@spatialpack/sdk

TypeScript SDK for SpatialPack. Wraps the @spatialpack/core pipeline so Node.js integrators can:

• analyze / optimize / conform glTF / GLB assets
• de-duplicate embedded textures across a batch (SPEC-0091)
• bundle a GLB + sidecars into a single .glb.zip archive
• round-trip USDA text ↔ USDC binary (SPEC-0076)
• compose USD layer stacks (SPEC-USD-Comp.1)
• score visual-diff metrics against cohort-aware thresholds (SPEC-0090)
• compute asset embeddings + k-NN similarity + recipe inheritance (SPEC-0087)
• drive recipe search with progress callbacks (SPEC-0013 / 0044 / 0072 / 0092)
• ingest Gaussian splats from Polycam / Luma / Niantic
• short-circuit visual-diff with multi-view phash signatures (SPEC-0062)

Requirements

• Node.js >= 20
• ESM-only ("type": "module"). Use dynamic import('@spatialpack/sdk') from CommonJS, or run your project with "type": "module" and .mjs / TypeScript-with-ESM.

Install

pnpm add @spatialpack/sdk
# or
npm install @spatialpack/sdk
# or
yarn add @spatialpack/sdk

The SDK transparently depends on @spatialpack/core (installed automatically). client.visualDiff(...) additionally requires the optional @spatialpack/cli binary on PATH (or pass a custom cliPath) — install it with pnpm add -D @spatialpack/cli if you need it.

Quick start (recommended: SpatialPackClient)

import { SpatialPackClient } from '@spatialpack/sdk';

const client = new SpatialPackClient({ defaultPreset: 'web-mobile' });

// analyze
const report = await client.analyze('hero.glb');

// optimize with real-time progress (SPEC-0092)
const opt = await client.optimize('hero.glb', {
  outPath: 'out.glb',
  onProgress: (e) => console.log(e.kind, e),
});

// conformance vs USDZ delivery rules
const conf = await client.conformance('hero.glb', { target: 'apple-ar' });

The previous v0.1.0 named exports (analyze, optimize, conformance, ...) remain fully supported. New code should prefer SpatialPackClient because it gives you a single place to set defaults (default preset, custom CLI path) without threading them through every call site.

SPEC-0091 — dedup-textures + .glb.zip bundle

const report = await client.dedupTextures(
  ['a.glb', 'b.glb', 'c.glb'],
  { outDir: 'out', minOccurrences: 2 },
);
console.log(`saved ${report.savedBytes} bytes (${(report.ratio * 100).toFixed(1)}% of original)`);

const bundle = client.bundleGlbZip({
  primaryPath: 'a.glb',
  sidecarPaths: ['out/textures/abc123.png'],
  outputPath: 'a.glb.zip',
});

const back = client.unbundleGlbZip({
  bundlePath: 'a.glb.zip',
  outDir: 'unpacked',
});

SPEC-0076 — USDA ↔ USDC round-trip + composition

// USDC → USDA (mirrors `usdcat` from the Pixar USD toolkit).
const usda = client.usdcFileToUsda('asset.usdc');

// USDA → USDC.
const usdc = client.usdaToUsdc(usda);

// Compose a stage from a root layer + sublayer search roots.
const stage = client.composeStageFromFile('root.usda', {
  layerRoots: ['layers/'],
});
console.log('layer stack (strongest first):', stage.layerStack);

SPEC-0087 — embeddings, k-NN, and recipe inheritance

import { AssetEmbeddingIndex } from '@spatialpack/sdk';

// 1. Embed one asset.
const emb = await client.embed('hero.glb');

// 2. Build an index across a directory tree.
const index = await client.buildEmbeddingIndex('corpus/', { recursive: true });
client.saveEmbeddingIndex(index, 'corpus/embedding-index.json');

// 3. Top-K nearest neighbors.
const similar = await client.findSimilar('hero.glb', index, {
  k: 5,
  excludeQueryFromResults: true,
});

// 4. Seed a recipe search from neighbors' cached winners.
const seeds = await client.seedRecipesFromNeighbors(
  'hero.glb',
  index,
  (id) => recipeCache.get(id) ?? null, // host-provided lookup
  { k: 5 },
);
console.log(`${seeds.cacheHits}/${seeds.k} neighbors had cached recipes`);

const search = await client.recipeSearch('hero.glb', {
  outPath: 'winner.glb',
  searchStrategy: 'multi-fidelity-tpe',
  seedRecipes: seeds.seedRecipes,
  maxRecipes: 12,
});

SPEC-0090 — safety-gate

import {
  buildAssetVerdict,
  gateAssetMetrics,
  summarizeAssetVerdicts,
} from '@spatialpack/sdk';

// Score your own visual-diff metric bundle against cohort thresholds:
const verdict = buildAssetVerdict({
  assetId: 'hero',
  cohortTags: { textureCohort: 'textured', animationCohort: 'static', polyCohort: 'medium' },
  metrics: { ssim: 0.98, deltaE94Mean: 0.7, edgeDelta: 0.02 },
});

// Or run the full CLI orchestrator (spawns nested `spatialpack` invocations):
const result = await client.safetyGate({
  featureId: 'spec-foo',
  cohort: 'static-props',
  reportDir: 'reports/spec-foo',
});
if (result.exitCode !== 0) throw new Error('safety-gate failed');

SPEC-0093 — visual-diff (CLI subprocess)

Visual-diff requires Playwright. The SDK doesn't import Playwright because @spatialpack/core MUST NOT depend on it (per the repo CLAUDE.md). Instead, the SDK spawns the spatialpack CLI binary and parses the JSON report:

const vd = await client.visualDiff({
  beforePath: 'before.glb',
  afterPath: 'after.glb',
  outDir: 'visual-diff-out',
  threshold: 0.05,
});
console.log(`exit ${vd.exitCode}`);

A JS-native renderer (headless three.js) is on the SPEC-0093 Phase 2 roadmap; until it lands, client.visualDiff(...) requires spatialpack on PATH (or pass cliPath).

SPEC-0062 — phash short-circuit for CI

const sig = client.phashSignature(views);            // views: [{ label, png }]
const baseline = parsePhashSignature(fs.readFileSync('phash-signature.json'));
const cmp = client.phashCompare(baseline, sig);
if (cmp.action === 'skip-diff') {
  // ~50ms triage replaces a 10-20s visual-diff (200-400× speedup).
  return { pass: true };
}

Splat ingest

const splat = client.parseSplat('polycam-export.ply');
const glb = client.wrapSplat(splat, { center: true, shOrder: 2 });
fs.writeFileSync('splat.glb', glb);

Type re-exports

The SDK re-exports every public type from @spatialpack/core so you don't need to import from two packages:

• AnalyzeReport, OptimizationReport, PresetId, OptimizeProgressEvent, OptimizeProgressCallback
• ConformanceReport, ConformanceTarget
• SplatInput, SplatWrapOptions, ParsePlyOptions
• FrameCostPrediction
• MultiViewPhashSignature, MultiViewPhashComparison
• SourceTextureDedupReport, GlbZipManifest, BundleInput, UnbundleResult
• ComposedStage
• SafetyGateReport, SafetyGateAssetMetrics, SafetyGateAssetVerdict, CohortTags, CohortConfig, SafetyGateFeatureToggle, SafetyGateFeatureConfig
• AssetEmbedding, EmbeddingSource, SimilarAsset, SimilarityResult, SeedRecipesFromNeighborsResult, InheritedRecipeNeighbor, RecipeLookup
• RecipeSearchReport, RunRecipeSearchOptions, RecipeCandidate, RecipeRunResult, RecipeWinnerStrategy

Examples

packages/sdk/examples/ ships runnable scripts:

• optimize-one.mjs — optimize a corpus GLB with progress events
• dedup-batch.mjs — dedup textures across the first 6 corpus assets
• usdc-to-usda.mjs — USDC ↔ USDA round-trip
• recipe-search-with-inheritance.mjs — k-NN seed feed
• glb-zip-roundtrip.mjs — bundle + unbundle

node packages/sdk/examples/optimize-one.mjs

API surface (at a glance)

SpatialPackClient

| Method | What it does | | --------------------------------- | ----------------------------------------------------------------------- | | analyze(input) | Full structured analyze report. | | optimize(input, opts) | Run the pipeline + return report + optimized GLB bytes (SPEC-0092). | | conformance(input, opts) | Web / Apple-AR conformance check (SPEC-0067). | | predictFrameCost(input) | SPEC-0068 frame-cost prediction. | | dedupTextures(paths, opts) | SPEC-0091 batch texture dedup. | | bundleGlbZip(input) | Bundle GLB + sidecars as .glb.zip. | | unbundleGlbZip(input) | Unbundle .glb.zip back to GLB + sidecars. | | usdcFileToUsda(path) | USDC → USDA (SPEC-0076 Phase G). | | usdaToUsdc(text) | USDA → USDC. | | composeStackFromFile(path, opt) | Compose a USD layer stack (SPEC-USD-Comp.1). | | embed(input, opts) | SPEC-0087 asset embedding. | | buildEmbeddingIndex(dir, opts) | Build a k-NN index across a directory. | | findSimilar(input, index, opts) | Top-K nearest neighbors. | | seedRecipesFromNeighbors(...) | Inherit recipe winners from neighbors. | | recipeSearch(input, opts) | SPEC-0072 recipe search with progress callbacks. | | safetyGate(opts) | SPEC-0090 orchestrator (spawns CLI subprocesses). | | visualDiff(opts) | SPEC-0093 visual-diff (requires @spatialpack/cli). | | phashSignature(views) | SPEC-0062 multi-view perceptual hash. | | phashCompare(baseline, sig) | Compare phash signatures for CI short-circuit. | | parseSplat(input, opts) | Parse Polycam / Luma / Niantic Gaussian-splat PLY. | | wrapSplat(input, opts) | Wrap a splat as glTF GLB. |

Standalone helpers

For pure-data work without instantiating a client:

• buildAssetVerdict, gateAssetMetrics, summarizeAssetVerdicts, expandCohort, validateFeatureToggle, renderSafetyGateMarkdown (SPEC-0090)
• serializePhashSignature, parsePhashSignature (SPEC-0062)
• AssetEmbeddingIndex class (SPEC-0087)
• normalizeInput, withNormalizedInput, toBytes (shared)
• SDK_VERSION (string)

See the source of packages/sdk/src/index.ts for the full re-export manifest.

Spec

The SDK shape is locked by SPEC-0095. The companion runtime SDK (@spatialpack/runtime, browser-side LOD + progressive + imposter) is SPEC-0081.

Versioning

SDK_VERSION is exported as a constant. The SDK and @spatialpack/core ship together; pin both to the same minor version.

See CHANGELOG.md for the version-by-version surface delta.

Contributing

The SDK lives in the SpatialPack monorepo at packages/sdk/. To work on it locally:

git clone https://github.com/montabano1/SpatialPack.git
cd SpatialPack
pnpm install
pnpm --filter @spatialpack/core build
pnpm --filter @spatialpack/sdk build
pnpm --filter @spatialpack/sdk test

Open an issue at https://github.com/montabano1/SpatialPack/issues before sending non-trivial PRs so we can keep the spec catalog authoritative.

License

MIT © Michael Montalbano.