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One click sends your selected objects (or the whole scene) to Light SDK as a .glb. Works with Unity 2021.3 and newer.
1

Add the glTFast package

In Unity: Window → Package Manager → + → Add package by name…, enter com.unity.cloud.gltfast, and add it.
2

Download the plugin

Grab LightExporter-Unity.zip from the LightSDK releases page and unzip it.
3

Add it to your project

Package Manager → + → Add package from disk…, then select LightExporter/package.json from the unzipped folder.
Use it: Light → Export to Light (⌘⌥L), or right-click a selection in the Hierarchy → Export to Light. If objects are selected, only the selection exports - otherwise the whole scene does. Light SDK opens automatically with your model.