Wasm-stl-thumbnailer NPM

About

Generates a PNG render from an STL file. 2-3x faster than Three.js for first render due to GPU pre-initilization, 10-20% faster for future renders. Built with Web Assembly and WebGPU.

Added support for OBJ models

Demo

https://adamgerhant.github.io/wasm-stl-thumbnailer

Example

import { useEffect, useState} from 'react'
import init, * as wasm from "wasm-stl-thumbnailer"

const App = () => {

    //initialize Web Assembly
    useEffect(()=>{
        init()
    },[])

    const handleFileChange = async (event) => {
        const file = event.target.files[0];
        if (file) {
            try {
                //convert file to byte stream
                const arrayBuffer = await file.arrayBuffer();
                const uint8Array = new Uint8Array(arrayBuffer);

                //get png byte stream from stl byte stream
                const pngByteStream = await wasm.stl_to_png(uint8Array);

                //add image to document
                const blob = new Blob([pngByteStream], { type: 'image/png' });
                const dataUrl = URL.createObjectURL(blob);
                const img = document.createElement('img');
                img.src =dataUrl;
                document.body.appendChild(img);
            
            } catch (error) {
                console.error('Error reading file:', error.message);
            }
        }
    }
  
    return(
        <input type="file" onChange={handleFileChange}/>      
    )
}

export default App

Example Render

render7

Performance

Performance was tested with the demo site, which compares the wasm-stl-thumbnailer to the react-stl-viewer. Various file sizes were tested, and the time is an average of 5 first renders. The full data is available on this Google Sheet

optimized bar chart optimized percent decrease