PozzettiAndrea
4974530084
## GaussianAnalysis (viewer/Gaussian Analysis)
Header-only PLY inspector — instant even for hundreds-of-MB scenes.
Reports:
- splat count + file size + bytes/splat
- PLY encoding (ascii vs binary little/big endian)
- SH degree (derived from f_rest_* count: 0/9/24/45 -> 0/1/2/3)
- precision (float32 all / uint8 all / mixed)
- feature flags: has f_dc_*, has RGB uchar, has opacity, has scale_*,
has rot_*
- flavor heuristic: "raw 3DGS PLY (SH degree N)" / "SH-stripped"
/ "RGB-baked" / "compressed / packed"
OUTPUT_NODE: the report is also dumped into the node body via the `ui`
payload, while a STRING is returned so it can be chained into a Note
or printed downstream.
Sanity-tested against the bundled assets/apple.ply (200,000 splats,
47.30 MB, raw 3DGS SH=3, float32 all).
## GaussianExport (viewer/Gaussian Export)
PLY -> PLY (or PLY -> SPZ) reformatter. Three modes:
ply passthrough copy (just rename).
ply_no_sh strip f_rest_* (view-dependent SH coefficients). Keeps
the DC term (f_dc_0/1/2 = base color) so the splat still
looks right; loses specular highlights. ~3-5x smaller.
Pure Python via plyfile.
spz SPZ v2 (gzipped) via the vendored ply_to_spz.mjs (same
Node subprocess spz_route.py uses for the in-flight
viewer transcode). ~9x smaller; SH quantizes to 4 bits.
Requires Node on PATH.
Output is the absolute path to the produced file, so the node chains
into PreviewGaussians / GaussianMerge directly.
Typical use:
LoadPLY -> GaussianMerge(target=200k) -> GaussianExport(ply_no_sh)
-> PreviewGaussians
That gets you ~50 MB scenes from ~225 MB raw outputs without losing
view-independent appearance.
https://github.com/user-attachments/assets/4e21f1fd-9ba2-4ecc-b777-34f5dd9f7075
ComfyUI-GaussianPack
Tiny Gaussian-splat viewer for ComfyUI. One node, Preview Gaussians, with a
gsplat.js WebGL preview and camera-intrinsics widgets (FOV, image width, image height).
ply_path -- Preview Gaussians
GPL-3.0. Forked structurally from XuanYu-github/comfyui-PlyPreview.