Particle Playground - Switch world object

using UnityEngine;
using System.Collections;
using ParticlePlayground;

public class SwitchWorldObject : MonoBehaviour {

    public PlaygroundParticlesC particles;      // Reference to your particle system
    public GameObject[] worldObjects;           // Assign your world objects (needs a mesh)

    int current;

    void Update () {
        if (Input.GetMouseButtonDown (0)) {
            StartCoroutine(Switch());
        }
    }

    IEnumerator Switch () {
        if (worldObjects.Length==0) yield break;
        current = (current+1)%worldObjects.Length;

        // Update the current computed world object
        particles.worldObject.gameObject = worldObjects[current];

        // The new world object will be available next frame
        yield return null;

        // Set particle count to match the vertex amount
        particles.particleCount = particles.worldObject.vertexPositions.Length;
    }
}