RealityScan’s GLB export is limited by the glTF 2.0 container’s uint32 length fields (~4 GB max). For high-density photogrammetry it is easy to go past that, although the glb container is a nice-to-work-with file format. Eg 200M tris mesh is ~5–10 GB of geometry alone, forcing users to fallback to FBX/USD/ABC or split exports by parts.
Khronos released glTF 2.1 (June 2026) with a 64-bit GLB container that removes this ceiling while keeping the format otherwise unchanged. Since RS already writes GLB, this is a container-level change: write 64-bit chunk lengths when the asset exceeds 4 GiB (or behind an export checkbox), keeping 2.0 output for smaller assets.