Show HN: WebGPU FTW with Splat-Transform

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SplatTransform is an open source CLI tool for converting and editing Gaussian splats. It can:

📥 Read PLY, Compressed PLY, SPLAT, KSPLAT, SPZ formats
📤 Write PLY, Compressed PLY, CSV, SOG and HTML viewer formats
🔗 Merge multiple splats
🔄 Apply transformations to input splats
🎛️ Filter out Gaussians or spherical harmonic bands

Install or update to the latest version:

npm install -g @playcanvas/splat-transform

splat-transform [GLOBAL] <input.{ply|compressed.ply|splat|ksplat}> [ACTIONS] ... <output.{ply|compressed.ply|sog|meta.json|csv|html}> [ACTIONS]

Key points:

Every time an *.ply* appears, it becomes the current working set; the following ACTIONS are applied in the order listed
The last file on the command line is treated as the output; anything after it is interpreted as actions that modify the final result

Format Input Output Description

.ply	✅	✅	Standard PLY format
.compressed.ply	✅	✅	Compressed PLY format (auto-detected and decompressed on read)
.ksplat	✅	❌	Compressed splat format (mkkellogg format)
.splat	✅	❌	Compressed splat format (antimatter15 format)
.spz	✅	❌	Compressed splat format (Niantic format)
.mjs	✅	❌	Generate a scene using an mjs script (Beta)
.sog	❌	✅	Bundled super-compressed format (recommended)
meta.json	❌	✅	Unbundled super-compressed format (also outputs .webp images)
.csv	❌	✅	Comma-separated values spreadsheet
.html	❌	✅	Standalone HTML viewer app

Actions can be repeated and applied in any order:

-t, --translate x,y,z Translate splats by (x, y, z) -r, --rotate x,y,z Rotate splats by Euler angles (deg) -s, --scale x Uniformly scale splats by factor x -n, --filterNaN Remove any Gaussian containing NaN/Inf -c, --filterByValue name,cmp,value Keep splats where <name> <cmp> <value> cmp ∈ {lt,lte,gt,gte,eq,neq} -b, --filterBands {0|1|2|3} Strip spherical-harmonic bands > N -P, --params name=value[,name=value...] Pass parameters to .mjs generator script

-w, --overwrite Overwrite output file if it already exists -h, --help Show help and exit -v, --version Show version and exit -g, --no-gpu Disable gpu when compressing spherical harmonics. -i, --iterations <number> Specify the number of iterations when compressing spherical harmonics. More iterations generally lead to better results. Default is 10. -p, --cameraPos Specify the viewer starting position. Default is 2,2,-2. -e, --cameraTarget Specify the viewer starting target. Default is 0,0,0.

# Simple format conversion splat-transform input.ply output.csv # Convert from .splat format splat-transform input.splat output.ply # Convert from .ksplat format splat-transform input.ksplat output.ply # Convert to compressed PLY splat-transform input.ply output.compressed.ply # Uncompress a compressed PLY back to standard PLY # (compressed .ply is detected automatically on read) splat-transform input.compressed.ply output.ply # Convert to SOG bundled format splat-transform input.ply output.sog # Convert to SOG unbundled format splat-transform input.ply output/meta.json # Convert to HTML viewer with target and camera location splat-transform -a 0,0,0 -e 0,0,10 input.ply output.html

# Scale and translate splat-transform bunny.ply -s 0.5 -t 0,0,10 bunny_scaled.ply # Rotate by 90 degrees around Y axis splat-transform input.ply -r 0,90,0 output.ply # Chain multiple transformations splat-transform input.ply -s 2 -t 1,0,0 -r 0,0,45 output.ply

# Remove entries containing NaN and Inf splat-transform input.ply --filterNaN output.ply # Filter by opacity values (keep only splats with opacity > 0.5) splat-transform input.ply -c opacity,gt,0.5 output.ply # Strip spherical harmonic bands higher than 2 splat-transform input.ply --filterBands 2 output.ply

# Combine multiple files with different transforms splat-transform -w cloudA.ply -r 0,90,0 cloudB.ply -s 2 merged.compressed.ply # Apply final transformations to combined result splat-transform input1.ply input2.ply output.ply -p 0,0,10 -e 0.5

Generator scripts can be used to synthesize gaussian splat data. See gen-grid.mjs for an example.

splat-transform gen-grid.mjs -P width=10,height=10,scale=10,color=0.1 scenes/grid.ply -w

# Show version splat-transform --version # Show help splat-transform --help

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