Make pointers not to crash the loading

Author: pzgulyas

Source/3rdPartyLibs/glTFLoader/Build_Instructions.txt

@@ -1,8 +1,10 @@
 1. git clone the glTF schema repository to any directory: https://github.com/KhronosGroup/glTF
 2. Replace the glTF\specification\2.0\schema\extras.schema.json file with the one provided here by the OpenRails project.
-3. git clone the gltfLoader repository to the same base directory: https://github.com/KhronosGroup/glTF-CSharp-Loader
-4. Open the glTF-CSharp-Loader\CSharp.sln
-5. Bump the version of Newtonsoft.Json in the gltfLoader project to match with that one used in OpenRails (11.0.2 as of writing this).
-6. Build the Generator project.
-7. Build the gltfLoader project.
-8. Copy the resulting glTF-CSharp-Loader\glTFLoader\bin\Debug\netstandard1.3\glTFLoader.dll to this directory.
+3. Replace the glTF\specification\2.0\schema\animation.channel.target.schema.json file with the one provided here by the OpenRails project.
+4. Copy the glTF\extensions\2.0\Khronos\KHR_animation_pointer\schema\animation.channel.target.KHR_animation_pointer.schema.json file in to the glTF\specification\2.0\schema\ folder.
+5. git clone the gltfLoader repository to the same base directory: https://github.com/KhronosGroup/glTF-CSharp-Loader
+6. Open the glTF-CSharp-Loader\CSharp.sln
+7. Bump the version of Newtonsoft.Json in the gltfLoader project to match with that one used in OpenRails (11.0.2 as of writing this).
+8. Build the Generator project.
+9. Build the gltfLoader project.
+10. Copy the resulting glTF-CSharp-Loader\glTFLoader\bin\Debug\netstandard1.3\glTFLoader.dll to this directory.

Source/3rdPartyLibs/glTFLoader/animation.channel.target.schema.json

@@ -0,0 +1,40 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "animation.channel.target.schema.json",
+    "title": "Animation Channel Target",
+    "type": "object",
+    "description": "The descriptor of the animated property.",
+    "allOf": [ { "$ref": "glTFProperty.schema.json" } ],
+    "properties": {
+        "node": {
+            "allOf": [ { "$ref": "glTFid.schema.json" } ],
+            "description": "The index of the node to animate. When undefined, the animated object **MAY** be defined by an extension."
+        },
+        "path": {
+            "description": "The name of the node's TRS property to animate, or the `\"weights\"` of the Morph Targets it instantiates. For the `\"translation\"` property, the values that are provided by the sampler are the translation along the X, Y, and Z axes. For the `\"rotation\"` property, the values are a quaternion in the order (x, y, z, w), where w is the scalar. For the `\"scale\"` property, the values are the scaling factors along the X, Y, and Z axes.",
+            "anyOf": [
+                {
+                    "const": "pointer"
+                },
+                {
+                    "const": "translation"
+                },
+                {
+                    "const": "rotation"
+                },
+                {
+                    "const": "scale"
+                },
+                {
+                    "const": "weights"
+                },
+                {
+                    "type": "string"
+                }
+            ]
+        },
+        "extensions": { },
+        "extras": { }
+    },
+    "required": [ "path" ]
+}