stl-exporter/build/faceVertexMeshToBinaryStl.js

Convert face-vertex, or polygon meshes to ascii and binary STLs

// Generated by CoffeeScript 1.12.7
(function() {
  var writeStringToBufferView;

  writeStringToBufferView = require('./helpers/writeStringToBufferView');

  module.exports = function(model) {
    var a, attributeByteCountLength, buffer, bufferLength, contentLength, dataView, faceNormalCoordinates, faceVertexIndices, facetLength, facetsCounterLength, headerLength, headerView, i, j, k, le, name, offset, ref, vectorLength, vertexCoordinates;
    faceNormalCoordinates = model.faceNormalCoordinates, faceVertexIndices = model.faceVertexIndices, vertexCoordinates = model.vertexCoordinates, name = model.name;
    headerLength = 80;
    facetsCounterLength = 4;
    vectorLength = 12;
    attributeByteCountLength = 2;
    facetLength = vectorLength * 4 + attributeByteCountLength;
    contentLength = (faceVertexIndices.length / 3) * facetLength;
    bufferLength = headerLength + facetsCounterLength + contentLength;
    buffer = new ArrayBuffer(bufferLength);
    headerView = new DataView(buffer, 0, headerLength);
    dataView = new DataView(buffer, headerLength);
    le = true;
    writeStringToBufferView(name, headerView);
    dataView.setUint32(0, faceVertexIndices.length / 3, le);
    offset = facetsCounterLength;
    for (i = j = 0, ref = faceVertexIndices.length; j < ref; i = j += 3) {
      dataView.setFloat32(offset, faceNormalCoordinates[i], le);
      dataView.setFloat32(offset += 4, faceNormalCoordinates[i + 1], le);
      dataView.setFloat32(offset += 4, faceNormalCoordinates[i + 2], le);
      for (a = k = 0; k <= 2; a = ++k) {
        dataView.setFloat32(offset += 4, vertexCoordinates[faceVertexIndices[i + a] * 3], le);
        dataView.setFloat32(offset += 4, vertexCoordinates[faceVertexIndices[i + a] * 3 + 1], le);
        dataView.setFloat32(offset += 4, vertexCoordinates[faceVertexIndices[i + a] * 3 + 2], le);
      }
      dataView.setUint16(offset += 4, 0, le);
      offset += 2;
    }
    return buffer;
  };

}).call(this);