The weird thing is that when I look under it, it looks like how I intended it to look (I used the mirror modifier so idk what’s up with both sides):
If you didn’t figure out what’s the problem, the “imperfect” thing on the mesh (while in roblox) is that the middle part of it has a flat plane covering it. This doesn’t appear anywhere in the blender version of this mesh.
I’m new to 3D modelling in blender, so IDK how to fix it. Are there any solutions?
This is likely an issue with face orientation (which way the face is pointing towards). To be able to detect this issue in the future, you need to enable face orientation. You can find this in the top right of your screen.
This now means that the faces that you will see (that are pointed towards you) will be blue, and the ones that are inverted (meaning you can’t see them, and they disappear in studio or look weird) will be red.
On the rib cage and some of the pelvic bone on this skeleton, the face orientation is red, meaning if it is exported into studio, you will not be able to see it. To fix this, you need to select the red areas and press ctrl + n or ctrl shift n. Try both of them to see if that fixes it.
Another fix that this will be able to help you with is by telling you if you have any double faces. In this case, the colour will be darker and more visible. For example: