Help please..mirror modifier affecting unselected objects within a scene

[Baz]

Apologies in advance if the images are unclear but I will do my best to discuss the problem I am experiencing. I have all of the assets turned on in my scene because I was unable to see any discernable change with the mirror modifier added to the highlighted object in question.

Essentially, I am just trying to work on and add a new object to my low-poly dinosaur scene. However, the mirror modifier only seems to affect the landscape objects and completely disregards the object I intended to mirror. I have the intended object selected, so I’m wondering if I’ve done something wrong in my workspace or if there is something I neglected to do to my scene/objects in order to continue working with mirror modifier smoothly.

When I close this project file and open a new one, I can use mirror modifier just fine. I’m kinda confused!

[FedPete]

I’m not sure why you want to mirror a random landscape.

But Blender is a complex piece of software.
And as a student, people try to experiment a lot.
Without knowing what exactly is happening.
Blender gets confused by these (for Blender’s) unlogical actions.

What helps is a restart of Blender.
Or opening a new .blend file and FILE > APPEND object from the old file.
In this way, Blenders internals are reset.

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What we mis in your screen dumps is the “Outliner-panel”.
Also you are mirroring over two axes x-,y-ax

[Baz]

Hi,

I selected x and y axis to demonstrate the strange issue that was affecting the landscape object a little bit better, but I intended to only work in the x-axis. What I meant to say is that I have a separate object in the scene (second pic, highlighted in orange) that I wish to mirror but mirror modifier disregards the object and affects only the landscape.

[Baz]

Here is a full view of my workspace, if this helps. I’ve hidden everything except the object I want to mirror, which is supposed to be a streaking meteorite that I wanted to place in the background

[NP5]

Check the object has had its rotation/scale applied.
Half an icosphere is going to be a little awkward to split in half down a centre line, but doubtless can be worked around.
Frown what we can tell from a random non front on or side on view, the origin point looks OK central.

Add the modifier, show us what happens and what is in the modifier.

@Baz

When I close this project file and open a new one, I can use mirror modifier just fine. I’m kinda confused!

This, just rarely, happens. Sometimes it all magically works after a computer shutdown and restart. Alternatively, opening a new file, and appending into it all the models solves the unfathomable glitch.

[Baz]

Rotation/scale should be fine but I applied them anyways. I went ahead and added the mirror modifier and went into edit mode, but no result. I can’t even do this with a simple cube in the same project file, it’s really strange and if it’s a glitch this is the first time I’ve ran into it as a beginner using Blender.

[NP5]

Sounding very like a glitch. Try the suggested ways round it.

[FedPete]

First, do have multiple panels open!

• Outliner
• and Properties.
  You have such a big screen. You can easily have multiple panels open and give more information about what’s happening.

I can see you’re showing the halve meteor (the last image in the chat), but your modifier info shows you are working on the modifier for the LANDSCAPE modifier!

• Did you edit the objects at the same time?
• Are these mesh data (meteor, landscape) in the same object? (in one object you can have multiple meshes)
• Are you working with EMPTIES? And are you mirroring on the correct EMPTY? If the object origin is at 0,0,0 but the empty to mirror on is outside the view (for example 1000,1000,1000). Then the mirrored cope is at 2000,2000,2000 never to be seen due to the viewport clipping.

[NP5]

Good catch, the lack of the Outliner I missed that.

I wonder if he added the mesh for the meteor while still in Edit mode of the landscape?

@Baz