fix: excessive particle emitted on move ParticleSystem for local spac…

…e simulation and emission over distance

close #265

Scripts/UIParticleRenderer.cs

@@ -580,23 +580,28 @@ private void Simulate(Vector3 scale, bool paused)
  */
 
  // get world position.
+ var isLocalSpace = _particleSystem.IsLocalSpace();
  var psTransform = _particleSystem.transform;
  var originWorldPosition = psTransform.position;
  var originWorldRotation = psTransform.rotation;
  var emission = _particleSystem.emission;
  var rateOverDistance = emission.enabled
  && 0 < emission.rateOverDistance.constant
  && 0 < emission.rateOverDistanceMultiplier;
- if (rateOverDistance)
+ if (rateOverDistance && !paused)
  {
  // (For rate-over-distance emission,) Move to previous scaled position, simulate (delta = 0).
- var prevScaledPos = _prevPsPos.GetScaled(_prevScale.Inverse());
+ var prevScaledPos = isLocalSpace
+ ? _prevPsPos
+ : _prevPsPos.GetScaled(_prevScale.Inverse());
  psTransform.SetPositionAndRotation(prevScaledPos, originWorldRotation);
  _particleSystem.Simulate(0, false, false, false);
  }
 
  // Move to scaled position, simulate, revert to origin position.
- var scaledPos = originWorldPosition.GetScaled(scale.Inverse());
+ var scaledPos = isLocalSpace
+ ? originWorldPosition
+ : originWorldPosition.GetScaled(scale.Inverse());
  psTransform.SetPositionAndRotation(scaledPos, originWorldRotation);
  _particleSystem.Simulate(deltaTime, false, false, false);
  psTransform.SetPositionAndRotation(originWorldPosition, originWorldRotation);