code: function multiplyScalar(out, a, b) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
    out[2] = a[2] * b;
    out[3] = a[3] * b;
    out[4] = a[4] * b;
    out[5] = a[5] * b;
    out[6] = a[6] * b;
    out[7] = a[7] * b;
    out[8] = a[8] * b;
    return out;
  }
docs: Multiply each element of the matrix by a scalar.
  
  @param {mat3} out the receiving matrix
  @param {mat3} a the matrix to scale
  @param {Number} b amount to scale the matrix's elements by
  @returns {mat3} out