when i press the mirror modifer nothing happens to my shape im a noob at blender so could someone please help? i've tried all other solutions that related to my post but none of them worked. enter image description here

  • $\begingroup$ You'll notice you have no mirror object. Try playing around with that. In fact, try watching this video: youtube.com/watch?v=3LwQO_tWTAQ or this video: youtube.com/watch?v=y7ArlYDNi-A which is simpler. $\endgroup$ – user1833028 Nov 25 '15 at 16:24
  • $\begingroup$ @user1833028 You don't always need a mirror object. $\endgroup$ – user1853 Nov 25 '15 at 16:26
  • $\begingroup$ Oh sorry. Sometimes I'm romantic about experimentation :P $\endgroup$ – user1833028 Nov 25 '15 at 16:26
  • $\begingroup$ You're trying to mirror on the wrong axis. You're object is cut around the Y, not X axis. $\endgroup$ – TLousky Nov 25 '15 at 16:28
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    $\begingroup$ related: blender.stackexchange.com/questions/10882/… $\endgroup$ – user1853 Nov 25 '15 at 16:38

The axis of symmetry used by the mirror modifier is the object's origin (orange dot). enter image description here

If your object has the origin at the center of the object the mirror modifier's effect will not be visible.

Go into edit mode, displace the geometry on the desired axis to one side of the origin, and the mirror modifier's effect will be noticeable.

Pay attention also to the which axis the modifier is acting on.

enter image description here

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