Integrating latest 47acbe8

Code/Tools/SceneAPI/FbxSceneBuilder/Importers/AssImpImporterUtilities.cpp

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+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+
+#include <SceneAPI/FbxSceneBuilder/Importers/AssImpImporterUtilities.h>
+
+#include <AzCore/Debug/Trace.h>
+#include <AzCore/StringFunc/StringFunc.h>
+
+#include <assimp/scene.h>
+
+namespace AZ
+{
+    namespace SceneAPI
+    {
+        namespace FbxSceneBuilder
+        {
+            bool IsSkinnedMesh(const aiNode& node, const aiScene& scene)
+            {
+                unsigned boneCount = 0;
+
+                for (unsigned mesh = 0; mesh < node.mNumMeshes; ++mesh)
+                {
+                    if (scene.mMeshes[node.mMeshes[mesh]]->HasBones())
+                    {
+                        ++boneCount;
+                    }
+                }
+
+                if (boneCount > 1 && boneCount != node.mNumMeshes)
+                {
+                    AZ_Error("AssImpImporterUtilities", false, "Node has %d meshes but only %d are skinned.  "
+                        "This is unexpected and may result in errors", node.mNumMeshes, boneCount);
+                }
+
+                return boneCount > 0;
+            }
+
+            bool IsPivotNode(const aiString& nodeName, size_t* pos)
+            {
+                AZStd::string_view name(nodeName.C_Str(), nodeName.length);
+
+                size_t myPos;
+
+                if (!pos)
+                {
+                    pos = &myPos;
+                }
+
+                *pos = AZ::StringFunc::Find(name, PivotNodeMarker);
+
+                return *pos != name.npos;
+            }
+
+            void SplitPivotNodeName(const aiString& nodeName, size_t pivotPos, AZStd::string_view& baseNodeName, AZStd::string_view& pivotType)
+            {
+                AZStd::string_view nodeNameView(nodeName.data, nodeName.length);
+                baseNodeName = AZStd::string_view(nodeNameView.substr(0, pivotPos));
+                pivotType = AZStd::string_view(nodeNameView.substr(pivotPos + sizeof PivotNodeMarker - 1));
+            }
+
+            aiMatrix4x4 GetConcatenatedLocalTransform(const aiNode* currentNode)
+            {
+                aiNode* parent = currentNode->mParent;
+                aiMatrix4x4 combinedTransform = currentNode->mTransformation;
+
+                while (parent)
+                {
+                    size_t pos;
+
+                    if (IsPivotNode(parent->mName, &pos))
+                    {
+                        combinedTransform = parent->mTransformation * combinedTransform;
+                        parent = parent->mParent;
+                    }
+                    else
+                    {
+                        break;
+                    }
+                }
+
+                return combinedTransform;
+            }
+        } // namespace FbxSceneBuilder
+    } // namespace SceneAPI
+} // namespace AZ