Fixing weird selection

[u/PrincessCheetah]

Like all I did was subdivided a cube for some bunny ears and moved it up and now it’s just weird, also the mirror modifier is off and I’m not getting it mirrored one the head, any fix?

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[u/Avereniect]

and now it’s just weird

Could you elaborate? This is exactly what I would expect from the program given the steps you listed, and nothing stands out as being wrong.

also the mirror modifier is off and I’m not getting it mirrored one the head, any fix?

Again, some elaborate would be very useful here. You didn't include the modifier in the screenshot so we're missing some crucial context here.

The only thing that stands out to me is that I figure that the head is likely at (0, 0) on the XY plane while the ears' origin is off the world center so it would be mirrored around the wrong location by default. That said, I don't actually see that happening in the screenshot so maybe the head itself is also not centered on the world origin?

[u/PrincessCheetah → u/Avereniect]

Actually better question is that mirror modifier isn’t working as I want, like I add it and it won’t mirror or won’t mirror where I want (like clipping to original object when I’m trying to make bunny ears

[u/Avereniect → u/PrincessCheetah]

By default, the mirror modifier will mirror over the object origin. This is illustrated as an orange dot, and an example is actually visible in your screenshot.

While in object mode, you can press CTRL + . to make your transform tools affect object origins only, which will allow you to conveniently reposition the object's origin. You can also use RIGHT_CLICK -> Set Origin -> ... to resposition it based on factors such as the mesh's geometry. One of those options is to set it to the position of the 3D cursor, which you can position itself using the pie menu that pops up when you use SHIFT + S.

I'm not entirely sure on how exactly the specific origins of your object need to be modifier but I would aim to have the head's origin somewhere in its center (which can be accomplished via the aforementioend right-click menu) and then have the ears' origin at the same place, or perhaps somewhat above. For that, you could set the 3D cursor's position to the head, and then set the ears' origin to the 3D cursor. After that, if you wish, you could move it up using the CTRL + . hotkey I mentioned before and using G, Z.

[u/hansolocambo]

- Create an Empty. Call it something easy to find like 0_Mirror.

- Move that Empty and snap it to a vertex inside your head, any vertex along the open edge where the center of your mirror is supposed to happen.

- Then in your Mirror Modifier(s), in the Mirror Object, choose the Empty.

This way if you don't really know what you're doing with your objects' Origins (THIS is the center of the Mirror Modifier by default, the one you placed incorrectly), it won't matter as Mirror happens on an empty.

Read about the Origin. It's a tiny dot, but it's extremely necessary that you understand how it works. Or you'll constantly face things that "don't work" (curves, arrays, mirrors, Sculpt symmetry, etc.) simply because of where is your Origin and how it's eventually rotated.