if(debug) printf("Render::render %d\n", __LINE__);
mwindow->sync_parameters(CHANGE_ALL);
if(debug) printf("Render::render %d\n", __LINE__);
if(debug) printf("Render::render %d\n", __LINE__);
mwindow->sync_parameters(CHANGE_ALL);
if(debug) printf("Render::render %d\n", __LINE__);