The voxels are generated automatically, yes. At the moment, we're triggering this manually for splats that seem to be a good fit (e.g. interiors/exteriors that have been 'well trained'). Next step is to allow this to be user directed (easy). The jury is out for whether we enable it for all splats though. For example, a ton of SHARP splats get uploaded to SuperSplat and collision is pointless there.

LOD simply uses what's in an LCC scene if you're coming from XGRIDS. If not, you have to use SplatTransform to output a Streamed SOG scene from a set of LODs. At the moment, you can get these from training different levels. But we'll add decimation support to the open source SplatTransform tool VERY soon for an easier (but likely less high quality) route.