From d2e2f8403ef1fd789a1e65aabb90b0d88568fb0f Mon Sep 17 00:00:00 2001
From: Masataka SUMI <santarh@gmail.com>
Date: Fri, 22 Oct 2021 20:31:28 +0900
Subject: [PATCH] =?UTF-8?q?VRM=200.x=20=E3=81=AE=E4=BB=95=E6=A7=98?=
 =?UTF-8?q?=E3=81=AB=E5=8F=8D=E3=81=99=E3=82=8B=E5=A4=89=E6=8F=9B=20Export?=
 =?UTF-8?q?=20=E3=81=AF=20throw=20=E3=81=99=E3=82=8B?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Assets/VRM/Runtime/IO/VRMExporter.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Assets/VRM/Runtime/IO/VRMExporter.cs b/Assets/VRM/Runtime/IO/VRMExporter.cs
index 2f7b4b6c9..91b1d80a3 100644
--- a/Assets/VRM/Runtime/IO/VRMExporter.cs
+++ b/Assets/VRM/Runtime/IO/VRMExporter.cs
@@ -10,6 +10,8 @@ namespace VRM
 {
     public class VRMExporter : gltfExporter
     {
+        public const Axes VrmSpecificationInverseAxis = Axes.Z;
+
         protected override IMaterialExporter CreateMaterialExporter()
         {
             return new VRMMaterialExporter();
@@ -30,6 +32,11 @@ namespace VRM
 
         public VRMExporter(glTF gltf, GltfExportSettings exportSettings) : base(gltf, exportSettings)
         {
+            if (exportSettings == null || exportSettings.InverseAxis != VrmSpecificationInverseAxis)
+            {
+                throw new Exception( $"VRM specification requires InverseAxis settings as {VrmSpecificationInverseAxis}");
+            }
+
             gltf.extensionsUsed.Add(glTF_VRM_extensions.ExtensionName);
         }