copyInverse method

Implementation

double copyInverse(Matrix3 arg) {
  final double det = arg.determinant();
  if (det == 0.0) {
    setFrom(arg);
    return 0.0;
  }
  final double invDet = 1.0 / det;
  final Float32List argStorage = arg._m3storage;
  final double ix = invDet *
      (argStorage[4] * argStorage[8] - argStorage[5] * argStorage[7]);
  final double iy = invDet *
      (argStorage[2] * argStorage[7] - argStorage[1] * argStorage[8]);
  final double iz = invDet *
      (argStorage[1] * argStorage[5] - argStorage[2] * argStorage[4]);
  final double jx = invDet *
      (argStorage[5] * argStorage[6] - argStorage[3] * argStorage[8]);
  final double jy = invDet *
      (argStorage[0] * argStorage[8] - argStorage[2] * argStorage[6]);
  final double jz = invDet *
      (argStorage[2] * argStorage[3] - argStorage[0] * argStorage[5]);
  final double kx = invDet *
      (argStorage[3] * argStorage[7] - argStorage[4] * argStorage[6]);
  final double ky = invDet *
      (argStorage[1] * argStorage[6] - argStorage[0] * argStorage[7]);
  final double kz = invDet *
      (argStorage[0] * argStorage[4] - argStorage[1] * argStorage[3]);
  _m3storage[0] = ix;
  _m3storage[1] = iy;
  _m3storage[2] = iz;
  _m3storage[3] = jx;
  _m3storage[4] = jy;
  _m3storage[5] = jz;
  _m3storage[6] = kx;
  _m3storage[7] = ky;
  _m3storage[8] = kz;
  return det;
}