addScaledSH method
Implementation
SphericalHarmonics3 addScaledSH(SphericalHarmonics3 sh, num s) {
  for (var i = 0; i < 9; i++) {
    coefficients[i].addScaledVector(sh.coefficients[i], s);
  }
  return this;
}SphericalHarmonics3 addScaledSH(SphericalHarmonics3 sh, num s) {
  for (var i = 0; i < 9; i++) {
    coefficients[i].addScaledVector(sh.coefficients[i], s);
  }
  return this;
}