Fixed build warnings on MSVC14 x64 in the 3DS format sources.

code/3DSConverter.cpp

@@ -690,7 +690,7 @@ void Discreet3DSImporter::AddNodeToGraph(aiScene* pcSOut,aiNode* pcOut,
     pcOut->mChildren = new aiNode*[pcIn->mChildren.size()];
 
     // Recursively process all children
-    const unsigned int size = pcIn->mChildren.size();
+    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
     for (unsigned int i = 0; i < size;++i)
     {
         pcOut->mChildren[i] = new aiNode();
@@ -742,7 +742,7 @@ void Discreet3DSImporter::GenerateNodeGraph(aiScene* pcOut)
         DefaultLogger::get()->warn("No hierarchy information has been found in the file. ");
 
         pcOut->mRootNode->mNumChildren = pcOut->mNumMeshes +
-            mScene->mCameras.size() + mScene->mLights.size();
+            static_cast<unsigned int>(mScene->mCameras.size() + mScene->mLights.size());
 
         pcOut->mRootNode->mChildren = new aiNode* [ pcOut->mRootNode->mNumChildren ];
         pcOut->mRootNode->mName.Set("<3DSDummyRoot>");

code/3DSExporter.cpp

@@ -87,7 +87,7 @@ namespace {
             const std::size_t chunk_size = head_pos - chunk_start_pos;
 
             writer.SetCurrentPos(chunk_start_pos + SIZE_OFFSET);
-            writer.PutU4(chunk_size);
+            writer.PutU4(static_cast<uint32_t>(chunk_size));
             writer.SetCurrentPos(head_pos);
         }