Remove aiCreateAndRegisterDefaultMaterial, it's completely wrong

code/Assimp.cpp

@@ -272,8 +272,6 @@ void aiReleaseImport( const aiScene* pScene)
 
     ASSIMP_BEGIN_EXCEPTION_REGION();
 
-    aiReleaseDefaultMaterial();
-
     // find the importer associated with this data
     const ScenePrivateData* priv = ScenePriv(pScene);
     if( !priv || !priv->mOrigImporter)  {

code/Importer.cpp

@@ -178,7 +178,6 @@ Importer::~Importer()
 {
     // Delete all import plugins
 	DeleteImporterInstanceList(pimpl->mImporter);
-    aiReleaseDefaultMaterial();
 
     // Delete all post-processing plug-ins
     for( unsigned int a = 0; a < pimpl->mPostProcessingSteps.size(); a++)
@@ -385,7 +384,6 @@ void Importer::FreeScene( )
 {
     ASSIMP_BEGIN_EXCEPTION_REGION();
 
-    aiReleaseDefaultMaterial();
     delete pimpl->mScene;
     pimpl->mScene = NULL;
 

code/MaterialSystem.cpp

@@ -387,26 +387,6 @@ aiReturn aiGetMaterialTexture(const C_STRUCT aiMaterial* mat,
     return AI_SUCCESS;
 }
 
-static aiMaterial *DefaultMaterial = nullptr;
-
-// ------------------------------------------------------------------------------------------------
-// Will return the default material.
-aiMaterial *aiCreateAndRegisterDefaultMaterial() {
-    if (nullptr == DefaultMaterial) {
-        DefaultMaterial = new aiMaterial;
-        aiString s;
-        s.Set(AI_DEFAULT_MATERIAL_NAME);
-        DefaultMaterial->AddProperty(&s, AI_MATKEY_NAME);
-    }
-
-    return DefaultMaterial;
-}
-
-// ------------------------------------------------------------------------------------------------
-// Will return the default material.
-void aiReleaseDefaultMaterial() {
-    DefaultMaterial = nullptr;
-}
 
 static const unsigned int DefaultNumAllocated = 5;
 

code/STLLoader.cpp

@@ -214,11 +214,10 @@ void STLImporter::InternReadFile( const std::string& pFile, aiScene* pScene, IOS
 
     // create a single default material, using a white diffuse color for consistency with
     // other geometric types (e.g., PLY).
-    aiMaterial* pcMat = aiCreateAndRegisterDefaultMaterial();
-    /*aiMaterial* pcMat = new aiMaterial();
+    aiMaterial* pcMat = new aiMaterial();
     aiString s;
     s.Set(AI_DEFAULT_MATERIAL_NAME);
-    pcMat->AddProperty(&s, AI_MATKEY_NAME);*/
+    pcMat->AddProperty(&s, AI_MATKEY_NAME);
 
     aiColor4D clrDiffuse(ai_real(1.0),ai_real(1.0),ai_real(1.0),ai_real(1.0));
     if (bMatClr) {