This selects the space in which to simulate particles. It can be either world or local space.
using UnityEngine;
public class Example : MonoBehaviour { ParticleSystem part; bool useLocal = true;
void Start() { part = GetComponent<ParticleSystem> (); useLocal = (part.simulationSpace == ParticleSystemSimulationSpace.Local); }
void Update() { part.simulationSpace = (useLocal ? ParticleSystemSimulationSpace.Local : ParticleSystemSimulationSpace.World); }
void OnGUI() { useLocal = GUI.Toggle(new Rect(10, 60, 200, 30), useLocal, " Use Local Simulation Space"); } }