SPZ to Splat Converter

Many custom WebGL 3D Gaussian shaders and open-source Three.js Gaussian viewers are designed to read the straightforward 32-byte linear .splat structure.

When you capture a scene with Niantic Scaniverse (which outputs .spz), converting it directly to .splat unpacks the compressed streams into standard 32-byte splat blocks ready for direct GPU vertex buffer binding.

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Direct GPU Stream Conversion

[Niantic SPZ Archive]
       │
       ├── Inflate Deflate Stream
       ├── Expand Positions (X, Y, Z Float32)
       ├── Unpack Scales & Quaternions
       └── Interleave into 32-Byte Packed Blocks
       │
       ▼
[.splat Array (Ready for Direct GPU Buffer Upload)]

Output Channel	Byte Offset	Type	Description
Position	0..11	Float32 $\times 3$	Center coordinate $x, y, z$
Scale	12..23	Float32 $\times 3$	Ellipsoid radii $s_0, s_1, s_2$
Color & Alpha	24..27	UInt8 $\times 4$	RGBA color values
Rotation	28..31	UInt8 $\times 4$	Normalized quaternion values

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Conversion Steps

1. Drag your .spz file into the upload zone.
2. Select SPLAT target format.
3. Click Convert & Download .SPLAT for immediate use in your custom WebGL shaders.