sogpy 1.0.2

Convert Gaussian Splat PLY files to PlayCanvas SOG format

SogPy

Convert Gaussian Splat .ply files to PlayCanvas .sog format.

⚠️ Note: This is a direct Python conversion of splat-transform's PLY to SOG Node.js code. One-shotted with Claude Opus 4.5 — use with caution! Contributions are very welcome.

Installation

pip install sogpy

Usage

Command Line

# Basic conversion
sogpy input.ply output.sog

# With more clustering iterations (better quality, slower)
sogpy input.ply output.sog --iterations 20

Python API

from SogPython import convert_ply_to_sog

convert_ply_to_sog("input.ply", "output.sog")

What is SOG?

SOG (Splat Optimized Graphics) is PlayCanvas's format for Gaussian splat data. It uses:

• WebP lossless compression for textures
• K-means clustering to reduce color and scale data to 256 values
• Morton ordering for spatial coherence
• Smallest-three quaternion encoding for rotations

This typically achieves 5-6x compression compared to raw PLY files while preserving all data including spherical harmonics.

Features

• ✅ Full PLY format support (binary little-endian)
• ✅ Spherical harmonics (bands 1-3)
• ✅ WebP lossless compression
• ✅ 16-bit position precision with log transform
• ✅ Smallest-three quaternion compression

Requirements

• Python 3.8+
• numpy
• scipy
• Pillow

License

MIT