message: tweaked getOperators
diff: @@ -90,9 +90,28 @@ namespace StructureSymmetry {
  }
  function getOperators(symmetry: ModelSymmetry, ijkMin: Vec3, ijkMax: Vec3) {
  + const operators: SymmetryOperator[] = [];
  + const { spacegroup } = symmetry;
  + if (operators.length === 0) {
  + for (let op = 0; op < spacegroup.operators.length; op++) {
  + for (let i = ijkMin[0]; i < ijkMax[0]; i++) {
  + for (let j = ijkMin[1]; j < ijkMax[1]; j++) {
  + for (let k = ijkMin[2]; k < ijkMax[2]; k++) {
  + operators[operators.length] = Spacegroup.getSymmetryOperator(spacegroup, op, i, j, k);
  + }
  + }
  + }
  + }
  + }
  + return operators;
  +}
  +
  +function getOperatorsCached333(symmetry: ModelSymmetry) {
  const operators: SymmetryOperator[] = symmetry._operators_333 || [];
  const { spacegroup } = symmetry;
  if (operators.length === 0) {
  + const ijkMin = Vec3.create(-3, -3, -3)
  + const ijkMax = Vec3.create(3, 3, 3)
  operators[0] = Spacegroup.getSymmetryOperator(spacegroup, 0, 0, 0, 0)
  for (let op = 0; op < spacegroup.operators.length; op++) {
  for (let i = ijkMin[0]; i < ijkMax[0]; i++) {
  @@ -150,7 +169,7 @@ async function findMatesRadius(ctx: RuntimeContext, structure: Structure, radius
  if (SpacegroupCell.isZero(spacegroup.cell)) return structure;
  if (ctx.shouldUpdate) await ctx.update('Initialing...');
  - const operators = getOperators(symmetry, Vec3.create(-3, -3, -3), Vec3.create(3, 3, 3));
  + const operators = getOperatorsCached333(symmetry);
  const lookup = structure.lookup3d;
  const assembler = Structure.Builder();
  