Revert "store node mesh vs. meshes"

This reverts commit a0d97505e5a53a9aa3a734d6bd3ad790234e6e09.

code/glTF2Asset.h

@@ -781,7 +781,7 @@ namespace glTF2
     struct Node : public Object
     {
         std::vector< Ref<Node> > children;
-        Ref<Mesh> mesh;
+        std::vector< Ref<Mesh> > meshes;
 
         Nullable<mat4> matrix;
         Nullable<vec3> translation;

code/glTF2Asset.inl

@@ -934,9 +934,16 @@ inline void Node::Read(Value& obj, Asset& r)
     }
 
     if (Value* mesh = FindUInt(obj, "mesh")) {
+        //unsigned numMeshes = (unsigned)meshes->Size();
+        unsigned numMeshes = 1;
+
+        //std::vector<unsigned int> meshList;
+
+        this->meshes.reserve(numMeshes);
+
         Ref<Mesh> meshRef = r.meshes.Retrieve((*mesh).GetUint());
 
-        if (meshRef) this->mesh = meshRef;
+        if (meshRef) this->meshes.push_back(meshRef);
     }
 
     if (Value* camera = FindUInt(obj, "camera")) {

code/glTF2AssetWriter.inl

@@ -417,9 +417,7 @@ namespace glTF2 {
 
         AddRefsVector(obj, "children", n.children, w.mAl);
 
-        if (n.mesh) {
-            obj.AddMember("mesh", n.mesh->index, w.mAl);
-        }
+        AddRefsVector(obj, "meshes", n.meshes, w.mAl);
 
         AddRefsVector(obj, "skeletons", n.skeletons, w.mAl);
 

code/glTF2Exporter.cpp

@@ -476,15 +476,16 @@ void glTF2Exporter::ExportMaterials()
  */
 bool FindMeshNode(Ref<Node>& nodeIn, Ref<Node>& meshNode, std::string meshID)
 {
-
-    if (nodeIn->mesh && meshID.compare(nodeIn->mesh->id) == 0) {
-        meshNode = nodeIn;
-        return true;
+    for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) {
+        if (meshID.compare(nodeIn->meshes[i]->id) == 0) {
+          meshNode = nodeIn;
+          return true;
+        }
     }
 
     for (unsigned int i = 0; i < nodeIn->children.size(); ++i) {
         if(FindMeshNode(nodeIn->children[i], meshNode, meshID)) {
-            return true;
+          return true;
         }
     }
 
@@ -755,8 +756,8 @@ unsigned int glTF2Exporter::ExportNodeHierarchy(const aiNode* n)
         CopyValue(n->mTransformation, node->matrix.value);
     }
 
-    if (n->mNumMeshes > 0) {
-        node->mesh = mAsset->meshes.Get(n->mMeshes[0]);
+    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
+        node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i]));
     }
 
     for (unsigned int i = 0; i < n->mNumChildren; ++i) {
@@ -784,8 +785,8 @@ unsigned int glTF2Exporter::ExportNode(const aiNode* n, Ref<Node>& parent)
         CopyValue(n->mTransformation, node->matrix.value);
     }
 
-    if (n->mNumMeshes > 0) {
-        node->mesh = mAsset->meshes.Get(n->mMeshes[0]);
+    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
+        node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i]));
     }
 
     for (unsigned int i = 0; i < n->mNumChildren; ++i) {

code/glTF2Importer.cpp

@@ -517,24 +517,22 @@ aiNode* ImportNode(aiScene* pScene, glTF2::Asset& r, std::vector<unsigned int>&
         }
     }
 
-    if (node.mesh) {
-
-        int idx = node.mesh.GetIndex();
+    if (!node.meshes.empty()) {
+        int count = 0;
+        for (size_t i = 0; i < node.meshes.size(); ++i) {
+            int idx = node.meshes[i].GetIndex();
+            count += meshOffsets[idx + 1] - meshOffsets[idx];
+        }
+        ainode->mNumMeshes = count;
 
-        ai_assert(idx >= 0 && idx < meshOffsets.size());
+        ainode->mMeshes = new unsigned int[count];
 
-        unsigned int offBegin = meshOffsets[idx];
-        unsigned int offEnd = meshOffsets[idx + 1];
         int k = 0;
-        
-        ai_assert(offEnd >= offBegin);
-
-        ainode->mNumMeshes = offEnd - offBegin;
-        ainode->mMeshes = new unsigned int[ainode->mNumMeshes];
-
-        for (unsigned int j = offBegin; j < offEnd; ++j, ++k) {
-            ai_assert(k < ainode->mNumMeshes);
-            ainode->mMeshes[k] = j;
+        for (size_t i = 0; i < node.meshes.size(); ++i) {
+            int idx = node.meshes[i].GetIndex();
+            for (unsigned int j = meshOffsets[idx]; j < meshOffsets[idx + 1]; ++j, ++k) {
+                ainode->mMeshes[k] = j;
+            }
         }
     }