Custom UV Stream Names in assimp (#210) (#243)

* Custom UV Stream Names in assimp
https://jira.agscollab.com/browse/LYN-2506

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

@@ -32,7 +32,7 @@ namespace AZ
     {
         namespace FbxSceneBuilder
         {
-            const char* AssImpUvMapImporter::m_defaultNodeName = "UVMap";
+            const char* AssImpUvMapImporter::m_defaultNodeName = "UV";
 
             AssImpUvMapImporter::AssImpUvMapImporter()
             {
@@ -44,7 +44,7 @@ namespace AZ
                 SerializeContext* serializeContext = azrtti_cast<SerializeContext*>(context);
                 if (serializeContext)
                 {
-                    serializeContext->Class<AssImpUvMapImporter, SceneCore::LoadingComponent>()->Version(2); // LYN-2576
+                    serializeContext->Class<AssImpUvMapImporter, SceneCore::LoadingComponent>()->Version(3); // LYN-2506
                 }
             }
 
@@ -84,7 +84,13 @@ namespace AZ
                     AZStd::shared_ptr<SceneData::GraphData::MeshVertexUVData> uvMap =
                         AZStd::make_shared<AZ::SceneData::GraphData::MeshVertexUVData>();
                     uvMap->ReserveContainerSpace(vertexCount);
+
                     AZStd::string name(AZStd::string::format("%s%d", m_defaultNodeName, texCoordIndex));
+                    if (mesh->mTextureCoordsNames[texCoordIndex].length)
+                    {
+                        name = mesh->mTextureCoordsNames[texCoordIndex].C_Str();
+                    }
+
                     uvMap->SetCustomName(name.c_str());
 
                     for (int v = 0; v < mesh->mNumVertices; ++v)