Here is how to export FBX models to Unity with perfect transform rotation values if you're suing Blender. Works perfectly with rigged meshes too. More details is in the comments. : r/gamedev
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Blender to Unity Export - Correct Scale/Rotation — Immersive Limit
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Blender to Unity Export - Correct Scale/Rotation — Immersive Limit
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Blender to Unity Export - Correct Scale/Rotation — Immersive Limit
Blender to Unity Export - Correct Scale/Rotation — Immersive Limit
Fixing scale problems exporting .fbx files from Blender to Unity 5
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Blender 2.93 FBX export to Unity Scale is 100 : r/blender
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