glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#ifndef ROAM_DEBUG
+ g_mutex_lock(&opengl->sphere_lock);
roam_sphere_update_errors(opengl->sphere);
roam_sphere_split_merge(opengl->sphere);
+ g_mutex_unlock(&opengl->sphere_lock);
#endif
#ifdef ROAM_DEBUG