Revert "Add Root Node (#1028)" (#1029)

This reverts commit 80cfea5.

Author: pandaGaume

3ds Max/Max2Babylon/Exporter/BabylonExporter.Mesh.cs

@@ -1181,9 +1181,6 @@ int CreateGlobalVertex(IIGameMesh mesh, BabylonAbstractMesh babylonAbstractMesh,
                 float[] weight = new float[4] { 0, 0, 0, 0 };
                 int[] bone = new int[4] { 0, 0, 0, 0 };
                 var nbBones = skin.GetNumberOfBones(vertexIndex);
-                // Babylon, nor GLTF do not support single bone skeleton, we may add a root node  with no transform.
-                // this is echoing the process into BabylonExporter.Skeleton ExportBones(Skin)
-                var offset = nbBones == 1 ? 1 : 0;
 
                 int currentVtxBone = 0;
                 int currentSkinBone = 0;
@@ -1195,7 +1192,7 @@ int CreateGlobalVertex(IIGameMesh mesh, BabylonAbstractMesh babylonAbstractMesh,
                     if (boneWeight <= 0)
                         continue;
 
-                    bone[currentVtxBone] = boneIds.IndexOf(skin.GetIGameBone(vertexIndex, currentSkinBone).NodeID) + offset; // add optional offset
+                    bone[currentVtxBone] = boneIds.IndexOf(skin.GetIGameBone(vertexIndex, currentSkinBone).NodeID);
                     weight[currentVtxBone] = skin.GetWeight(vertexIndex, currentSkinBone);
                     ++currentVtxBone;
                 }

3ds Max/Max2Babylon/Exporter/BabylonExporter.Skeleton.cs

@@ -424,28 +424,6 @@ private BabylonBone[] ExportBones(IIGameSkin skin)
                 bones.Add(bone);
             }
 
-            // Babylon, nor GLTF do not support single bone skeleton, we may add a root node  with no transform.
-            if( bones.Count == 1)
-            {
-                var root  = new BabylonBone()
-                {
-                    id = Guid.NewGuid().ToString(),
-                    parentNodeId = null,
-                    name = "root-bone-added",
-                    index = 0,
-                    parentBoneIndex = -1,
-                    matrix = BabylonMatrix.Identity().m
-                };
-
-                var bone = bones[0];
-                bone.parentNodeId = root.id;
-                bone.index = 1;
-                bone.parentBoneIndex = 0;
-
-                bones.Insert(0, root);
-            }
-
-            // finally return the bones.
             return bones.ToArray();
         }
     }