Adds EXT_geopose_basic_euler extension

extensions/2.0/Vendor/EXT_geopose_basic_euler/README.md

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+<!-- omit in toc -->
+# EXT_geopose_basic_euler
+
+<!-- omit in toc -->
+## Contributors
+
+* Sam Suhag, Cesium
+* Sean Lilley, Cesium
+* Peter Gagliardi, Cesium
+
+<!-- omit in toc -->
+## Status
+
+Draft
+
+<!-- omit in toc -->
+## Dependencies
+
+Written against the draft of [OGC GeoPose Standard 1.0](https://github.com/opengeospatial/GeoPose/tree/main/standard).
+
+<!-- omit in toc -->
+## Optional vs. Required
+
+This extension is optional, meaning it should be placed in the `extensionsUsed` list, but not in the `extensionsRequired` list.
+
+<!-- omit in toc -->
+## Contents
+- [Overview](#overview)
+  - [GeoPose 1.0 Standard](#geopose-10-standard)
+- [Coordinate Systems](#coordinate-systems)
+- [Schema Updates](#schema-updates)
+
+## Overview
+
+This extension to glTF enables static positioning and orienting of models on the Earth.
+
+### GeoPose 1.0 Standard
+
+GeoPose 1.0 is an OGC Implementation Standard for exchanging the location and orientation of real or virtual geometric objects (*Poses*) within reference frames anchored to the earth’s surface (*Geo*) or within other astronomical coordinate systems.
+
+This extension implements [Standardization Target 2: Basic-Euler](https://github.com/opengeospatial/GeoPose/blob/main/standard/standard/standard/clause_7_normative_text.adoc#standardization-target-2-basic-euler) in the OGC GeoPose 1.0 Standard.
+
+## Coordinate Systems
+
+This extension uses WGS84([EPSG:4979](https://epsg.io/4979)) as the coordinate reference system for specifying the position with longitude and latitude specified in degrees. Height above (or below) the ellipsoid must be specified in meters. The yaw-pitch-roll is provided as a rotation-only transform from a WGS84 referenced local tangent plane East-North-Up coordinate system..
+
+```json
+{
+  "extensions": {
+    "EXT_geopose_basic_euler": {
+      "longitude": 46.7,
+      "latitude": 25.067,
+      "height": 691.0,
+      "ypr": {
+        "yaw": 0.0,
+        "pitch": 0.0,
+        "roll": 0.0
+      }
+    }
+  }
+}
+```
+
+## Schema Updates
+
+Updates to the schema can be found in the [extension schema](schema/gltf.EXT_geopose_basic_euler.schema.json).

extensions/2.0/Vendor/EXT_geopose_basic_euler/schema/gltf.EXT_geopose_basic_euler.schema.json

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+{
+  "$schema": "http://json-schema.org/draft-04/schema",
+  "title": "EXT_geopose_basic_euler glTF extension",
+  "type": "object",
+  "description": "glTF extension for specifying the position and orientation of models on the Earth.",
+  "allOf": [
+    {
+      "$ref": "glTFProperty.schema.json"
+    }
+  ],
+  "properties": {
+    "longitude": {
+      "type": "number",
+      "description": "Longitude in the WGS84 datum. The angle must be specified in degrees.",
+      "minimum": -180.0,
+      "maximum": 180.0
+    },
+    "latitude": {
+      "type": "number",
+      "description": "Latitude in the WGS84 datum. The angle must be specified in degrees.",
+      "minimum": -90.0,
+      "maximum": 90.0
+    },
+    "height": {
+      "type": "number",
+      "description": "Heights are in meters above (or below) the WGS84 ellipsoid."
+    },
+    "ypr": {
+      "type": "object",
+      "description": "Rotation-only transformation from a WGS-84-referenced local tangent plane east-north-up coordinate system.",
+      "properties": {
+        "yaw": {
+          "type": "number",
+          "description": "Rotation about the LTP-ENU frame Z (up) axis. The angle must be specified in degrees."
+        },
+        "pitch": {
+          "type": "number",
+          "description": "Pitch is rotation about the y axis of the yaw-rotated local frame. The angle must be specified in degrees."
+        },
+        "roll": {
+          "type": "number",
+          "description": "Roll is rotation about the yaw and pitch rotated x axis of the local frame. The angle must be specified in degrees."
+        }
+      },
+      "required": [
+        "yaw",
+        "pitch",
+        "roll"
+      ]
+    },
+    "extensions": {},
+    "extras": {}
+  }
+}