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.
That’s a pretty significant limitation for high-density photogrammetry. GLB is convenient and widely supported, but hitting the ~4 GB container limit makes it impractical for very large scans. Being able to export larger GLBs, or having an automatic option to split the mesh into multiple GLB files, would be really useful. Hopefully RealityScan considers this for a future update.