genrecon/backend/optimize_glb.sh

#!/usr/bin/env bash
# Web-optimize a GenRecon scene.glb into a browser-loadable walkthrough asset:
# weld → simplify (meshoptimizer) → resize + webp textures. NO draco/meshopt geometry
# codec, so a plain three.js GLTFLoader loads it (no extra decoder in the viewer).
# BEST-EFFORT: every step falls back to the previous file, so this NEVER fails a job;
# worst case it copies the raw glb through. Uses a LOCAL gltf-transform install
# (a split @gltf-transform/core between separate globals dies with null.getLogger).
set -uo pipefail
IN="$1"; OUT="$2"
# Aggressive by default: the walkthrough runs on PHONES, where a multi-hundred-k
# triangle mesh + big textures exhausts mobile WebGL memory (blank scene). ~0.04
# vertex ratio ≈ a few hundred k triangles; 1024px textures. Tune up on desktop.
RATIO="${GENRECON_SIMPLIFY_RATIO:-0.04}"
TEXSZ="${GENRECON_TEX_SIZE:-1024}"
export NODE_OPTIONS="--max-old-space-size=${GENRECON_GLTF_HEAP_MB:-49152}"
GT="/opt/genrecon/gltftool/node_modules/.bin/gltf-transform"
[ -x "$GT" ] || GT="$(command -v gltf-transform || true)"
if [ -z "${GT:-}" ] || [ ! -e "$GT" ]; then echo "web-optimize: no gltf-transform, copying raw"; cp -f "$IN" "$OUT"; echo "OPTIMIZE_SKIPPED"; exit 0; fi
T=$(mktemp -d); cp -f "$IN" "$T/cur.glb"
try(){ local label="$1"; shift; if "$GT" "$@" 2>&1 | tail -1; then mv -f "$T/next.glb" "$T/cur.glb" 2>/dev/null && echo "  $label ok"; else echo "  $label skipped"; fi; }
try weld     weld     "$T/cur.glb" "$T/next.glb"
try simplify simplify "$T/cur.glb" "$T/next.glb" --ratio "$RATIO" --error 0.002
try resize   resize   "$T/cur.glb" "$T/next.glb" --width "$TEXSZ" --height "$TEXSZ"
try webp     webp     "$T/cur.glb" "$T/next.glb" --quality 82
cp -f "$T/cur.glb" "$OUT"; rm -rf "$T"
echo "OPTIMIZE_DONE $(du -h "$OUT" | cut -f1)"