gistfile1.js

BlenderExport.tmpVec = vec4.create();
BlenderExport.tmpNo = vec4.create();
BlenderExport.rv = vec3.create();
BlenderExport.nrv = vec3.create();
BlenderExport.v = vec4.create();
BlenderExport.n = vec4.create();

BlenderExport.setFrame = function(frame) {
  if (!this.frameVertices)
    this.frameVertices = new Float32Array(this.vertices);
  if (!this.frameNormals)
    this.frameNormals = new Float32Array(this.normals);
  var tmpVec = BlenderExport.tmpVec;
  var tmpNo = BlenderExport.tmpNo;
  var rv = BlenderExport.rv;
  var nrv = BlenderExport.nrv;
  var v = BlenderExport.v; 
  var n = BlenderExport.n;
  if (!this.boneMatrices)
    this.boneMatrices = [];
  var boneMatrices = this.boneMatrices;
  for (var i=0; i<this.vertexGroups.length; i++) {
    var vg = this.vertexGroups[i];
    boneMatrices[i] = this.bones[vg][frame];
  }
  for (var i=0; i<this.weights.length; i++) {
    var wt = this.weights[i];
    v[0] = this.vertices[i*3+0];
    v[1] = this.vertices[i*3+1];
    v[2] = this.vertices[i*3+2];
    v[3] = 1;
    n[0] = this.normals[i*3+0];
    n[1] = this.normals[i*3+1];
    n[2] = this.normals[i*3+2];
    n[3] = 0;
    rv[0] = rv[1] = rv[2] = 0;
    nrv[0] = nrv[1] = nrv[2] = 0;
    var totalWeight = 0;
    if (wt.length == 0) {
      totalWeight = 1;
      vec3.setLeft(rv, v);
      vec3.setLeft(nrv, n);
    }
    for (var j=0; j<wt.length; j++) {
      var boneIndex = wt[j][0];
      var weight = wt[j][1];
      totalWeight += weight;
      var mat = boneMatrices[boneIndex];
      if (!mat) continue;
      mat4.multiplyVec4(mat, v, tmpVec);
      mat4.multiplyVec4(mat, n, tmpNo);
      vec3.scale(tmpVec, weight, tmpVec);
      vec3.add(rv, tmpVec, rv);
      vec3.scale(tmpNo, weight, tmpNo);
      vec3.add(nrv, tmpNo, nrv);
    }
    vec3.scale(rv, 1/totalWeight);
    vec3.scale(nrv, 1/totalWeight);
    this.frameVertices[i*3+0] = rv[0];
    this.frameVertices[i*3+1] = rv[1];
    this.frameVertices[i*3+2] = rv[2];
    this.frameNormals[i*3+0] = nrv[0];
    this.frameNormals[i*3+1] = nrv[1];
    this.frameNormals[i*3+2] = nrv[2];
  }
};