += len(b)
+    data = b"".join(blobs)
+    out = {**man, "windings": wins, "vertices": int(offset // 6), "step": man.get("step", 3) * k}
+    open(f"{folder}/{name}.bin", "wb").write(data)
+    open(f"{folder}/{name}.i16p.gz", "wb").write(pack(data))
+    json.dump(out, open(f"{folder}/{name}.json", "w"), separators=(",", ":"))
+    print("vertices", man["vertices"], "->", out["vertices"], "bin bytes", len(raw) * 2, "->", len(data),
+          "packed", os.path.getsize(f"{folder}/{name}.i16p.gz"))
+
+
 if __name__ == "__main__":
-    main()
+    if len(sys.argv) == 4 and sys.argv[1] == "--coarsen":
+        coarsen(sys.argv[3].rstrip("/"), int(sys.argv[2]))
+    else:
+        main()