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====== FBX Importing ======

Importing FBX files in Unity with the correct scale, rotation, and axis is fraught.

===== Unit Scaling =====

FBX files seems to be in cm by default, but can support other units. Other unit scales are achieved in FBX by by setting ''GlobalSettings->Properties70->UnitScaleFactor'' property in the file. For example, a 1 meter cube in 'meters' should be stored in an fbx file like:
<code yaml>
GlobalSettings:
  Properties70:
    UnitScaleFactor = (100.0)   # The 'unit' is 100 * 1cm 
CubeObject:
  Lcl Scaling = (1,1,1)
</code>

This file will show up in Unity's importer as '1m (File)'.

==== Blender ====

In order to achieve the above scaling (scale of 1 on objects, UnitScaleFactor=100), in the export settings set one of the following for ''Transform->Apply Scaling'':
  * FBX Units Scale
  * FBX All

===== Rotation =====

In the FBX file format, global axis alignment is stored in the GlobalSettings:
  * UpAxis: 0,0,1 (+Z)
  * FrontAxis: 0,1,0 (+Y)
  * CoordAxis: -1,0,0 (-X)
  * OriginalUpAxis: ??? <sup>[//[[:wiki:tag:research-needed|research needed]]//]</sup>

Unity uses these properties to determine the coordinate system for the file. On import, the asset will be rotated to convert it from the file-coordinate system, to the Unity coordinate system. __As of 2020.1, when "Bake Axis Conversion" is checked, these rotations will be baked into the meshes, rather than applied in the transforms.__

==== Blender ====

++++ Instructions for Blender ~2.92 |
{{:blender_5lcugkdlz1.png}}
{{:unity_4iszlno6j5.png}}
++++
++++ Instructions for Blender ~2.83 |
In Blender 2.83, you **must** select "!Experimental! Apply Transforms" to export an object with the correct tranformations into Unity.
In Unity, "Bake Axis Conversion" must be **off**.
{{:blender_6pdtp5vutg.png}}
{{:unity_4iszlno6j5.png}}
++++

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