FBX import export - overscales camera focus distance by 1000 times #105088
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Reference: blender/blender-addons#105088
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Blender 4.0.2
Way to reproduce it:
In default blender scene leave only camera and set it's focus distance to 15m or download attached file - camera_export.blend
Export it with default settings with Blender FBX or use camera_blender_original.fbx
Import it to Houdini or Maya (in my case it's Houdini)
Focus distance end up being 1 500 000 units (translation is 0,0,1798.66, which is similar to what it was in Blender).
Houdini:
Maya:
@Mysteryem @mont29
FBX import export - overscales camera focus distance by 100to FBX import export - overscales camera focus distance by 1000 timesThe deprecated
SetSpecificDistance()andGetSpecificDistance()in the FBX 2010 SDK (FBX 6.1) documentation said the values to get and set would be in millimetres, as per the discussion in https://developer.blender.org/D6666, but I suspect that only applied to those deprecated functions and notFocusDistance.Get()andFocusDistance.Set()which seem to have been the replacement for the deprecated functions.The deprecated millimetre functions don't exist in the FBX 2011 SDK (FBX 7.1) and newer documentation.
Does it mean that it's safe to remove millimeter conversion now?
I think the millimetre conversion was probably always wrong.
I would guess that some time in the past (pre FBX 6.1), getting or setting FocusDistance with the FBX SDK was only done with
SetSpecificDistance()andGetSpecificDistance()which use/return millimetres, and that, at some point, the FBX SDK added theFocusDistanceproperty (presumably in metres), which can be accessed directly, and kept the old functions around for a while for compatibility.