some fixes

MshViewer/Source/OpenGlController.cpp

@@ -326,6 +326,8 @@ void OpenGLController::updateScene()
 	// tell sampler to use texture unit 0
 	glUniform1i(gluiSamplerID, 0);
 
+	if (vModels != NULL)
+	{
 		int instanceOffset(0);
 
 		for (unsigned int modelIndex = 0; modelIndex < vModels->size(); modelIndex++)
@@ -371,7 +373,7 @@ void OpenGLController::updateScene()
 				instanceOffset += vertexCount;
 			}
 		}
-
+	}
 	glfwSwapBuffers(pWindow);
 	glfwPollEvents();
 }

MshViewer/main.cpp

@@ -17,7 +17,9 @@ int main(int argc, char** argv)
 	else
 		scene = OpenGLController::getInstance();
 
+#ifdef _DEBUG
 	scene->loadMsh("..\\Release\\Msh\\quadPoly.msh");
+#endif // DEBUG
 
 	do {
 		scene->updateScene();