Adds 3DTILES_content_gltf extension

extensions/3DTILES_content_gltf/README.md

@@ -0,0 +1,50 @@
+# 3DTILES_content_gltf
+
+## Contributors
+
+* Sean Lilley, Cesium
+
+## Status
+
+Draft
+
+## Dependencies
+
+Written against the 3D Tiles 1.0 spec.
+
+## Contents
+
+  - [Overview](#overview)
+  - [Optional vs. Required](#optional-vs-required)
+  - [Schema Updates](#schema-updates)
+  - [Examples](#examples)
+
+## Overview
+
+This extension allows a tileset to use [glTF 2.0](https://github.com/KhronosGroup/glTF/tree/master/specification/2.0) and [GLB](https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#glb-file-format-specification) models directly as tile content.
+
+Using glTF directly simplifies runtime implementations and content pipelines that already support glTF but don't support 3D Tiles native formats. glTF models may be extended with instancing, feature metadata, and compression extensions to achieve near feature parity with the existing 3D Tiles formats:
+
+* [Batched 3D Model](../../specification/TileFormats/Batched3DModel/README.md)
+* [Instanced 3D Model](../../specification/TileFormats/Instanced3DModel/README.md)
+* [Point Cloud](../../specification/TileFormats/PointCloud/README.md)
+* [Composite](../../specification/TileFormats/Composite/README.md)
+
+Explicit file extensions are optional. Valid implementations may ignore it and identify a content's format by the magic field in its header (for `GLB`) or by parsing the JSON (for `glTF`). This extension allows tiles to reference glTF content but does not mandate that all tiles reference glTF content.
+
+## Optional vs. Required
+
+This extension is required, meaning it should be placed in the tileset JSON top-level `extensionsRequired` and `extensionsUsed` lists.
+
+## Schema Updates
+
+`3DTILES_content_gltf` is a property of the top-level `extensions` object and contains two optional properties:
+
+* `extensionsUsed`: an array of glTF extensions used by glTF content in the tileset.
+* `extensionsRequired`: an array of glTF extensions required by glTF content in the tileset.
+
+The full JSON schema can be found in [tileset.3DTILES_content_gltf.schema.json](schema/tileset.3DTILES_content_gltf.schema.json).
+
+## Examples
+
+A simple example can be found [here](examples/tileset).

extensions/3DTILES_content_gltf/examples/tileset/ll.gltf

@@ -0,0 +1,163 @@
+{
+  "accessors": [
+    {
+      "bufferView": 0,
+      "byteOffset": 0,
+      "componentType": 5126,
+      "count": 240,
+      "type": "VEC3",
+      "min": [
+        -69.262685040012,
+        -63.42564369086176,
+        -51.21932876482606
+      ],
+      "max": [
+        84.98775890329853,
+        61.14907375629991,
+        46.49423664715141
+      ]
+    },
+    {
+      "bufferView": 1,
+      "byteOffset": 0,
+      "componentType": 5126,
+      "count": 240,
+      "type": "VEC3",
+      "min": [
+        -0.9686407230533828,
+        -0.7415693003175017,
+        -0.7655772493024053
+      ],
+      "max": [
+        0.9686407230533828,
+        0.7415693003175017,
+        0.7655772493024053
+      ]
+    },
+    {
+      "bufferView": 2,
+      "byteOffset": 0,
+      "componentType": 5123,
+      "count": 360,
+      "type": "SCALAR",
+      "min": [
+        0
+      ],
+      "max": [
+        239
+      ]
+    }
+  ],
+  "asset": {
+    "generator": "3d-tiles-samples-generator",
+    "version": "2.0"
+  },
+  "buffers": [
+    {
+      "name": "buffer",
+      "byteLength": 6480,
+      "uri": "data:application/octet-stream;base64,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"
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteLength": 2880,
+      "byteOffset": 0,
+      "target": 34962,
+      "byteStride": 12
+    },
+    {
+      "buffer": 0,
+      "byteLength": 2880,
+      "byteOffset": 2880,
+      "target": 34962,
+      "byteStride": 12
+    },
+    {
+      "buffer": 0,
+      "byteLength": 720,
+      "byteOffset": 5760,
+      "target": 34963
+    }
+  ],
+  "materials": [
+    {
+      "pbrMetallicRoughness": {
+        "baseColorFactor": [
+          1,
+          1,
+          1,
+          1
+        ],
+        "roughnessFactor": 1,
+        "metallicFactor": 0
+      },
+      "alphaMode": "OPAQUE",
+      "doubleSided": false,
+      "emissiveFactor": [
+        0,
+        0,
+        0
+      ]
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "POSITION": 0,
+            "NORMAL": 1
+          },
+          "indices": 2,
+          "material": 0,
+          "mode": 4
+        }
+      ]
+    }
+  ],
+  "nodes": [
+    {
+      "name": "Z_UP_TO_Y_UP",
+      "matrix": [
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        -1,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1
+      ],
+      "children": [
+        1
+      ]
+    },
+    {
+      "name": "RTC_CENTER",
+      "translation": [
+        1214914.5525041146,
+        -4736388.031625768,
+        4081548.0407588882
+      ],
+      "mesh": 0
+    }
+  ],
+  "scene": 0,
+  "scenes": [
+    {
+      "nodes": [
+        0
+      ]
+    }
+  ]
+}