finally fixed rotation bug,

some performance,

QtMeshViewer/Source/GeometryEngine.cpp

@@ -10,8 +10,6 @@ GeometryEngine::GeometryEngine()
 	: m_indexBuf(QOpenGLBuffer::IndexBuffer)
 {
 	initializeOpenGLFunctions();
-
-	loadFile("..\\Release\\Msh\\cubeTex.msh");
 }
 
 GeometryEngine::~GeometryEngine()
@@ -63,9 +61,10 @@ void GeometryEngine::loadFile(const char* filePath)
 				new_info.modelMatrix = modelIterator->m4x4Translation;
 				new_info.modelMatrix.rotate(modelIterator->quadRotation);
 
-				// add offset to indices
-				for (auto& it : segmentIterator->indices)
-					it += vertexOffset;
+				// add offset to indices, no need to do it for the first one (maybe it's very big)
+				if(vertexOffset != 0)
+					for (auto& it : segmentIterator->indices)
+						it += vertexOffset;
 
 				// save data
 				vertexData += segmentIterator->vertices;