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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:
<code yaml>
Name: P - String("UpAxis")  String("int")  String("Integer")  String("")  I32(2)  
Name: P - String("UpAxisSign")  String("int")  String("Integer")  String("")  I32(1)  
Name: P - String("FrontAxis")  String("int")  String("Integer")  String("")  I32(1)  
Name: P - String("FrontAxisSign")  String("int")  String("Integer")  String("")  I32(1)  
Name: P - String("CoordAxis")  String("int")  String("Integer")  String("")  I32(0)  
Name: P - String("CoordAxisSign")  String("int")  String("Integer")  String("")  I32(-1)  
Name: P - String("OriginalUpAxis")  String("int")  String("Integer")  String("")  I32(-1)  
Name: P - String("OriginalUpAxisSign")  String("int")  String("Integer")  String("")  I32(1)  
</code>

In the above case:
  * UpAxis: 0,0,1 (+Z)
  * FrontAxis: 0,1,0 (+Y)
  * CoordAxis: -1,0,0 (-X)
  * OriginalUpAxis: ??? <sup>[//[[:wiki:tag:research-needed|research needed]]//]</sup>

==== Blender ====

++++ Instructions for Blender ~2.83 |
{{:blender_5lcugkdlz1.png}}
{{:unity_4iszlno6j5.png}}
++++
++++ Instructions for Blender ~2.92 |
{{:blender_6pdtp5vutg.png}}
In Unity, "Bake Axis Conversion" must be **off**.
{{:unity_4iszlno6j5.png}}
++++

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