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#unreaengine5

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In glTF 2.0 the `emissiveFactor` *must* be between 0 and 1, which isn't very useful since many emissive elements have much wider ranges than this, leading to the extension KHR_materials_emissive_strength which introduces a new property `emissiveStrength`.

It seems UE5 glTF respects a emissiveFactor > 1 so I'm allowing this in the Avoyd exporter.

I am not really sure why this is required to be 0-1 in the spec, nor why the extension didn't just permit a wider range