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Instructions are in the link above. (That page is also a *much* better summary of the scope of this build than the video is. I suck at videos...)
About
Open Brush is a community-led evolution of Google's Tilt Brush. I'm working on improving the import and export workflow. We've already shipped a new GLTF importer based on GLTFast and we've got a preliminary implementation for a replacement GLTF exporter. In tandem we've started on a brand new Unity SDK to replace the venerable Tilt Brush / Open Brush Toolkit. Additionally we want to make a dent in initial integration with other key toolks - Blender, Godot, Unreal and any other popular 3d tool or platform.