Warning: The imported mesh is very small. This is most likely an issue with the units used when exporting to FBX

Warning: The imported mesh is very small. This is most likely an issue with the units used when exporting to FBX.
how can i fix this

It is only a warning. If the mesh is importing too small for what you want, you have a few options:

  1. Make it bigger in the program that you export the mesh from.
  2. Use different units of measurement in that same program so they more closely match Unreal’s (1 Unreal Unit = 1 centimeter).
  3. When you import the mesh, the FBX import dialog has an option for scaling the import. Put a larger number in that field before completing the import.
  4. (not recommended) Just scale the mesh in Unreal wherever you need it bigger. This option is not recommended because you will have to do it in EVERY case where you want the mesh bigger. If it is imported already big you don’t have to bother yourself with it all the time. Also, lots of scaling can throw off other things you want to do within the game and introduce rounding errors if it’s extreme.

To add to mightyenigma’s:

  1. Make sure your DCC’s default unit is
    set to centimeters (1uu in UE4 =
    1cm).
  2. Reset your mesh transforms before
    exporting.
  3. Check you’re using the correct FBX
    version for the content you’re
    authoring.
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