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GeezerVison is showing github.com — FIX issues with FBX files exported by 3ds Max 2021 by susares · Pull Request #13 · Unity-Technologies/UnityCsReference

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@susares

@susares susares commented Jul 13, 2020

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3ds Max 2021 introduced an undocumented change when exporting physical materials to FBX.
Which leaves the MaterialDescription based import unable to decide if it is a physical or Arnold material.

Basicly 3ds Max 2021 writes out the Arnod Standard Surface material ClassId instead of the one for Physical Materials.
It also adds a new ORIGINAL_MTL property which hints to the physical material.
Sadly in that case instead of writing Arnold related properties. Physical Material properties are written making

FBXMaterialDescriptionPreprocessor assuming it is an Arnold Standard Surface Material unable to read out any specialized properties.

The following pull request works around this change.

Autodesk is currently investigating this issue but there is no info on if or when a fix will be released.

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@susares
FIX issues with FBX files exported by 3ds Max 2021
a09b52d
@susares

susares commented Jul 13, 2020

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I forgot to mention, that this will affect all Unity3D Versions currently released that support material description based FBX imports.
When then try to import 3ds Max 2021 exported FBX files.
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@aras-p

aras-p commented Jul 13, 2020

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We don't accept bug reports or pull requests via this repository. Please file a bug using official channels (Help -> Report a bug menu in Unity etc.)
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@unity-emilk
unity-emilk force-pushed the master branch from c84064b to 0a2eeb7 Compare April 14, 2022 17:58
@unity-emilk
unity-emilk force-pushed the master branch from 9778aae to b1c78d1 Compare May 8, 2024 16:38
@unity-emilk
unity-emilk force-pushed the master branch from ac359b9 to 59e16ee Compare October 31, 2024 15:31
@unity-emilk
unity-emilk force-pushed the master branch from 70fff5e to 10f8718 Compare May 29, 2025 16:37
@unity-emilk
unity-emilk force-pushed the master branch from 59b03b8 to b74c77b Compare June 16, 2026 19:37
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@susares @aras-p
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