diff --git a/packages/base/file-formats/file-shell-isolated.gts b/packages/base/file-formats/file-shell-isolated.gts
index 6ae2bf8a5d0..c7d6ca4306b 100644
--- a/packages/base/file-formats/file-shell-isolated.gts
+++ b/packages/base/file-formats/file-shell-isolated.gts
@@ -281,7 +281,7 @@ export class FileIsolatedShell extends GlimmerComponent<FileIsolatedShellSignatu
 
   get hasModel3d() {
     let m = this.args.model?.model3d;
-    return Boolean(m?.meshes || m?.triangles);
+    return Boolean(m?.meshes || m?.triangles || m?.vertices || m?.dimensions);
   }
 
   get hasFontMetadata() {
diff --git a/packages/base/file-formats/metadata-fields.gts b/packages/base/file-formats/metadata-fields.gts
index 3ae91558c3c..51eca3966dc 100644
--- a/packages/base/file-formats/metadata-fields.gts
+++ b/packages/base/file-formats/metadata-fields.gts
@@ -1185,9 +1185,20 @@ export class Model3dMetadataField extends FieldDef {
   // Triangle/facet count where the header carries it (a binary STL's facet
   // count, a slicer 3MF's summed configured face count); absent otherwise.
   @field triangles = contains(NumberField);
+  // Summed across a glTF's mesh-primitive POSITION accessors; other formats'
+  // headers carry no vertex count.
+  @field vertices = contains(NumberField);
   @field materials = contains(NumberField);
   @field materialNames = containsMany(StringField);
   @field unit = contains(StringField);
+  // Scene-graph facts a glTF header enumerates directly.
+  @field nodes = contains(NumberField);
+  @field animations = contains(NumberField);
+  @field textures = contains(NumberField);
+  // Model-space bounding box, "X × Y × Z", from a glTF's POSITION accessor
+  // min/max union. Unitless: glTF distances are nominally meters, but files
+  // routinely ignore that.
+  @field dimensions = contains(StringField);
   // Authoring/slicer application (3MF) or the binary STL header string.
   @field generator = contains(StringField);
   @field solidName = contains(StringField);
@@ -1219,9 +1230,25 @@ export class Model3dMetadataField extends FieldDef {
         {{#if @model.triangles}}
           <div class='row'><dt>Triangles</dt><dd>{{@model.triangles}}</dd></div>
         {{/if}}
+        {{#if @model.vertices}}
+          <div class='row'><dt>Vertices</dt><dd>{{@model.vertices}}</dd></div>
+        {{/if}}
+        {{#if @model.dimensions}}
+          <div class='row'><dt>Size</dt><dd>{{@model.dimensions}}</dd></div>
+        {{/if}}
         {{#if @model.unit}}
           <div class='row'><dt>Units</dt><dd>{{@model.unit}}</dd></div>
         {{/if}}
+        {{#if @model.nodes}}
+          <div class='row'><dt>Nodes</dt><dd>{{@model.nodes}}</dd></div>
+        {{/if}}
+        {{#if @model.animations}}
+          <div class='row'><dt>Animations</dt><dd
+            >{{@model.animations}}</dd></div>
+        {{/if}}
+        {{#if @model.textures}}
+          <div class='row'><dt>Textures</dt><dd>{{@model.textures}}</dd></div>
+        {{/if}}
         {{#if @model.materialNames.length}}
           <div class='row'><dt>Materials</dt><dd
             >{{this.materialList}}</dd></div>
diff --git a/packages/base/gltf-meta-extractor.ts b/packages/base/gltf-meta-extractor.ts
new file mode 100644
index 00000000000..2c1848bdd9c
--- /dev/null
+++ b/packages/base/gltf-meta-extractor.ts
@@ -0,0 +1,212 @@
+// Structure sniffer for the glTF family — both the JSON `.gltf` form and the
+// binary `.glb` container, which wraps the same glTF JSON in a length-prefixed
+// chunk. Unlike STL, a glTF describes itself: the JSON carries an accessor per
+// vertex attribute whose `count` is the vertex total and whose `min`/`max` are
+// the axis-aligned bounds, so the vertex/triangle counts and bounding box the
+// spec asks for come straight from the header rather than from a geometry scan.
+// The heavy buffers (a `.glb` BIN chunk, a `.gltf`'s external or base64 buffers)
+// are never touched. Pure JS (DataView/TextDecoder/JSON), kept in a plain `.ts`
+// module so it is directly unit-testable — mirroring `stl-meta-extractor.ts`.
+// Returns `undefined` for anything that isn't glTF; the calling FileDef turns
+// that into a `FileContentMismatchError` so the extractor falls back to the base
+// FileDef.
+
+export interface GltfMetadata {
+  // Which form the bytes took: the binary `.glb` container or raw `.gltf` JSON.
+  container: 'glb' | 'gltf';
+  // `asset.version` — "2.0" for every modern glTF.
+  gltfVersion?: string;
+  // `asset.generator` — the exporting tool, when it named itself.
+  generator?: string;
+  meshCount?: number;
+  materialCount?: number;
+  nodeCount?: number;
+  animationCount?: number;
+  textureCount?: number;
+  // Summed across every mesh primitive's POSITION accessor.
+  vertexCount?: number;
+  // Summed across primitives, honoring each one's topology mode.
+  triangleCount?: number;
+  // The model-space bounding box, "X × Y × Z", derived from the union of the
+  // POSITION accessors' min/max. glTF distances are nominally meters, but files
+  // routinely ignore that, so it is presented unitless.
+  dimensions?: string;
+}
+
+// 'glTF' and 'JSON' as little-endian uint32s — the GLB magic and its first
+// chunk's type tag.
+const GLB_MAGIC = 0x46546c67;
+const GLB_JSON_CHUNK = 0x4e4f534a;
+
+// glTF primitive topology modes. Only the triangle families contribute faces;
+// points and lines contribute none.
+const MODE_TRIANGLES = 4;
+const MODE_TRIANGLE_STRIP = 5;
+const MODE_TRIANGLE_FAN = 6;
+
+// Read the JSON chunk out of a GLB container without touching the BIN chunk that
+// follows it, so a large binary model is described from its header alone.
+function readGlbJson(buf: ArrayBuffer): unknown {
+  if (buf.byteLength < 20) {
+    return undefined;
+  }
+  let view = new DataView(buf);
+  // Only glTF 2.0 defines the chunked binary container read here.
+  if (view.getUint32(4, true) !== 2) {
+    return undefined;
+  }
+  let chunkLength = view.getUint32(12, true);
+  let chunkType = view.getUint32(16, true);
+  // The spec requires the JSON chunk to come first.
+  if (chunkType !== GLB_JSON_CHUNK || 20 + chunkLength > buf.byteLength) {
+    return undefined;
+  }
+  try {
+    return JSON.parse(
+      new TextDecoder().decode(new Uint8Array(buf, 20, chunkLength)),
+    );
+  } catch {
+    return undefined;
+  }
+}
+
+function decodeGltfJson(bytes: Uint8Array): unknown {
+  try {
+    return JSON.parse(new TextDecoder().decode(bytes));
+  } catch {
+    return undefined;
+  }
+}
+
+function round(n: number): number {
+  return Math.round(n * 100) / 100;
+}
+
+// Fold a mesh primitive's element count into a triangle total per its topology.
+function trianglesFor(mode: number, elementCount: number): number {
+  if (mode === MODE_TRIANGLES) {
+    return Math.floor(elementCount / 3);
+  }
+  if (mode === MODE_TRIANGLE_STRIP || mode === MODE_TRIANGLE_FAN) {
+    return Math.max(0, elementCount - 2);
+  }
+  return 0;
+}
+
+// Turn a parsed glTF document into the metadata we surface. Kept separate from
+// the container decoding so both forms share exactly one analysis.
+function analyzeGltf(
+  doc: any,
+  container: 'glb' | 'gltf',
+): GltfMetadata | undefined {
+  // Every glTF asset carries an `asset` object with a version; its absence is
+  // the cheapest reliable "this isn't glTF" signal.
+  if (!doc || typeof doc !== 'object' || !doc.asset) {
+    return undefined;
+  }
+  let accessors: any[] = Array.isArray(doc.accessors) ? doc.accessors : [];
+  let meshes: any[] = Array.isArray(doc.meshes) ? doc.meshes : [];
+
+  let vertexCount = 0;
+  let triangleCount = 0;
+  let min = [Infinity, Infinity, Infinity];
+  let max = [-Infinity, -Infinity, -Infinity];
+  let haveBounds = false;
+
+  for (let mesh of meshes) {
+    let primitives: any[] = Array.isArray(mesh?.primitives)
+      ? mesh.primitives
+      : [];
+    for (let primitive of primitives) {
+      let positionIndex = primitive?.attributes?.POSITION;
+      let position =
+        typeof positionIndex === 'number'
+          ? accessors[positionIndex]
+          : undefined;
+      let positionCount = Number(position?.count) || 0;
+      vertexCount += positionCount;
+
+      if (
+        Array.isArray(position?.min) &&
+        Array.isArray(position?.max) &&
+        position.min.length >= 3 &&
+        position.max.length >= 3
+      ) {
+        for (let axis = 0; axis < 3; axis++) {
+          min[axis] = Math.min(min[axis]!, Number(position.min[axis]));
+          max[axis] = Math.max(max[axis]!, Number(position.max[axis]));
+        }
+        haveBounds = true;
+      }
+
+      // Indexed geometry counts its index accessor; a non-indexed primitive
+      // draws its POSITION vertices directly.
+      let mode =
+        typeof primitive?.mode === 'number' ? primitive.mode : MODE_TRIANGLES;
+      let indexAccessor =
+        typeof primitive?.indices === 'number'
+          ? accessors[primitive.indices]
+          : undefined;
+      let elementCount = indexAccessor
+        ? Number(indexAccessor.count) || 0
+        : positionCount;
+      triangleCount += trianglesFor(mode, elementCount);
+    }
+  }
+
+  let metadata: GltfMetadata = { container };
+  let version = doc.asset?.version;
+  if (typeof version === 'string' && version) {
+    metadata.gltfVersion = version;
+  }
+  let generator = doc.asset?.generator;
+  if (typeof generator === 'string' && generator) {
+    metadata.generator = generator;
+  }
+  if (meshes.length) {
+    metadata.meshCount = meshes.length;
+  }
+  if (Array.isArray(doc.materials) && doc.materials.length) {
+    metadata.materialCount = doc.materials.length;
+  }
+  if (Array.isArray(doc.nodes) && doc.nodes.length) {
+    metadata.nodeCount = doc.nodes.length;
+  }
+  if (Array.isArray(doc.animations) && doc.animations.length) {
+    metadata.animationCount = doc.animations.length;
+  }
+  if (Array.isArray(doc.textures) && doc.textures.length) {
+    metadata.textureCount = doc.textures.length;
+  }
+  if (vertexCount > 0) {
+    metadata.vertexCount = vertexCount;
+  }
+  if (triangleCount > 0) {
+    metadata.triangleCount = triangleCount;
+  }
+  if (haveBounds) {
+    metadata.dimensions = `${round(max[0]! - min[0]!)} × ${round(
+      max[1]! - min[1]!,
+    )} × ${round(max[2]! - min[2]!)}`;
+  }
+  return metadata;
+}
+
+export function parseGltf(
+  buf: ArrayBuffer,
+): { gltfMetadata: GltfMetadata } | undefined {
+  let container: 'glb' | 'gltf';
+  let doc: unknown;
+  if (
+    buf.byteLength >= 12 &&
+    new DataView(buf).getUint32(0, true) === GLB_MAGIC
+  ) {
+    container = 'glb';
+    doc = readGlbJson(buf);
+  } else {
+    container = 'gltf';
+    doc = decodeGltfJson(new Uint8Array(buf));
+  }
+  let metadata = analyzeGltf(doc, container);
+  return metadata ? { gltfMetadata: metadata } : undefined;
+}
diff --git a/packages/base/gltf-model-def.gts b/packages/base/gltf-model-def.gts
new file mode 100644
index 00000000000..de648b67c0e
--- /dev/null
+++ b/packages/base/gltf-model-def.gts
@@ -0,0 +1,152 @@
+import File3dIcon from '@cardstack/boxel-icons/file-3d';
+import { byteStreamToUint8Array } from '@cardstack/runtime-common';
+import { DEFAULT_FILE_SIZE_LIMIT_BYTES } from '@cardstack/runtime-common/constants';
+import {
+  FileContentMismatchError,
+  type ByteStream,
+  type SerializedFile,
+} from './file-api';
+import {
+  ThreeDModelDef,
+  getExtension,
+  model3dAttributes,
+  type SerializedModel3d,
+} from './three-d-model-def';
+import { parseGltf, type GltfMetadata } from './gltf-meta-extractor';
+
+// Project the glTF header read onto the shared `model3d` field. A `.glb` is the
+// same glTF document in a binary wrapper, so both leaves share this mapping and
+// differ only in the container label. Unlike STL/3MF, a glTF header enumerates
+// its scene graph directly, so vertex/dimension facts sit cheaply in the JSON
+// chunk and are honest header-only answers.
+function gltfToModel3d(g: GltfMetadata): SerializedModel3d {
+  let containerLabel = g.container === 'glb' ? 'Binary glTF' : 'glTF JSON';
+  return {
+    format: g.gltfVersion
+      ? `${containerLabel} ${g.gltfVersion}`
+      : containerLabel,
+    meshes: g.meshCount,
+    triangles: g.triangleCount,
+    vertices: g.vertexCount,
+    materials: g.materialCount,
+    nodes: g.nodeCount,
+    animations: g.animationCount,
+    textures: g.textureCount,
+    dimensions: g.dimensions,
+    generator: g.generator,
+  };
+}
+
+// A shared extract step for both leaves: the container form is auto-detected by
+// `parseGltf`, so the only per-format difference is which extension is
+// accepted and how a parse failure is described.
+async function extractGltfAttributes(
+  expectedExtension: '.gltf' | '.glb',
+  containerLabel: string,
+  url: string,
+  getStream: () => Promise<ByteStream>,
+  options: {
+    contentHash?: string;
+    contentSize?: number;
+    fileSizeLimitBytes?: number;
+  },
+): Promise<SerializedFile<Partial<{ model3d: SerializedModel3d }>>> {
+  let extension = getExtension(url);
+  if (extension !== expectedExtension) {
+    throw new FileContentMismatchError(
+      `Expected ${expectedExtension} file extension, got "${extension || 'none'}"`,
+    );
+  }
+
+  let bytesPromise: Promise<Uint8Array> | undefined;
+  let memoizedStream = async () => {
+    bytesPromise ??= byteStreamToUint8Array(await getStream());
+    return bytesPromise;
+  };
+
+  let base = await ThreeDModelDef.extractAttributes(
+    url,
+    memoizedStream,
+    options,
+  );
+  let bytes = await memoizedStream();
+  // Over the size cap, skip the sniff but keep the model type — the file still
+  // renders via the live client-side viewer (which parses its own geometry);
+  // it just has an empty inspector panel and the cube placeholder. Do NOT
+  // throw FileContentMismatchError here: that would demote the file to a plain
+  // FileDef and lose the 3D card entirely.
+  let sizeCap = options.fileSizeLimitBytes ?? DEFAULT_FILE_SIZE_LIMIT_BYTES;
+  if (bytes.byteLength > sizeCap) {
+    console.warn(
+      `[GltfModelDef] skipping metadata extraction for ${url}: ${bytes.byteLength} bytes exceeds cap ${sizeCap}`,
+    );
+    return { ...base };
+  }
+  let parsed = parseGltf(
+    bytes.buffer.slice(
+      bytes.byteOffset,
+      bytes.byteOffset + bytes.byteLength,
+    ) as ArrayBuffer,
+  );
+  if (!parsed) {
+    throw new FileContentMismatchError(
+      `File does not contain a parseable ${containerLabel}`,
+    );
+  }
+  return { ...base, ...model3dAttributes(gltfToModel3d(parsed.gltfMetadata)) };
+}
+
+// The JSON form (`.gltf`). Its buffers and textures may be external or embedded
+// as base64; the header read here needs neither.
+export class GltfDef extends ThreeDModelDef {
+  static displayName = 'glTF Model';
+  static icon = File3dIcon;
+  static acceptTypes = '.gltf,model/gltf+json';
+
+  static async extractAttributes(
+    url: string,
+    getStream: () => Promise<ByteStream>,
+    options: {
+      contentHash?: string;
+      contentSize?: number;
+      fileSizeLimitBytes?: number;
+    } = {},
+  ): Promise<SerializedFile<Partial<{ model3d: SerializedModel3d }>>> {
+    return extractGltfAttributes(
+      '.gltf',
+      'glTF JSON document',
+      url,
+      getStream,
+      options,
+    );
+  }
+}
+
+// The binary form (`.glb`). The same glTF document wrapped in a chunked
+// container; `parseGltf` reads only its JSON chunk, never the geometry that
+// follows.
+export class GlbDef extends ThreeDModelDef {
+  static displayName = 'glTF Binary Model';
+  static icon = File3dIcon;
+  static acceptTypes = '.glb,model/gltf-binary';
+
+  static async extractAttributes(
+    url: string,
+    getStream: () => Promise<ByteStream>,
+    options: {
+      contentHash?: string;
+      contentSize?: number;
+      fileSizeLimitBytes?: number;
+    } = {},
+  ): Promise<SerializedFile<Partial<{ model3d: SerializedModel3d }>>> {
+    return extractGltfAttributes(
+      '.glb',
+      'GLB container',
+      url,
+      getStream,
+      options,
+    );
+  }
+}
+
+export default GltfDef;
diff --git a/packages/base/three-d-model-def.gts b/packages/base/three-d-model-def.gts
index 9231912ad93..6d3f71dc192 100644
--- a/packages/base/three-d-model-def.gts
+++ b/packages/base/three-d-model-def.gts
@@ -31,9 +31,14 @@ export interface SerializedModel3d {
   format?: string;
   meshes?: number;
   triangles?: number;
+  vertices?: number;
   materials?: number;
   materialNames?: string[];
   unit?: string;
+  nodes?: number;
+  animations?: number;
+  textures?: number;
+  dimensions?: string;
   generator?: string;
   solidName?: string;
   designer?: string;
diff --git a/packages/experiments-realm/model-samples/stl-complex.stl b/packages/experiments-realm/model-samples/stl-complex.stl
new file mode 100644
index 00000000000..f42fa805eb1
Binary files /dev/null and b/packages/experiments-realm/model-samples/stl-complex.stl differ
diff --git a/packages/experiments-realm/model-samples/stl-moderate.stl b/packages/experiments-realm/model-samples/stl-moderate.stl
new file mode 100644
index 00000000000..a7957d6380d
Binary files /dev/null and b/packages/experiments-realm/model-samples/stl-moderate.stl differ
diff --git a/packages/experiments-realm/model-samples/stl-simple.stl b/packages/experiments-realm/model-samples/stl-simple.stl
new file mode 100644
index 00000000000..d815c2bba7c
--- /dev/null
+++ b/packages/experiments-realm/model-samples/stl-simple.stl
@@ -0,0 +1,2018 @@
+solid DiskBase
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -2.506665e-002 1.984229e-001 -8.000000e-002
+         vertex 0.000000e+000 5.000000e-001 -8.000000e-002
+         vertex 2.506665e-002 1.984229e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 2.506665e-002 1.984229e-001 -8.000000e-002
+         vertex 0.000000e+000 5.000000e-001 -8.000000e-002
+         vertex 8.020564e-002 4.935251e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 2.506665e-002 1.984229e-001 -8.000000e-002
+         vertex 8.020564e-002 4.935251e-001 -8.000000e-002
+         vertex 7.362491e-002 1.859553e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -1.175570e-001 1.618034e-001 -8.000000e-002
+         vertex -2.323616e-001 4.427280e-001 -8.000000e-002
+         vertex -7.362491e-002 1.859553e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -7.362491e-002 1.859553e-001 -8.000000e-002
+         vertex -2.323616e-001 4.427280e-001 -8.000000e-002
+         vertex -1.583340e-001 4.742682e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -7.362491e-002 1.859553e-001 -8.000000e-002
+         vertex -1.583340e-001 4.742682e-001 -8.000000e-002
+         vertex -2.506665e-002 1.984229e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -2.506665e-002 1.984229e-001 -8.000000e-002
+         vertex -1.583340e-001 4.742682e-001 -8.000000e-002
+         vertex -8.020564e-002 4.935251e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -2.506665e-002 1.984229e-001 -8.000000e-002
+         vertex -8.020564e-002 4.935251e-001 -8.000000e-002
+         vertex 0.000000e+000 5.000000e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.688656e-001 -1.071654e-001 -8.000000e-002
+         vertex 3.873025e-001 -3.162227e-001 -8.000000e-002
+         vertex 1.369094e-001 -1.457937e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.369094e-001 -1.457937e-001 -8.000000e-002
+         vertex 3.873025e-001 -3.162227e-001 -8.000000e-002
+         vertex 3.315613e-001 -3.742554e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.369094e-001 -1.457937e-001 -8.000000e-002
+         vertex 3.315613e-001 -3.742554e-001 -8.000000e-002
+         vertex 9.635074e-002 -1.752613e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.996053e-001 -1.255810e-002 -8.000000e-002
+         vertex 4.898953e-001 -1.000128e-001 -8.000000e-002
+         vertex 1.902113e-001 -6.180340e-002 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.902113e-001 -6.180340e-002 -8.000000e-002
+         vertex 4.898953e-001 -1.000128e-001 -8.000000e-002
+         vertex 4.675081e-001 -1.773024e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.902113e-001 -6.180340e-002 -8.000000e-002
+         vertex 4.675081e-001 -1.773024e-001 -8.000000e-002
+         vertex 1.688656e-001 -1.071654e-001 -8.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
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+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -9.635074e-002 -1.752613e-001 -1.800000e-001
+         vertex -7.362491e-002 1.859553e-001 -1.800000e-001
+         vertex -4.973798e-002 -1.937166e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -4.973798e-002 -1.937166e-001 -1.800000e-001
+         vertex -7.362491e-002 1.859553e-001 -1.800000e-001
+         vertex -2.506665e-002 1.984229e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -4.973798e-002 -1.937166e-001 -1.800000e-001
+         vertex -2.506665e-002 1.984229e-001 -1.800000e-001
+         vertex 0.000000e+000 -2.000000e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex -2.506665e-002 1.984229e-001 -1.800000e-001
+         vertex 2.449294e-017 2.000000e-001 -1.800000e-001
+         vertex 0.000000e+000 -2.000000e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 0.000000e+000 -2.000000e-001 -1.800000e-001
+         vertex 2.449294e-017 2.000000e-001 -1.800000e-001
+         vertex 2.506665e-002 1.984229e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 0.000000e+000 -2.000000e-001 -1.800000e-001
+         vertex 2.506665e-002 1.984229e-001 -1.800000e-001
+         vertex 4.973798e-002 -1.937166e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 4.973798e-002 -1.937166e-001 -1.800000e-001
+         vertex 2.506665e-002 1.984229e-001 -1.800000e-001
+         vertex 7.362491e-002 1.859553e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 4.973798e-002 -1.937166e-001 -1.800000e-001
+         vertex 7.362491e-002 1.859553e-001 -1.800000e-001
+         vertex 9.635074e-002 -1.752613e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 9.635074e-002 -1.752613e-001 -1.800000e-001
+         vertex 7.362491e-002 1.859553e-001 -1.800000e-001
+         vertex 1.175570e-001 1.618034e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 9.635074e-002 -1.752613e-001 -1.800000e-001
+         vertex 1.175570e-001 1.618034e-001 -1.800000e-001
+         vertex 1.369094e-001 -1.457937e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.369094e-001 -1.457937e-001 -1.800000e-001
+         vertex 1.175570e-001 1.618034e-001 -1.800000e-001
+         vertex 1.541027e-001 1.274848e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.369094e-001 -1.457937e-001 -1.800000e-001
+         vertex 1.541027e-001 1.274848e-001 -1.800000e-001
+         vertex 1.688656e-001 -1.071654e-001 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.688656e-001 -1.071654e-001 -1.800000e-001
+         vertex 1.541027e-001 1.274848e-001 -1.800000e-001
+         vertex 1.809654e-001 8.515586e-002 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.688656e-001 -1.071654e-001 -1.800000e-001
+         vertex 1.809654e-001 8.515586e-002 -1.800000e-001
+         vertex 1.902113e-001 -6.180340e-002 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.902113e-001 -6.180340e-002 -1.800000e-001
+         vertex 1.809654e-001 8.515586e-002 -1.800000e-001
+         vertex 1.964574e-001 3.747626e-002 -1.800000e-001
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 -1.000000e+000
+      outer loop
+         vertex 1.902113e-001 -6.180340e-002 -1.800000e-001
+         vertex 1.964574e-001 3.747626e-002 -1.800000e-001
+         vertex 1.996053e-001 -1.255810e-002 -1.800000e-001
+      endloop
+   endfacet
+   facet normal -1.000000e+000 0.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.550000e-001 1.600000e-001 2.000000e-002
+         vertex 2.550000e-001 6.000000e-002 2.000000e-002
+         vertex 2.550000e-001 1.600000e-001 4.000000e-002
+      endloop
+   endfacet
+   facet normal -1.000000e+000 0.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.550000e-001 1.600000e-001 4.000000e-002
+         vertex 2.550000e-001 6.000000e-002 2.000000e-002
+         vertex 2.550000e-001 6.000000e-002 4.000000e-002
+      endloop
+   endfacet
+   facet normal 1.000000e+000 0.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.450000e-001 6.000000e-002 2.000000e-002
+         vertex 2.450000e-001 1.600000e-001 2.000000e-002
+         vertex 2.450000e-001 6.000000e-002 4.000000e-002
+      endloop
+   endfacet
+   facet normal 1.000000e+000 0.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.450000e-001 6.000000e-002 4.000000e-002
+         vertex 2.450000e-001 1.600000e-001 2.000000e-002
+         vertex 2.450000e-001 1.600000e-001 4.000000e-002
+      endloop
+   endfacet
+   facet normal -2.775558e-015 -1.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.450000e-001 1.600000e-001 2.000000e-002
+         vertex 2.550000e-001 1.600000e-001 2.000000e-002
+         vertex 2.450000e-001 1.600000e-001 4.000000e-002
+      endloop
+   endfacet
+   facet normal -2.775558e-015 -1.000000e+000 0.000000e+000
+      outer loop
+         vertex 2.450000e-001 1.600000e-001 4.000000e-002
+         vertex 2.550000e-001 1.600000e-001 2.000000e-002
+         vertex 2.550000e-001 1.600000e-001 4.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 1.000000e+000
+      outer loop
+         vertex 2.450000e-001 1.600000e-001 2.000000e-002
+         vertex 2.450000e-001 6.000000e-002 2.000000e-002
+         vertex 2.550000e-001 1.600000e-001 2.000000e-002
+      endloop
+   endfacet
+   facet normal 0.000000e+000 0.000000e+000 1.000000e+000
+      outer loop
+         vertex 2.550000e-001 1.600000e-001 2.000000e-002
+         vertex 2.450000e-001 6.000000e-002 2.000000e-002
+         vertex 2.550000e-001 6.000000e-002 2.000000e-002
+      endloop
+   endfacet
+endsolid
\ No newline at end of file
diff --git a/packages/experiments-realm/model-samples/three-mf-complex.3mf b/packages/experiments-realm/model-samples/three-mf-complex.3mf
new file mode 100644
index 00000000000..28a325bc028
Binary files /dev/null and b/packages/experiments-realm/model-samples/three-mf-complex.3mf differ
diff --git a/packages/experiments-realm/model-samples/three-mf-moderate.3mf b/packages/experiments-realm/model-samples/three-mf-moderate.3mf
new file mode 100644
index 00000000000..68cc5d4c4c2
Binary files /dev/null and b/packages/experiments-realm/model-samples/three-mf-moderate.3mf differ
diff --git a/packages/experiments-realm/model-samples/three-mf-simple.3mf b/packages/experiments-realm/model-samples/three-mf-simple.3mf
new file mode 100644
index 00000000000..6480fd1e459
Binary files /dev/null and b/packages/experiments-realm/model-samples/three-mf-simple.3mf differ
diff --git a/packages/host/tests/acceptance/model-file-extract-test.gts b/packages/host/tests/acceptance/model-file-extract-test.gts
index 728a2bdb14e..90428d36573 100644
--- a/packages/host/tests/acceptance/model-file-extract-test.gts
+++ b/packages/host/tests/acceptance/model-file-extract-test.gts
@@ -44,6 +44,28 @@ const CUBE_STL = [
   'endsolid testcube',
 ].join('\n');
 
+// A minimal glTF 2.0 document whose header enumerates every fact the extractor
+// projects: one triangulated mesh (24 vertices, 36 indices), bounds spanning
+// 2 x 4 x 6, and a named generator.
+const CUBE_GLTF = JSON.stringify({
+  asset: { version: '2.0', generator: 'Test Exporter 1.0' },
+  meshes: [
+    { primitives: [{ attributes: { POSITION: 0 }, indices: 1, mode: 4 }] },
+  ],
+  accessors: [
+    {
+      type: 'VEC3',
+      componentType: 5126,
+      count: 24,
+      min: [-1, -2, -3],
+      max: [1, 2, 3],
+    },
+    { type: 'SCALAR', componentType: 5123, count: 36 },
+  ],
+  materials: [{}, {}],
+  nodes: [{}, {}, {}],
+});
+
 const CUBE_MODEL_XML = `<?xml version="1.0" encoding="UTF-8"?>
 <model unit="millimeter" xmlns="http://schemas.microsoft.com/3dmanufacturing/core/2015/02">
   <metadata name="Title">Round-trip Cube</metadata>
@@ -89,10 +111,15 @@ module('Acceptance | model file-extract', function (hooks) {
       JSON.stringify(renderOptions),
     )}/file-extract`;
 
+  const MODULE_BY_DEF: Record<string, string> = {
+    StlDef: 'stl-model-def',
+    ThreeMfDef: 'three-mf-def',
+    GltfDef: 'gltf-model-def',
+    GlbDef: 'gltf-model-def',
+  };
+
   const baseFileDefCodeRef = (name: string): ResolvedCodeRef => ({
-    module: `${baseRealm.url}${
-      name === 'StlDef' ? 'stl-model-def' : 'three-mf-def'
-    }` as RealmResourceIdentifier,
+    module: `${baseRealm.url}${MODULE_BY_DEF[name]}` as RealmResourceIdentifier,
     name,
   });
 
@@ -134,6 +161,7 @@ module('Acceptance | model file-extract', function (hooks) {
           ...SYSTEM_CARD_FIXTURE_CONTENTS,
           'cube.stl': CUBE_STL,
           'cube.3mf': CUBE_3MF,
+          'cube.gltf': CUBE_GLTF,
           'notmodel.stl': 'this is not an STL file',
         },
       });
@@ -191,6 +219,33 @@ module('Acceptance | model file-extract', function (hooks) {
     );
   });
 
+  test('extracts glTF facts onto model3d through the render route', async function (assert) {
+    await visit(
+      renderPath(fileURL('cube.gltf'), {
+        fileExtract: true,
+        fileDefCodeRef: baseFileDefCodeRef('GltfDef'),
+      }),
+    );
+    let result = await captureFileExtractResult('ready');
+    let doc = result.searchDoc as Record<string, any>;
+    assert.strictEqual(result.status, 'ready');
+    // Container label folds in the asset version.
+    assert.strictEqual(doc?.model3d?.format, 'glTF JSON 2.0');
+    assert.strictEqual(doc?.model3d?.generator, 'Test Exporter 1.0');
+    // Unlike STL/3MF, a glTF header enumerates its scene graph directly, so
+    // geometry facts are honest header-only answers.
+    assert.strictEqual(doc?.model3d?.meshes, 1);
+    assert.strictEqual(doc?.model3d?.vertices, 24, 'POSITION accessor count');
+    assert.strictEqual(doc?.model3d?.triangles, 12, '36 indices / 3');
+    assert.strictEqual(doc?.model3d?.materials, 2);
+    assert.strictEqual(doc?.model3d?.nodes, 3);
+    assert.strictEqual(
+      doc?.model3d?.dimensions,
+      '2 \u00d7 4 \u00d7 6',
+      'max minus min per axis',
+    );
+  });
+
   test('a .stl whose bytes are not STL falls back and marks mismatch', async function (assert) {
     await visit(
       renderPath(fileURL('notmodel.stl'), {
diff --git a/packages/host/tests/unit/file-def-code-ref-test.ts b/packages/host/tests/unit/file-def-code-ref-test.ts
index ed58c17aec2..209d8af3b7d 100644
--- a/packages/host/tests/unit/file-def-code-ref-test.ts
+++ b/packages/host/tests/unit/file-def-code-ref-test.ts
@@ -73,6 +73,20 @@ module('Unit | isFileDefCodeRef', function (hooks) {
       ),
       'ThreeMfDef',
     );
+    assert.true(
+      isFileDefCodeRef(
+        { module: baseRRI('gltf-model-def'), name: 'GltfDef' },
+        virtualNetwork,
+      ),
+      'GltfDef',
+    );
+    assert.true(
+      isFileDefCodeRef(
+        { module: baseRRI('gltf-model-def'), name: 'GlbDef' },
+        virtualNetwork,
+      ),
+      'GlbDef',
+    );
     assert.true(
       isFileDefCodeRef(
         { module: baseRRI('pdf-file-def'), name: 'PdfDef' },
diff --git a/packages/host/tests/unit/model-meta-extractor-test.ts b/packages/host/tests/unit/model-meta-extractor-test.ts
index c4a8c78d6dc..e8479311fae 100644
--- a/packages/host/tests/unit/model-meta-extractor-test.ts
+++ b/packages/host/tests/unit/model-meta-extractor-test.ts
@@ -1,3 +1,4 @@
+import { parseGltf } from '@cardstack/base/gltf-meta-extractor';
 import { parseStl } from '@cardstack/base/stl-meta-extractor';
 import { parseThreeMf } from '@cardstack/base/three-mf-meta-extractor';
 import { zipSync, strToU8 } from 'fflate';
@@ -238,3 +239,124 @@ module('Unit | model metadata extractors | parseThreeMf', function () {
     );
   });
 });
+
+// A glTF document with one indexed triangle mesh: 24 vertices, a 36-index
+// (12-triangle) buffer, and a POSITION bounding box of 2 × 4 × 6.
+const SAMPLE_GLTF = {
+  asset: { version: '2.0', generator: 'Test Exporter 1.0' },
+  meshes: [
+    { primitives: [{ attributes: { POSITION: 0 }, indices: 1, mode: 4 }] },
+  ],
+  accessors: [
+    {
+      type: 'VEC3',
+      componentType: 5126,
+      count: 24,
+      min: [-1, -2, -3],
+      max: [1, 2, 3],
+    },
+    { type: 'SCALAR', componentType: 5123, count: 36 },
+  ],
+  materials: [{}, {}],
+  nodes: [{}, {}, {}],
+  animations: [{}],
+  textures: [{}],
+};
+
+function gltfJson(doc: object): ArrayBuffer {
+  return toArrayBuffer(new TextEncoder().encode(JSON.stringify(doc)));
+}
+
+// Wrap a glTF document in a binary GLB container: the 12-byte header followed by
+// a single JSON chunk (padded to a 4-byte boundary with spaces, per spec).
+function buildGlb(doc: object): ArrayBuffer {
+  let jsonBytes = new TextEncoder().encode(JSON.stringify(doc));
+  let pad = (4 - (jsonBytes.length % 4)) % 4;
+  let chunkLength = jsonBytes.length + pad;
+  let total = 12 + 8 + chunkLength;
+  let buf = new ArrayBuffer(total);
+  let view = new DataView(buf);
+  let bytes = new Uint8Array(buf);
+  view.setUint32(0, 0x46546c67, true); // 'glTF'
+  view.setUint32(4, 2, true); // version 2
+  view.setUint32(8, total, true); // total length
+  view.setUint32(12, chunkLength, true); // JSON chunk length
+  view.setUint32(16, 0x4e4f534a, true); // 'JSON'
+  bytes.set(jsonBytes, 20);
+  for (let i = 0; i < pad; i++) {
+    bytes[20 + jsonBytes.length + i] = 0x20; // space padding
+  }
+  return buf;
+}
+
+module('Unit | model metadata extractors | parseGltf', function () {
+  test('reads counts and bounds from a .gltf JSON document', function (assert) {
+    let parsed = parseGltf(gltfJson(SAMPLE_GLTF));
+    let g = parsed?.gltfMetadata;
+    assert.strictEqual(g?.container, 'gltf');
+    assert.strictEqual(g?.gltfVersion, '2.0');
+    assert.strictEqual(g?.generator, 'Test Exporter 1.0');
+    assert.strictEqual(g?.vertexCount, 24, 'POSITION accessor count');
+    assert.strictEqual(g?.triangleCount, 12, '36 indices / 3');
+    assert.strictEqual(g?.dimensions, '2 × 4 × 6', 'max minus min per axis');
+    assert.strictEqual(g?.meshCount, 1);
+    assert.strictEqual(g?.materialCount, 2);
+    assert.strictEqual(g?.nodeCount, 3);
+    assert.strictEqual(g?.animationCount, 1);
+    assert.strictEqual(g?.textureCount, 1);
+  });
+
+  test('reads the same facts from a .glb binary container', function (assert) {
+    let parsed = parseGltf(buildGlb(SAMPLE_GLTF));
+    let g = parsed?.gltfMetadata;
+    assert.strictEqual(g?.container, 'glb', 'detected the GLB magic');
+    assert.strictEqual(g?.vertexCount, 24);
+    assert.strictEqual(g?.triangleCount, 12);
+    assert.strictEqual(g?.dimensions, '2 × 4 × 6');
+  });
+
+  test('counts triangles from POSITION when a primitive is not indexed', function (assert) {
+    let parsed = parseGltf(
+      gltfJson({
+        asset: { version: '2.0' },
+        meshes: [{ primitives: [{ attributes: { POSITION: 0 }, mode: 4 }] }],
+        accessors: [{ type: 'VEC3', count: 9 }],
+      }),
+    );
+    assert.strictEqual(parsed?.gltfMetadata.vertexCount, 9);
+    assert.strictEqual(parsed?.gltfMetadata.triangleCount, 3, '9 vertices / 3');
+  });
+
+  test('honors triangle-strip topology', function (assert) {
+    let parsed = parseGltf(
+      gltfJson({
+        asset: { version: '2.0' },
+        meshes: [{ primitives: [{ attributes: { POSITION: 0 }, mode: 5 }] }],
+        accessors: [{ type: 'VEC3', count: 6 }],
+      }),
+    );
+    assert.strictEqual(
+      parsed?.gltfMetadata.triangleCount,
+      4,
+      'strip: count - 2',
+    );
+  });
+
+  test('returns undefined for non-glTF content', function (assert) {
+    assert.strictEqual(
+      parseGltf(toArrayBuffer(new TextEncoder().encode('not a model'))),
+      undefined,
+      'random text',
+    );
+    assert.strictEqual(
+      parseGltf(gltfJson({ hello: 'world' })),
+      undefined,
+      'JSON without an asset object',
+    );
+    assert.strictEqual(
+      parseGltf(new ArrayBuffer(0)),
+      undefined,
+      'empty buffer',
+    );
+  });
+});
diff --git a/packages/runtime-common/file-def-code-ref.ts b/packages/runtime-common/file-def-code-ref.ts
index 929ddf0ac11..1a8e6da61cf 100644
--- a/packages/runtime-common/file-def-code-ref.ts
+++ b/packages/runtime-common/file-def-code-ref.ts
@@ -55,10 +55,13 @@ const FILEDEF_CODE_REF_BY_EXTENSION: Record<string, ResolvedCodeRef> = {
   '.m4v': { module: baseModule('mp4-video-def'), name: 'Mp4Def' },
   '.mov': { module: baseModule('mov-video-def'), name: 'MovDef' },
   '.webm': { module: baseModule('webm-video-def'), name: 'WebmDef' },
-  // 3D model formats. STL is raw triangle geometry; 3MF is a zipped OPC package.
-  // Both extend ThreeDModelDef, which renders a live client-side WebGL viewer.
+  // 3D model formats. STL is raw triangle geometry; 3MF is a zipped OPC
+  // package; GLB/glTF are the binary and JSON forms of the same scene format.
+  // All extend ThreeDModelDef, which renders a live client-side WebGL viewer.
   '.stl': { module: baseModule('stl-model-def'), name: 'StlDef' },
   '.3mf': { module: baseModule('three-mf-def'), name: 'ThreeMfDef' },
+  '.glb': { module: baseModule('gltf-model-def'), name: 'GlbDef' },
+  '.gltf': { module: baseModule('gltf-model-def'), name: 'GltfDef' },
   '.zip': { module: baseModule('zip-file-def'), name: 'ZipDef' },
   '.woff2': { module: baseModule('woff2-font-def'), name: 'Woff2Def' },
   '.woff': { module: baseModule('woff-font-def'), name: 'WoffDef' },