Create a cube.usdz of any size in the browser!

create-usdz.js

function createUSDZ(length, width, height) {
    // Bytes corresponding to a 1m x 1m x 1m cube
    const bytes = [80,75,3,4,10,0,0,0,0,0,121,71,202,80,241,6,140,202,131,11,0,0,131,11,0,0,10,0,24,0,99,117,98,101,50,46,117,115,100,99,134,25,20,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,80,88,82,45,85,83,68,67,0,7,0,0,0,0,0,0,187,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,4,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,0,0,0,1,0,0,0,0,0,10,64,1,0,0,0,0,0,0,0,2,0,0,0,8,0,0,0,0,0,0,0,3,0,0,0,0,0,10,64,2,0,0,0,0,0,0,0,17,0,0,0,18,0,0,0,3,0,0,0,0,0,0,0,20,0,0,0,21,0,0,0,22,0,0,0,3,0,0,0,0,0,0,0,24,0,0,0,25,0,0,0,26,0,0,0,10,0,0,0,0,0,0,0,28,0,0,0,29,0,0,0,30,0,0,0,31,0,0,0,32,0,0,0,33,0,0,0,34,0,0,0,35,0,0,0,36,0,0,0,25,0,0,0,1,0,0,0,0,0,0,0,37,0,0,0,1,0,0,0,0,0,0,0,38,0,0,0,1,0,0,0,0,0,0,0,39,0,0,0,4,0,0,0,0,0,0,0,41,0,0,0,39,0,0,0,42,0,0,0,43,0,0,0,12,0,0,0,0,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,3,0,0,0,36,0,0,0,0,0,0,0,25,0,0,0,0,0,0,0,0,114,254,255,255,255,21,81,17,3,0,90,0,1,1,3,3,4,0,80,3,3,1,1,3,205,204,76,63,205,204,76,63,205,204,76,63,3,1,0,0,0,0,0,0,0,7,0,0,0,3,1,0,0,0,0,0,0,0,16,0,0,0,0,24,0,0,0,0,0,0,0,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,63,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,191,0,0,0,63,0,0,0,63,0,0,0,191,24,0,0,0,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,128,0,0,0,0,0,0,128,191,0,0,0,128,0,0,0,0,0,0,128,191,0,0,0,128,0,0,0,0,0,0,128,191,0,0,0,128,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,0,0,0,0,0,0,0,0,0,0,128,191,24,0,0,0,0,0,0,0,0,0,32,63,0,0,128,62,0,0,192,62,0,0,0,0,0,0,32,63,0,0,0,0,0,0,192,62,0,0,128,62,0,0,32,63,0,0,128,62,0,0,192,62,0,0,0,63,0,0,192,62,0,0,128,62,0,0,32,63,0,0,0,63,0,0,32,63,0,0,0,63,0,0,192,62,0,0,64,63,0,0,192,62,0,0,0,63,0,0,32,63,0,0,64,63,0,0,32,63,0,0,128,63,0,0,192,62,0,0,64,63,0,0,32,63,0,0,64,63,0,0,192,62,0,0,128,63,0,0,192,62,0,0,0,63,0,0,0,62,0,0,64,63,0,0,0,62,0,0,0,63,0,0,192,62,0,0,64,63,0,0,96,63,0,0,0,63,0,0,32,63,0,0,64,63,0,0,32,63,0,0,0,63,0,0,96,63,0,0,64,63,9,146,247,62,111,122,172,62,102,182,85,190,183,205,71,63,50,34,45,62,96,129,65,63,12,90,139,190,158,41,18,63,154,153,217,63,154,153,217,63,154,153,217,63,0,0,0,64,129,111,29,64,0,0,0,0,79,213,19,64,0,0,0,128,2,180,27,64,0,0,0,64,19,78,16,64,0,0,0,0,142,157,23,64,0,0,0,224,86,22,240,191,0,0,0,0,2,0,0,0,0,0,0,0,24,0,0,0,26,0,0,0,1,0,0,0,0,0,0,0,36,0,0,0,64,0,0,0,0,0,0,0,157,2,0,0,0,0,0,0,67,2,0,0,0,0,0,0,0,244,211,0,117,112,65,120,105,115,0,89,0,112,114,105,109,67,104,105,108,100,114,101,110,0,99,117,98,101,50,0,100,101,102,97,117,108,116,80,114,105,109,0,109,101,116,101,114,115,80,101,114,85,110,105,116,0,99,117,115,116,111,109,76,97,121,101,114,68,97,116,97,0,99,114,101,97,116,111,114,0,117,115,100,122,99,111,110,118,101,114,116,32,112,114,101,118,105,101,119,32,48,46,54,50,0,115,112,101,99,105,102,105,101,114,0,116,121,112,101,78,97,109,101,0,88,102,111,114,109,0,97,115,115,101,116,73,110,102,111,0,110,97,109,101,0,107,105,110,100,0,99,111,109,112,111,110,101,110,116,0,77,97,116,101,114,105,97,108,115,0,71,101,111,109,0,83,99,111,112,101,0,67,117,98,101,0,76,105,103,104,116,0,67,97,109,101,114,97,0,112,114,111,112,101,114,116,105,101,115,0,120,102,111,114,109,79,112,58,116,114,97,110,115,108,97,116,101,18,0,84,79,114,100,101,114,13,0,65,58,111,114,105,96,0,161,101,115,104,0,112,111,105,110,116,115,1,1,118,118,97,114,115,58,115,116,12,0,248,9,110,111,114,109,97,108,115,0,102,97,99,101,86,101,114,116,101,120,73,110,100,105,99,101,18,0,48,67,111,117,64,0,243,4,115,117,98,100,105,118,105,115,105,111,110,83,99,104,101,109,101,0,109,190,0,245,5,58,98,105,110,100,105,110,103,0,100,111,117,98,108,101,83,105,100,101,100,138,0,85,115,99,97,108,101,233,0,64,0,115,117,114,108,0,48,83,104,97,175,0,131,111,117,116,112,117,116,115,58,22,0,19,0,23,0,161,105,110,102,111,58,105,100,0,105,110,30,0,176,100,105,102,102,117,115,101,67,111,108,111,28,0,1,20,0,244,11,114,111,117,103,104,110,101,115,115,0,98,111,111,108,0,118,97,114,105,97,98,1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   
    // Offset where the x, y, z scale properties are set
    const byteOffset = 1344;

    // Create a buffer & data view to read / write to it
    let buffer = new ArrayBuffer(bytes.length);
    let view = new DataView(buffer);

    // Populate the buffer with the usdz bytes
    bytes.forEach((b,i) => {
      view.setUint8(i, b);
    });

    // Set the scale for the x, y, z axis
    view.setFloat32(byteOffset, length, true);
    view.setFloat32(byteOffset + 4, width, true);
    view.setFloat32(byteOffset + 8, height, true);

    return arrayBufferToBase64(buffer);
}

function arrayBufferToBase64(buffer) {
    let binary = '';
    let bytes = new Uint8Array(buffer);
    let len = bytes.byteLength;
    for (let i = 0; i < len; i++) {
        binary += String.fromCharCode(bytes[i]);
    }
    return window.btoa(binary);
}

function launchQuickLook(length, width, height) {
  let usdz = createUSDZ(length, width, height);
  let link = document.createElement("a");
  link.appendChild(document.createElement('img'));
  link.rel = "ar";
  link.download = "cube.usdz";
  link.href = "data:model/usd;base64," + usdz;
  link.click();
}

// Example usage
launchQuickLook(1,2,1);