Hi guys, just two quick questions, probably easily solvable, just some things that annoy me while modeling. Firstly, i've noticed that when i use objects whose properties(length, width, height etc.) are fairly big or really big, some way into my modeling i notice that when i turn the view or zoom out far enough part of the object will disappear, almost like it's being cut off from my view. Secondly, also only happens after a while but sometimes also if a move my view in certain directions i can see what looks like inverted/black polygons all over the mesh which also becomes worse the more i zoom out. Is there something wrong with my display setting, my actual model, or what? Any help would be much appreciated. Pictures of both problems attached.