how to use the World API https://docs.worldlabs.ai/api glTF™ 2.0 Specification https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html Khronos Announces glTF Gaussian Splatting Extension https://www.khronos.org/news/press/gltf-gaussian-splatting-press-release Build Gaussian Splat Experiences with SuperSplat Studio https://blog.playcanvas.com/build-gaussian-splat-experiences-with-supersplat-studio/ SuperSplat https://superspl.at/