alspz
spz（Niantic 3D Gaussian Splat 压缩格式， MIT）的 Cython 绑定，供 ALTiler 3DGS 管线（T-063 输入 / T-069 GS5 SPZ 输出）使用。
构建
cd extern_build/alspz
uv build
依赖：CMake ≥3.15、Cython、numpy；zlib/zstd 缺失时经 FetchContent 自动下载 （需网络，代理环境变量 HTTPS_PROXY 生效）。
值约定（save_spz / load_spz = niantic GaussianCloud 空间）
不是 GSIR 线性空间，也不是 Cesium 最终显示值。完整链见仓库
docs/31_output_gs3dtiles.md
（wasm unpack 之后 JS 还要对 scale 做 exp、对 alpha 做 sigmoid）。
load_spz 还原的是本表，不要用「alphas ∈ [0,1]」当 Cesium 验收。
| 字段 | 约定 |
|---|---|
| scale | log（m 的自然对数）——wasm 还原 log，Cesium JS Math.exp 后才进协方差 |
| alpha | logit（sigmoid 前）——wasm invSigmoid 还原 logit，Cesium JS 再 sigmoid 后 ×255；传线性会把近 0 噪声抬到 ~0.5 |
| color | SH DC f_dc（禁止 0.5+C0·f_dc；pack 为 f_dc*0.15*255+127.5） |
| rot | 单位四元数 xyzw |
| sh | (系数, RGB) 交织 = 3DGS f_rest 顺序；degree 0/1/2/3/4 |
| 坐标 | UNSPECIFIED（无转换，约定处理在 Python 侧；对齐 CesiumJS GltfSpzLoader 的解码参数） |
注意事项
- 构建启用
SPZ_BUILD_EXTENSIONS（读第三方带坐标扩展的 spz 时可正确转换）。 - 绑定不按值返回任何 C++ struct（AGENTS.md §5.4.21 教训），全部指针传出。
1 maintainer
Metadata
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Release files for alspz 0.2.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| alspz-0.2.0.tar.gz | 50.8 kB | Without provenance | Details for alspz-0.2.0.tar.gz |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Actions Reset |
|---|---|---|---|---|
| alspz-0.2.0-cp311-cp311-win_amd64.whl | CPython 3.11 | CPython 3.11 | Windows x86-64 | Details for alspz-0.2.0-cp311-cp311-win_amd64.whl |
Total release size: 1.8 MB
Release files / alspz-0.2.0.tar.gz
| Download URL | alspz-0.2.0.tar.gz |
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| Download URL | alspz-0.2.0-cp311-cp311-win_amd64.whl |
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