OutPortal.cs

using UnityEngine;
using System.Collections;

public class OutPortal : MonoBehaviour {
	public float rotateSpeed;
	private Vector3 rotateZ;
	public bool hitP = false;
	private int counter = 0;
	private ParticleSystem particles;
	
	void Start() {
		particles = GetComponent<ParticleSystem> ();
	}
	
	void OnTriggerEnter(Collider other) {
		if (other.tag=="Player"){
			hitP=true;
			particles.emissionRate *= 3;
			rotateSpeed *= 3;
		}
	}
	
	void Update () {
		counter ++;
		
		if (counter == 50){ counter = 0;}
		int colorpick = counter%10;
		if (hitP){
			switch (colorpick) {
				
			case 0:
				particles.startColor = new Color(0.9f, 0.3f, 0.3f);
				break;
			case 1:
				particles.startColor = new Color(0.9f, 0.9f, 0.3f);
				break;
			case 2:
				particles.startColor = new Color(0.3f, 0.9f, .3f);
				break;
			case 3:
				particles.startColor = new Color(0.3f, 0.9f, 0.9f);
				break;
			case 4:
				particles.startColor = new Color(0.3f, 0.3f, 0.9f);
				break;
			case 5:
				particles.startColor = new Color(0.9f, 0.3f, 0.9f);
				break;
			}
		}
		rotateZ.z = rotateSpeed;
		transform.Rotate(rotateZ, Space.World);
	}
}